This document introduces IDT70V631S, a high-speed, low-power 3.3V 256K x 18 asynchronous dual-port static RAM. It features fully asynchronous operation, support for JTAG, and is available in a variety of packages for use in industrial temperatures (-40°C to +85°C).
The IDT70V631S is a high-speed 256K x 18 Asynchronous Dual-Port Static RAM designed for use as a stand-alone 4608K-bit Dual-Port RAM or as a MASTER/SLAVE configuration for 36-bit or wider word systems. It features true dual-port memory cells allowing simultaneous access to the same location and includes on-chip port arbitration logic with full hardware support for semaphore signaling.
The device operates from a single 3.3V power supply for the core, with selectable 3.3V or 2.5V supplies for I/Os and control signals on each port via OPT pins. It is available in 128-pin TQFP, 208-ball BGA, and 256-ball BGA packages. Industrial temperature range (-40°C to +85°C) options are available for selected speeds.
| Capacity | 256K x 18 |
|---|---|
| Access Time (Commercial) | 10/12/15ns |
| Access Time (Industrial) | 12ns |
| Package Types | 128-pin TQFP, 208-ball BGA, 256-ball BGA |
| Temperature Range (Industrial) | -40°C to +85°C |
Yes, using the Master/Slave select feature allows data bus width expansion to 36 bits or more by cascading devices.
Yes, it supports IEEE 1149.1 compliant JTAG features, except on the 128-pin TQFP package due to limited pin count.
The OPT pins control whether each port operates at 3.3V or 2.5V, while the core remains at 3.3V.