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ICM7217CIPL Datasheet(PDF) 7 Page - Intersil Corporation |
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ICM7217CIPL Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 19 page 9-18 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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