ICM7224 Intersil Corporation, ICM7224 Datasheet
ICM7224
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ICM7224 Summary of contents
Page 1
... Description The ICM7224 device is a high-performance, CMOS 4 digit counter, including decoder, output latch, display driver, count inhibit, leading zero blanking, and reset circuitry. The counter section provides direct static counting, guaran- teed from DC to 15MHz, using a 5V ±10% supply over the operating temperature range ...
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... BLANKING OUTPUT COUNT Q CL INHIBIT ÷ ÷ 2 SCHMITT COUNT CL TRIGGER INPUT R R RESET OSCILLATOR OSCILLATOR INPUT ENABLE DETECTOR ICM7224 DIGIT 2 DIGIT 3 SEGMENT OUTPUTS SEGMENT OUTPUTS 7 WIDE DRIVER 7 WIDE DRIVER 7 WIDE LATCH 7 WIDE LATCH DECODER DECODER ÷ ÷ ÷ ...
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... Due to the SCR structure inherent in the CMOS process, connecting any terminal to voltages greater than V cause destructive device latchup. For this reason recommended that no inputs from sources operating on a different power supply be applied to the device before its supply is established, and that in multiple supply systems, the supply to the ICM7224 be turned on first. 2. θ ...
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... SUPPLY VOLTAGE (V) FIGURE 4. MAXIMUM COUNT FREQUENCY (TYPICAL FUNCTION OF SUPPLY VOLTAGE TERMINAL INPUT 29 Leading Zero Blanking INput 31 COUNT INHIBIT 33 RESET 34 STORE ICM7224 1000 LCD DEVICES -20 C 100 FIGURE 3. BACKPLANE FREQUENCY AS A FUNCTION OF OSCILLATOR CAPACITOR C ...
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... Actual input low and high levels are specified in the Operating Characteristics. For lowest power consumption, input signals should swing over the full supply. Detailed Description The ICM7224 provides outputs suitable for driving conven- 1 tional 4 / digit by seven segment LCD displays. It includes ...
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... An ICM7207A device is used as a timebase generator and frequency counter controller. It generates count window, store and reset signals which are directly compatible with ICM7224 inputs (notice the need for an inverter at COUNT INHIBIT input). The ICM7207A provides two count window signals (1s and 0.1s gating) for displaying frequencies tens of Hz (x10Hz) ...
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... ICM7207A C C OUT IN FIGURE 8. EIGHT-DIGIT PRECISION FREQUENCY COUNTER ICM7224 HIGH ORDER DIGITS LOW ORDER DIGITS 3 SEG 1 BACKPLANE 4 SEG 15 SEG 6 SEG ICM7224 LOW ORDER DIGITS MASTER BACKPLANE SWITCH OPEN 1 / CD4069C GATING SWITCH CLOSED s 0.1 GATING CRYSTAL C = 22pF 22pF ...