CYM1464

64 CYM1464 512Kx8 Static RAM Module Features High-density 4-megabit SRAM module High-speed CMOS SRAMs — Access time of 20 ns Low active power — 1.93W (max.) JEDEC-compatible pinout 32-pin, 0.6-inch-wide DIP package TTL-compatible inputs and outputs Low profile — Max. height of 0.34 inches constructed using four 256K x 4 static RAMs in SOJ packages mounted on an epoxy laminate substrate with pins. Writing to the module is accomplished when the chip select (CS) and write enable (WE) inputs are both LOW. Data on the eight input/output pins (I/O0 through I/O7) of the device is written into the memory location specified on the address pins (A0 through A18). Reading the device is accomplished by taking chip select and output enable (OE) LOW, while write enable (WE) remains inactive or HIGH. Under these conditions, the contents of the memory location specified on the address pins (A0 through A18) will appear on the eight appropriate data input/output pins (I/O0 through I/O7). The input/output pins remain in a high-impedance state unless the module is selected, outputs are enabled, and write enable (WE) is HIGH. Functional Description The CYM1464 is a high-performance 4-megabit static RAM module organized as 512K words by 8 bits. This module is Logic Block Diagram A0 − A17 WE OE 256K x 4 SRAM 256K x 4 SRAM Pin Configuration DIP Top View A18 A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 I/O0 I/O1 I/O2 GND I/O0 − I/O 7 1S 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 ...