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參數(shù)資料
| 型號： | ICM7216DIPI |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 8-Digit, Multi-Function, Frequency Counters/Timers |
| 中文描述： | LED DISPLAY DRIVER, PDIP28 |
| 封裝： | PLASTIC, MS-011AB, DIP-28 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 642K |
| 代理商： | ICM7216DIPI |
13
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%.
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 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
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
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 14. TEST CIRCUIT (ICM7216A SHOWN, OTHERS SIMILAR)
ICM7216B
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ICM7216DIPI WAF | 制造商:Intersil Corporation 功能描述: |
| ICM7216DLPL | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
| 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 |
| ICM7217A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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