DS1318 Datasheet, PDF (6/15 Pages) Dallas Semiconductor – Parallel-Interface Elapsed Time Counter

Parallel-Interface Elapsed Time Counter
AC TEST CONDITIONS
PARAMETER
Input Pulse Levels
Output Load Including Scope and Jig
Input and Output Timing Measurement Reference Levels
Input-Pulse Rise and Fall Times
TEST CONDITION
0 to 2.7V
25pF + 1TTL Gate
V_CC / 2
4ns
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.
(V_CC = +3.3V, T_A = +25°C, unless otherwise noted.)
Typical Operating Characteristics
I_BAT vs. TEMPERATURE
V_BAT = 3.0V
850
V_CC = 0
800
750
700
650
600
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
I_BAT vs. V_BAT
850
V_CC = 0
800
750
700
650
600
550
500
1.5 1.9 2.3 2.7 3.1 3.5
V_BACKUP (V)
OSCILLATOR FREQUENCY vs. VOLTAGE
32768.50
32768.45
32768.40
32768.35
32768.30
32768.25
32768.20
32768.15
32768.10
32768.05
32768.00
2.0
2.5
3.0
3.5
4.0
INPUT VOLTAGE (V)
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