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DS1603
8 of 9
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±10%; 0°C to +70°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Data to CLK Setup
tDC
50
ns
6
CLK to Data Hold
tCDH
60
ns
6
CLK to Data Delay
tCDD
200
ns
6, 7, 8
CLK Low Time
tCL
250
ns
6
CLK High Time
tCH
250
ns
6
CLK Frequency
fCLK
DC
2.0
MHz
6
CLK Rise and Fall
tF, tR
500
ns
RST
to CLK Setup
tCC
100
ns
6
CLK to RST Hold
tCCH
60
ns
6
RST
Inactive Time
tCWH
1
s
6
RST
Low to I/O High-Z
tRDZ
70
ns
6
CLK High to I/O High- Z
tCDZ
20
ns
6
(TA = +25°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Expected Data
Retention Time
tDR
10
years
10
NOTES:
1) All voltages are referenced to ground.
2) Logic 1 voltages are specified at a source current of 1mA.
3) Logic 0 voltages are specified at a sink current of 4mA.
4) ICC is specified with the DQ pin open.
5) ICC1 is specified with VCC at 5.0V and RST = GND.
6) Measured at VIH = 2.0V or VIL = 0.8V.
7) Measured at VOH = 2.4V or VOL - 0.4V.
8) Load capacitance = 50pF.
9) Battery trip point is the point at which the VCC powered counter and the serial port stops operation.
The battery trip point drops below the minimum once the internal lithium energy cell is exhausted.
10) The expected tDR is defined as accumulative time in the absence of VCC with the clock oscillator
running.
11) Real-time clock modules can be successfully processed through conventional wave-soldering
techniques as long as temperature exposure to the lithium energy source contained within does not
exceed +85
°C. Post-solder cleaning with water-washing techniques is acceptable, provided that
ultrasonic vibration is not used.
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