CY74FCT138T - 1-of-8 Decoder

The \x92FCT138T 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\x96O\₇). The \x92FCT138T 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 \x92FCT138T devices and one inverter.

These devices are fully specified for partial-power-down applications using I_off. The I_off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

Products containing the "CY74FCT138T" keyword are: CY74FCT138TQCT , CY74FCT138TQCT

• 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