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參數(shù)資料
| 型號(hào)： | ICM7556 |
| 廠商： | Intersil Corporation |
| 英文描述： | General Purpose Timers(通用定時(shí)器) |
| 中文描述： | 低功耗、通用定時(shí)器 |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大?。?/td> | 287K |
| 代理商： | ICM7556 |
5
FN2867.9
August 24, 2006
Schematic Diagram
Application Information
General
The ICM7555 and ICM7556 devices are, in most instances,
direct replacements for the NE/SE 555/6 devices. However,
it is possible to effect economies in the external component
count using the ICM7555 and ICM7556. Because the bipolar
NE/SE 555/6 devices produce large crowbar currents in the
output driver, it is necessary to decouple the power supply
lines with a good capacitor close to the device. The ICM7555
and ICM7556 devices produce no such transients. See
Figure 1.
The ICM7555 and ICM7556 produce supply current spikes
of only 2mA - 3mA instead of 300mA - 400mA and supply
decoupling is normally not necessary. Also, in most
instances, the CONTROL VOLTAGE decoupling capacitors
are not required since the input impedance of the CMOS
comparators on chip are very high. Thus, for many
applications, two capacitors can be saved using an ICM7555
and three capacitors with an ICM7556.
POWER SUPPLY CONSIDERATIONS
Although the supply current consumed by the ICM7555 and
ICM7556 devices is very low, the total system supply current
can be high unless the timing components are high
impedance. Therefore, use high values for R and low values
for C in Figures 2A, 2B, and 3.
RESET
DISCHARGE
TRIGGER
THRESHOLD
GND
OUTPUT
CONTROL
VOLTAGE
R
N
N
NPN
P
R
R
V
DD
N
N
N
N
N
P
P
N
N
P
P
P
R = 100k
Ω
±
20% (TYP)
TIME (ns)
400
800
600
200
0
0
100
200
300
400
500
S
SE/NE555
T
A
= 25°C
ICM7555/56
FIGURE 1. SUPPLY CURRENT TRANSIENT COMPARED WITH
A STANDARD BIPOLAR 555 DURING AN OUTPUT
TRANSITION
GND
TRIGGER
O
RESET
1
2
3
4
8
7
6
5
V
DD
DISCHARGE
THRESHOLD
CONTROL
VOLTAGE
V
DD
10K
A
OPTIONAL
CAPACITOR
C
V
DD
R
FIGURE 2A. ASTABLE OPERATION
ICM7555, ICM7556
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ICM7556/D | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:General Purpose timers |
| ICM7556CAB | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| ICM7556CJD | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| ICM7556CPA | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| ICM7556CPD | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
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