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CYM1946 Datasheet

Part Number CYM1946
Manufacturers Cypress Semiconductor
Logo Cypress Semiconductor
Description 512K x 32 Static RAM Module
Datasheet CYM1946 DatasheetCYM1946 Datasheet (PDF)

946 CYM1946 Features • High-density 16-megabit SRAM module • 32-bit Standard Footprint supports densities from 16K x 32 through 1M x 32 • High-speed SRAMs — Access time of 35 ns • Low active power — 7.3W (max.) at 35ns • Compatible with CYM1821, CYM1831, CYM1836, CYM1841, and CYM1851 JDEC Modules Functional Description The CYM1946 is a high-performance 16-megabit static RAM module organized as 512K words by 32 bits. This module is 512K x 32 Static RAM Module constructed from 16 128K x 8 SRAMs.

  CYM1946   CYM1946






512K x 32 Static RAM Module

946 CYM1946 Features • High-density 16-megabit SRAM module • 32-bit Standard Footprint supports densities from 16K x 32 through 1M x 32 • High-speed SRAMs — Access time of 35 ns • Low active power — 7.3W (max.) at 35ns • Compatible with CYM1821, CYM1831, CYM1836, CYM1841, and CYM1851 JDEC Modules Functional Description The CYM1946 is a high-performance 16-megabit static RAM module organized as 512K words by 32 bits. This module is 512K x 32 Static RAM Module constructed from 16 128K x 8 SRAMs in SOJ packages mounted on an epoxy laminate substrate. Four chip selects are used to independently enable the four bytes. Reading or writing can be executed on individual bytes or any combination of multiple bytes through proper use of selects. The CYM1946 is designed for use with standard 72-pin SIMM sockets. The pinout is downward compatible with the 64-pin JEDEC ZIP/SIMM module family (CYM1821, CYM1831, CYM1836, and CYM1841). Thus, a single motherboard design can be used to accommodate memory depth ranging from 16K words (CYM1821) to 1,024K words (CYM1851). Presence detect pins (PD0–PD3) are used to identify module memory density in applications where modules with alternate word depths can be interchanged. Logic Block Diagram A0 – A16 OE WE 17 CS1 A17 A18 A0 – A16 1–4 Decoder 17 CS2 A17 A18 1–4 Decoder A0 – A16 17 CS3 A17 A18 1–4 De- coder A0 – A16 17 CS4 A17 A18 1–4 De- coder 128Kx8 SRAM 128Kx8 SRAM 128Kx8 SRAM 128Kx8 SRAM 128Kx8 SRAM 128Kx8 SRAM 128Kx8 SRAM 128Kx.


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