CY7C1021D Datasheet, PDF (1/11 Pages) Cypress Semiconductor – 1-Mbit (64K x 16) Static RAM

CY7C1021D
1-Mbit (64K x 16) Static RAM
Features
• Pin-and function-compatible with CY7C1021B
• High speed
— t_AA = 10 ns
• Low active power
— I_CC = 80 mA @ 10 ns
• Low CMOS Standby Power
— I_SB2 = 3 mA
• 2.0V Data Retention
• Automatic power-down when deselected
• CMOS for optimum speed/power
• Independent control of upper and lower bits
• Available in Pb-free 44-pin 400-Mil wide Molded SOJ and
44-pin TSOP II packages
Logic Block Diagram
Functional Description ^[1]
The CY7C1021D is a high-performance CMOS static RAM
organized as 65,536 words by 16 bits. This device has an
automatic power-down feature that significantly reduces
power consumption when deselected. The input/output pins
(IO₀ through IO₁₅) are placed in a high-impedance state when:
• Deselected (CE HIGH)
• Outputs are disabled (OE HIGH)
• BHE and BLE are disabled (BHE, BLE HIGH)
• When the write operation is active (CE LOW, and WE LOW)
Write to the device by taking Chip Enable (CE) and Write
Enable (WE) inputs LOW. If Byte Low Enable (BLE) is LOW,
then data from IO pins (IO₀ through IO₇), is written into the
location specified on the address pins (A₀ through A₁₅). If Byte
High Enable (BHE) is LOW, then data from IO pins (IO₈
through IO₁₅) is written into the location specified on the
address pins (A₀ through A₁₅).
Read from the device by taking Chip Enable (CE) and Output
Enable (OE) LOW while forcing the Write Enable (WE) HIGH.
If Byte Low Enable (BLE) is LOW, then data from the memory
location specified by the address pins appears on IO₀ to IO₇.
If Byte High Enable (BHE) is LOW, then data from memory
appears on IO₈ to IO₁₅. See the “Truth Table” on page 8 for a
complete description of read and write modes.
DATA IN DRIVERS
A₇
A₆
A₅
A₄
64K x 16
A₃
RAM Array
A₂
A₁
A₀
IO₀–IO₇
IO₈–IO₁₅
COLUMN DECODER
BHE
WE
CE
OE
BLE
Note
1. For guidelines on SRAM system design, please refer to the ‘System Design Guidelines’ Cypress application note, available on the internet at www.cypress.com.
Cypress Semiconductor Corporation
Document #: 38-05462 Rev. *E
• 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Revised February 22, 2007
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