Description

The IDT70121/IDT70125 are high-speed 2K x 9 Dual-Port Static RAMs. The IDT70121 is designed to be used as a stand-alone 9-bit Dual- Port RAM or as a “MASTER” Dual-Port RAM together with the IDT70125 “SLAVE” Dual-Port in 18-bit-or-more word width systems. Using the IDT MASTER/SLAVE Dual-Port RAM approach in 18-bit-or-wider 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: 35ns (max.)

◆ Low-power operation

– IDT70121/70125S

Active: 675mW (typ.)

Standby: 5mW (typ.)

– IDT70121/70125L

Active: 675mW (typ.)

Standby: 1mW (typ.)

◆ Fully asychronous operation from either port

◆ MASTER IDT70121 easily expands data bus width to 18 bits or

more using SLAVE IDT70125 chip

◆ On-chip port arbitration logic (IDT70121 only)

◆ BUSY output flag on Master; BUSY input on Slave

◆ INT flag for port-to-port communication

◆ Battery backup operation—2V data retention

◆ TTL-compatible, signal 5V (±10) power supply

◆ Available in 52-pin PLCC

◆ Industrial temperature range (–40°C to +85°C) is available for

selected speeds

◆ Green parts available, see ordering information