M48Z32V datasheet(4/16 Pages) STMICROELECTRONICS

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M48Z32V

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Figure 4. Block Diagram

OPERATING MODES

The M48Z32V also has its own Power-fail Detect

circuit. The control circuitry constantly monitors

the single power supply for an out of tolerance

condition. When VCC is out of tolerance, the circuit

write protects the SRAM, providing a high degree

of data security in the midst of unpredictable sys-

tem operation brought on by low VCC. As VCC falls

below approximately VSO, 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.

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

AI04788

LITHIUM

CELL

VPFD

VCC

VSS

VOLTAGE SENSE

AND

SWITCHING

CIRCUITRY

32K x 8

SRAM ARRAY

A0-A14

DQ0-DQ7

POWER

USER

SUPPLIED

Mode

VCC

DQ0-DQ7

Power

Deselect

3.0 to 3.6V

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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