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1338-31DVGI Datasheet(PDF) 5 Page - Integrated Device Technology |
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1338-31DVGI Datasheet(HTML) 5 Page - Integrated Device Technology |
5 / 23 page IDT1338 REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM RTC IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 5 IDT1338 REV K 032910 Power Control A precise, temperature-compensated voltage reference and a comparator circuit provides power-control function that monitors the VCC level. The device is fully accessible and data can be written and read when VCC is greater than VPF. However, when VCC falls below VPF, the internal clock registers are blocked from any access. If VPF is less than VBAT, the device power is switched from VCC to VBAT when VCC drops below VPF. If VPF is greater than VBAT, the device power is switched from VCC to VBAT when VCC drops below VBAT. The registers are maintained from the VBAT source until VCC is returned to nominal levels (Table 1). After VCC returns above VPF, read and write access is allowed after tREC (see the “Power-Up/Down Timing” diagram). Table 1. Power Control Power-up/down Timing Table 2. Power-up/down Characteristics Ambient Temperature -40 to +85° C Note : This delay applies only if the oscillator is running. If the oscillator is disabled or stopped, no power-up delay occurs. Supply Condition Read/Write Access Powered By VCC < VPF, VCC < VBAT No VBAT VCC < VPF, VCC > VBAT No VCC VCC > VPF, VCC < VBAT Yes VCC VCC > VPF, VCC > VBAT Yes VCC Parameter Symbol Conditions Min. Typ. Max. Units Recovery at Power-up tREC (see note below) 2 ms VCC Fall Time; VPF(MAX) to VPF(MIN) tVCCF 300 µs VCC Rise Time; VPF(MIN) to VPF(MAX) tVCCR 0 µs |
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