1. General description
The 74HC237 is a high-speed Si-gate CMOS device and is pin compatible with low power
Schottky TTL (LSTTL). The 74HC237 is specified in compliance with JEDEC
standard no. 7A.
The 74HC237 is a 3-to-8 line decoder, demultiplexer with latches at the three address
inputs (An). The 74HC237 essentially combines the 3-to-8 decoder function with a 3-bit
storage latch. When the latch is enabled (LE = LOW), the 74HC237 acts as a 3-to-8 active
LOW decoder. When the latch enable (LE) goes from LOW-to-HIGH, the last data present
at the inputs before this transition, is stored in the latches. Further address changes are
ignored as long as LE remains HIGH.
The output enable input (E1 and E2) controls the state of the outputs independent of the
address inputs or latch operation. All outputs are HIGH unless E1 is LOW and E2 is HIGH.
The 74HC237 is ideally suited for implementing non-overlapping decoders in 3-state
systems and strobed (stored address) applications in bus oriented systems.
2. Features
■Combines 3-to-8 decoder with 3-bit latch
■Multiple input enable for easy expansion or independent controls
■Active HIGH mutually exclusive outputs
■Low-power dissipation
■Complies with JEDEC standard no. 7A
■ESD protection:
◆HBM EIA/JESD22-A114-B exceeds 2000 V
◆MM EIA/JESD22-A115-A exceeds 200 V.
■Multiple package options
■Specified from −40 °Cto+80°C and from −40 °C to +125 °C.
74HC237
3-to-8 line decoder, demultiplexer with address latches
Rev. 03 — 12 November 2004 Product data sheet
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 2 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
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
tPHL, tPLH propagation delay CL= 15 pF; VCC =5 V
An to Yn - 16 - ns
LE to Yn - 19 - ns
E1 to Yn - 14 - ns
E2 to Yn - 14 - ns
CIinput capacitance - 3.5 - pF
CPD power dissipation
capacitance VI= GND to VCC [1] -60-pF
Table 2: Ordering information
Type number Package
Temperature range Name Description Version
74HC237N −40 °C to +125 °C DIP16 plastic dual in-line package; 16 leads (300 mil) SOT38-4
74HC237D −40 °C to +125 °C SO16 plastic small outline package; 16 leads;
body width 3.9 mm SOT109-1
74HC237DB −40 °C to +125 °C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm SOT338-1
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 3 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
5. Functional diagram
Fig 1. Functional diagram
Fig 2. Logic symbol Fig 3. IEC logic symbol
001aab871
Y0
Y1
Y2
3 TO 8
DECODER
INPUT
LATCHES
Y3
Y4
Y5
Y6
Y7 7
9
10
11
12
13
14
15
A0
A1
E1
E2
A2
LE
4
3
5
6
2
1
001aab869
Y0
Y1
Y2
3 TO 8
DECODER
INPUT
LATCHES Y3
Y4
Y5
Y6
Y7 7
9
10
11
12
13
14
15
A0
A1
E1
E2
5
6
A2
LE
4
3
2
1
001aab870
0
1
2
3
4
5
6
77
9
10
11
12
13
14
15
C8
8D,1
8D,2
X/Y
EN
&
2
8D,4
3
5
6
1
4
0
1
2
3
4
5
6
77
9
10
11
12
13
14
15
C8
0
8D,G 0
7
DX
&
2
2
3
5
6
1
4
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 4 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
6. Pinning information
6.1 Pinning
Fig 4. Logic diagram
001aab872
E1
E2
A0
A1
A2
LE
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
A0
A0
LELE
LATCH
A1
A1
LELE
LATCH
A2
A2
LELE
LATCH
Fig 5. Pin configuration
237
A0 VCC
A1 Y0
A2 Y1
LE Y2
E1 Y3
E2 Y4
Y7 Y5
GND Y6
001aab868
1
2
3
4
5
6
7
8
10
9
12
11
14
13
16
15
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 5 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
6.2 Pin description
7. Functional description
7.1 Function table
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care.
