CY74FCT138T

Features:

`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


Pinout




Specifications

Supply voltage range to ground potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 V to 7 V
DC input voltage rang. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .0.5 V to 7 V
DC output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
DC output current (maximum sink current/pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .120 mA
Package thermal impedance, JA (see Note 1): Q package . . . . . . . . . . . . . . . . . . . . . . . . .90°C/W
SO package . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57°C/W
Ambient temperature range with power applied, TA . . . . . . . . . . . . . . . . . .  . . . .65°C to 135°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65°C to 150°C


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 (O0O7). 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.
FCT138T 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.