ICM7226 Datasheet PDF - Intersil Corporation

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ICM7226
Intersil Corporation

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


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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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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
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Functional Block Diagram
ICM7226A, ICM7226B
EXT OSC
INPUT
OSC
INPUT
OSC
OUTPUT
BUF OSC
OUTPUT
RESET
INPUT
INPUT A
INPUT B
OSC
SELECT
DECODER
3
8 DIGIT
DRIVERS
104 OR 100Hz
105
STORE
AND RESET
LOGIC
REFERENCE
COUNTER
+103
RANGE
SELECT
LOGIC
DIGIT
OUTPUTS
8 (8)
RANGE
CONTROL
LOGIC
5
RANGE
INPUT
EXT RANGE
INPUT
INPUT
CONTROL
LOGIC
INPUT
CONTROL
LOGIC
MAIN
EN COUNTER
CL ÷103
RESET
OVERFLOW
4 4 44 44 44
8
DATA LATCHES
OUTPUT MUX
STORE
DQ
CL MAIN
FF
R
4
CONTROL
6
LOGIC
CONTROL
INPUT
DP
LOGIC
EXT
DP
INPUT
DECODER
AND LZB
LOGIC 7
SEGMENT
DRIVERS 8
SEGMENT
OUTPUTS
(8)
FUNCTION
INPUT
MEAS IN
PROGRESS
OUTPUT
HOLD
INPUT
FN
CONTROL
LOGIC
6
44
BCD
OUTPUTS
(4)
RESET
OUTPUT
STORE
OUTPUT
9-17



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ICM7226A, ICM7226B
Absolute Maximum Ratings
Maximum Supply Voltage (VDD - VSS). . . . . . . . . . . . . . . . . . . . 6.5V
Maximum Digit Output Current . . . . . . . . . . . . . . . . . . . . . . . . 400mA
Maximum Segment Output Current . . . . . . . . . . . . . . . . . . . . . 60mA
Voltage On Any Input or
Output Terminal (Note 1) . . . . . . . . . . . . . . VDD +0.3V to VSS -0.3V
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -25oC to 85oC
Thermal Information
Thermal Resistance (Typical, Note 2)
θJA (oC/W) θJC (oC/W)
CERDIP Package . . . . . . . . . . . . . . . .
45
9
PDIP Package . . . . . . . . . . . . . . . . . . .
50
N/A
Maximum Junction Temperature
CERDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175oC
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .-55oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. Destructive latchup may occur if input signals are applied before the power supply is established or if inputs or outputs are forced to
voltages exceeding VDD or VSS by 0.3V.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications VDD = 5.0V, TA = 25oC, Unless Otherwise Specified
PARAMETER
TEST CONDITIONS
Operating Supply Current, IDD
Supply Voltage Range (VDD -VSS), VSUPPLY
Maximum Frequency INPUT A, Pin 40, fA(MAX)
Display Off, Unused Inputs to VSS
-25oC to 85oC, INPUT A,
INPUT B Frequency at fMAX
-25oC to 85oC
4.75V < VDD < 6.0V, Figure 9
Function = Frequency, Ratio,
Unit Counter
Function = Period, Time Interval
Maximum Frequency INPUT B, Pin 2, fB(MAX)
Minimum Separation INPUT A to INPUT B,
Time Interval Function
Oscillator Frequency and External Oscillator Frequency,
fOSC
Oscillator Transconductance, gM
-25oC to 85oC
4.75V < VDD < 6.0V, Figure 10
-25oC to 85oC
4.75V < VDD < 6.0V, Figure 1
-25oC to 85oC
4.75V < VDD < 6.0V
VDD -4.75V, TA = 85oC
Multiplex Frequency, fMUX
fOSC = 10MHz
Time Between Measurements
fOSC = 10MHz
Input Rate of Charge, dVIN/dt
Inputs A, B
Input Voltages: Pins 2, 19, 33, 39, 40, 35
Input Low Voltage, VIL
-25oC to 85oC
Input High Voltage, VlH
Pins 2, 39, 40, Input Leakage, A, B, IILK
Input Resistance to VDD Pins 19, 33, RIN
VIN = VDD -1.0V
Input Resistance to VSS Pin 31, RIN
VIN = +1.0V
Output Current
Low Output Current, Pins 3, 5-7, 17, 18, 32, 38, IOL VOL = +0.4V
High Output Current, Pins 5-7, 17, 18, 32, HOL
VOH = +2.4V
High Output Current, Pins 3, 38, HOL
VOH = VDD -0.8V
ICM7226A
Segment Driver: Pins 8-11, 13-16
Low Output Current, IOL
High Output Current, IOH
VO = +1.5V
VO = VDD -1.0V
MIN TYP MAX UNITS
- 2 5 mA
4.75 - 6.0 V
10 14
- MHz
2.5 -
2.5 -
250 -
0.1 -
2000
-
-
-
-
500
200
15
--
3.5 -
--
100 400
50 100
400 -
100 -
265 -
- MHz
- MHz
- ns
10 MHz
- µS
- Hz
- ms
- mV/µs
1.0 V
-V
20 µA
- k
- k
- µA
- µA
- µA
25 35 - mA
- 100 -
µA
9-18



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