Table 3: Pin description
Symbol Pin Description
A0 1 data input 0
A1 2 data input 1
A2 3 data input 2
LE 4 latch enable input (active LOW)
E1 5 data enable input 1 (active LOW)
E2 6 data enable input 2 (active HIGH)
Y7 7 multiplexer output 7
GND 8 ground (0 V)
Y6 9 multiplexer output 6
Y5 10 multiplexer output 5
Y4 11 multiplexer output 4
Y3 12 multiplexer output 3
Y2 13 multiplexer output 2
Y1 14 multiplexer output 1
Y0 15 multiplexer output 0
VCC 16 positive supply voltage
Table 4: Function table
Enable Input Output
LE E1 E2 A0 A1 A2 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
H L H X X X stable
XHXXXXLLLLLLLL
XXLXXXLLLLLLLL
LLHLLLHLLLLLLL
HLLLHLLLLLL
LHLLLHLLLLL
HHLLLLHLLLL
LLHLLLLHLLL
HLHLLLLLHLL
LHHLLLLLLHL
HHHLLLLLLLH
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 6 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
8. Limiting values
[1] Above 70 °C: Ptot derates linearly with 12 mW/K.
[2] Above 70 °C: Ptot derates linearly with 8 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 diode current VI < −0.5 V or VI>V
CC + 0.5 V - ±20 mA
IOK output diode current VO<−0.5 V or
VO>V
CC + 0.5 V -±20 mA
IOoutput source or sink
current VO = −0.5 V to VCC + 0.5 V - ±25 mA
ICC, IGND VCC or GND current - ±50 mA
Tstg storage temperature −65 +150 °C
Ptot power dissipation
DIP16 package [1] - 750 mW
SO16 and SSOP16
packages [2] - 500 mW
Table 6: Recommended operating conditions
Symbol Parameter Conditions Min Typ Max Unit
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
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 7 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
10. Static characteristics
Table 7: Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
Tamb =25°C
VIH HIGH-level 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-level 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-level 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=−4 mA; VCC = 4.5 V 3.98 4.32 - V
IO=−5.2 mA; VCC = 6.0 V 5.48 5.81 - V
VOL LOW-level 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= 4 mA; VCC = 4.5 V - 0.15 0.26 V
IO= 5.2 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
ICC quiescent supply current VI=V
CC or GND; IO=0A;
VCC = 6.0 V - - 8.0 µA
CIinput capacitance - 3.5 - pF
Tamb =−40 °C to +85 °C
VIH HIGH-level 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-level 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-level 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=−4 mA; VCC = 4.5 V 3.84 - - V
IO=−5.2 mA; VCC = 6.0 V 5.34 - - V
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 8 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
VOL LOW-level 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= 4 mA; VCC = 4.5 V - - 0.33 V
IO= 5.2 mA; VCC = 6.0 V - - 0.33 V
ILI input leakage current VI=V
CC or GND; VCC = 6.0 V - - ±1.0 µA
ICC quiescent supply current VI=V
CC or GND; IO=0A;
VCC = 6.0 V --80µA
Tamb =−40 °C to +125 °C
VIH HIGH-level 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-level 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-level 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=−4 mA; VCC = 4.5 V 3.7 - - V
IO=−5.2 mA; VCC = 6.0 V 5.2 - - V
VOL LOW-level 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= 4 mA; VCC = 4.5 V - - 0.4 V
IO= 5.2 mA; VCC = 6.0 V - - 0.4 V
ILI input leakage current VI=V
CC or GND; VCC = 6.0 V - - ±1.0 µA
ICC quiescent supply current VI=V
CC or GND; IO=0A;
VCC = 6.0 V - - 160 µA
Table 7: Static characteristics
…continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Typ Max Unit
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 9 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
11. Dynamic characteristics
Table 8: Dynamic characteristics
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF; see Figure 9.
