1. General description
The 74HC237 is a h igh-speed Si-gate CMOS device and is pin comp atible 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 74 HC237 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 en able (LE) goes from LOW -to-HIGH, the last da ta pre sent
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 indepen dent of the address inputs or latch operation. All output s are
HIGH unless E1 is LOW and E2 is HIGH. The 74HC237 is ideally suited for implementing
non-overlapping decode rs in 3-st ate systems and strobes ( stored address) applications in
bus-oriented systems.
2. Features and benefits
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
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exce ed s 200 V
Multiple package options
Specified from 40 Cto+85C and from 40 Cto+125C
3. Ordering information
74HC237
3-to-8 line decoder, demultiplexer with address latches
Rev. 7 — 29 January 2016 Product data sheet
Table 1. Ordering information
Type number Package
Temper atu re range Name Description Version
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
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74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 2 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
4. Functional diagram
Fig 1. Functional di agram
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© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 3 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
5. Pinning information
5.1 Pinning
Fig 4. Logic diag ram
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© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 4 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
5.2 Pin description
6. Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
Table 2. Pin description
Symbol Pin Description
A0 to A2 1, 2, 3 data input
LE 4 latch enable input (active LOW)
E1 5 data enable input 1 (active LOW)
E2 6 data enable input 2 (active HIGH)
Y0 to Y7 15, 14, 13, 12, 11, 10, 9, 7 output
GND 8 ground (0 V)
VCC 16 supply voltage
Table 3. Function table
Enable Input Output
LE E1 E2 A0 A1 A2 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
HLHXXXstable
XHXXXXLLLLLLLL
XXLXXXLLLLLLLL
LLHLLLHLLLLLLL
HLLLHLLLLLL
LHLLLHLLLLL
HHLLLLHLLLL
LLHLLLLHLLL
HLHLLLLLHLL
LHHLLLLLLHL
HHHLLLLLLLH
© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 5 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
7. Limiting values
[1] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
For SSOP16 package: Ptot derates linearly w ith 5.5 mW/K above 60 C.
8. Recommended operating conditions
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 - 20 mA
IOK output clamping current VO<0.5 V or VO>V
CC +0.5V - 20 mA
IOoutput current VO = 0.5 V to (VCC +0.5V) - 25 mA
ICC supply current - +50 mA
IGND ground current - 50 mA
Tstg storage temperature 65 +150 C
Ptot total power dissipation SO16 and SSOP16 packages [1] - 500 mW
Table 5. Recommended operating con ditions
Voltages are referenced to GND (ground = 0 V)
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
Tamb ambient temperature 40 +25 +125 C
t/V input transition rise and fall rate VCC = 2.0 V - - 625 ns/V
VCC = 4.5 V - 1.67 139 ns/V
VCC = 6.0 V - - 83 ns/V
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74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 6 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
9. Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C to
+85 CTamb = 40 C to
+125 CUnit
Min Typ Max Min Max Min Max
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=4.0 mA; VCC = 4.5 V 3.98 4.32 - 3.84 - 3.7 - V
IO=5.2 mA; VCC = 6.0 V 5.48 5.81 - 5.34 - 5.2 - V
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= 4.0 mA; VCC = 4.5 V - 0.15 0.26 - 0.33 - 0.4 V
IO= 5.2 mA; VCC = 6.0 V - 0.16 0.26 - 0.33 - 0.4 V
IIinput leakage
current VI=V
CC or GND;
VCC =6.0V --0.1 - 1.0 - 1.0 A
ICC supply current VI=V
CC or GND; IO=0A;
VCC =6.0V - - 8.0 - 80 - 160 A
CIinput
capacitance -3.5- - - - -pF
© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 7 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 10.
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C
to +85 CTamb = 40 C
to +125 CUnit
Min Typ Max Min Max Min Max
tpd propagation
delay An to Yn; see Figure 7 [1]
VCC = 2.0 V - 52 160 - 200 - 240 ns
VCC = 4.5 V - 19 32 - 40 - 48 ns
VCC =5V; C
L=15pF - 16 - - - - - ns
VCC = 6.0 V - 15 27 - 34 - 41 ns
LE to Yn; see Figure 7 [1]
VCC = 2.0 V - 61 190 - 240 - 285 ns
VCC = 4.5 V - 22 38 - 48 - 57 ns
VCC =5V; C
L=15pF - 19 - - - - - ns
VCC = 6.0 V - 18 32 - 41 - 48 ns
E1to Yn; see Figure 8 [1]
VCC = 2.0 V - 47 145 - 180 - 220 ns
VCC = 4.5 V - 17 29 - 36 - 44 ns
VCC =5V; C
L=15pF - 14 - - - - - ns
VCC = 6.0 V - 14 25 - 31 - 38 ns
E2 to Yn; see Figure 7 [1]
VCC = 2.0 V - 47 145 - 180 - 220 ns
VCC = 4.5 V - 17 29 - 36 - 44 ns
VCC =5V; C
L=15pF - 14 - - - - - ns
VCC = 6.0 V - 14 25 - 31 - 38 ns
tttransition
time Yn; see Figure 7 and
Figure 8 [2]
VCC = 2.0 V - 19 75 - 95 - 110 ns
VCC = 4.5 V - 7 15 - 19 - 22 ns
VCC = 6.0 V - 6 13 - 16 - 19 ns
tWpulse width LE HIGH; see Figure 9
VCC = 2.0 V 50 11 - 65 - 75 - ns
VCC = 4.5 V 10 4 - 13 - 15 - ns
VCC = 6.0 V 9 3 - 11 - 13 - ns
tsu set-up time An to LE; see Figure 9
VCC = 2.0 V 50 6 - 65 - 75 - ns
VCC = 4.5 V 10 2 - 13 - 15 - ns
VCC = 6.0 V 9 2 - 11 - 13 - ns
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74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 8 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
[1] tpd is the same as tPLH and tPHL.
