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CY74FCT138ATQCTTIN/a50avai1-of-8 Decoder
CY74FCT138ATSOCTIN/a100avai1-of-8 Decoder
CY74FCT138CTSOCCYPRESSN/a9avai1-of-8 Decoder


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CY74FCT138ATQCT-CY74FCT138ATSOC-CY74FCT138CTSOC
1-of-8 Decoder
Significantly Improved Noise
Characteristics
Ioff Supports Partial-Power-Down Mode
Operation
Matched Rise and Fall Times Fully Compatible With TTL Input and
Output Logic Levels
Dual 1-of-8 Decoder With Enables ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
CY54FCT138T
– 32-mA Output Sink Current
– 12-mA Output Source Current
CY74FCT138T
– 64-mA Output Sink Current
– 32-mA Output Source Current
description

The ’FCT138T devices are 1-of-8 decoders. These devices accept three binary weighted inputs (A0, A1, A2)
and, when enabled, provide eight mutually exclusive active-low outputs (O0–O7). The ’FCT138T devices
feature three enable inputs: two active low (E1, E2) and one active high (E3).
All outputs are high unless E1 and E2 are low and E3 is high. This multiple-enable function allows easy parallel
expansion of the device to a 1-of-32 (five lines to 32 lines) decoder with just four ’FCT138T devices and one
inverter.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered down.
PIN DESCRIPTION

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.
GND6233 NCV
GND
CY54FCT138T... L PACKAGE
(TOP VIEW)

NC – No internal connection
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