S71PL254 datasheet(116/196 Pages) SPANSION

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pSRAM Type 4

pSRAM_Type04_18A0 August 30, 2004

Advance

I n f o rmation

pSRAM Type 4

4 Mbit (256K x 16)

Features

Wide voltage range: 2.7V to 3.3V

Typical active current: 3 mA @ f = 1 MHz

Low standby power

Automatic power-down when deselected

Functional Description

The Type 4 pSRAM is a high-performance CMOS pseudo static RAM (pSRAM) or-

ganized as 256K words by 16 bits that supports an asynchronous memory

interface. This device features advanced circuit design to provide ultra-low active

current. The device can be put into standby mode reducing power consumption

dramatically when deselected (CE1# Low, CE2 High or both BHE# and BLE# are

High). The input/output pins (I/O0 through I/O15) are placed in a high-imped-

ance state when: deselected (CE1# High, CE2 Low, OE# is deasserted 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 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 Table 37 for a

complete description of read and write modes.

Product Portfolio

Notes:

1. Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at VCC = VCC

(typ) and TA = 25°C.

VCC Range (V)

Speed

(ns)

Power Dissipation

Operating, ICC (mA)

Standby (ISB2) (µA)

f = 1 MHz

f = fmax

Min

Typ

Max

Typ. (note 1)

Max

Typ. (note 1)

Max

Typ. (note 1)

Max

2.7V

3.0V

3.3V

70 ns

TBD

25 mA

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