ICM7216DLPL 查看數據表（PDF） - Harris Semiconductor

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ICM7216DLPL

8-Digit Multi-Function Frequency Counter/Timer

Harris Semiconductor 

SEMICONDUCTOR

December 1993

ICM7216A, ICM7216B

ICM7216D

8-Digit Multi-Function

Frequency Counter/Timer

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 Blank-

ing, 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

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 (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.

• 1 Cycle, 10 Cycles, 100 Cycles, 1000 Cycles in Period, The ICM7216D functions as a frequency counter only, as

Frequency Ratio and Time Interval Modes

described above.

• Measures Period From 0.5µs to 10s

Features ICM7216D

• Decimal Point and Leading Zero Banking May Be

Externally Selected

Ordering Information

PART NUMBER

TEMPERATURE

RANGE

PACKAGE

All versions of the ICM7216 incorporate leading zero

blanking. Frequency is displayed in kHz. In the ICM7216A

and ICM7216B, time is displayed in µs. The display is

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

mode, both digit and segment drivers are turned off,

enabling the display to be used for other functions.

ICM7216AlJl

-25oC to +85oC 28 Lead Ceramic DIP

ICM7216BlPl

-25oC to +85oC 28 Lead Plastic DIP

ICM7216DlPl

-25oC to +85oC 28 Lead Plastic DIP

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.

Copyright © Harris Corporation 1993

13-22

File Number 3166

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