The HD6321/HD6821 Peripheral Interface Adapter (PIA) from Hitachi offers two 8‑bit bi‑directional data buses and four programmable control lines, allowing flexible interfacing of peripheral devices to a microprocessing unit. The device operates from a 5 V supply (±10%) and is available in CMOS and NMOS versions.
The document includes sections on features, absolute maximum ratings, recommended operating conditions, pin arrangement, block diagram, DC and AC electrical characteristics, peripheral and bus timing diagrams, programming summaries, and a compatibility note between the CMOS and NMOS versions.
| Maximum Output Current (per pin) | 10 mA |
|---|
Each output pin can source or sink up to 10 mA.
Yes, the HD6321 CMOS version is compatible with the NMOS PIA HD6821.