Symbol Parameter Conditions Min Typ Max Unit
Tamb = 25 °C
tPHL, tPLH propagation delay An to Yn see Figure 6
VCC = 2.0 V - 52 160 ns
VCC = 4.5 V - 19 32 ns
VCC = 6.0 V - 15 27 ns
VCC = 5.0 V; CL= 15 pF - 16 - ns
propagation delay LE to Yn see Figure 6
VCC = 2.0 V - 61 190 ns
VCC = 4.5 V - 22 38 ns
VCC = 6.0 V - 18 32 ns
VCC = 5.0 V; CL= 15 pF - 19 - ns
propagation delay E1to Yn see Figure 7
VCC = 2.0 V - 47 145 ns
VCC = 4.5 V - 17 29 ns
VCC = 6.0 V - 14 25 ns
VCC = 5.0 V; CL= 15 pF - 14 - ns
propagation delay E2 to Yn see Figure 6
VCC = 2.0 V - 47 145 ns
VCC = 4.5 V - 17 29 ns
VCC = 6.0 V - 14 25 ns
VCC = 5.0 V; CL= 15 pF - 14 - ns
tTHL, tTLH output transition time see Figure 7
VCC = 2.0 V - 19 75 ns
VCC = 4.5 V - 7 15 ns
VCC = 6.0 V - 6 13 ns
tWLE pulse width HIGH see Figure 8
VCC = 2.0 V 50 11 - ns
VCC = 4.5 V 10 4 - ns
VCC = 6.0 V 9 3 - ns
tsu set-up time An to LE see Figure 8
VCC = 2.0 V 50 6 - ns
VCC = 4.5 V 10 2 - ns
VCC = 6.0 V 9 2 - ns
thhold time An to LE see Figure 8
VCC = 2.0 V 30 3 - ns
VCC = 4.5 V 6 1 - ns
VCC = 6.0 V 5 1 - ns
CPD power dissipation capacitance VI= GND to VCC [1] -60-pF
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 10 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
Tamb = −40 °C to +85 °C
tPHL, tPLH propagation delay An to Yn see Figure 6
VCC = 2.0 V - - 200 ns
VCC = 4.5 V - - 40 ns
VCC = 6.0 V - - 34 ns
propagation delay LE to Yn see Figure 6
VCC = 2.0 V - - 240 ns
VCC = 4.5 V - - 48 ns
VCC = 6.0 V - - 41 ns
propagation delay E1 to Yn see Figure 7
VCC = 2.0 V - - 180 ns
VCC = 4.5 V - - 36 ns
VCC = 6.0 V - - 31 ns
propagation delay E2 to Yn see Figure 6
VCC = 2.0 V - - 180 ns
VCC = 4.5 V - - 36 ns
VCC = 6.0 V - - 31 ns
tTHL, tTLH output transition time see Figure 7
VCC = 2.0 V - - 95 ns
VCC = 4.5 V - - 19 ns
VCC = 6.0 V - - 16 ns
tWLE pulse width HIGH see Figure 8
VCC = 2.0 V 65 - - ns
VCC = 4.5 V 13 - - ns
VCC = 6.0 V 11 - - ns
tsu set-up time An to LE see Figure 8
VCC = 2.0 V 65 - - ns
VCC = 4.5 V 13 - - ns
VCC = 6.0 V 11 - - ns
thhold time An to LE see Figure 8
VCC = 2.0 V 40 - - ns
VCC = 4.5 V 8 - - ns
VCC = 6.0 V 7 - - ns
Table 8: Dynamic characteristics
…continued
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF; see Figure 9.
Symbol Parameter Conditions Min Typ Max Unit
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 11 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
[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.
Tamb = −40 °C to +125 °C
tPHL, tPLH propagation delay An to Yn see Figure 6
VCC = 2.0 V - - 240 ns
VCC = 4.5 V - - 48 ns
VCC = 6.0 V - - 41 ns
propagation delay LE to Yn see Figure 6
VCC = 2.0 V - - 285 ns
VCC = 4.5 V - - 57 ns
VCC = 6.0 V - - 48 ns
propagation delay E1 to Yn see Figure 7
VCC = 2.0 V - - 220 ns
VCC = 4.5 V - - 44 ns
VCC = 6.0 V - - 38 ns
propagation delay E2 to Yn see Figure 6
VCC = 2.0 V - - 220 ns
VCC = 4.5 V - - 44 ns
VCC = 6.0 V - - 38 ns
tTHL, tTLH output transition time see Figure 7
VCC = 2.0 V - - 110 ns
VCC = 4.5 V - - 22 ns
VCC = 6.0 V - - 19 ns
tWLE pulse width HIGH see Figure 8
VCC = 2.0 V 75 - - ns
VCC = 4.5 V 15 - - ns
VCC = 6.0 V 13 - - ns
tsu set-up time An to LE see Figure 8
VCC = 2.0 V 75 - - ns
VCC = 4.5 V 15 - - ns
VCC = 6.0 V 13 - - ns
thhold time An to LE see Figure 8
VCC = 2.0 V 45 - - ns
VCC = 4.5 V 9 - - ns
VCC = 6.0 V 8 - - ns
Table 8: Dynamic characteristics
…continued
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF; see Figure 9.
