Productos
The M48Z35-70PC1 from ST is a 256Kbit Timekeeper NVRAM combining 32Kx8 SRAM with an integrated real-time clock and embedded lithium battery. Battery maintains both SRAM contents and RTC during power loss for 10+ years. 70ns access. DIP-28 socketable package. For time-stamping and nonvolatile data storage.
Especificaciones
| Tipo | Timekeeper NVRAM (SRAM + RTC + Lithium) |
| SRAM Density | 256 Kbit (32K x 8) |
| RTC | Yes (integrated) |
| Battery | Integrated lithium (10+ year life) |
| Access Time | 70 ns |
| Interface | Parallel (SRAM-compatible) |
| Clock Accuracy | +/-1 min/month at 25C |
| Tensión de alimentación | 5V |
| Temperatura de funcionamiento | 0 to +70C |
| Paquete | DIP-28 (600mil) |
Principio de funcionamiento
The M48Z35 integrates a 32Kx8 SRAM array, a real-time clock (RTC), and a lithium energy cell in a single package. During normal operation (VCC present), the SRAM and RTC operate from the external supply. When VCC drops below the switch-over threshold (4.5V), the internal lithium cell automatically powers the SRAM and RTC, maintaining data and timekeeping. The RTC provides seconds, minutes, hours, day, date, month, and year with automatic leap year correction. The SRAM is accessed at standard address locations; the RTC registers are accessed at the top 8 locations via the address bus.
Aplicaciones
- Time-stamping
- Data logging
- Billing systems
- Nonvolatile storage
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