1.

General description

The 74HC238; 74HCT238 decodes three binary weighted address inputs (A0, A1 and A2)

to eight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs

(E1 and E2 and E3). Every output will be LOW unless E1 and E2 are LOW and E3 is

HIGH. This multiple enable function allows easy parallel expansion to a 1-of-32 (5 to 32

lines) decoder with just four '238 ICs and one inverter. The '238 can be used as an eight

output demultiplexer by using one of the active LOW enable inputs as the data input and

the remaining enable inputs as strobes. 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

 Demultiplexing capability

 Multiple input enable for easy expansion

 Ideal for memory chip select decoding

 Active HIGH mutually exclusive outputs

 Multiple package options

 Complies with JEDEC standard no. 7A

 Input levels:

 For 74HC238: CMOS level

 For 74HCT238: TTL level

 ESD protection:

 HBM JESD22-A114F exceeds 2000 V

 MM JESD22-A115-A exceeds 200 V

 Specified from

40 Cto+85 C and from 40 Cto+125 C

3.

Ordering information

74HC238; 74HCT238

3-to-8 line decoder/demultiplexer

Rev. 4 — 27 January 2016

Product data sheet

Table 1.

Ordering information

Type number

Package

Temperature range

Name

Description

Version

74HC238D

40 C to +125 C

SO16

plastic small outline package; 16 leads;

body width 3.9 mm

SOT109-1

74HCT238D

74HC238DB

40 C to +125 C

SSOP16

plastic shrink small outline package; 16 leads;

body width 5.3 mm

SOT338-1

74HCT238DB