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PDF ICM7216D Data sheet ( Hoja de datos )

Número de pieza ICM7216D
Descripción (ICM7216x) 8-Digit / Multi-Function / Frequency Counters/Timers
Fabricantes Intersil Corporation 
Logotipo Intersil Corporation Logotipo



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No Preview Available ! ICM7216D Hoja de datos, Descripción, Manual

August 1997
ICM7216A, ICM7216B,
ICM7216D
8-Digit, Multi-Function,
Frequency Counters/Timers
Features All Versions
Description
• 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 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 ICM7216A and 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 0.5µs to 10s
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.
The ICM7216D functions as a frequency counter only, as
described above.
Features ICM7216D
• Decimal Point and Leading Zero Banking May Be
Externally Selected.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ICM7216AlJl
-25 to 85 28 Ld CERDIP
PKG.
NO.
F28.6
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.
ICM7216BlPl
-25 to 85 28 Ld PDIP
E28.6
ICM7216DlPl
-25 to 85 28 Ld PDIP
E28.6
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
9-10
File Number 3166.1

1 page




ICM7216D pdf
ICM7216A, ICM7216B, ICM7216D
Electrical Specifications VDD = 5.0V, VSS = 0V, TA = 25oC, Unless Otherwise Specified (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP
ICM7216B
Digit Driver: Pins 4, 5, 6, 7, 9, 10, 11, 12
Low Output Current, IOL
High Output Current, IOH
Segment Driver: Pins 15, 16, 17, 19, 20, 21, 22, 23
High Output Current, IOH
Leakage Current, ISLK
Multiplex Inputs: Pins 1, 3, 14
Input Low Voltage, VINL
Input High Voltage, VlNH
Input Resistance to VDD, RIN
ICM7216D
VOUT = VSS +1.3V
VOUT = VDD -2.5V
VOUT = VDD -2.0V
VOUT = VDD -2.5V
VlN = VDD -2.5V
50 75
- -100
-10 -
--
-
VDD -0.8
100
-
-
360
Operating Supply Current, IDD
Display Off, Unused Inputs to VSS
Supply Voltage Range (VDD -VSS), VSUPPLY
INPUT A Frequency at fMAX
Maximum Frequency INPUT A, Pin 28, fA(MAX)
Figure 9
Maximum Oscillator Frequency and External Oscillator
Frequency, fOSC
Minimum External Oscillator Frequency, fOSC
Oscillator Transconductance, gM
VDD = 4.75V, TA = 85oC
Multiplex Frequency, fMUX
fOSC = 10MHz
Time Between Measurements
fOSC = 10MHz
Input Voltages: Pins 12, 27, 28
Input Low Voltage, VINL
Input High Voltage, VINH
Input Resistance to VDD, Pins 12, 24, RIN
VIN = VDD -1.0V
Input Leakage, Pins 27, 28, IILK
Output Current, Pin 2, IOL
VOL = +0.4V
Output Current, Pin 2, IOH
VOH = VDD -0.8V
Input Rate of Change, dVlN/dt
Supplies Well Bypassed
Digit Driver: Pins 3, 4, 5, 6, 8, 9, 10, 11
Low Output Current, IOL
VOUT = +1.3V
High Output Current, IOH
VOUT = VDD -2.5V
Segment Driver: Pins 15, 16, 17, 19, 20, 21, 22, 23
High Output Current, IOH
VOUT = VDD -2.0V
Leakage Current, ISLK
VOUT = VDD -2.5V
Multiplex Inputs: Pins 1, 13, 14
Input Low Voltage, VlNL
Input High Voltage, VINH
Input Resistance to VDD, RlN
VIN = VDD -1.0V
-
4.75
10
10
-
2000
-
-
2
-
-
-
-
-
500
200
--
3.5 -
100 400
--
0.36 -
265 -
- 15
50 75
- 100
10 15
--
-
VDD -0.8
100
-
-
360
MAX UNITS
- mA
- µA
- mA
10 µA
VDD -2.0
-
-
V
V
k
5 mA
6.0 V
- MHz
- MHz
100 kHz
- µS
- Hz
- ms
1.0 V
-V
- k
20 µA
- mA
- µA
- mV/µs
- mA
- µA
mA
10 µA
VDD -2.0
-
-
V
V
k
9-14

