1

®

FN3166.4

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ICM7216B, ICM7216D

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 0.1

µs 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 0.5

µs to 10s

Features, ICM7216D

• Decimal point and leading zero banking may be externally

selected

Part Number Information

PART

NUMBER

TEMP. RANGE

PACKAGE

PKG. NO.

ICM7216BlPl

-25 to 85

28 Ld PDIP

E28.6

ICM7216DlPl

-25 to 85

28 Ld PDIP

E28.6

Data Sheet

January 2004

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