1. General description
The 74HC257; 74HCT257 is a high-speed Si-gate CMOS device and is pin compatible
with Low-power Schottky TTL (LSTTL).
The 74HC257; 74HCT257 has four identical 2-input multiplexers with 3-state outputs,
which select 4 bits of data from two sources and are controlled by a common data select
input (S).
The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data
inputs from source 1 (1I1 to 4I1) are selected when S is HIGH. Data appears at the
outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.
The 74HC257; 74HCT257 is the logic implementation of a 4-pole, 2-position switch,
where the position of the switch is determined by the logic levels applied to S. The outputs
are forced to a high-impedance OFF-state when OE is HIGH.
The logic equations for the outputs are:
The 74HC257; 74HCT257 is identical to the 74HC258 but has non-inverting (true)
outputs.
2. Features
■Non-inverting data path
■3-state outputs interface directly with system bus
■Complies with JEDEC standard no. 7A
■ESD protection:
◆HBM EIA/JESD22-A114-C exceeds 2000 V
◆MM EIA/JESD22-A115-A exceeds 200 V
■Multiple package options
■Specified from −40 °Cto+85°C and from −40 °C to +125 °C
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Rev. 03 — 20 September 2005 Product data sheet
1Y OE 1I1 S×1I0+S×()×=
2Y OE 2I1 S×2I0+S×()×=
3Y OE 3I1 S×3I0+S×()×=
4Y OE 4I1 S×4I0+S×()×=
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 2 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
3. Quick reference data
[1] CPD is used to determine the dynamic power dissipation (PD in µW).
PD=C
PD ×VCC2×fi×N+∑(CL×VCC2×fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑(CL×VCC2×fo) = sum of outputs.
4. Ordering information
Table 1: Quick reference data
GND = 0 V; T
amb
=25
°
C; t
r
=t
f
= 6 ns.
Symbol Parameter Conditions Min Typ Max Unit
74HC257
tPHL, tPLH propagation delay
nI0, nI1 to nY CL= 15 pF;
VCC =5 V -11-ns
propagation delay S to nY CL= 15 pF;
VCC =5 V -14-ns
Ciinput capacitance - 3.5 - pF
CPD power dissipation
capacitance (per multiplexer) VI= GND to VCC [1] -45-pF
74HCT257
tPHL, tPLH propagation delay
nI0, nI1 to nY CL= 15 pF;
VCC =5 V -13-ns
propagation delay S to nY CL= 15 pF;
VCC =5 V -17-ns
Ciinput capacitance - 3.5 - pF
CPD power dissipation
capacitance (per multiplexer) VI= GND to
VCC −1.5 V [1] -45-pF
Table 2: Ordering information
Type number Package
Temperature range Name Description Version
74HC257N −40 °C to +125 °C DIP16 plastic dual in-line package; 16
leads (300 mil); long body SOT38-1
74HC257D −40 °C to +125 °C SO16 plastic small outline package; 16
leads; body width 3.9 mm SOT109-1
74HC257DB −40 °C to +125 °C SSOP16 plastic shrink small outline
package; 16 leads; body width
5.3 mm
SOT338-1
74HC257PW −40 °C to +125 °C TSSOP16 plastic thin shrink small outline
package; 16 leads; body width
4.4 mm
SOT403-1
74HCT257N −40 °C to +125 °C DIP16 plastic dual in-line package; 16
leads (300 mil); long body SOT38-1