5 Page





ICM7216D arduino
ICM7216A, ICM7216B, ICM7216D
Time Interval Measurement
When in the time interval mode and measuring a single
event, the lCM7216A and lCM7216B must first be “primed”
prior to measuring the event of interest. This is done by first
generating a negative going edge on Channel A followed by a
negative going edge on Channel B to start the “measurement
interval”. The inputs are then primed ready for the measure-
ment. Positive going edges on A and B, before or after the
priming, will be needed to restore the original condition.
Priming can be easily accomplished using the circuit in
Figure 13.
VDD
SIGNAL A
SIGNAL B
VDD
2 INPUT A
2 INPUT B
N.O.
PRIME
1
150K
1
1 10K
1
100K
VSS
1N914
0.1µF
VSS
10nF
VSS
DEVICE
1
2
TYPE
CD4049B Inverting Buffer
CD4070B Exclusive - OR
FIGURE 13. PRIMING CIRCUIT, SIGNALS A AND B BOTH HIGH
OR LOW
Following the priming procedure (when in single event or 1
cycle range) the device is ready to measure one (only)
event.
When timing repetitive signals, it is not necessary to “prime”
the lCM7216A and lCM7216B as the first alternating signal
states automatically prime the device. See Figure 1.
During any time interval measurement cycle, the ICM7216A
and lCM7216B require 200ms following B going low to
update all internal logic. A new measurement cycle will not
take place until completion of this internal update time.
Oscillator Considerations
The oscillator is a high gain CMOS inverter. An external
resistor of 10Mto 22Mshould be connected between the
OSCillator INPUT and OUTPUT to provide biasing. The
oscillator is designed to work with a parallel resonant 10MHz
quartz crystal with a static capacitance of 22pF and a series
resistance of less than 35.
For a specific crystal and load capacitance, the required gM
can be calculated as follows:
gM
=
ω2
CIN
COUT
RS
1
+
C-C----O-L--  2
where CL = C---C--I--N-I--N--+--C---C--O---O-U---U-T---T--
CO = Crystal Static Capacitance
RS = Crystal Series Resistance
CIN = Input Capacitance
COUT = Output Capacitance
ω = 2πf
The required gM should not exceed 50% of the gM specified
for the lCM7216 to insure reliable startup. The OSCillator
INPUT and OUTPUT pins each contribute about 5pF to CIN
and COUT. For maximum stability of frequency, CIN and
COUT should be approximately twice the specified crystal
static capacitance.
In cases where non decade prescalers are used it may be
desirable to use a crystal which is neither 10MHz or 1MHz.
In that case both the multiplex rate and time between mea-
surements will be different. The multiplex rate is
fMUX = 2---f--O×-----S1----0C---4- for 10MHz mode and fMUX = -2--f--O×-----S1----0C---3- for
the 1MHz mode. The time between measurements is
2---f--O×-----S1----0C---6- in the 10MHz mode and -2--f--O×-----S1----0C---5- in the 1MHz mode.
The crystal and oscillator components should be located as
close to the chip as practical to minimize pickup from other
signals. Coupling from the EXTERNAL OSClLLATOR INPUT
to the OSClLLATOR OUTPUT or INPUT can cause undesir-
able shifts in oscillator frequency.
Display Considerations
The display is multiplexed at a 500Hz rate with a digit time of
244µs. An interdigit blanking time of 6µs is used to prevent
display ghosting (faint display of data from previous digit
superimposed on the next digit). Leading zero blanking is
provided, which blanks the left hand zeroes after decimal
point or any non zero digits. Digits to the right of the decimal
point are always displayed. The leading zero blanking will be
disabled when the Main Counter overflows.
The lCM7216A is designed to drive common anode LED
displays at peak current of 25mA/segment, using displays
with VF = 1.8V at 25mA. The average DC current will be over
3mA under these conditions. The lCM7216B and lCM7216D
are designed to drive common cathode displays at peak cur-
rent of 15mA/segment using displays with VF = 1.8V at
15mA. Resistors can be added in series with the segment
drivers to limit the display current in very efficient displays, if
required. The Typical Performance Curves show the digit
and segment currents as a function of output voltage.
To get additional brightness out of the displays, VDD may be
increased up to 6.0V. However, care should be taken to see
that maximum power and current ratings are not exceeded.
The segment and digit outputs in lCM7216s are not directly
compatible with either TTL or CMOS logic when driving
LEDs. Therefore, level shifting with discrete transistors may
be required to use these outputs as logic signals.
9-20

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