ICM7216A

Manufacturer Part NumberICM7216A
Description8-digit, Multi-function, Frequency Counters/timers
ManufacturerIntersil Corporation
ICM7216A datasheet
 


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August 1997
Features All Versions
• Functions as a Frequency Counter (DC to 10MHz)
• Four Internal Gate Times: 0.01s, 0.1s, 1s, 10s in
Frequency Counter Mode
• Directly Drives Digits and Segments of Large Multi-
plexed LED Displays (Common Anode and Common
Cathode Versions)
• Single Nominal 5V Supply Required
• Highly Stable Oscillator, Uses 1MHz or 10MHz Crystal
• Internally Generated Decimal Points, Interdigit Blanking,
Leading Zero Blanking and Overflow Indication
• Display Off Mode Turns Off Display and Puts Chip Into
Low Power Mode
• Hold and Reset Inputs for Additional Flexibility
Features ICM7216A and ICM7216B
• Functions Also as a Period Counter, Unit Counter,
Frequency Ratio Counter or Time Interval Counter
• 1 Cycle, 10 Cycles, 100 Cycles, 1000 Cycles in Period,
Frequency Ratio and Time Interval Modes
• Measures Period From 0.5 s to 10s
Features ICM7216D
• Decimal Point and Leading Zero Banking May Be
Externally Selected.
Ordering Information
TEMP.
o
PART NUMBER
RANGE (
C)
ICM7216AlJl
-25 to 85
28 Ld CERDIP
ICM7216BlPl
-25 to 85
28 Ld PDIP
ICM7216DlPl
-25 to 85
28 Ld PDIP
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
|
http://www.intersil.com or 407-727-9207
Copyright
ICM7216A, ICM7216B,
Description
The ICM7216A and ICM7216B are fully integrated Timer
Counters with LED display drivers. They combine a high
frequency oscillator, a decade timebase counter, an
8-decade data counter and latches, a 7-segment decoder,
digit multiplexers and 8-segment and 8-digit drivers which
directly drive large multiplexed LED displays. The counter
inputs have a maximum frequency of 10MHz in frequency
and unit counter modes and 2MHz in the other modes. Both
inputs are digital inputs. In many applications, amplification
and level shifting will be required to obtain proper digital
signals for these inputs.
The ICM7216A and ICM7216B can function as a frequency
counter, period counter, frequency ratio (f
interval counter or as a totalizing counter. The counter uses
either a 10MHz or 1MHz quartz crystal timebase. For period
and time interval, the 10MHz timebase gives a 0.1 s
resolution. In period average and time interval average, the
resolution can be in the nanosecond range. In the frequency
mode, the user can select accumulation times of 0.01s, 0.1s,
1s and 10s. With a 10s accumulation time, the frequency
can be displayed to a resolution of 0.1Hz in the least
significant digit. There is 0.2s between measurements in all
ranges.
The ICM7216D functions as a frequency counter only, as
described above.
All versions of the ICM7216 incorporate leading zero
blanking. Frequency is displayed in kHz. In the ICM7216A
and ICM7216B, time is displayed in
multiplexed at 500Hz with a 12.2% duty cycle for each digit.
The ICM7216A is designed for common anode displays with
typical peak segment currents of 25mA. The ICM7216B and
ICM7216D are designed for common cathode displays with
typical peak segment currents of 12mA. In the display off
PKG.
mode, both digit and segment drivers are turned off,
PACKAGE
NO.
enabling the display to be used for other functions.
F28.6
E28.6
E28.6
©
Intersil Corporation 1999
9-10
ICM7216D
8-Digit, Multi-Function,
Frequency Counters/Timers
/f
) counter, time
A
B
s. The display is
3166.1
File Number

ICM7216A Summary of contents

  • Page 1

    ... The ICM7216D functions as a frequency counter only, as described above. All versions of the ICM7216 incorporate leading zero blanking. Frequency is displayed in kHz. In the ICM7216A and ICM7216B, time is displayed in multiplexed at 500Hz with a 12.2% duty cycle for each digit. The ICM7216A is designed for common anode displays with typical peak segment currents of 25mA ...

  • Page 2

    ... CONTROL INPUT MEASUREMENT IN PROGRESS DIGIT 1 OUTPUT DIGIT 3 OUTPUT DIGIT 2 OUTPUT DIGIT 4 OUTPUT DIGIT 5 OUTPUT DIGIT 6 OUTPUT DIGIT 7 OUTPUT DIGIT 8 OUTPUT EX. DECIMAL POINT INPUT ICM7216A, ICM7216B, ICM7216D 28 INPUT A CONTROL INPUT 27 HOLD INPUT INPUT B 26 OSC OUTPUT FUNCTION INPUT 25 OSC INPUT DIGIT 1 OUTPUT ...

  • Page 3

    ... INPUT B (NOTE 1) INPUT CONTROL LOGIC FUNCTION INPUT FN (NOTE 1) CONTROL LOGIC 6 HOLD INPUT NOTES: 1. Function input and input B available on ICM7216A/B only. 2. Ext DP input and MEASUREMENT IN PROGRESS output available on ICM7216D only. ICM7216A, ICM7216B, ICM7216D 3 REFERENCE COUNTER 3 10 RANGE SELECT LOGIC 100Hz ...

