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参数资料
| 型号： | ICM7216DIPI |
| 厂商： | Intersil |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC COUNTER/TIMER FREQ 8DIG 28DIP |
| 标准包装： | 78 |
| 系列： | * |
| 其它名称： | 7216DIPI NT5007 |
ICM7216B, ICM7216D
Test Circuit
V DD
V DD
FUNCTION
INPUT A
V DD
DISPLAY DISPLAY
EXT
GENERATOR
BLANK
TEST
1MHz
OSC
TEST
FUNCTION
100pF
HOLD
10k ?
10k ?
39pF
39pF
TYP
GENERATOR
F
FUNCTION
INPUT B
10K
DP
D1
e
1
2
3
4
5
28
27
26
25
24
22M ?
10MHz
CRYSTAL
D4
D8
D2
1N914s
D1
EXT
OSC
INPUT
D5
P
FR
D8
D2
g
a
6
7
23
22
D1
D2
8
TYPICAL CRYSTAL SPECS:
TI.
U.C.
O.F.
D5
D4
D3
d
b
8
9
10
ICM7216A
21
20
19
D3
D4
D5
F = 10MHz PARALLEL RESONANCE
C L = 22pF
R S = <35 ?
c
f
11
12
18
17
D6
V DD
RESET
13
14
16
15
D7
D8
10k ?
D1
RANGE
.01/1
D2
.1/10
4
6
8
a
D4
D3
1/100
10/1K
b
c
d
e
8
LED
OVERFLOW
f
g
DP
INDICATOR
D8
D8
D7
D6
D5
D4
D3
D2
D1
FIGURE 14. TEST CIRCUIT (ICM7216A SHOWN, OTHERS SIMILAR)
Typical Applications
The lCM7216 has been designed for use in a wide range of
Universal and Frequency counters. In many cases, prescalers
will be required to reduce the input frequencies to under 10MHz.
Because INPUT A and INPUT B are digital inputs, additional
circuitry is often required for input buffering, amplification,
hysteresis, and level shifting to obtain a good digital signal.
The lCM7216B can be used as a minimum component
complete Universal Counter as shown in Figure 15. This
circuit can use input frequencies up to 10MHz at INPUT A
and 2MHz at INPUT B. If the signal at INPUT A has a very
low duty cycle it may be necessary to use a 74LS121
monostable multivibrator or similar circuit to stretch the input
pulse width to be able to guarantee that it is at least 50ns in
duration.
To measure frequencies up to 40MHz the circuit of
Figure 16 can be used. To obtain the correct measured
value, it is necessary to divide the oscillator frequency by
13
four as well as the input frequency. In doing this the time
between measurements is also lengthened to 800ms and
the display multiplex rate is decreased to 125Hz.
If the input frequency is prescaled by ten, then the oscillator
can remain at 10MHz or 1MHz, but the decimal point must
be moved one digit to the right. Figure 17 shows a frequency
counter with a ÷ 10 prescaler and an lCM7216A. Since there
is no external decimal point control with the lCM7216B, the
decimal point may be controlled externally with additional
drivers as shown in Figure 17. Alternatively, if separate
anodes are available for the decimal points, they can be
wired up to the adjacent digit anodes. Note that there can be
one zero to the left of the decimal point since the internal
leading zero blanking cannot be changed. In Figure 18
additional logic has been added to count the input directly in
period mode for maximum accuracy. In Figures 17 and 18,
INPUT A comes from QC of the prescaler rather than QD to
obtain an input duty cycle of 40%.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICM7216DIPI WAF | 制造商:Intersil Corporation 功能描述: |
| ICM7216DLPL | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7217 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4 Digit (LED) Presettable Up/Down Counter |
| ICM7217_01 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:4-Digit LED Display, Programmable Up/Down Counter |
| ICM7217A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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