M48Z08 datasheet(4/16 Pages) STMICROELECTRONICS

Il numero della parte	M48Z08

Spiegazioni elettronici	5V, 64 Kbit (8Kb x 8) ZEROPOWER® SRAM

PDF	16 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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4 / 16 page

M48Z08, M48Z18

4/16

Figure 4. Block Diagram

OPERATION MODES

The M48Z08/18 also has its own Power-fail Detect

circuit. The control circuitry constantly monitors

the single 5V supply for an out of tolerance condi-

tion. When VCC is out of tolerance, the circuit write

protects the SRAM, providing a high degree of

data security in the midst of unpredictable system

operation brought on by low VCC. As VCC falls be-

low approximately 3V, the control circuitry con-

nects the battery which maintains data until valid

power returns.

Table 2. Operating Modes

Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.

1. See Table 10., page 12 for details.

AI01394

LITHIUM

CELL

VPFD

VCC

VSS

VOLTAGE SENSE

AND

SWITCHING

CIRCUITRY

8K x 8

SRAM ARRAY

A0-A12

DQ0-DQ7

POWER

Mode

VCC

DQ0-DQ7

Power

Deselect

4.75 to 5.5V

4.5 to 5.5V

VIH

High Z

Standby

WRITE

VIL

DIN

Active

READ

VIL

VIH

DOUT

Active

READ

VIL

VIH

High Z

Active

Deselect

VSO to VPFD(min)

(1)

High Z

CMOS Standby

Deselect

≤ VSO(1)

High Z

Battery Back-up Mode

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