EDI8F32259C Datasheet | White Electronic Designs Corporation

FEATURES - 256Kx32 bit CMOS Static RAM - - - - - Access Times: 15, 20, and 25ns Individual Byte Selects Fully Static, No Clocks TTL patible I/O 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 bination 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 patible 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. High Density Package with JEDEC Standard Pinouts - - 72 Pin ZIP No. 176 72 Pin SIMM, No. 354 (Straight) - 72 Pin SIMM No. 175 (Angle) .. - Single +5V (±10%) Supply Operation FIG. 1 PIN CONFIGURATIONS AND BLOCK DIAGRAM NC NC PD3 PD4 VSS PD1 PD2 DQ0 DQ8 DQ1 DQ9 DQ2 DQ10 DQ3 DQ11 VCC A0 A7 A1 A8 A2 A9 DQ12 DQ4 DQ13 DQ5 DQ14 DQ6 DQ15 DQ7 VSS W# A15 A14 E2# E1# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 E4# E3# A17 A16 G# VSS DQ24 DQ16 DQ25 DQ17 DQ26 DQ18 DQ27 DQ19 A3 A10 A4 A11 A5 A12 VCC A13 A6 DQ20 DQ28 DQ21 DQ29 DQ22 DQ30 DQ23 DQ31 VSS NC NC NC NC 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 PIN NAMES AØ-A17 EØ#-E3# W# G# DQØ-DQ31 VCC VSS A0 - A17 W# G# 256K X4 E0# 256K X4 E1# 256K X4 E2# 256K X4 E3# DQ24 - DQ27 256K X4 DQ28 - DQ31 DQ16 - DQ19 256K X4 DQ20 - DQ23 DQ8 - DQ11...