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 3 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
5. Functional diagram
74HCT257D −40 °C to +125 °C SO16 plastic small outline package; 16
leads; body width 3.9 mm SOT109-1
74HCT257DB −40 °C to +125 °C SSOP16 plastic shrink small outline
package; 16 leads; body width
5.3 mm
SOT338-1
74HCT257PW −40 °C to +125 °C TSSOP16 plastic thin shrink small outline
package; 16 leads; body width
4.4 mm
SOT403-1
Table 2: Ordering information
…continued
Type number Package
Temperature range Name Description Version
Fig 1. Logic symbol Fig 2. IEC logic symbol
Fig 3. Functional diagram
mga835
S
OE
1Y
2Y
3Y
4Y
2
3
5
6
11
10
14
13
15
1
4
7
9
12
1I0
1I1
2I0
2I1
3I0
3I1
4I0
4I1
001aad467
15
1G1
1MUX
1
4
2
3
7
5
6
9
11
10
12
14
13
EN
mgr280
S1
1I0
2
1Y
4
1I1
3
SELECTOR
3-STATE MULTIPLEXER OUTPUTS
2I0
5
2Y
7
2I1
63I0
11
3Y
9
3I1
10 4I0
14
4Y
12
4I1
13
OE
15
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 4 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
6. Pinning information
6.1 Pinning
Fig 4. Logic diagram
001aad468
1Y
S
OE
1I0
1I1
2I0
2I1
3I0
3I1
4I0
4I1
2Y
3Y
4Y
Fig 5. Pin configuration DIP16, SO16, SSOP16 and TSSOP16
257
SVCC
1I0 OE
1I1 4I0
1Y 4I1
2I0 4Y
2I1 3I0
2Y 3I1
GND 3Y
001aad499
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 5 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
6.2 Pin description
7. Functional description
7.1 Function table
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
Table 3: Pin description
Symbol Pin Description
S 1 common data select input
1I0 2 data input 1 from source 0
1I1 3 data input 1 from source 1
1Y 4 3-state multiplexer output 1
2I0 5 data input 2 from source 0
2I1 6 data input 2 from source 1
2Y 7 3-state multiplexer output 2
GND 8 ground (0 V)
3Y 9 3-state multiplexer output 3
3I1 10 data input 3 from source 1
3I0 11 data input 3 from source 0
4Y 12 3-state multiplexer output 4
4I1 13 data input 4 from source 1
4I0 14 data input 4 from source 0
OE 15 3-state output enable input (active LOW)
VCC 16 supply voltage
Table 4: Function table[1]
Control Input Output
OE S nl0 nl1 nY
HXXXZ
LHXLL
XHH
LLXL
HXH
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 6 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
8. Limiting values
[1] For DIP16 packages: above 70 °C, Ptot derates linearly with 12 mW/K.
[2] For SO16 packages: above 70 °C, Ptot derates linearly with 8 mW/K.
[3] For SSOP16 and TSSOP16 packages: above 60 °C, Ptot derates linearly with 5.5 mW/K.
9. Recommended operating conditions
Table 5: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
VCC supply voltage −0.5 +7 V
IIK input clamping current VI < −0.5 V or VI>V
CC + 0.5 V - ±20 mA
IOK output clamping current VO<−0.5 V or
VO>V
CC + 0.5 V -±20 mA
IOoutput current VO = −0.5 V to VCC + 0.5 V - ±35 mA
ICC quiescent supply current - +70 mA
IGND ground current - −70 mA
Tstg storage temperature −65 +150 °C
Ptot total power dissipation
DIP16 package [1] - 750 mW
SO16 package [2] - 500 mW
