Instrukcja obsługi Texas Instruments SN74HC138D

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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 NUMBERPACKAGE(1) BODY SIZE (NOM)

SN74HC138DSOIC (16)9.90 mm x 3.90 mm

SN74HC138DBSSOP (16)6.20 mm x 5.30 mm

SN74HC138NPDIP (16)19.32 mm x 6.35 mm

SN74HC138NSSO (16)10.20 mm x 5.30 mm

SN74HC138PWTSSOP (16)5.00 mm x 4.40 mm

SN54HC138JCDIP (16)21.34 mm x 6.92 mm

SN54HC138WCFP (16)10.16 mm x 6.73 mm

SN54HC138FKLCCC (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.

Specyfikacje produktu