MC74HC244A Octal 3−State Noninverting Buffer/Line Driver/ Line Receiver
The MC74HC244A is an octal 3‑state non‑inverting buffer/line driver/receiver compatible with LS244 pinout. It is intended for use in bus‑oriented systems such as memory address drivers and clock drivers, offering 15 LSTTL load output capability and direct interfacing to CMOS, NMOS, and TTL.
The document provides detailed electrical characteristics, maximum ratings, package dimensions for PDIP‑20, SOIC‑20, TSSOP‑20 and SOEIAJ‑20, pin assignments, ordering information, and recommended operating conditions.
| Output Drive Capability | 15 LSTTL Loads |
|---|---|
| Operating Voltage Range | 2.0 V to 6.0 V |
| Input Current per Pin | +20 mA |
| Output Current per Pin | +35 mA |
| Power Dissipation (Plastic DIP) | 750 mW |
| Power Dissipation (SOIC) | 500 mW |
| Power Dissipation (TSSOP) | 450 mW |
The MC74HC244A is identical in pinout to the LS244.
The recommended operating supply voltage is 2.0 V to 6.0 V.
It can drive up to 15 LSTTL loads.
Maximum input current per pin is +20 mA and maximum output current per pin is +35 mA.