SSOP16 package [3] - 500 mW
TSSOP16 package [3] - 500 mW
Table 6: Recommended operating conditions
Symbol Parameter Conditions Min Typ Max Unit
Type 74HC257
VCC supply voltage 2.0 5.0 6.0 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
tr, tfinput rise and fall
times VCC = 2.0 V - - 1000 ns
VCC = 4.5 V - 6.0 500 ns
VCC = 6.0 V - - 400 ns
Tamb ambient temperature −40 - +125 °C
Type 74HCT257
VCC supply voltage 4.5 5.0 5.5 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
tr, tfinput rise and fall
times VCC = 4.5 V - 6.0 500 ns
Tamb ambient temperature −40 - +125 °C
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 7 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
10. Static characteristics
Table 7: Static characteristics type 74HC257
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
Tamb =25°C
VIH HIGH-state input voltage VCC = 2.0 V 1.5 1.2 - V
VCC = 4.5 V 3.15 2.4 - V
VCC = 6.0 V 4.2 3.2 - V
VIL LOW-state input voltage VCC = 2.0 V - 0.8 0.5 V
VCC = 4.5 V - 2.1 1.35 V
VCC = 6.0 V - 2.8 1.8 V
VOH HIGH-state output voltage VI=V
IH or VIL
IO=−20 µA; VCC = 2.0 V 1.9 2.0 - V
IO=−20 µA; VCC = 4.5 V 4.4 4.5 - V
IO=−20 µA; VCC = 6.0 V 5.9 6.0 - V
IO=−6.0 mA; VCC = 4.5 V 3.98 4.32 - V
IO=−7.8 mA; VCC = 6.0 V 5.48 5.81 - V
VOL LOW-state output voltage VI=V
IH or VIL
IO=20µA; VCC = 2.0 V - 0 0.1 V
IO=20µA; VCC = 4.5 V - 0 0.1 V
IO=20µA; VCC = 6.0 V - 0 0.1 V
IO= 6.0 mA; VCC = 4.5 V - 0.15 0.26 V
IO= 7.8 mA; VCC = 6.0 V - 0.16 0.26 V
ILI input leakage current VI=V
CC or GND; VCC = 6.0 V - - ±0.1 µA
IOZ OFF-state output current VI=V
IH or VIL; VO=V
CC or GND; VCC = 6.0 V - - ±0.5 µA
ICC quiescent supply current VI=V
CC or GND; IO= 0 A; VCC = 6.0 V - - 8.0 µA
Ciinput capacitance - 3.5 - pF
Tamb =−40 °C to +85 °C
VIH HIGH-state input voltage VCC = 2.0 V 1.5 - - V
VCC = 4.5 V 3.15 - - V
VCC = 6.0 V 4.2 - - V
VIL LOW-state input voltage VCC = 2.0 V - - 0.5 V
VCC = 4.5 V - - 1.35 V
VCC = 6.0 V - - 1.8 V
VOH HIGH-state output voltage VI=V
IH or VIL
IO=−20 µA; VCC = 2.0 V 1.9 - - V
IO=−20 µA; VCC = 4.5 V 4.4 - - V
IO=−20 µA; VCC = 6.0 V 5.9 - - V
IO=−6.0 mA; VCC = 4.5 V 3.84 - - V
IO=−7.8 mA; VCC = 6.0 V 5.34 - - V
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 8 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
VOL LOW-state output voltage VI=V
IH or VIL
IO=20µA; VCC = 2.0 V - - 0.1 V
IO=20µA; VCC = 4.5 V - - 0.1 V
IO=20µA; VCC = 6.0 V - - 0.1 V
IO= 6.0 mA; VCC = 4.5 V - - 0.33 V
IO= 7.8 mA; VCC = 6.0 V - - 0.33 V
ILI input leakage current VI=V
CC or GND; VCC = 6.0 V - - ±1.0 µA
IOZ OFF-state output current VI=V
IH or VIL; VO=V
CC or GND; VCC = 6.0 V - - ±5.0 µA
ICC quiescent supply current VI=V
CC or GND; IO= 0 A; VCC = 6.0 V - - 80 µA
Tamb =−40 °C to +125 °C
VIH HIGH-state input voltage VCC = 2.0 V 1.5 - - V
VCC = 4.5 V 3.15 - - V
VCC = 6.0 V 4.2 - - V
VIL LOW-state input voltage VCC = 2.0 V - - 0.5 V
VCC = 4.5 V - - 1.35 V
VCC = 6.0 V - - 1.8 V
VOH HIGH-state output voltage VI=V
IH or VIL -