  • Page 4

    ... High Output Current Multiplex Inputs: Pins Input Low Voltage, V INL Input High Voltage, V INH Input Resistance ICM7216A, ICM7216B, ICM7216D Thermal Information Thermal Resistance (Typical, Note 2) CERDIP Package . . . . . . . . . . . . . . . . PDIP Package . . . . . . . . . . . . . . . . . . . Maximum Junction Temperature +0.3V -0.3V) CERDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 SS PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Maximum Storage Temperature Range ...

  • Page 5

    ... Segment Driver: Pins 15, 16, 17, 19, 20, 21, 22, 23 High Output Current Leakage Current, I SLK Multiplex Inputs: Pins 1, 13, 14 Input Low Voltage, V lNL Input High Voltage, V INH Input Resistance ICM7216A, ICM7216B, ICM7216D Unless Otherwise Specified (Continued TEST CONDITIONS +1.3V OUT ...

  • Page 6

    ... AS A FUNCTION OF SUPPLY A B ICM7216A, ICM7216B, ICM7216D 60ms FUNCTION: TIME INTERVAL 40ms PRIMING PRIMING EDGES 300 4.5 200 (MAX) PERIOD, 100 FIGURE 3. ICM7216A TYPICAL I 9-15 UPDATE MEASUREMENT INTERVAL xxxxxx xxxxxx xxxxxx 250ns MIN MEASURED INTERVAL (FIRST) MEASURED INTERVAL (LAST ...

  • Page 7

    ... FIGURE 5. ICM7216A TYPICAL I SEG DD OUT - FIGURE 7. ICM7216A TYPICAL I DIGIT OUT 5. (V) OUT 9- 5. 4.5V DD ...

  • Page 8

    ... Select External Oscillator Enable External Decimal Point Enable External DP INPUT (Pin Decimal point is output for same digit 13, ICM7216D Only) that is connected to this input. ICM7216A, ICM7216B, ICM7216D 4.5V INPUT A 0.5V FIGURE 9. WAVEFORM FOR GUARANTEED MINIMUM f FUNCTION = FREQUENCY, FREQUENCY RATIO, UNIT COUNTER more SS 4 ...

  • Page 9

    ... A until a 1-0 transition of input B. This means input A starts the counting and input B stops it. If other ranges, except 0.01s/1 cycle are selected the sequence of input A and B transitions must happen 10, 100 or 1000 times until the ICM7216A, ICM7216B, ICM7216D INTERNAL CONTROL INPUT SELECTOR ...

  • Page 10

    ... Cycle D4 10s/1K Cycle D5 ICM7216A, ICM7216B, ICM7216D low) is stopped, the main counter is reset and the chip is held ready to initiate a new measurement as soon as HOLD goes low. The latches which hold the main counter data are not updated, so the last complete measurement is displayed. ...

  • Page 11

    ... When timing repetitive signals not necessary to “prime” the lCM7216A and lCM7216B as the first alternating signal states automatically prime the device. See Figure 1. During any time interval measurement cycle, the ICM7216A and lCM7216B require 200ms following B going low to update all internal logic. A new measurement cycle will not take place until completion of this internal update time ...

  • Page 12

    ... PERIOD MEASUREMENTS DUE TO LIMITATIONS OF QUANTIZATION ERRORS FIGURE 16. MAXIMUM ACCURACY FOR FREQUENCY RATIO MEASUREMENT DUE TO LIMITATION OF QUANTIZATION ERRORS ICM7216A, ICM7216B, ICM7216D In addition, there is a quantization error inherent in any digital measurement of 1 count. Clearly this error is reduced by dis- playing more digits. In the frequency mode the maximum ...

  • Page 13

    ... LED DP OVERFLOW INDICATOR D8 FIGURE 17. TEST CIRCUIT (ICM7216A SHOWN, OTHERS SIMILAR) Typical Applications The lCM7216 has been designed for use in a wide range of Universal and Frequency counters. In many cases, prescalers will be required to reduce the input frequencies to under 10MHz. Because INPUT A and INPUT B are digital inputs, additional circuitry is often required for input buffering, amplifi ...

  • Page 14

    ... ICM7216B FUNCTION 0 RESET 14 DIGIT DRIVERS D8 D7 ICM7216A, ICM7216B, ICM7216D V DD 10k 100pF HOLD 22M 28 100k RANGE 10k COMMON CATHODE LED DISPLAY ...

  • Page 15

    ... ICM7216A, ICM7216B, ICM7216D INPUT 74LS112 74LS112 10k 100pF ICM7216D 0 RESET ...

  • Page 16

    ... ICM7216A, ICM7216B, ICM7216D INPUT B INPUT A 100pF CK1 CK2 CK1 CK2 74LS90 OR 11C90 11C90 ICM7216A 0 RESET 14 10k F. LED OVERFLOW INDICATOR FIGURE 20. 100MHz MULTIFUNCTION COUNTER ...

  • Page 17

    ... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see web site http://www.intersil.com ICM7216A, ICM7216B, ICM7216D 3k V ...