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M48Z512AYSH Datasheet(PDF) 3 Page - STMicroelectronics |
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M48Z512AYSH Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 17 page 3/17 M48Z512A, M48Z512AY The M48Z512A/512AY also has its own Power-fail Detect circuit. The control circuitry constantly mon- itors the single 5V 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 3V, the control circuitry con- nects the battery which maintains data until valid power returns. The ZEROPOWER RAM replaces industry stan- dard SRAMs. It provides the nonvolatility of PROMs without any requirement for special write Figure 3. Block Diagram AI02045 INTERNAL BATTERY E VCC VSS VOLTAGE SENSE AND SWITCHING CIRCUITRY 512K x 8 SRAM ARRAY A0-A18 DQ0-DQ7 W G POWER E timing or limitations on the number of writes that can be performed. The M48Z512A/512AY has its own Power-fail De- tect Circuit. The control circuitry constantly moni- tors the single 5V 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 operations brought on by low VCC.As VCC falls below approximately 3V, the control circuitry connects the battery which sustains data until valid power returns. |
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