Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
DS1318
Parallel-Interface Elapsed Time Counter
6 _____________________________________________________________________
AC TEST CONDITIONS
WARNING:
Under no circumstances are negative undershoots, of any amplitude, allowed when device is in write protection.
Note 2: Limits at -40°C are guaranteed by design and not production tested.
Note 3: All voltages are referenced to ground.
Note 4: OE, CE, WE, EXT, and A3–A0.
Note 5: DQ7–DQ0, SQW, and IRQ, when the outputs are high impedance.
Note 6: Outputs open.
Note 7: Specified with parallel bus inactive.
Note 8: Measured with a 32,768kHz crystal attached to the X1 and X2 pins.
Note 9: The parameter t
OSF
is the period of time that the oscillator must be stopped for the OSF flag to be set over the voltage
range of 0V ≤ V
CC
≤ V
CC(MAX)
and 1.3V ≤ V
BAT
≤ 3.7V.
Note 10: This delay applies only if the oscillator is enabled and running. If the ENOSC bit is 0, t
REC
is disabled, and the device is
immediately accessible. If CE and OE are low on power-up, the DQ outputs are active. Valid data out is not available until
after t
REC
.