CY62146ELL-45ZSXI SRAM, 4 Mb (256 K x 16), 5 V, 45ns, TSOP-44

4-Mbit (256 K × 16) Static RAM, SRAM, 5V 256kx16 45ns TSOP32(II)

Description The CY62146E is a high performance CMOS static RAM organized as 256K words by 16 bits. This device features advanced circuit design to provide ultra low active current. It is ideal for providing More Battery Life? (MoBL®) in portable applications. The device also has an automatic power down feature that reduces power consumption when addresses are not toggling. Placing the device into standby mode reduces power consumption by more than 99% when deselected (CE HIGH). The input and output pins (I/O0 through I/O15) are placed in a high impedance state when the device is deselected (CE HIGH), the outputs are disabled (OE HIGH), both Byte High Enable and Byte Low Enable are disabled (BHE, BLE 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. 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 A17). 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 A17). To read from the device, take 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 I/O0 to I/O7. If Byte High Enable (BHE) is LOW, then data from memory appears on I/O8 to I/O15. See Truth Table on page 11 for a complete description of read and write modes. The CY62146E device is suitable for interfacing with processors that have TTL I/P levels. It is not suitable for processors that require CMOS I/P levels.

Features - Very high speed: 45 ns - Wide voltage range: 4.5 V to 5.5 V - 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 - Complementary metal oxide semiconductor (CMOS) for optimum speed and power - Available in Pb-free 44-pin thin small outline package (TSOP) Type II package