- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383092 > ICM7226AlJL (Intersil Corporation) LJT 128C 128#22D PIN RECP PDF資料下載
參數(shù)資料
| 型號： | ICM7226AlJL |
| 廠商： | Intersil Corporation |
| 英文描述： | LJT 128C 128#22D PIN RECP |
| 中文描述： | 8位數(shù)字，多功能，頻率計數(shù)器/計時器 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 173K |
| 代理商： | ICM7226ALJL |
9-28
Typical Applications
The ICM7226 has been designed as a complete stand alone
Universal Counter, or used with prescalers and other circuitry
in a variety of applications. Since INPUT A and INPUT B are
digital inputs, additional circuitry will be required in many
applications, for input buffering, amplification, hysteresis, and
level shifting to obtain the required digital voltages. For many
applications a FET source follower can be used for input buff-
ering, and an ECL 10116 line receiver can be used for amplifi-
cation and hysteresis to obtain high impedance input,
sensitivity and bandwidth. However, cost and complexity of
this circuitry can vary widely, depending upon the sensitivity
and bandwidth required. When TTL prescalers or input buffers
are used, a pull up resistors to V
DD
should be used to obtain
optimal voltage swing at INPUTS A and B. If prescalers aren’t
required, the ICM7226 can be used to implement a minimum
component Universal Counter as shown in Figure 20.
For input frequencies up to 40MHz, the circuit shown in
Figure 21 can be used to implement a
frequency and
period counter
. To obtain the correct value when measuring
frequency and period, it is necessary to divide the 10MHz
oscillator frequency down to 2.5MHz. In doing this the time
between measurements is lengthened to 800ms and the dis-
play multiplex rate is decreased to 125Hz.
If the input frequency is prescaled by ten, the oscillator
frequency can remain at either 10MHz or 1MHz, but the
decimal point must be moved. Figure 22 shows use of a
÷
10
prescaler in
frequency counter
mode. Additional logic has
been added to enable the ICM7226 to count the input
directly in
period
mode for maximum accuracy.
D8
HOLD
13
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
17
18
19
20
28
40
39
38
37
36
35
34
33
32
31
30
29
27
26
25
24
23
22
21
EXT OSC IN
39pF
10k
D3
D2
D1
D2
D3
D4
D8
D5
g
e
a
d
b
c
f
RESET
D8
D7
D6
D5
D4
D3
D2
D1
8
6
V
DD
100k
V+
V+
22M
10MHz
CRYSTAL
V+
39pF
39pF (TYP)
V+
DP
D5
D6
D7
D8
V
DD
D1
D2
D3
100k
D4
4
DISPLAY
TEST
D8
D1
1N914s
DISPLAY
BLANK
D4
TYPICAL
CRYSTAL
PARAMETERS
C
L
R
S
22pF
35
a
b
c
d
e
f
g
DP
0.1
μ
F
ICM7226B
D4
B IN
A IN
V
DD
10k
8
EXT OSC
ENABLE
3
FIGURE 20. 10MHz UNIVERSAL COUNTER
ICM7226A, ICM7226B
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICM7228 | 8-Digit, Microprocessor-Compatible, LED Display Decoder Driver(8位數(shù)字LED顯示驅(qū)動器) |
| ICM7240IJE | Fixed And Programmable Timer/Counters |
| ICM7250IJE | Fixed And Programmable Timer/Counters |
| ICM7260IJE | Fixed And Programmable Timer/Counters |
| ICM7240IPE | Fixed And Programmable Timer/Counters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICM7226B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counter/Timer |
| ICM7226BIPL | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TIMERS COUNTERS AND DISPLAY DRIVERS |
| ICM7226BIPL WAF | 制造商:Intersil Corporation 功能描述: |
| ICM7226BLPL | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counter/Timer |
| ICM7226D | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TIMERS COUNTERS AND DISPLAY DRIVERS |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。