3ĆLINE TO 8ĆLINE DECODER/DEMULTIPLEXER
D Qualified for Automotive Applications
D EPIC (Enhanced-Performance Implanted
D Inputs Are TTL-Voltage Compatible
D Designed Specifically for High-Speed
Memory Decoders and Data-Transmission
D Incorporates Three Enable Inputs to
Simplify Cascading and/or Data Reception
D Latch-Up Performance Exceeds 250 mA Per
D ESD Protection Exceeds 2000 V Per
MIL-STD-833, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
SGDS022A − FEBRUARY 2002 − REVISED APRIL 2008
D OR PW PACKAGE
The SN74AHCT138Q 3-line to 8-line decoder/demultiplexer is designed to be used in high-performance
memory-decoding and data-routing applications that require very short propagation-delay times. In
high-performance memory systems, this decoder can be used to minimize the effects of system decoding.
When employed with high-speed memories utilizing a fast enable circuit, the delay times of this decoder and
the enable time of the memory usually are less than the typical access time of the memory. This means that
the effective system delay introduced by the decoder is negligible.
The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two
active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding.
A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one
inverter. An enable input can be used as a data input for demultiplexing applications.
SOIC − D
−40°C to 125°C
TSSOP − PW
Tape and reel
Tape and reel
† For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or see the TI web site at http://www.ti.com.
‡ Package drawings, thermal data, and symbolization are available at http://www.ti.com/packaging.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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