ICM7216B_04 Datasheet, PDF (1/18 Pages) Intersil Corporation – 8-Digit, Multi-Function, Frequency Counters/Timers

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ICM7216B, ICM7216D
January 2004
FN3166.4
8-Digit, Multi-Function, Frequency
Counters/Timers
The ICM7216B is a 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 ICM7216B can function as a frequency counter, period
counter, frequency ratio (fA/fB) counter, time 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 0.1µs 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 ICM7216B,
time is displayed in µs. The display is multiplexed at 500Hz
with a 12.2% duty cycle for each digit. The ICM7216B and
ICM7216D are designed for common cathode displays with
typical peak segment currents of 12mA. In the display off
mode, both digit and segment drivers are turned off,
enabling the display to be used for other functions.
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 multiplexed
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, 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 0.5µs to 10s
Features, ICM7216D
• Decimal point and leading zero banking may be externally
selected
Part Number Information
PART
NUMBER
ICM7216BlPl
ICM7216DlPl
TEMP. RANGE
(^oC)
PACKAGE PKG. NO.
-25 to 85 28 Ld PDIP E28.6
-25 to 85 28 Ld PDIP E28.6
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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