Symbol Parameter Conditions Min Typ Max Unit
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 12 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
12. Waveforms
VM= 0.5 ×VI.
Fig 6. Waveforms showing the address input (An) and enable inputs (E2, LE) to output
(Yn) propagation delays and the output transition times
VM= 0.5 ×VI.
Fig 7. Waveforms showing the enable input (E1) to output (Yn) propagation delays and
the output transition times
The shaded areas indicate when the input is permitted to change for predictable output
performance.
VM= 0.5 ×VI.
Fig 8. Waveforms showing the data set-up, hold times for An input to LE input and the
latch enable pulse width
001aab873
An, E2, LE
input
Yn output
VM
tPHL
tTHL tTLH
tPLH
VM
001aab874
E1 input
Yn output
VM
tPHL
tTHL tTLH
tPLH
VM
tsu th
LE input
VM
VM
001aab875
th
tsu
tW
An input
transparant transparantlatched latched
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 13 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
13. Application information
Test data is given in Table 9.
Definitions for test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
Fig 9. Load circuitry for switching times
Table 9: Test data
Supply Input Load
VCC VItr, tfCL
2.0 V VCC 6 ns 50 pF
4.5 V VCC 6 ns 50 pF
6.0 V VCC 6 ns 50 pF
5.0 V VCC 6 ns 15 pF
mna101
VCC
VIVO
RTCL
PULSE
GENERATOR D.U.T.
Fig 10. 6-to-64 line decoder with input address storage
001aab876
16
237
outputs
to five
other
decoders
17 18 19 20 21 22 23
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
LE A2 A1 A0 E1 E2
8
237
outputs
9 10 11 12 13 14 15
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
LE A2 A1 A0 E1 E2
0
237
outputs
1 2 3 4 5 6 7
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
LE A2 A1 A0 E1 E2
0
237
123 4 5 6 7
Y0
X0
decoder enable
input
address
strobe
X1
X2
X3
X4
X5
Y1 Y2 Y3 Y4 Y5 Y6 Y7
LE A2 A1 A0 E1 E2
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 14 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
14. Package outline
Fig 11. Package outline SOT38-4 (DIP16)
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC JEITA
SOT38-4 95-01-14
03-02-13
MH
c
(e )
1
ME
A
L
seating plane
A1
wM
b1
b2
e
D
A2
Z
16
1
9
8
E
pin 1 index
b
0 5 10 mm
scale
Note
1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
UNIT A
max. 12 b1(1) (1) (1)
b2cD E e M Z
H
L
mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
A
min. A
max. bmax.
w
ME
e1
1.73
1.30 0.53
0.38 0.36
0.23 19.50
18.55 6.48
6.20 3.60
3.05 0.2542.54 7.62 8.25
7.80 10.0
8.3 0.764.2 0.51 3.2
inches 0.068
0.051 0.021
0.015 0.014
0.009
1.25
0.85
0.049
0.033 0.77
0.73 0.26
0.24 0.14
0.12 0.010.1 0.3 0.32
0.31 0.39
0.33 0.030.17 0.02 0.13
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 15 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
Fig 12. 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
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 16 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
Fig 13. 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
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 17 of 19
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
15. Revision history
Table 10: Revision history
Document ID Release
date Data sheet status Change notice Doc. number Supersedes
74HC237_3 20041112 Product data sheet - 9397 750 13807 74HC_HCT237_CNV_2
Modifications: •The format of this data sheet has been redesigned to comply with the current presentation
and information standard of Philips Semiconductors.
•Removed type number 74HCT237.
•Inserted family specification.
74HC_HCT237_CNV_2 19970828 Product specification - - 74HC_HCT237_1
74HC_HCT237_1 19901201 Product specification - - -
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
9397 750 13807 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet Rev. 03 — 12 November 2004 18 of 19
16. 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.
17. 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.
18. 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.
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. 2004
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: 12 November 2004
Document number: 9397 750 13807
Published in The Netherlands
Philips Semiconductors 74HC237
3-to-8 line decoder, demultiplexer with address latches
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 . . . . . . . . . . . . . . . . . . 9
12 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
13 Application information. . . . . . . . . . . . . . . . . . 13
14 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 14
15 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 17
16 Data sheet status. . . . . . . . . . . . . . . . . . . . . . . 18
17 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
18 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
19 Contact information . . . . . . . . . . . . . . . . . . . . 18