IO=−20 µA; VCC = 2.0 V 1.9 - - V
IO=−20 µA; VCC = 4.5 V 4.4 - - V
IO=−20 µA; VCC = 6.0 V 5.9 - - V
IO=−6.0 mA; VCC = 4.5 V 3.7 - - V
IO=−7.8 mA; VCC = 6.0 V 5.2 - - V
VOL LOW-state output voltage VI=V
IH or VIL -
IO=20µA; VCC = 2.0 V - - 0.1 V
IO=20µA; VCC = 4.5 V - - 0.1 V
IO=20µA; VCC = 6.0 V - - 0.1 V
IO= 6.0 mA; VCC = 4.5 V - - 0.4 V
IO= 7.8 mA; VCC = 6.0 V - - 0.4 V
ILI input leakage current VI=V
CC or GND; VCC = 6.0 V - - ±1.0 µA
IOZ OFF-state output current VI=V
IH or VIL; VO=V
CC or GND; VCC = 6.0 V - - ±10.0 µA
ICC quiescent supply current VI=V
CC or GND; IO= 0 A; VCC = 6.0 V - - 160 µA
Table 7: Static characteristics type 74HC257
…continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
Table 8: Static characteristics type 74HCT257
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
Tamb =25°C
VIH HIGH-state input voltage VCC = 4.5 V to 5.5 V 2.0 1.6 - V
VIL LOW-state input voltage VCC = 4.5 V to 5.5 V - 1.2 0.8 V
VOH HIGH-state output voltage VI=V
IH or VIL; VCC = 4.5 V
IO=−20 µA 4.4 4.5 - V
IO=−6 mA 3.98 4.32 - V
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 9 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
VOL LOW-state output voltage VI=V
IH or VIL; VCC = 4.5 V
IO=20µA - 0 0.1 V
IO= 6.0 mA - 0.15 0.26 V
ILI input leakage current VI=V
CC or GND; VCC = 5.5 V - - ±0.1 µA
IOZ OFF-state output current VI=V
IH or VIL;V
CC = 5.5 V; VO=V
CC or GND
per input pin; other inputs at VCC or GND;
IO=0A
--±0.5 µA
ICC quiescent supply current VI=V
CC or GND; IO= 0 A; VCC = 5.5 V - - 8.0 µA
∆ICC additional quiescent supply
current (per input pin) VI=V
CC −2.1 V; other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO=0A
nI0 input - 40 144 µA
nI1 input - 40 144 µA
OE input - 135 486 µA
S input - 70 252 µA
Ciinput capacitance - 3.5 - pF
Tamb =−40 °C to +85 °C
VIH HIGH-state input voltage VCC = 4.5 V to 5.5 V 2.0 - - V
VIL LOW-state input voltage VCC = 4.5 V to 5.5 V - - 0.8 V
VOH HIGH-state output voltage VI=V
IH or VIL; VCC = 4.5 V
IO=−20 µA 4.4 - - V
IO=−6 mA 3.84 - - V
VOL LOW-state output voltage VI=V
IH or VIL; VCC = 4.5 V
IO=20µA - - 0.1 V
IO= 6.0 mA - - 0.33 V
ILI input leakage current VI=V
CC or GND; VCC = 5.5 V - - ±1.0 µA
IOZ OFF-state output current VI=V
IH or VIL;V
CC = 5.5 V; VO=V
CC or GND
per input pin; other inputs at VCC or GND;
IO=0A
--±5.0 µA
ICC quiescent supply current VI=V
CC or GND; IO= 0 A; VCC = 5.5 V - - 80 µA
∆ICC additional quiescent supply
current (per input pin) VI=V
CC −2.1 V; other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO=0A
nI0 input - - 180 µA
nI1 input - - 180 µA
OE input - - 608 µA
S input - - 315 µA
Tamb =−40 °C to +125 °C
VIH HIGH-state input voltage VCC = 4.5 V to 5.5 V 2.0 - - V
VIL LOW-state input voltage VCC = 4.5 V to 5.5 V - - 0.8 V
VOH HIGH-state output voltage VI=V
IH or VIL; VCC = 4.5 V
IO=−20 µA 4.4 - - V
IO=−6 mA 3.7 - - V
Table 8: Static characteristics type 74HCT257
…continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 10 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
