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參數(shù)資料
| 型號： | ICM7216DlPl |
| 廠商： | Intersil Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-Digit, Multi-Function, Frequency Counters/Timers |
| 中文描述： | 8位數(shù)字，多功能，頻率計數(shù)器/定時器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 141K |
| 代理商： | ICM7216DLPL |
9-22
Test Circuit
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 lCM7216A or lCM7216B can be used as a minimum
component complete Universal Counter as shown in
Figure 18. 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
19 can be used. To obtain the correct measured value, it is
necessary to divide the oscillator frequency by 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 20 shows a frequency
counter with a
÷
10
prescaler and an lCM7216A. Since there
is no external decimal point control with the lCM7216A and
lCM7216B, the decimal point may be controlled externally
with additional drivers as shown in Figure 20. 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 21 additional logic has been added to count the input
directly in
period
mode for maximum accuracy. In Figures 20
and 21, INPUT A comes from Q
C
of the prescaler rather
than Q
D
to obtain an input duty cycle of 40%.
FUNCTION
GENERATOR
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
a
b
c
d
e
f
g
DP
INPUT A
100pF
INPUT B
10K
D1
DP
e
g
D2
D3
D4
D8
D5
F
P
FR
TI.
U.C.
O.F.
RESET
LED
OVERFLOW
INDICATOR
D8
D8
D7
D6
D5
D4
D3
D2
D1
D1
D2
D3
D4
.01/1
.1/10
1/100
10/1K
10k
D1
D2
D3
D4
D5
D6
D7
D8
V
DD
ICM7216A
a
d
b
c
f
V
DD
10k
V
DD
10k
22M
10MHz
CRYSTAL
39pF
TYP
V
DD
DISPLAY
BLANK
DISPLAY
TEST
1MHz
EXT
OSC
TEST
39pF
D4
D8
D2
D1
D5
EXT
OSC
INPUT
TYPICAL CRYSTAL SPECS:
F = 10MHz PARALLEL RESONANCE
C
L
= 22pF
R
S
= <35
FUNCTION
RANGE
8
8
4
6
8
HOLD
FUNCTION
GENERATOR
1N914s
FIGURE 17. TEST CIRCUIT (ICM7216A SHOWN, OTHERS SIMILAR)
ICM7216A, ICM7216B, ICM7216D
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICM7217 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:4 Digit (LED) Presettable Up/Down Counter |
| ICM7217_01 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:4-Digit LED Display, Programmable Up/Down Counter |
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| ICM7217AIJI | 功能描述:LCD 驅(qū)動器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| ICM7217AIPI | 功能描述:LED顯示驅(qū)動器 4-Digit Presettable LED Up/Down Counter RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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