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DS1215032697 10/15TIMING DIAGRAM: READ CYCLE TO TIME CHIP ROM/RAM = GNDCEIOEQWE = VIHOUTPUT DATA VALID tRC tOD tRR tCO tOE tCOE tODOtOEETIMING DIAGRA

DS1215032697 11/15TIMING DIAGRAM: READ CYCLE ROM/RAM = VCCOOUTPUT DATA VALID tRC tCO tRR tOD tRR tRC tOE tAS tAS tOEE tCOE tODO tAH tAHCEIOEWEQTIMING

DS1215032697 12/15TIMING DIAGRAM: POWER DOWN tCE tPD tCEtPFVBAT - 0.2VVIHVILVILVIH4.5V3VtFCEICEOCEOVCCIROM/RAM = GNDROM/RAM = VCCOTIMING DIAGRAM: PO

DS1215032697 13/15NOTES:1. All voltages are referenced to ground.2. Measured with load shown in Figure 6.3. Input pulse rise and fall times equal 10 n

DS1215032697 14/15DS1215 TIME CHIP1CAB DHJKGEFDIM MIN MAX16–PINPKGA IN. 0.740 0.780MMB IN. 0.240 0.260MMC IN. 0.120 0.140MMD IN. 0.300 0.325MME I

DS1215032697 15/15DS1215S SERIAL TIMEKEEPER 16–PIN SOICAFCEphiJGKLHB1PKG16–PINDIM MIN MAXA IN.MM0.40210.210.41210.46B IN.MM0.2907.370.3007.65C IN.MM0.

DS1215032697 2/15OPERATIONThe block diagram of Figure 1 illustrates the main ele-ments of the Time Chip. Communication with the TimeChip is establish

DS1215032697 3/15When the first write cycle is executed, it is compared tobit 1 of the 64–bit comparison register. If a match isfound, the pointer in

DS1215032697 4/15NONVOLATILE CONTROLLER OPERATIONThe operation of the nonvolatile controller circuits withinthe Time Chip is determined by the level o

DS1215032697 5/15RAM/TIME CHIP INTERFACE Figure 3CMOS STATIC RAMADDDATA I/OWEOECEDS1215CEOOEWECEIRSTBAT1X1BAT2X2VCCODQVCCIROM/RAM++BAT1BAT232.768 KHz4

DS1215032697 6/15TIME CHIP REGISTER DEFINITION Figure 57654 32100.1 SEC00–9900–5900–5901–1201–0701–3101–1200–9901234567RANGE(BCD)REGISTER0012/24 010HR

DS1215032697 7/15ABSOLUTE MAXIMUM RATINGS*Voltage on any Pin Relative to Ground –0.3V to +7.0V Operating Temperature 0°C to 70°C Storage Temperature –

DS1215032697 8/15AC ELECTRICAL CHARACTERISTICS ROM/RAM = GND (0°C to 70°C; VCC = 4.5 to 5.5V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESRead Cycle Time

DS1215032697 9/15AC ELECTRICAL CHARACTERISTICS ROM/RAM = VCCO (0°C to 70°C; VCC = 5V ± 10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESRead Cycle Time tR