11. Dynamic characteristics
VOL LOW-state output voltage VI=V
IH or VIL; VCC = 4.5 V
IO=20µA - - 0.1 V
IO= 6.0 mA - - 0.4 V
ILI input leakage current VI=V
CC or GND; VCC = 5.5 V - - ±1.0 µA
IOZ OFF-state output current VI=V
IH or VIL;V
CC = 5.5 V; VO=V
CC or GND
per input pin; other inputs at VCC or GND;
IO=0A
--±10 µA
ICC quiescent supply current VI=V
CC or GND; IO= 0 A; VCC = 5.5 V - - 160 µA
∆ICC additional quiescent supply
current (per input pin) VI=V
CC −2.1 V; other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO=0A
nI0 input - - 196 µA
nI1 input - - 196 µA
OE input - - 662 µA
S input - - 343 µA
Table 8: Static characteristics type 74HCT257
…continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
Table 9: Dynamic characteristics type 74HC257
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF, unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
Tamb = 25 °C
tPHL, tPLH propagation delay
nl0 to nYor nl1 to nY see Figure 6
VCC = 2.0 V - 36 110 ns
VCC = 4.5 V - 13 22 ns
VCC = 5.0 V; CL= 15 pF - 11 - ns
VCC = 6.0 V - 10 19 ns
propagation delay
StonY see Figure 6
VCC = 2.0 V - 47 150 ns
VCC = 4.5 V - 17 30 ns
VCC = 5.0 V; CL= 15 pF - 14 - ns
VCC = 6.0 V - 14 26 ns
tPZH, tPZL 3-state output enable
time OE to nY see Figure 7
VCC = 2.0 V - 33 150 ns
VCC = 4.5 V - 12 30 ns
VCC = 6.0 V - 10 26 ns
tPHZ, tPLZ 3-state output disable
time OE to nY see Figure 7
VCC = 2.0 V - 41 150 ns
VCC = 4.5 V - 15 30 ns
VCC = 6.0 V - 12 26 ns
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 11 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
tTHL, tTLH output transition time see Figure 6
VCC = 2.0 V - 14 60 ns
VCC = 4.5 V - 5 12 ns
VCC = 6.0 V - 4 10 ns
CPD power dissipation
capacitance (per
multiplexer)
VI= GND to VCC [1] -45-pF
Tamb = −40 °C to +85 °C
tPHL, tPLH propagation delay
nl0 to nYor nl1 to nY see Figure 6
VCC = 2.0 V - - 140 ns
VCC = 4.5 V - - 28 ns
VCC = 6.0 V - - 24 ns
propagation delay
StonY see Figure 6
VCC = 2.0 V - - 190 ns
VCC = 4.5 V - - 38 ns
VCC = 6.0 V - - 33 ns
tPZH, tPZL 3-state output enable
time OE to nY see Figure 7
VCC = 2.0 V - - 190 ns
VCC = 4.5 V - - 38 ns
VCC = 6.0 V - - 33 ns
tPHZ, tPLZ 3-state output disable
time OE to nY see Figure 7
VCC = 2.0 V - - 190 ns
VCC = 4.5 V - - 38 ns
VCC = 6.0 V - - 33 ns
tTHL, tTLH output transition time see Figure 6
VCC = 2.0 V - - 75 ns
VCC = 4.5 V - - 15 ns
VCC = 6.0 V - - 13 ns
Tamb = −40 °C to +125 °C
tPHL, tPLH propagation delay
nl0 to nYor nl1 to nY see Figure 6
VCC = 2.0 V - - 165 ns
VCC = 4.5 V - - 33 ns
VCC = 6.0 V - - 28 ns
propagation delay
StonY see Figure 6
VCC = 2.0 V - - 225 ns
VCC = 4.5 V - - 45 ns
VCC = 6.0 V - - 38 ns
Table 9: Dynamic characteristics type 74HC257
…continued
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF, unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 12 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
[1] CPD is used to determine the dynamic power dissipation (PD in µW).
