Decoder/Demultiplexer Single 3-to-8 16-Pin SOIC T/R

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 (O\0-O\7). The "FCT138T devices feature three enable inputs: two active low (E\1, E\2) and one active high (E3 ). All outputs are high unless E\1 and E\2 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.

Function, Pinout, and Drive Compatible With FCT and F Logic

Reduced V_OH (Typically = 3.3 V) Versions of Equivalent FCT Functions

Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics

I_off 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