Cypress CY62148ESL manual Features, Functional Description, Logic Block Diagram

Features

■Very high speed: 55 ns

■Wide voltage range: 2.2V to 3.6V and 4.5V to 5.5V

■Ultra low standby power

❐Typical standby current: 1 μA

❐Maximum standby current: 7 μA

■Ultra low active power

❐Typical active current: 2 mA at f = 1 MHz

■Easy memory expansion with CE and OE features

■Automatic power down when deselected

■CMOS for optimum speed and power

■Available in Pb-free 32-pin STSOP package

CY62148ESL MoBL®

4-Mbit (512K x 8) Static RAM

Functional Description

The CY62148ESL is a high performance CMOS static RAM organized as 512K 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. Placing the device into standby mode reduces power consumption by more than 99 percent when deselected (CE HIGH). The eight input and output pins (IO0 through IO7) are placed in a high impedance state when the device is deselected (CE HIGH), the outputs are disabled (OE HIGH), or during a write operation (CE LOW and WE LOW).

To write to the device, take Chip Enable (CE) and Write Enable (WE) inputs LOW. Data on the eight IO pins (IO0 through IO7) is then written into the location specified on the address pins (A0 through A18).

To read from the device, take Chip Enable (CE) 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 appear on the IO pins.

For best practice recommendations, refer to the Cypress application note AN1064, SRAM System Guidelines.

Logic Block Diagram
A0		INPUT BUFFER						IO0
A1
A2								IO1
A3	DECODER		512K x 8				AMPS
A6								IO3
A4								IO2
A5
A7	ROW						SENSE
A8			ARRAY					IO4
A9
A10								IO5
A11
A12								IO6
CE	COLUMN DECODER						POWER	IO7
WE
							DOWN
OE	13	14	15	16	17	18
	A	A	A	A	A	A

Cypress Semiconductor Corporation • 198 Champion Court	•	San Jose, CA 95134-1709	•	408-943-2600
Document #: 001-50045 Rev. **		Revised January 21, 2009

[+] Feedback