CY62128E MoBL
®
1-Mbit (128K x 8) Static RAM
Features
• Very high speed: 45 ns
• Temperature ranges
— Industrial: –40°C to +85°C
— Automotive-A: –40°C to +85°C
— Automotive-E: –40°C to +125°C
• Voltage range: 4.5V–5.5V
• Pin compatible with CY62128B
• Ultra low standby power
— Typical standby current: 1
µA
— Maximum standby current: 4
µA
(Industrial)
• Ultra low active power
•
•
•
•
— Typical active current: 1.3 mA @ f = 1 MHz
Easy memory expansion with CE
1
, CE
2
and OE features
Automatic power down when deselected
CMOS for optimum speed and power
Offered in standard Pb-free 32-pin STSOP, 32-pin SOIC,
and 32-pin TSOP I packages
Functional Description
The CY62128E is a high performance CMOS static RAM
organized as 128K words by 8 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 when addresses are not toggling.
Placing the device into standby mode reduces power
consumption by more than 99% when deselected (CE
1
HIGH
or CE
2
LOW). The eight input and output pins (IO
0
through
IO
7
) are placed in a high impedance state when the device is
deselected (CE
1
HIGH or CE
2
LOW), the outputs are disabled
(OE HIGH), or a write operation is in progress (CE
1
LOW and
CE
2
HIGH and WE LOW)
To write to the device, take Chip Enable (CE
1
LOW and CE
2
HIGH) and Write Enable (WE) inputs LOW. Data on the eight
IO pins (IO
0
through IO
7
) is then written into the location
specified on the address pins (A
0
through A
16
).
To read from the device, take Chip Enable (CE
1
LOW and CE
2
HIGH) and Output Enable (OE) LOW while forcing Write
Enable (WE) HIGH. Under these conditions, the contents of
the memory location specified by the address pins appears on
the IO pins.
Logic Block Diagram
CE1
CE2
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
WE
OE
INPUT BUFFER
IO0
IO1
SENSE AMPS
IO2
IO3
IO4
IO5
IO6
ROW DECODER
128K x 8
ARRAY
COLUMN DECODER
POWER
DOWN
IO7
A12
A14
A15
Note
1. For best practice recommendations, refer to the Cypress application note
“System Design Guidelines”
at
A13
A16
Cypress Semiconductor Corporation
Document #: 38-05485 Rev. *E
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised May 07, 2007
CYPRESS [ CYPRESS SEMICONDUCTOR ]
