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DS1302SN Datasheet(PDF) 11 Page - Dallas Semiconductor |
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DS1302SN Datasheet(HTML) 11 Page - Dallas Semiconductor |
11 / 16 page DS1302 Trickle-Charge Timekeeping Chip 11 of 16 CAPACITANCE (TA = +25°C) PARAMETER SYMBOL MIN TYP MAX UNITS Input Capacitance CI 10 pF I/O Capacitance CI/O 15 pF AC ELECTRICAL CHARACTERISTICS (TA = 0°C to +70°C or TA = -40°C to +85°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VCC = 2.0V 200 Data to CLK Setup tDC VCC = 5V (Note 6) 50 ns VCC = 2.0V 280 CLK to Data Hold tCDH VCC = 5V (Note 6) 70 ns VCC = 2.0V 800 CLK to Data Delay tCDD VCC = 5V (Notes 6, 7, 8) 200 ns VCC = 2.0V 1000 CLK Low Time tCL VCC = 5V (Note 6) 250 ns VCC = 2.0V 1000 CLK High Time tCH VCC = 5V (Note 6) 250 ns VCC = 2.0V 0.5 CLK Frequency tCLK VCC = 5V (Note 6) DC 2.0 MHz VCC = 2.0V 2000 CLK Rise and Fall tR, tF VCC = 5V 500 ns VCC = 2.0V 4 CE to CLK Setup tCC VCC = 5V (Note 6) 1 µs VCC = 2.0V 240 CLK to CE Hold tCCH VCC = 5V (Note 6) 60 ns VCC = 2.0V 4 CE Inactive Time tCWH VCC = 5V (Note 6) 1 µs VCC = 2.0V 280 CE to I/O High Impedance tCDZ VCC = 5V (Note 6) 70 ns VCC = 2.0V 280 SCLK to I/O High Impedance tCCZ VCC = 5V (Note 6) 70 ns Note 1: Limits at -40°C are guaranteed by design and are not production tested. Note 2: All voltages are referenced to ground. Note 3: ICC1T and ICC2T are specified with I/O open, CE and SCLK set to a logic 0. Note 4: ICC1A and ICC2A are specified with the I/O pin open, CE high, SCLK = 2MHz at VCC = 5V; SCLK = 500kHz, VCC = 2.0V. Note 5: CE, SCLK, and I/O all have 40k Ω pulldown resistors to ground. Note 6: Measured at VIH = 2.0V or VIL = 0.8V and 10ns maximum rise and fall time. Note 7: Measured at VOH = 2.4V or VOL = 0.4V. Note 8: Load capacitance = 50pF. Note 9: ICC1S and ICC2S are specified with CE, I/O, and SCLK open. Note 10: VCC = VCC2, when VCC2 > VCC1 + 0.2V; VCC = VCC1, when VCC1 > VCC2. Note 11: VCC2 = 0V. Note 12: VCC1 = 0V. Note 13: Typical values are at +25°C. |
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