[2] tt is the same as tTHL and tTLH.
[3] 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;
(CLVCC2fo) = sum of outputs.
11. Waveforms
thhold time An to LE; see Figure 9 -
VCC = 2.0 V 30 3 - 40 - 45 - ns
VCC = 4.5 V 6 1 - 8 - 9 - ns
VCC = 6.0 V 5 1 - 7 - 8 - ns
CPD power
dissipation
capacitance
CL=50pF;f=1 MHz;
VI=GNDtoV
CC
[3] -60- - - - -pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 10.
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C
to +85 CTamb = 40 C
to +125 CUnit
Min Typ Max Min Max Min Max
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7. Propagation delay input (An) and enable inputs (E2, LE) to output (Yn) and output transition time
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74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 9 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 8. Propagation enable inputs (E1) to output (Yn) and output transition time
DDE
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W7+/ W7/+
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Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 9. The data input (An) to latch enable input (LE) set-up times, latch enable input (LE) to dat a input (An) hold
times and latch enable input (LE) pulse width
W
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Table 8. Measurement points
Type Input Output
VMVM
74HC237 0.5VCC 0.5VCC
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74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 10 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
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.
S1 = Test selection switch.
Fig 10. Test circuit for measuring switching times
DDK
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W:
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Type Input Load Test
VItr, tfCL
74HC237 VCC 6.0 ns 15 pF, 50 pF tPLH, tPHL
© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 11 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
12. Application information
Fig 11. 6-to-64 line decoder with input address storage
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© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 12 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
13. Package outline
Fig 12. Package outline SOT109-1 (SO16)
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© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 13 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
Fig 13. Package outline SOT338-1 (SSOP16)
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© Nexperia B.V. 2017. All rights reserved
74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 14 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
14. Abbreviations
15. 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
74HC237 v.7 20160129 Product data sheet - 74HC237 v.6
Modifications: •Type number 74HC237N removed.
74HC237 v.6 20120823 Product data sheet - 74HC237 v.5
Modifications: •Measurement points added to Figure 7 and Figure 8 (errata).
74HC237 v.5 20111209 P roduct data sheet - 74HC237 v.4
Modifications: •Legal pages updated.
74HC237 v.4 20110110 P roduct data sheet - 74HC237 v.3
74HC237 v.3 20041112 Product data sheet - 74HC_HCT237_CNV v.2
74HC_HCT237_CNV v.2 19970828 Product specification - 74HC_HCT237 v.1
74HC_HCT237 v.1 19901201 Product specification - -
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74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 15 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
16. Legal information
16.1 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.
16.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any
representations or warrant ies as to t he accuracy or completeness of
information included herein and shall have no liab ility for the consequences of
use of such information.
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
for quick reference only and shou ld not b e relied u pon to cont ain det ailed and
full information. For detailed and full informatio n see the relevant full data
sheet, which is available on request via the local Nexperia sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall pre va il.
Product specificat ion — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
Nexperia and its customer, unless Nexperia and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the Nexperia product is
deemed to off er functions and qualities beyond those described in the
Product data sheet.
16.3 Disclaimers
Limited warr a nty and liability — Information in this document is believed to
be accurate and reliable. However, Nexperia does not give any
representations or warrant ies, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. Nexperia takes no
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In no event shall Nexperia be liable for any indirect, incidental,
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Notwithstanding any damages that customer might incur for any reason
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Right to make changes — Nexperia reserves the right to make
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Applications — Applications that are described herein for any of these
products are for illustrative purposes only. Nexperia makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using Nexperia products, and Nexperia
accepts no liability for any assistance with applications or customer product
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Nexperia does not accept any liability related to any default,
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customer’s applications or products, or the application or use by customer’s
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the products or of the application or use by customer’s third party
customer(s). Nexperia does not accept any liability in this respect.
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
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Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contain s data from the objective 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.
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74HC237 All information provided in this document is subject to legal disclaimers. .
Product data sheet Rev. 7 — 29 January 2016 16 of 17
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
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Non-automotive qualified products — Unless this data sheet expressly
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the product is not suitable for aut omotive use. It i s neither qua lified nor tested
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In the event that customer uses the product for design-in and use in
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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.
16.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respective ow ners.
17. Contact information
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Nexperia 74HC237
3-to-8 line decoder, demultiplexer with address latches
18. 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
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5
8 Recommended operating conditions. . . . . . . . 5
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 6
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 7
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
12 Application information. . . . . . . . . . . . . . . . . . 11
13 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 12
14 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 14
15 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 14
16 Legal information. . . . . . . . . . . . . . . . . . . . . . . 15
16.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 15
16.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
16.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
16.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
17 Contact information. . . . . . . . . . . . . . . . . . . . . 16
18 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:
29 January 2016
