ICM7216B_04 Datasheet, PDF (6/18 Pages) Intersil Corporation – 8-Digit, Multi-Function, Frequency Counters/Timers

ICM7216B, ICM7216D
Timing Diagram
INTERNAL
STORE
30ms TO 40ms
INTERNAL
RESET
MEASUREMENT
IN PROGRESS
(INTERNAL ON
7216B)
40ms
60ms
40ms
UPDATE
190ms TO 200ms
FUNCTION:
TIME INTERVAL
PRIMING
MEASUREMENT INTERVAL
UPDATE
INPUT A
PRIMING EDGES
INPUT B
NOTE:
250ns MIN
MEASURED
INTERVAL
(FIRST)
MEASURED
INTERVAL
(LAST)
5. If range is set to 1 event, first and last measured interval will coincide.
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
30
4.5 ≤ V_DD ≤ 6V
20
10
25^oC
-20^oC
85^oC
0
0
1
2
3
V_DD-V_OUT (V)
FIGURE 3. TYPICAL I_SEG vs V_DD-V_OUT
6