70V657 - Renesas

70V657 DUAL-PORT STATIC RAM

The IDT70V659/58/57 is a high-speed 128/64/32K x 36 Asynchronous Dual-Port Static RAM. The IDT70V659/58/57 is designed to be used as a stand-alone 4/2/1Mbit Dual-Port RAM or as a combination MASTER/ SLAVE Dual-Port RAM for 72-bit-or-more word system. Using the MASTER/SLAVE Dual-Port RAM approach in 72-bit or wider memory system applications results in full-s.

Features

◆ True Dual-Port memory cells which allow simultaneous access of the same memory location ◆ High-speed access
  – Commercial: 10/12/15ns (max.)
  – Industrial: 12ns (max.) ◆ Dual chip enables allow for depth expansion without external logic ◆ IDT70V659/58/57 easily expands data bus width to 72 bits or more using the Master/Slave select when cascading more than one device ◆ M/S = VIH for BUSY output flag on Master, M/S = VIL for BUSY input on Slave ◆ Busy and Interrupt Flags ◆ On-chip port arbitration logic ◆ Full on-chip hardware support of semaphore signaling between ports ◆ Fully asynchronous o.