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1FEATURES

· Qualified for Automotive Applications

· ESD Protection Exceeds 2000 V Per

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

· Operates From 2 V to 3.6 V

· Inputs Accept Voltages to 5.5 V

· Max tpd of 5.8 ns at 3.3 V

· Typical VOLP (Output Ground Bounce) < 0.8 V

at VCC = 3.3 V, TA = 25°C

· Typical VOHV (Output VOH Undershoot) > 2 V

at VCC = 3.3 V, TA = 25°C

DESCRIPTION/ORDERING INFORMATION

The SN74LVC138A 3-line to 8-line decoder/demultiplexer is designed for 2.7-V to 3.6-V VCC operation.

The device is designed for high-performance memory-decoding or data-routing applications requiring very short

propagation delay times. In high-performance memory systems, this decoder minimizes the effects of system

decoding. When employed with high-speed memories utilizing a fast enable circuit, 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 enable inputs and one active-high enable input 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.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in

a mixed 3.3-V/5-V system environment.