4-Mbit (256K x 16) Pseudo Static RAM
• Advanced low-power architecture
•High speed: 55 ns, 60 ns and 70 ns
•Wide voltage range: 2.7V to 3.6V
•Typical active current: 1 mA @ f = 1 MHz
•Low standby power
•Automatic power-down when deselected
The M24L416256DA is a high-performance CMOS pseudo
static RAM (PSRAM) organized as 256K words by 16 bits that
supports an asynchronous memory interface. This device
features advanced circuit design to provide ultra-low active
current. This is ideal for portable applications such as cellular
telephones. The device can be put into standby mode
reducing power consumption dramatically when deselected
( CE1 HIGH, 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 ( CE1 HIGH, CE2
LOW, OE is HIGH), or during a write operation (Chip
Enabled and Write Enable WE LOW).
Reading from the device is accomplished by asserting the
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 A0 through A17 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
Elite Semiconductor Memory Technology Inc.
Publication Date: Jul. 2008