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Intersil Electronic Components Datasheet



ICM7226

8-Digit Multi-Function Frequency Counter/Timer


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ICM7226 pdf
August 1997
ICM7226A,
ICM7226B
8-Digit, Multi-Function,
Frequency Counter/Timer
Features
Description
• CMOS Design for Very Low Power
• Output Drivers Directly Drive Both Digits and
Segments of Large 8-Digit LED Displays
• Measures Frequencies from DC to 10MHz; Periods
from 0.5µs to 10s
• Stable High Frequency Oscillator uses either 1MHz or
10MHz Crystal
• Both Common Anode and Common Cathode Available
• Control Signals Available for External Systems
Interfacing
• Multiplexed BCD Outputs
Applications
• Frequency Counter
• Period Counter
• Unit Counter
• Frequency Ratio Counter
• Time Interval Counter
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ICM7226AlJL
-25 to 85 40 Ld CERDIP
ICM7226BlPL
-25 to 85 40 Ld PDIP
PKG.
NO.
F40.6
E40.6
The ICM7226 is a fully integrated Universal Counter and
LED display driver. It combines a high frequency oscillator, a
decade timebase counter, an 8-decade data counter and
latches, a 7-segment decoder, digit multiplexer and segment
and digit drivers which can directly drive large LED displays.
The counter inputs accept 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 ICM7226 can function as a frequency counter, period
counter, frequency ratio (fA/fB) counter, time interval counter
or as a totalizing counter. The devices require either a
10MHz or 1MHz quartz crystal timebase, or if desired an
external timebase can also be used. 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 dis-
played to a resolution of 0.1Hz. There is 0.2s between mea-
surements in all ranges. Control signals are provided to
enable gating and storing of prescaler data.
Leading zero blanking has been incorporated with frequency
display in kHz and time in µs. The display is multiplexed at a
500Hz rate with a 12.2% duty cycle for each digit. The
ICM7226A is designed for common anode displays with typi-
cal peak segment currents of 25mA, and the ICM7226B is
designed for common cathode displays with typical segment
currents of 12mA. In the display off mode, both digit drivers
and segment drivers are turned off, allowing the display to
be used for other functions.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
9-15
File Number 3169.1



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ICM7226 pdf
Pinouts
ICM7226A, ICM7226B
ICM7226A
COMMON ANODE (CERDIP)
TOP VIEW
CONTROL INPUT 1
INPUT B 2
MEASUREMENT IN PROGRESS 3
FUNCTION 4
STORE 5
BCD 4 6
BCD 8 7
DP 8
SEG e 9
SEG g 10
SEG a 11
VSS 12
SEG d 13
SEG b 14
SEG c 15
SEG f 16
BCD 2 17
BCD 1 18
RST INPUT 19
EXT DP IN 20
40 INPUT A
39 HOLD
38 BUF OSC OUT
37 NC (NOTE 1)
36 OSC OUT
35 OSC IN
34 NC (NOTE 1)
33 EXT OSC IN
32 RST OUT
31 EXT RANGE
30 D1
29 D2
28 D3
27 D4
26 D5
25 VDD
24 D6
23 D7
22 D8
21 RANGE
ICM7226B
COMMON CATHODE (PDIP)
TOP VIEW
CONTROL INPUT 1
INPUT B 2
MEASUREMENT IN PROGRESS 3
FUNCTION 4
STORE 5
BCD 4 6
BCD 8 7
D1 8
D3 9
D2 10
D4 11
VSS 12
D5 13
D6 14
D7 15
D8 16
BCD 2 17
BCD 1 18
RST INPUT 19
EXT DP IN 20
NOTE:
1. For maximum frequency stability, connect to VDD or VSS.
40 INPUT A
39 HOLD
38 BUF OSC OUT
37 NC (NOTE 1)
36 OSC OUT
35 OSC IN
34 NC (NOTE 1)
33 EXT OSC IN
32 RST OUT
31 EXT RANGE
30 DP OUT
29 SEG g
28 SEG e
27 SEG a
26 SEG d
25 VDD
24 SEG b
23 SEG c
22 SEG f
21 RANGE
9-16



Part Number ICM7226
Description 8-Digit Multi-Function Frequency Counter/Timer
Maker Intersil Corporation - Intersil Corporation
Total Page 19 Pages
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