8-Mbit (512K x 16) MoBL® Static RAM
CY62157DV30 MoBL®
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
, CA 95134-1709
•
408-943-2600
Document #: 38-05392 Rev. *H
Revised August 8, 2006
Features
• Temperature Ranges
— Industrial: –40°C to 85°C
— Automotive-A: –40°C to 85°C
— Automotive-E: –40°C to 125°C
• Very high speed: 45 ns
• Wide voltage range: 2.20V–3.60V
• Pin-compatible with CY62157CV25, CY62157CV30, and
CY62157CV33
• Ultra-low active power
— Typical active current: 1.5 mA @ f = 1 MHz
— Typical active current: 12 mA @ f = fmax
• Ultra-low standby power
• Easy memory expansion with CE1, CE2, and OE
features
• Automatic power-down when deselected
• CMOS for optimum speed/power
• Available in Pb-free and non Pb-free 48-ball FBGA,
44-pin TSOPII, and Pb-free 48-pin TSOPI
Functional Description[1]
The CY62157DV30 is a high-performance CMOS static RAM
organized as 512K words by 16 bits. This device features
advanced circuit design to provide ultra-low active current.
This is ideal for providing More Battery Life
™ (MoBL®) in
portable applications such as cellular telephones.The device
also has an automatic power-down feature that significantly
reduces power consumption. The device can also be put into
standby mode when deselected (CE1 HIGH or CE2 LOW or
both BHE and BLE are HIGH). The input/output pins (I/O0
through I/O15) are placed in a high-impedance state when:
deselected (CE1HIGH or CE2 LOW), outputs are disabled (OE
HIGH), both Byte High Enable and Byte Low Enable are
disabled (BHE, BLE HIGH), or during a write operation (CE1
LOW, CE2 HIGH and WE LOW).
Writing to the device is accomplished by taking Chip Enables
(CE1 LOW and CE2 HIGH) and Write Enable (WE) input LOW.
If Byte Low Enable (BLE) is LOW, then data from I/O pins (I/O0
through I/O7), is written into the location specified on the
address pins (A0 through A18). If Byte High Enable (BHE) is
LOW, then data from I/O pins (I/O8 through I/O15) is written into
the location specified on the address pins (A0 through A18).
Reading from the device is accomplished by taking Chip
Enables (CE1 LOW and CE2 HIGH) 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 will appear on I/O0 to I/O7. If Byte
High Enable (BHE) is LOW, then data from memory will appear
on I/O8 to I/O15. See the truth table for a complete description
of read and write modes.
Note:
1. For best practice recommendations, please refer to the Cypress application note entitled System Design Guidelines, which is available at http://www.cypress.com.
Logic Block Diagram
512K × 16
RAM Array
I/O0–I/O7
A8
A7
A6
A5
A2
COLUMN DECODER
DATA-IN DRIVERS
OE
A4
A3
I/O8–I/O15
WE
BLE
BHE
A0
A1
A9
A10
Power-down
Circuit
CE2
CE1
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