CY7C1021D
1-Mbit (64K x 16) Static RAM
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
, CA 95134-1709
•
408-943-2600
Document #: 38-05462 Rev. *E
Revised February 22, 2007
Features
• Pin-and function-compatible with CY7C1021B
• High speed
—tAA = 10 ns
• Low active power
—ICC = 80 mA @ 10 ns
• Low CMOS Standby Power
—ISB2 = 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
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.
Logic Block Diagram
64K x 16
RAM Array
IO0–IO7
A7
A6
A5
A4
A3
A0
COLUMN DECODER
DATA IN DRIVERS
OE
A2
A1
IO8–IO15
CE
WE
BLE
BHE
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.
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