PD=C
PD ×VCC2×fi×N+∑(CL×VCC2×fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑(CL×VCC2×fo) = sum of outputs.
tPZH, tPZL 3-state output enable
time OE to nY see Figure 7
VCC = 2.0 V - - 225 ns
VCC = 4.5 V - - 45 ns
VCC = 6.0 V - - 38 ns
tPHZ, tPLZ 3-state output disable
time OE to nY see Figure 7
VCC = 2.0 V - - 225 ns
VCC = 4.5 V - - 45 ns
VCC = 6.0 V - - 38 ns
tTHL, tTLH output transition time see Figure 6
VCC = 2.0 V - - 90 ns
VCC = 4.5 V - - 18 ns
VCC = 6.0 V - - 15 ns
Table 10: Dynamic characteristics type 74HCT257
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF, unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
Tamb = 25 °C
tPHL, tPLH propagation delay
nl0 to nYor nl1 to nY see Figure 6
VCC = 4.5 V - 16 30 ns
VCC = 5.0 V; CL= 15 pF - 13 - ns
propagation delay
S to nY see Figure 6
VCC = 4.5 V - 20 35 ns
VCC = 5.0 V; CL= 15 pF - 17 - ns
tPZH, tPZL 3-state output enable
time OE to nY VCC = 4.5 V; see Figure 7 - 1530ns
tPHZ, tPLZ 3-state output disable
time OE to nY VCC = 4.5 V; see Figure 7 - 1630ns
tTHL, tTLH output transition time VCC = 4.5 V; see Figure 6 - 5 12 ns
Tamb = −40 °C to +85 °C
tPHL, tPLH propagation delay
nl0 to nYor nl1 to nY VCC = 4.5 V; see Figure 6 --38ns
propagation delay
S to nY VCC = 4.5 V; see Figure 6 --44ns
Table 9: Dynamic characteristics type 74HC257
…continued
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF, unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 13 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
[1] CPD is used to determine the dynamic power dissipation (PD in µW).
PD=C
PD ×VCC2×fi×N+∑(CL×VCC2×fo) where:
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑(CL×VCC2×fo) = sum of outputs.
12. Waveforms
tPZH, tPZL 3-state output enable
time OE to nY VCC = 4.5 V; see Figure 7 --38ns
tPHZ, tPLZ 3-state output disable
time OE to nY VCC = 4.5 V; see Figure 7 --38ns
tTHL, tTLH output transition time VCC = 4.5 V; see Figure 6 --15ns
Tamb = −40 °C to +125 °C
tPHL, tPLH propagation delay
nl0 to nYor nl1 to nY VCC = 4.5 V; see Figure 6 --45ns
propagation delay
S to nY VCC = 4.5 V; see Figure 6 --53ns
tPZH, tPZL 3-state output enable
time OE to nY VCC = 4.5 V; see Figure 7 --45ns
tPHZ, tPLZ 3-state output disable
time OE to nY VCC = 4.5 V; see Figure 7 --45ns
tTHL, tTLH output transition time VCC = 4.5 V; see Figure 6 --18ns
CPD power dissipation
capacitance (per
multiplexer)
VI= GND to VCC [1] -45-pF
Table 10: Dynamic characteristics type 74HCT257
…continued
Voltages are referenced to GND (ground = 0 V); C
L
= 50 pF, unless otherwise specified.
For test circuit see Figure 8.
Symbol Parameter Conditions Min Typ Max Unit
Measurement points are given in Table 11.
VOL and VOH are typical voltage output drop that occur with the output load.
Fig 6. Propagation delays input (S, nI0, nI1) to output (nY) and output (nY) transition
times
001aad477
tPLH
tPHL
VM
VM
90 %
10 %
VMVM
output
nY
input
S, nI0, nI1
VI
GND
VOH
VOL
tTLH
tTHL
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 14 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Measurement points are given in Table 11.
