DS1202, DS1202SSerial Timekeeping ChipDS1202, DS1202SCopyright 1997 by Dallas Semiconductor Corporation.All Rights Reserved. For important informati

DS1202, DS1202S032697 10/11DS1202S SERIAL TIMEKEEPER 16–PIN SOICDIM MIN MAX16–PINPKGA IN. 0.500 0.511MM 12.70 12.99B IN. 0.290 0.300MM 7.37 7.65C I

DS1202, DS1202S032697 11/11DS1202S8 8–PIN SOIC 200 MIL1BJK GCE0–8 deg. typ.DIM MIN MAX8–PINPKGA IN. 0.203 0.213MM 5.16 5.41B IN. 0.203 0.213MM 5.1

DS1202, DS1202S032697 2/11OPERATIONThe main elements of the Serial Timekeeper are shownin Figure 1: shift register, control logic, oscillator, realtim

DS1202, DS1202S032697 3/11RESET AND CLOCK CONTROLAll data transfers are initiated by driving the RST inputhigh. The RST input serves two functions. Fi

DS1202, DS1202S032697 4/11REGISTER SUMMARYA register data format summary is shown in Figure 4.CRYSTAL SELECTIONA 32.768 KHz crystal, can be directly c

DS1202, DS1202S032697 5/11REGISTER ADDRESS/DEFINITION Figure 41760504030201RD0WREGISTER ADDRESS REGISTER DEFINITION01 0 0 0 0 1RD0W1 0 0 0 1 0RD01 0 0

DS1202, DS1202S032697 6/11ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground –0.3V to +7.0VOperating Temperature 0°C to 70°CStorage Temper

DS1202, DS1202S032697 7/11AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 2.0 to 5.5V*)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESData to CLK SetuptDC

DS1202, DS1202S032697 8/11TIMING DIAGRAM: READ DATA TRANSFER Figure 5tCCtCDZtCDDtCDHtDC017RESETCLOCKDATA INPUT/OUTPUTCOMMAND BYTETIMING DIAGRAM: WRI

DS1202, DS1202S032697 9/1110.ICC2 is specified with RST, I/O, and SCLK open. The clock halt flag must be set to logic one (oscillator disabled).11. A