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CY7C128A-25VC
28A CY7C128A 2K x 8 Static RAM Features • Automatic power-down when deselected • CMOS for optimum speed/power • High speed — 15 ns • Low active power — 660 mW (commercial) — 688 mW (military—20 ns) • Low standby power — 110 mW (20 ns) • TTL-compatible inputs and outputs • Capable of withstanding greater than 2001V electrostatic discharge • VIH of 2.2V Functional Description provided by an active LOW Chip Enable (CE), and active LOW Output Enable (OE) and three-state drivers. The CY7C128A has an automatic power-down feature, reducing the power consumption by 83% when deselected. Writing to the device is accomplished when the Chip Enable (CE) and Write Enable (WE) inputs are both LOW. Data on the eight I/O pins (I/O0 through I/O7) is written into the memory location specified on the address pins (A0 through A10). Reading the device is accomplished by taking Chip Enable (CE) and Output Enable (OE) LOW while Write Enable (WE) remains HIGH. Under these conditions, the contents of the memory location specified on the address pins will appear on the eight I/O pins. The I/O pins remain in high-impedance state when Chip Enable (CE) or Output Enable (OE) is HIGH or Write Enable (WE) is LOW. The CY7C128A utilizes a die coat to insure alpha immunity. The CY7C128A is a high-performance CMOS static RAM organized as 2048 words by 8 bits. Easy memory expansion is Pin Configurations Logic Block Diagram DIP/SOJ/SOIC Top View I/O0 INPUT BUFFER I/O3 I/O4 A4 A3 A2 A1 A0 I/O0 I/O1 I/O5 CE WE I/O6 POWER DOWN COLUMN DECODER I/O7 OE A3 A2 A1 A0 VCC A8 A9 WE OE A10 CE I/O7 I/O6 I/O5 I/O4 I/O3 C128A–2 A5 A6 A7 VCC A8 128 x 16 x 8 ARRAY LCC Top View 3 2 1 24 23 4 22 5 21 6 20 7 7C128A 19 8 18 9 17 10 16 11 12 13 14 15 I/O 2 GND I/O 3 I/O 4 I/O 5 A6 A5 A4 1 24 23 2 22 3 4 21 5 20 6 19 7C128A 18 7 17 8 9 16 10 15 11 14 12 13 I/O2 SENSE AMPS A8 A7 I/O1 ROW DECODER A10 A9 A7 A6 A5 A4 A3 A2 A1 A0 I/O0 I/O1 I/O2 GND C128A–1 A9 WE OE A10 CE I/O7 I/O6 C128A–3 Selection Guide 7C128A-15 15 120 40 - Maximum Access Time (ns) Maximum Operating Commercial Current (mA) Military Maximum Standby Commercial Current (mA) Military Cypress Semiconductor Corporation Document #: 38-05028 Rev. ** • 7C128A-20 20 120 125 20 20 3901 North First Street • 7C128A-25 25 120 125 20 20 San Jose • 7C128A-35 35 120 125 20 20 7C128A-45 45 120 125 20 20 CA 95134 • 408-943-2600 Revised August 24, 2001 [+] Feedback
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