1. General description
The 74HC257; 74HCT257 is a quad 2-input multiplexer with 3-state outputs. Inputs
include clamp diodes. This enables the use of current limiting resistors to interface inputs
to voltages in excess of VCC.
2. Features and benefits
Non-inverting data path
3-state outp uts interface directly with system b us
Complies with JEDEC standard no. 7A
Input levels:
For 74HC257: CMOS level
For 74HCT257: TTL level
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from 40 Cto+85C and from 40 Cto+125C
3. Ordering information
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Rev. 7 — 2 February 2016 Product data sheet
Table 1. Ordering information
Type number Package
Temperature range Name Description Version
74HC257D 40 C to +125 C SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
74HCT257D
74HC257DB 40 C to +125 C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm SOT338-1
74HCT257DB
74HC257PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm SOT403-1
74HCT257PW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 2 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
4. Functional diagram
Fig 1. Logic symbol Fig 2. IEC logic symbol
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Fig 3. Functional diag ram
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 3 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
5. Pinning information
5.1 Pinning
Fig 4. Logic diagra m
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Fig 5. Pin configuration S O16, SSOP16 and TSSOP16
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 4 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
5.2 Pin description
6. Functional description
6.1 Function table
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[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.
Table 2. Pin description
Symbol Pin Description
S 1 common data select input
1I0 to 4I0 2, 5, 11, 14 data input from source 0
1I1 to 4I1 3, 6, 10, 13 data input from source 1
1Y to 4Y 4, 7, 9, 12 3-state multiplexer output
GND 8 ground (0 V)
OE 15 3-state output enable input (active LOW)
VCC 16 supply voltage
Table 3. Function table[1]
Control Input Output
OE Snl0 nl1 nY
HXXXZ
LHXLL
LHXHH
LLLXL
LLHXH
Table 4. 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 [1] -20 mA
IOK output clamping current VO<0.5 V or VO>V
CC +0.5V [1] -20 mA
IOoutput current VO = 0.5 V to VCC +0.5V - 35 mA
ICC supply current - +70 mA
IGND ground current 70 - mA
Tstg storage temperature 65 +150 C
Ptot total power dissipation SO16 package [2] -500mW
SSOP16 package [3] -500mW
TSSOP16 p ackage [3] -500mW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 5 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
8. Recommended operating conditions
9. Static characteristics
Table 5. Recommended operating con ditions
Symbol Parameter Conditions Min Typ Max Unit
74HC257
VCC supply voltage 2.0 5.0 6.0 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
t/V input transition rise and
fall rates VCC = 2.0 V - - 625 ns
VCC = 4.5 V - 1.67 139 ns
VCC = 6.0 V - - 83 ns
Tamb ambient temperature 40 - +125 C
74HCT257
VCC supply voltage 4.5 5.0 5.5 V
VIinput voltage 0 - VCC V
VOoutput voltage 0 - VCC V
t/V input transition rise and
fall rates VCC = 4.5 V - 1.67 139 ns
Tamb ambient temperature 40 - +125 C
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 C40 C to
+85 C40 C to
+125 CUnit
Min Typ Max Min Max Min Max
74HC257
VIH HIGH-level
input voltage VCC = 2.0 V 1.5 1.2 - 1.5 - 1.5 - V
VCC = 4.5 V 3.15 2.4 - 3.15 - 3.15 - V
VCC = 6.0 V 4.2 3.2 - 4.2 - 4.2 - V
VIL LOW-level
input voltage VCC = 2.0 V - 0.8 0.5 - 0.5 - 0.5 V
VCC = 4.5 V - 2.1 1.35 - 1.35 - 1.35 V
VCC = 6.0 V - 2.8 1.8 - 1.8 - 1.8 V
VOH HIGH-level
output voltage VI=V
IH or VIL
IO=20 A; VCC = 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
IO=20 A; VCC = 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
