ICM7217CIPL datasheet(7/19 Pages) INTERSIL

Part #	ICM7217CIPL

Description	4-Digit LED Display, Programmable Up/Down Counter

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Manufacturer	INTERSIL [Intersil Corporation]

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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.

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 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

>60

µA. A 10kΩ pull-up resistor to VDD 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 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-

sponding to average segment currents of 3.1mA. Figure 1

shows the multiplex timing. The DISPLAY pin controls the

display output using three level logic. The pin is self-biased

to a voltage approximately 1/2 (VDD); this corresponds to

normal operation. When this pin is connected to VDD, the

segments are disabled and when connected to VSS, the

leading zero blanking feature is inhibited. For normal opera-

tion (display on with leading zero blanking) the pin should be

left open. The display may be controlled with a 3 position

SPDT switch; see Test Circuit.

Multiplex SCAN Oscillator

The on-board multiplex scan oscillator has a nominal free-

running frequency of 2.5kHz. This may be reduced by the

addition of a single capacitor between the SCAN pin and the

positive supply. Capacitor values and corresponding nominal

oscillator frequencies, digit repetition rates, and loading

times are shown in Table 1.

FIGURE 10A.

FIGURE 10B.

FIGURE 10C.

FIGURE 10. BRIGHTNESS CONTROL CIRCUITS

R2

20k

Ω

1M

Ω

0.01

µF

C

SCAN INPUT

ICM7217

R1

10k

Ω

1M

Ω

0.01

µF

SCAN INPUT

ICM7217

500

Ω

500

Ω

3k

Ω

0.05

µF

SCAN INPUT

ICM7217

10k

Ω

200

Ω

0.05

µF

74

8

3

2

61

8s

ICM7555

0V

VDD = 5V

ICM7217

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