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參數(shù)資料
| 型號： | LMC6772AIN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output |
| 中文描述： | DUAL COMPARATOR, 15000 uV OFFSET-MAX, 4000 ns RESPONSE TIME, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 288K |
| 代理商： | LMC6772AIN |
1.0 Input Common-Mode Voltage
Range
(Continued)
LMC6772 can compare the sensor signal with an appropri-
ately small reference voltage. This reference voltage can be
close to ground or the positive supply rail.
2.0 Low Voltage Operation
Comparators are the common devices by which analog sig-
nals interface with digital circuits. The LMC6772 has been
designed to operate at supply voltages of 2.7V, without sac-
rificing performance, to meet the demands of 3V digital sys-
tems.
At supply voltages of 2.7V, the common-mode voltage range
extends 200 mV (guaranteed) below the negative supply.
This feature, in addition to the comparator being able to
sense signals near the positive rail, is extremely useful in low
voltage applications.
At V
+
= 2.7V, propagation delays are t
= 4 μs and t
=
4 μs with overdrives of 100 mV. Please refer to the perfor-
mance curves for more extensive characterization.
3.0 Output Short Circuit Current
The LMC6772 has short circuit protection of 40 mA. How-
ever, it is not designed to withstand continuous short circuits,
transient voltage or current spikes, or shorts to any voltage
beyond the supplies. A resistor is series with the output
should reduce the effect of shorts. For outputs which send
signals off PC boards additional protection devices, such as
diodes to the supply rails, and varistors may be used.
4.0 Hysteresis
If the input signal is very noisy, the comparator output might
trip several times as the input signal repeatedly passes
through the threshold. This problem can be addressed by
making use of hysteresis as shown below.
The capacitor added across the feedback resistor increases
the switching speed and provides more short term hyster-
esis. This can result in greater noise immunity for the circuit.
5.0 Spice Macromodel
A Spice Macromodel is available for the LMC6772. The
model includes a simulation of:
Input common-mode voltage range
Quiescent and dynamic supply current
Input overdrive characteristics
and many more characteristics as listed on the macromodel
disk.
Contact the National Semiconductor Customer Response
Center at 1-800-272-9959 to obtain an operational amplifier
spice model library disk.
Typical Applications
Universal Logic Level Shifter
The output of the LMC6772 is the uncommitted drain of the
output NMOS transistor. Many drains can be tied together to
provide an output OR’ing function. An output pullup resistor
can be connected to any available power supply voltage
within the permitted power supply range.
The two 1 k
resistors bias the input to half of the power
supply voltage. The pull-up resistor should go to the output
logic supply. Due to its wide operating range, the LMC6772
is ideal for the logic level shifting applications.
DS012347-25
FIGURE 2. Even at Low-Supply Voltage of 2.7V, an
Input Signal which Exceeds the Supply Voltages
Produces No Phase Inversion at the Output
DS012347-26
FIGURE 3. Canceling the Effect of Input Capacitance
DS012347-27
FIGURE 4. Universal Logic Level Shifter
www.national.com
7
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| LMC6772BIMX | 功能描述:校驗器 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| LMC6772BIMX/NOPB | 功能描述:校驗器 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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