ICM7216A Datasheet, PDF (6/17 Pages) Intersil Corporation – 8-Digit, Multi-Function, Frequency Counters/Timers

ICM7216A, ICM7216B, ICM7216D
Timing Diagram
INTERNAL
STORE
30ms TO 40ms
INTERNAL
RESET
MEASUREMENT
IN PROGRESS
(INTERNAL ON
7216A/B)
40ms
60ms
40ms
UPDATE
190ms TO 200ms
FUNCTION:
TIME INTERVAL
PRIMING
MEASUREMENT INTERVAL
UPDATE
INPUT A
PRIMING EDGES
INPUT B
NOTE:
1. If range is set to 1 event, first and last measured interval will coincide.
250ns MIN
MEASURED
INTERVAL
(FIRST)
MEASURED
INTERVAL
(LAST)
FIGURE 1. WAVEFORMS FOR TIME INTERVAL MEASUREMENT (OTHERS ARE SIMILAR, BUT WITHOUT PRIMING PHASE)
Typical Performance Curves
20
f_A (MAX) FREQUENCY UNIT COUNTER,
FREQUENCY RATIO MODES
15
10
f_A (MAX) f_B (MAX) PERIOD,
TIME INTERVAL MODES
5
T_A = 25^oC
0
3
4
5
6
V_DD-V_SS (V)
FIGURE 2. f_A(MAX), f_B(MAX) AS A FUNCTION OF SUPPLY
300
4.5 ≤ V_DD ≤ 6.0V
200
100
85^oC
25^oC
-20^oC
0
0
1
2
3
V_DD-V_OUT (V)
FIGURE 3. ICM7216A TYPICAL I_DIG vs V_DD-V_OUT
9-15