VOL and VOH are typical voltage output drop that occur with the output load.
Fig 7. 3-state output enable and disable times
Table 11: Measurement points
Type Input Output
VMVM
74HC257 0.5VCC 0.5VCC
74HCT257 1.3 V 1.3 V
001aac479
tPLZ
tPHZ
outputs
disabled outputs
enabled
90 %
10 %
outputs
enabled
OE input
VI
VCC
VOL
VOH
GND
GND
VM
tPZL
tPZH
VM
VM
output
LOW-to-OFF
OFF-to-LOW
output
HIGH-to-OFF
OFF-to-HIGH
trtf
90 %
10 %
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 15 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Measurement points are given in Table 11.
a. Input pulse definition
Test data is given in Table 12.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
RL = Load resistor.
b. Test circuit
Fig 8. Load circuitry for switching times
Table 12: Test data
Type Input Switch position
VItr, tftPHL, tPLH tPZH, tPHZ tPZL, tPLZ
74HC257 VCC 6 ns open GND VCC
74HCT257 3 V 6 ns open GND VCC
001aac221
VMVM
tW
tW
10 %
90 % 90 %
0 V
VI
VI
negative
pulse
positive
pulse
0 V
VMVM
90 %
10 % 10 %
tTHL(tf)
tTLH(tr)
tTLH(tr)
tTHL(tf)
mgk563
D.U.T
VCC VCC
VIVO
RT
RL = 1 kΩ
CL50 pF
open
PULSE
GENERATOR
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 16 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
13. Package outline
Fig 9. Package outline SOT38-1 (DIP16)
UNIT A
max. 1 2 b1cEe M
H
L
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
SOT38-1 99-12-27
03-02-13
A
min. A
max. bmax.
w
ME
e1
1.40
1.14
0.055
0.045
0.53
0.38 0.32
0.23 21.8
21.4
0.86
0.84
6.48
6.20
0.26
0.24
3.9
3.4
0.15
0.13
0.2542.54 7.62
0.3
8.25
7.80
0.32
0.31
9.5
8.3
0.37
0.33
2.2
0.087
4.7 0.51 3.7
0.15 0.021
0.015 0.013
0.009 0.010.10.020.19
050G09 MO-001 SC-503-16
MH
c
(e )
1
ME
A
L
seating plane
A1
wM
b1
e
D
A2
Z
16
1
9
8
b
E
pin 1 index
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
(1) (1)
D(1)
Z
DIP16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 17 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Fig 10. Package outline SOT109-1 (SO16)
X
wM
θ
A
A1
A2
bp
D
HE
Lp
Q
detail X
E
Z
e
c
L
vMA
(A )
3
A
8
9
1
16
y
pin 1 index
UNIT A
max. A1A2A3bpcD
(1) E(1) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm
inches
1.75 0.25
0.10 1.45
1.25 0.25 0.49
0.36 0.25
0.19 10.0
9.8 4.0
3.8 1.27 6.2
5.8 0.7
0.6 0.7
0.3 8
0
o
o
0.25 0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
1.0
0.4
SOT109-1 99-12-27
03-02-19
076E07 MS-012
0.069 0.010
0.004 0.057
0.049 0.01 0.019
0.014 0.0100
0.0075 0.39
0.38 0.16
0.15 0.05
1.05
0.041
0.244
0.228 0.028
0.020 0.028
0.012
0.01
0.25
0.01 0.004
0.039
0.016
0 2.5 5 mm
scale
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 18 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Fig 11. Package outline SOT338-1 (SSOP16)
UNIT A1A2A3bpcD
(1) E(1) eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.21
0.05 1.80
1.65 0.25 0.38
0.25 0.20
0.09 6.4
6.0 5.4
5.2 0.65 1.25
7.9
7.6 1.03
0.63 0.9
0.7 1.00
0.55 8
0
o
o
0.130.2 0.1
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
SOT338-1 99-12-27
03-02-19
(1)
wM
bp
D
HE
E
Z
e
c
vMA
X
A
y
18
16 9
θ
A
A1
A2
Lp
Q
detail X
L
(A )
3
MO-150
pin 1 index
0 2.5 5 mm
scale
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm SOT338-1
A
max.
