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M48Z32V Datasheet(PDF) 4 Page - STMicroelectronics |
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M48Z32V Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 16 page M48Z32V 4/16 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 E W G POWER USER SUPPLIED Mode VCC E G W DQ0-DQ7 Power Deselect 3.0 to 3.6V VIH X X High Z Standby WRITE VIL X VIL DIN Active READ VIL VIL VIH DOUT Active READ VIL VIH VIH High Z Active Deselect VSO to VPFD (min) (1) X X X High Z CMOS Standby Deselect ≤ VSO(1) X X X High Z Battery Back-up Mode |
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