ICM7217_01 Datasheet, PDF (7/20 Pages) Intersil Corporation – 4-Digit LED Display, Programmable Up/Down Counter

Typical Performance Curves
80
V+ = 5V
60 ^ICM7217
ICM7217B
-20^oC
40
25^oC
20
85^oC
0
0
1
2
V_OUT (V)
FIGURE 6. TYPICAL ISEG vs V_OUT
200
T_A = 25^oC
150
V+ = 5.5V
ICM7217A
ICM7217C
100
V+ = 4.5V
V+ = 5V
50
ICM7217
200
V+ = 5V
150
ICM7217A
ICM7217C
-20^oC
100
25^oC
50
85^oC
0
3
0
1
2
3
V_OUT (V)
FIGURE 7. TYPICAL IDIGIT vs V_OUT
30
4.5 ≤ V_DD − V_SS ≤ 6V
25^oC
20 ^ICM7217A
ICM7217C
10
-20^oC
85^oC
0
0
1
2
3
V_OUT (V)
FIGURE 8. TYPICAL IDIGIT vs V_OUT
0
0
1
2
3
V_DD - V_OUT (V)
FIGURE 9. TYPICAL ISEG vs V_DD - V_OUT
Detailed Description
Control Outputs
The CARRY/BORROW output is a positive going pulse
occurring typically 500ns after the positive going edge of the
COUNT INPUT. It occurs when the counter is clocked from
9999 to 0000 when counting up and from 0000 to 9999 when
counting down. This output allows direct cascading of
counters. The CARRY/BORROW output is not valid during
load counter and reset operation. When the count is 6000 or
higher, a reset generates a CARRY/BORROW pulse.
drive a single TTL load over the full range of supply voltage
and ambient temperature; for a logic zero, these outputs will
sink 1.6mA at 0.4V and for a logic one, the outputs will
source >60µA. A 10kΩ pull-up resistor to V_DD on the
EQUAL or ZERO outputs is recommended for highest speed
operation, and on the CARRY/BORROW output when it is
being used for cascading. Figure 2 shows control outputs
timing diagram.
Display Outputs and Control
The EQUAL output assumes a negative level when the
contents of the counter and register are equal.
The ZERO output assumes a negative level when the
content of the counter is 0000.
The CARRY/BORROW, EQUAL and ZERO outputs will
The Digit and SEGment drivers provide a decoded
7-segment display system, capable of directly driving com-
mon anode LED displays at typical peak currents of
35mA/seg. This corresponds to average currents of
8mA/seg at 25% multiplex duty cycle. For the common cath-
ode versions, peak segment currents are 12.5mA, corre-
7