Description
The IDT71V321/IDT71V421 are high-speed 2K x 8 Dual-Port Static RAMs with internal interrupt logic for interprocessor communications. The IDT71V321 is designed to be used as a stand-alone 8-bit Dual-Port RAM or as a "MASTER" Dual-Port RAM together with the IDT71V421 "SLAVE" Dual-Port in 16-or-more-bit memory system applications results in full speed, error-free operation without the need for additional discrete logic.

FEATUREs
◆ High-speed access
   – Commercial: 25/35/55ns (max.)
   – Industrial: 25ns (max.)
◆ Low-power operation
   – IDT71V321/IDT71V421S
      — Active: 325mW (typ.)
      — Standby: 5mW (typ.)
   – IDT71V321/V421L
      — Active: 325mW (typ.)
      — Standby: 1mW (typ.)
◆ Two INT flags for port-to-port communications
◆ MASTER IDT71V321 easily expands data bus width to 16-
   or-more-bits using SLAVE IDT71V421
◆ On-chip port arbitration logic (IDT71V321 only)
◆ BUSY output flag on IDT71V321; BUSY input on IDT71V421
◆ Fully asynchronous operation from either port
◆ Battery backup operation—2V data retention (L only)
◆ TTL-compatible, single 3.3V power supply
◆ Available in 52-pin PLCC, 64-pin TQFP and STQFP
   packages
◆ Industrial temperature range (–40°C to +85°C) is available
   for selected speeds