IO=20 A; VCC = 6.0 V 5.9 6.0 - 5.9 - 5.9 - V
IO=6.0 mA; VCC = 4.5 V 3.98 4.32 - 3.84 - 3.7 - V
IO=7.8 m A; VCC = 6.0 V 5.48 5.81 - 5.34 - 5.2 - V
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 6 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
VOL LOW-level
output voltage VI=V
IH or VIL
IO=20A; VCC = 2.0 V - 0 0.1 - 0.1 - 0.1 V
IO=20A; VCC = 4.5 V - 0 0.1 - 0.1 - 0.1 V
IO=20A; VCC = 6.0 V - 0 0.1 - 0.1 - 0.1 V
IO= 6.0 mA; VCC = 4.5 V - 0.15 0.26 - 0.33 - 0.4 V
IO= 7.8 mA; VCC = 6.0 V - 0.16 0.26 - 0.33 - 0.4 V
IIinput leakage curren t VI=V
CC or GND; VCC =6.0V - - 0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current VI=V
IH or VIL;
VO=V
CC or GND;
VCC =6.0V
--0.5 - 5.0 - 10.0 A
ICC supply current VI=V
CC or GND; IO=0A;
VCC =6.0V - - 8.0 - 80 - 160 A
Ciinput capacitance - 3.5 - - - - - pF
74HCT257
VIH HIGH-level
input voltage VCC = 4.5 V to 5.5 V 2.0 1.6 - 2.0 - 2.0 - V
VIL LOW-level
input voltage VCC = 4.5 V to 5.5 V - 1.2 0.8 - 0.8 - 0.8 V
VOH HIGH-level
output voltage VI=V
IH or VIL; VCC =4.5V
IO=20 A 4.4 4.5 - 4.4 - 4.4 - V
IO=6 mA 3.98 4.32 - 3.84 - 3.7 - V
VOL LOW-level
output voltage VI=V
IH or VIL; VCC =4.5V
IO=20A-00.1-0.33-0.4V
IO= 6.0 mA - 0.15 0.26 - 0.33 - 0.4 V
IIinput leakage curren t VI=V
CC or GND; VCC =5.5V - - 0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current VI=V
IH or VIL;
VO=V
CC or GND;
VCC =5.5V
--0.5 - 5.0 - 10 A
ICC supply current VI=V
CC or GND; IO=0A;
VCC =5.5V - - 8.0 - 80 - 160 A
ICC additional supply
current VI=V
CC 2.1 V;
other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO=0A
per input pin; nI0, nI1 inputs - 40 144 - 180 - 196 A
per input pin; OE input - 135 486 - 608 - 662 A
per input pin; S input - 70 252 - 315 - 343 A
CIinput capacitance - 3.5 - - - - - pF
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions 25 C40 C to
+85 C40 C to
+125 CUnit
Min Typ Max Min Max Min Max
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 7 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); For test circuit see Figure 8.
Symbol Parameter Conditions 25 C 40 C to
+85 C40 C to
+125 CUnit
Typ Max Max Max
74HC257
tpd propagation
delay nl0 to nYor nl1 to nY; see Figure 6 [1]
VCC = 2.0 V 36 110 140 165 ns
VCC = 4.5 V 13 22 28 33 ns
VCC = 5.0 V; CL = 15 pF 11 - - - ns
VCC = 6.0 V 10 19 24 28 ns
StonY; see Figure 6
VCC = 2.0 V 47 15 0 190 225 ns
VCC = 4.5 V 17 30 38 45 ns
VCC = 5.0 V; CL = 15 pF 14 - - - ns
VCC = 6.0 V 14 26 33 38 ns
ten enable time OE to nY; see Figure 7 [2]
VCC = 2.0 V 33 15 0 190 225 ns
VCC = 4.5 V 12 30 38 45 ns
VCC = 6.0 V 10 26 33 38 ns
tdis disable time OE to nY; see Figure 7 [3]
VCC = 2.0 V 41 15 0 190 225 ns
VCC = 4.5 V 15 30 38 45 ns
VCC = 6.0 V 12 26 33 38 ns
tttransition time see Figure 6 [4]
VCC = 2.0 V 14 60 75 90 ns
VCC = 4.5 V 5 12 15 18 ns
VCC = 6.0 V 4 10 13 15 ns
CPD power dissipation
capacitance per multiplexer; VI=GNDtoV
CC [5] 45 - - - pF
74HCT257
tpd propagation
delay nl0 to nYor nl1 to nY; see Figure 6 [1]
VCC = 4.5 V 16 30 38 45 ns
VCC = 5.0 V; CL = 15 pF 13 - - - ns
S to nY; see Figure 6
VCC = 4.5 V 20 35 44 53 ns
VCC = 5.0 V; CL = 15 pF 17 - - - ns
ten enable time OE to nY; VCC = 4.5 V; see Figure 7 [2] 15 30 38 45 ns
tdis disable time OE to nY; VCC = 4.5 V; see Figure 7 [3] 16 30 38 45 ns
tttransition time VCC = 4.5 V; see Figure 6 [4] 512 15 18ns
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 8 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
[1] tpd is the same as tPHL, tPLH.
[2] ten is the same as tPZH, tPZL.
[3] tdis is the same as tPHZ, tPLZ.
[4] tt is the same as tTHL, tTLH.
[5] CPD is used to determine the dynamic power dissipation (PD in W).
PD=C
PD VCC2fiN+(CLVCC2fo) 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;
(CLVCC2 fo) = sum of outputs.
11. Waveforms
CPD power dissipation
capacitance per mu ltipl exer; VI=GNDtoV
CC 1.5 V [5] 45 - - - pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); For test circuit see Figure 8.
