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1 Features

? Wide operating range of 1.65V to 5.5V

? 5.5V tolerant input pins

? Single-supply voltage translator (refer to LVxT

Enhanced Input Voltage):

– Up translation:

? 1.2V to 1.8V

? 1.5V to 2.5V

? 1.8V to 3.3V

? 3.3V to 5.0V

– Down translation:

? 5.0V, 3.3V, 2.5V to 1.8V

? 5.0V, 3.3V to 2.5V

? 5.0V to 3.3V

? Up to 150Mbps with 5V or 3.3V VCC

? Supports standard function pinout

? Latch-up performance exceeds 250mA

per JESD 17

? Supports defense and aerospace applications:

– Controlled baseline

– One assembly and test site

– One fabrication site

– Extended product life cycle

– Product traceability

2 Applications

? Enable or disable a digital signal

? Controlling an indicator LED

? Translation between communication modules and

system controllers

3 Description

The SN74LV8T138-EP is a three to eight decoder

with one standard output strobe (G2) and two active

low output strobes (G 1 and G 0). When the outputs

are gated by any of the strobe inputs, they are all

forced into the high state. When the outputs are not

disabled by the strobe inputs, only the selected output

is low while all others are high. The output level is

referenced to the supply voltage (VCC) and supports

1.8V, 2.5V, 3.3V, and 5V CMOS levels.

The input is designed with a lower threshold circuit to

support up translation for lower voltage CMOS inputs

(for example, 1.2V input to 1.8V output or 1.8V input

to 3.3V output). In addition, the 5V tolerant input pins

enable down translation (for example, 3.3V to 2.5V

output).