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SNx4HC138 3-Line To 8-Line Decoders/Demultiplexers

1 Features

• Targeted Specifically for High-Speed Memory

Decoders and Data-Transmission Systems

• Wide Operating Voltage Range (2 V to 6 V)

• Outputs Can Drive Up To 10 LSTTL Loads

• Low Power Consumption, 80-µA Maximum ICC

• Typical tpd = 15 ns

• ±4-mA Output Drive at 5 V

• Low Input Current of 1-µA Maximum

• Active Low Outputs ( Selected Output is Low)

• Incorporate Three Enable Inputs to Simplify

Cascading or Data Reception

2 Applications

• LED Displays

• Servers

• White Goods

• Power Infrastructure

• Building Automation

• Factory Automation

3 Description

The SNx4HC138 devices are designed to be used

in high-performance memory-decoding or data-routing

applications requiring very short propagation delay

times. In high-performance memory systems, these

decoders can be used to minimize the effects of

system decoding. When employed with high-speed

memories using a fast enable circuit, the delay times

of these decoders and the enable time of the memory

are usually less than the typical access time of the

memory. This means that the effective system delay

introduced by the decoders is negligible.

Device Information

PART NUMBER PACKAGE(1) BODY SIZE (NOM)

SN74HC138D SOIC (16) 9.90 mm x 3.90 mm

SN74HC138DB SSOP (16) 6.20 mm x 5.30 mm

SN74HC138N PDIP (16) 19.32 mm x 6.35 mm

SN74HC138NS SO (16) 10.20 mm x 5.30 mm

SN74HC138PW TSSOP (16) 5.00 mm x 4.40 mm

SN54HC138J CDIP (16) 21.34 mm x 6.92 mm

SN54HC138W CFP (16) 10.16 mm x 6.73 mm

SN54HC138FK LCCC (20) 8.89 mm x 8.89 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.

Functional Block DIagram

SN54HC138, SN74HC138

SCLS107G – DECEMBER 1982 – REVISED OCTOBER 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Table of Contents

1 Features............................................................................1

2 Applications..................................................................... 1

3 Description.......................................................................1

4 Revision History.............................................................. 2

5 Pin Configuration and Functions...................................3

Pin Functions.................................................................... 3

6 Specifications.................................................................. 4

6.1 Absolute Maximum Ratings........................................ 4

6.2 ESD Ratings: SN74HC138......................................... 4

6.3 Recommended Operating Conditions.........................4

6.4 Thermal Information: SN74HC138..............................5

6.5 Thermal Information: SN54HC138..............................5

6.6 Electrical Characteristics.............................................5

6.7 Electrical Characteristics: SN74HC138...................... 6

6.8 Electrical Characteristics: SN54HC138...................... 6

6.9 Switching Characteristics............................................6

6.10 Switching Characteristics: SN74HC138....................7

6.11 Switching Characteristics: SN54HC138....................7

6.12 Typical Characteristic................................................7

7 Parameter Measurement Information............................ 8

8 Detailed Description........................................................9

8.1 Overview.....................................................................9

8.2 Functional Block Diagram........................................... 9

8.3 Feature Description.....................................................9

8.4 Device Functional Modes..........................................10

9 Application and Implementation.................................. 11

9.1 Application Information..............................................11

9.2 Typical Application.................................................... 11

10 Power Supply Recommendations..............................12

11 Layout........................................................................... 12

11.1 Layout Guidelines................................................... 12

11.2 Layout Example...................................................... 12

12 Device and Documentation Support..........................13

12.1 Documentation Support.......................................... 13

12.2 Related Links.......................................................... 13

12.3 Receiving Notification of Documentation Updates..13

12.4 Support Resources................................................. 13

12.5 Trademarks............................................................. 13

12.6 Electrostatic Discharge Caution..............................13

12.7 Glossary..................................................................13

13 Mechanical, Packaging, and Orderable

Information.................................................................... 13

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (September 2003) to Revision F (September 2016) Page

• Added table, section, , ESD Ratings Feature Description Device Functional Modes Application and

Implementation Power Supply Recommendations Layout Device and section, section, section,

Documentation Support Mechanical, Packaging, and Orderable Information section, and section................... 1

• Deleted Ordering Information table; see POA at the end of the data sheet....................................................... 1

