CD54AC138F3A ,3-to-8-Line Decoder/Demultiplexer Inverting CD54AC138, CD74AC138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SCHS328A – JANUARY 2003 – REVISED FE ..
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CD54AC138F3A
3-to-8-Line Decoder/Demultiplexer Inverting
Designed Specifically for High-SpeedMemory Decoders and Data-Transmission
Systems Incorporate Three Enable Inputs to Simplify
Cascading and/or Data Reception Balanced Propagation Delays ±24-mA Output Drive Current
– Fanout to 15 F Devices SCR-Latchup-Resistant CMOS Process and
Circuit Design Exceeds 2-kV ESD Protection Per
MIL-STD-883, Method 3015
description/ordering informationThe ’AC138 decoders/demultiplexers are designed for high-performance memory-decoding and data-routing
applications that require 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
utilizing a fast enable circuit, the delay times of these decoders 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
decoders 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 (see Application
Information).
ORDERING INFORMATION Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
G2A
G2B
GND
