The SN74AHCT245 and SN54AHCT245 are octal bus transceivers designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. The ’AHCT245 devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses effectively are isolated.
The SN54AHCT245 is an octal bus transceiver with 3‑state outputs designed for asynchronous two‑way communication between data buses. It supports TTL‑compatible inputs and includes a direction‑control (DIR) pin and an output‑enable (OE) pin for bus isolation.
The document provides ordering information, electrical characteristics, recommended operating conditions, package thermal data, and a detailed package option addendum. It also contains mechanical drawings and an important notice about product warranties and availability.
| Package thermal impedance – RGY | 37 °C/W |
|---|---|
| Package thermal impedance – DB | 70 °C/W |
OE should be tied to VCC through a pull‑up resistor to ensure a high‑impedance state.
Inputs are TTL‑voltage compatible, typically from –0.5 V to VCC + 0.5 V.