EDI8F32259C

Features:

256Kx32 bit CMOS Static RAM
  Access Times: 15, 20, and 25ns
  Individual Byte Selects
  Fully Static, No Clocks
  TTL Compatible I/O
High Density Package with JEDEC Standard Pinouts
  72 Pin SIMM No. 175 (Angle)
  72 Pin ZIP No. 176
  72 Pin SIMM, No. 354 (Straight)
Single +5V (±10%) Supply Operation


Pinout




Specifications

Parameter	Maximum Ratings
Voltage on any pin relative to VSS	-0.5V to 7.0V
Operating Temperature TA (Ambient) Commercial Industrial	0°C to +70°C -40°C to +85°C
Storage Temperature, Plastic	-55°C to +125°C
Power Dissipation	8.0 Watt
Output Current	20 mA

*Stress greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions greater than those indicated in the operational sections of this specifi cation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.


Description

The EDI8F32259C is a high speed 8Mb Static RAM module organized as 256K words by 32 bits. This module is constructed from eight 256Kx4 Static RAMs in SOJ packages on an epoxy laminate (FR4) board.

Four chip enables (EØ# - E3#) 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 EDI8F32259C is offered in 72 pin ZIP/SIMM package which enables eight megabits of memory to be placed in less than 1.3 square inches of board space.

All inputs and outputs are TTL compatible and operate from a single 5V supply. Fully asynchronous circuitry requires no clocks or refreshing for operation and provides equal access and cycle times for ease of use.

The ZIP and SIMM modules contain four PD (Presence Detect) pins which are used to identify module memory density in applications where alternate modules can be interchanged.