2
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 19 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Fig 12. Package outline SOT403-1 (TSSOP16)
UNIT A1A2A3bpcD
(1) E(2) (1)
eH
ELL
pQZywv θ
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
mm 0.15
0.05 0.95
0.80 0.30
0.19 0.2
0.1 5.1
4.9 4.5
4.3 0.65 6.6
6.2 0.4
0.3 0.40
0.06 8
0
o
o
0.13 0.10.21
DIMENSIONS (mm are the original dimensions)
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.
0.75
0.50
SOT403-1 MO-153 99-12-27
03-02-18
wM
bp
D
Z
e
0.25
18
16 9
θ
A
A1
A2
Lp
Q
detail X
L
(A )
3
HE
E
c
vMA
X
A
y
0 2.5 5 mm
scale
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1
A
max.
1.1
pin 1 index
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 20 of 22
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
14. Revision history
Table 13: Revision history
Document ID Release
date Data sheet status Change notice Doc. number Supersedes
74HC_HCT257_3 20050920 Product data sheet - - 74HC_HCT257_CNV_2
Modifications: •The format of this data sheet has been redesigned to comply with the new presentation and
information standard of Philips Semiconductors.
•Added family specifications.
74HC_HCT257_CNV_2 19980930 Product specification - - -
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
74HC_HCT257_3 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 03 — 20 September 2005 21 of 22
15. Data sheet status
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at
URL http://www.semiconductors.philips.com.
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
16. Definitions
Short-form specification — The data in a short-form specification is
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.
Application information — Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
make no representation or warranty that such applications will be suitable for
the specified use without further testing or modification.
17. Disclaimers
Life support — These products are not designed for use in life support
appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to
make changes in the products - including circuits, standard cells, and/or
software - described or contained herein in order to improve design and/or
performance. When the product is in full production (status ‘Production’),
relevant changes will be communicated via a Customer Product/Process
Change Notification (CPCN). Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are
free from patent, copyright, or mask work right infringement, unless otherwise
specified.
18. Trademarks
Notice — All referenced brands, product names, service names and
trademarks are the property of their respective owners.
19. Contact information
For additional information, please visit: http://www.semiconductors.philips.com
For sales office addresses, send an email to: sales.addresses@www.semiconductors.philips.com
Level Data sheet status[1] Product status[2] [3] Definition
I Objective data Development This data sheet contains data from the objective specification for product development. Philips
Semiconductors reserves the right to change the specification in any manner without notice.
II Preliminary data Qualification This data sheet contains data from the preliminary specification.Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
III Product data Production This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
© Koninklijke Philips Electronics N.V. 2005
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner. The information presented in this document does
not form part of any quotation or contract, is believed to be accurate and reliable and may
be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.
Date of release: 20 September 2005
Document number: 74HC_HCT257_3
Published in The Netherlands
Philips Semiconductors 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
20. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3 Quick reference data . . . . . . . . . . . . . . . . . . . . . 2
4 Ordering information. . . . . . . . . . . . . . . . . . . . . 2
5 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 3
6 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
7 Functional description . . . . . . . . . . . . . . . . . . . 5
7.1 Function table. . . . . . . . . . . . . . . . . . . . . . . . . . 5
8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6
9 Recommended operating conditions. . . . . . . . 6
10 Static characteristics. . . . . . . . . . . . . . . . . . . . . 7
11 Dynamic characteristics . . . . . . . . . . . . . . . . . 10
12 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
13 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 16
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 20
15 Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 21
16 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
17 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
18 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
19 Contact information . . . . . . . . . . . . . . . . . . . . 21
