Datasheet ICM7216A (Intersil)

ICM7216A, ICM7216B S E M I C O N D U C T O R ICM7216D 8-Digit Multi-Function
December 1993
Frequency Counter/Timer
The ICM7216A and ICM7216B are fully integrated Timer
Features All Versions
Counters with LED display drivers. They combine a high
• Functions as a Frequency Counter (DC to 10MHz)
frequency oscillator, a decade timebase counter, an 8-decade data counter and latches, a 7-segment decoder,
• Four Internal Gate Times: 0.01s, 0.1s, 1s, 10s in
digit multiplexers and 8 segment and 8 digit drivers which
Frequency Counter Mode
directly drive large multiplexed LED displays. The counter
• Directly Drives Digits and Segments of Large Multi-
inputs have a maximum frequency of 10MHz in frequency
plexed LED Displays (Common Anode and Common
and unit counter modes and 2MHz in the other modes. Both
Cathode Versions)
inputs are digital inputs. In many applications, amplification and level shifting will be required to obtain proper digital
• Single Nominal 5V Supply Required
signals for these inputs.
• Highly Stable Oscillator, Uses 1MHz or 10MHz Crystal
The ICM7216A and ICM7216B can function as a frequency
• Internally Generated Decimal Points, Interdigit Blank-
counter, period counter, frequency ratio (fA/fB) counter, time
ing, Leading Zero Blanking and Overflow Indication
interval counter or as a totalizing counter. The counter uses either a 10MHz or 1MHz quartz crystal timebase. For period
• Display Off Mode Turns Off Display and Puts Chip Into
and time interval, the 10MHz timebase gives a 0.1µs
Low Power Mode
resolution. In period average and time interval average, the
• Hold and Reset Inputs for Additional Flexibility
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
Features ICM7216A and ICM7216B
can be displayed to a resolution of 0.1Hz in the least
• Functions Also as a Period Counter, Unit Counter,
significant digit. There is 0.2s between measurements in all
Frequency Ratio Counter or Time Interval Counter
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 0.5
µ
s to 10s
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
Features ICM7216D
multiplexed at 500Hz with a 12.2% duty cycle for each digit.
• Decimal Point and Leading Zero Banking May Be
The ICM7216A is designed for common anode displays with
Externally Selected
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
Ordering Information
mode, both digit and segment drivers are turned off, enabling the display to be used for other functions.
TEMPERATURE PART NUMBER RANGE PACKAGE
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. File Number
3166
Copyright © Harris Corporation 1993 13-22