This data sheet provides details of the IDT54/74FCT138T/AT/CT 1-of-8 decoder. The decoder has three binary weighted inputs (A0, A1, and A2) and, when enabled, provides eight mutually exclusive active LOW outputs (O0-O7). The decoder also has three enable inputs: two active LOW (E1 and E2) and one active HIGH (E3). All outputs will be 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 (5 lines to 32 lines) decoder with just four IDT54/74FCT138T/AT/CT devices and one inverter.
This document is a datasheet for the IDT54/74FCT138T/AT/CT, a fast CMOS 1-of-8 decoder with enable inputs. The device accepts three binary weighted inputs and provides eight mutually exclusive active LOW outputs when enabled. It features true TTL input and output compatibility and is available in various packages including DIP, SOIC, and CERPACK.
| Output High Voltage (Typical) | 3.3V |
|---|---|
| Output Low Voltage (Typical) | 0.3V |
| Input Leakage Current | <1pA |
| Output Sink Current | -15mA |
| Output Source Current | 48mA |
| Operating Temperature (Commercial) | 0°C to +70°C |
| Operating Temperature (Military) | -55°C to +125°C |
| Power Supply Voltage | 5.0V |
It is a 1-of-8 decoder that accepts three binary weighted inputs and provides eight mutually exclusive active LOW outputs when enabled.
The device features three enable inputs: two active LOW (E1, E2) and one active HIGH (E3).
Yes, it has true TTL input and output compatibility.