• Changed RθJA values from 73 to 87.3 (D), from 82 to 104.3 (DB), from 67 to 54.8 (N), from 64 to 91.1 (NS),

and from 108 to 114.6 (PW)................................................................................................................................5

Changes from Revision F (September 2016) to Revision G (October 2021) Page

• Updated the ESD ratings table to fit modern data sheet standards....................................................................4

SN54HC138, SN74HC138

SCLS107G – DECEMBER 1982 – REVISED OCTOBER 2021 www.ti.com

Product Folder Links: SN54HC138 SN74HC138

5 Pin Configuration and Functions

SOIC, SSOP, PDIP, SO, TSSOP, CDIP, or CFP

Package

16-Pin D, DB, N, NS, PW, J or W

Top View

NC: No internal connection

LCCC Package

20-Pin FK

Top View

Pin Functions

I/O(1) DESCRIPTION

NAME SOIC, SSOP, PDIP, SO,

TSSOP, CDIP, CFP LCCC

A 1 2 I Select input A (least significant bit)

B 2 3 I Select input B

C 3 4 I Select input C (most significant bit)

G2A 4 5 I Active low enable A

G2B 5 7 I Active low enable B

G1 6 8 I Active high enable

GND 8 10 — Ground

NC — 1, 6, 11, 16 — No internal connection

VCC 16 20 — Supply voltage

Y0 15 19 O Output 0 (least significant bit)

Y1 14 18 O Output 1

Y2 13 17 O Output 2

Y3 12 15 O Output 3

Y4 11 14 O Output 4

Y5 10 13 O Output 5

Y6 9 12 O Output 6

Y7 7 9 O Output 7 (most significant bit)

(1) Signal Types: I = Input, O = Output, I/O = Input or Output.

www.ti.com

SN54HC138, SN74HC138

SCLS107G – DECEMBER 1982 – REVISED OCTOBER 2021

Product Folder Links: SN54HC138 SN74HC138

Produktspecifikationer

Varumärke:	Texas Instruments
Kategori:	Inte kategoriserad
Modell:	SN74HC138D
Färg på produkten:	Grijs
Bredd:	223 mm
Djup:	74 mm
Höjd:	130 mm
Förpackningens vikt:	1800 g
Förpackningens bredd:	310 mm
Djuppackning:	115 mm
Förpackningshöjd:	175 mm
Husmaterial:	Aluminium
Färg:	Ja
Internationell säkerhetskod (IP):	IP65
Skärm diagonal:	- "
Stemcodecs:	G.711a, G.711u, G.722, G.723.1, G.726-32, G.729ab
Anslutningsteknik:	Bedraad
Minimal belysning:	0.001 Lux
Betraktningsvinkel, horisontell:	115 °
Betraktningsvinkel, vertikal:	87 °
Högtalare:	Ja
Antal Ethernet LAN (RJ-45)-portar:	1
Inbyggda högtalare:	Ja
Antal högtalare:	1
Optisk sensorstorlek:	1/3 "
Bildsensortyp:	CMOS
Maximal videoupplösning:	1280 x 960 Pixels
Inbyggd mikrofon:	Ja
Ethernet LAN, dataöverföringshastigheter:	10, 100 Mbit/s
Kabelteknik:	10/100Base-T(X)
Nätverksstandard:	IEEE 802.3af
Nätverksprotokoll som stöds:	RTSP, SNTP, VPN L2PT/openVPN, SRTP, HTTP/HTTPS, DHCP, PPPoE, STUN
Webbaserad hantering:	Ja
Ethernet-gränssnittstyp:	Fast Ethernet
Upphängningssystem för väggen:	Ja
Power over Ethernet (PoE):	Ja
Jag kodar:	IK10
Utedel ingår:	Ja
Power högtalare:	3 W
Förvaltningsprotokoll:	FTP / TFTP / HTTP / HTTPS / DHCP / TR069 / SIP PNP
(Ytter) huvudpaketets höjd:	370 mm
(Ytter) huvudförpackningens bredd:	370 mm
(Ytre) huvudpaketets längd:	330 mm
Kvantitet per (yttre) huvudkartong:	6 stuk(s)
Drifttemperatur (TT):	-40 - 70 °C
Relativ luftfuktighet i drift (VV):	10 - 90 procent
Streaming alternativ:	Ja
Avstängning av ultraljud:	Ja
Video-codecs:	H.264
Reläs ingång:	1