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DS1248Y70IND Datasheet(PDF) 10 Page - Dallas Semiconductor |
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DS1248Y70IND Datasheet(HTML) 10 Page - Dallas Semiconductor |
10 / 21 page DS1248/DS1248P 10 of 21 PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS Over the operating range (5V) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Read Cycle Time tRC 65 ns CE Access Time tCO 55 ns OE Access Time tOE 55 ns CE to Output Low-Z tCOE 5ns OE to Output Low-Z tOEE 5ns CE to Output High-Z tOD 25 ns 5 OE to Output High-Z tODO 25 ns 5 Read Recovery tRR 10 ns Write Cycle Time tWC 65 ns Write Pulse Width tWP 55 ns 3 Write Recovery tWR 10 ns 10 Data Setup Time tDS 30 ns 4 Data Hold Time tDH 0ns 4 CE Pulse Width tCW 60 ns RESET Pulse Width tRST 65 ns POWER-DOWN/POWER-UP TIMING Over the operating range (3.3V) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES CE at VIH before Power-Down tPD 0 ms VCC Slew from VPF(max) to VPF(min)( CE at VPF) tF 300 ms VCC Slew from VPF(min) to VSO tFB 10 ms VCC Slew from VPF(max) to VPF(min)( CE at VPF) tR 0 ms CE at VIH after Power-Up tREC 1.5 2.5 ms (TA = +25°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Expected Data Retention Time tDR 10 years 9 Warning: Under no circumstances are negative undershoots of any amplitude allowed when device is in battery-backup mode. |
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