Symbol Parameter Conditions 25 C 40 C to
+85 C40 C to
+125 CUnit
Typ Max Max Max
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6. Propagation delays input (S, nI0, nI1) to output (nY) and output (nY) transition times
DDG
W3/+
W3+/
90
90
9090
RXWSXW
Q<
LQSXW
6Q,Q,
9,
*1'
92+
92/
W7/+
W7+/
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 9 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7. 3-state output enable and disable times
DDF
W3/=
W3+=
RXWSXWV
GLVDEOHG
RXWSXWV
HQDEOHG
RXWSXWV
HQDEOHG
2(LQSXW
9,
9&&
92/
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*1'
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W3=/
W3=+
90
90
RXWSXW
/2:WR2))
2))WR/2:
RXWSXW
+,*+WR2))
2))WR+,*+
WUWI
Table 8. Measurement points
Type Input Output
VMVM
74HC257 0.5VCC 0.5VCC
74HCT257 1.3 V 1.3 V
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 10 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Measurement points are given in Table 8 and test data is given in Table 9.
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 resistance.
Fig 8. Test circuit for measuring switching times
9
0
9
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9
9
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U
W
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&&
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RSHQ
*
Table 9. Test data
Type Input Load Switch position
VItr, tfCLRLtPHL, tPLH tPZH, tPHZ tPZL, tPLZ
74HC257 VCC 6 ns 50 pF 1 kopen GND VCC
74HCT257 3 V 6 ns 50 pF 1 kopen GND VCC
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 11 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
12. Package outline
Fig 9. Package outline SOT109-1 (SO16)
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 12 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Fig 10. Package outline SOT338-1 (SSOP16)
81,7 $
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 13 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Fig 11. Package outline SOT403-1 (TSSOP16)
81,7 $
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 14 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
13. Abbreviations
14. Revision history
Table 10. Abbreviations
Acronym Description
CMOS Complementary Metal Oxide Semiconductor
DUT Device Under Test
ESD ElectroStatic Discharge
HBM Human Body Model
MM Machine Model
TTL Transistor-Transistor Logic
Table 11. Revision history
Document ID Release date Data sheet status Change notice Supersedes
74HC_HCT257 v.7 20160202 Product data sheet - 74HC_HCT257 v.6
Modifications: •Type numbers 74HC257N and 74HCT257N (SOT38-4) removed.
74HC_HCT257 v.6 20150126 Product data sheet - 74HC_HCT257 v.5
Modifications: •Table 7: Power dissipation capacitance condition for 74HCT257 is corrected.
74HC_HCT257 v.5 20100113 Product data sheet - 74HC_HCT257 v.4
Modifications: •Table 7: changed 3OE to OE
74HC_HCT257 v.4 20090608 Product data sheet - 74HC_HCT257 v.3
74HC_HCT257 v.3 20050920 Product data sheet - 74HC_HCT257_CNV v.2
74HC_HCT257_CNV v.2 19980930 Product specification - -
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 15 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
15. Legal information
15.1 Data sheet status
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of de vice(s) descr ibed in th is document m ay have cha nged since thi s document w as publish ed and may di ffe r in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nexperia.com.
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Draft — The document is a draft version only. The content is still under
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Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and tit le. A short data sh eet is intended
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full information. For detailed and full informatio n see the relevant full data
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Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if presen t) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — Nexperia
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nexperia.com/profile/terms, unless otherwise
agreed in a valid written individua l agreement. In case an individual
agreement is concluded only the ter m s and conditions of the respective
agreement shall apply. Nexperia hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of Nexperia products by customer.
No offer to sell or license — Nothing i n this document may be interpreted or
construed as an of fer t o sell product s that is open for accept ance or the gr ant,
conveyance or implication of any license under any copyrights, paten ts or
other industrial or intellectual property right s.
Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contains data from the objecti ve specification for product development.
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specification.
Product [short] data sheet Production This document contains the product specification.
© Nexperia B.V. 2017. All rights reserved
74HC_HCT257 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 2 February 2016 16 of 17
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific Nexperia product is automotive qualified,
the product is not suitable for aut omotive use. It i s neither qua lified nor tested
in accordance with automotive testing or application requirements. Nexperia
accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automot ive specifications and standards, custome r
(a) shall use the product without Nexperia's warranty of the
product for such au tomotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
Nexperia's specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies Nexperia for any
liability, damages or failed product claims resulting from custome r design and
use of the product for automotive applications beyond Nexperia's
standard warranty and Nexperia's product specifications.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
15.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respective ow ners.
16. Contact information
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Nexperia 74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
17. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 1
4 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 3
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 Functional description . . . . . . . . . . . . . . . . . . . 4
6.1 Function table. . . . . . . . . . . . . . . . . . . . . . . . . . 4
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 4
8 Recommended operating conditions. . . . . . . . 5
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 5
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 7
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 11
13 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 14
14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 14
15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 15
15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 15
15.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
16 Contact information. . . . . . . . . . . . . . . . . . . . . 16
17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
© Nexperia B.V. 2017. All rights reserved
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release:
02 February 2016
