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LM2903PWLE 数据表(PDF) 11 Page - Texas Instruments

部件名 LM2903PWLE
功能描述  Dual Differential Comparators
Download  25 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2903PWLE 数据表(HTML) 11 Page - Texas Instruments

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±1
0
1
2
3
4
5
6
-0.25
0.25
0.75
1.25
1.75
2.25
Time (usec)
5mV OD
20mV OD
100mV OD
C004
±1
0
1
2
3
4
5
6
±0.25 0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
Time (usec)
5mV OD
20mV OD
100mV OD
C006
LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V
www.ti.com
SLCS005Y – OCTOBER 1979 – REVISED JUNE 2015
1. When both IN- and IN+ are both within the common-mode range:
(a) If IN- is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking
current
(b) If IN- is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is
not conducting
2. When IN- is higher than common-mode and IN+ is within common-mode, the output is low and the output
transistor is sinking current
3. When IN+ is higher than common-mode and IN- is within common-mode, the output is high impedance and
the output transistor is not conducting
4. When IN- and IN+ are both higher than common-mode, the output is low and the output transistor is sinking
current
8.2.2.2 Minimum Overdrive Voltage
Overdrive Voltage is the differential voltage produced between the positive and negative inputs of the comparator
over the offset voltage (VIO). In order to make an accurate comparison the Overdrive Voltage (VOD) should be
higher than the input offset voltage (VIO). Overdrive voltage can also determine the response time of the
comparator, with the response time decreasing with increasing overdrive. Figure 8 and Figure 9 show positive
and negative response times with respect to overdrive voltage.
8.2.2.3 Output and Drive Current
Output current is determined by the load/pull-up resistance and logic/pullup voltage. The output current will
produce a output low voltage (VOL) from the comparator. In which VOL is proportional to the output current. Use
Typical Characteristics to determine VOL based on the output current.
The output current can also effect the transient response. See Response Time for more information.
8.2.2.4 Response Time
The transient response can be determined by the load capacitance (CL), load/pullup resistance (RPULLUP) and
equivalent collector-emitter resistance (RCE).
The positive response time (
τp) is approximately τP ~ RPULLUP × CL
The negative response time (
τN) is approximately τN ~ RCE × CL
RCE can be determine by taking the slope of Typical Characteristics in it's linear region at the desired
temperature, or by dividing the VOL by Iout
8.2.3 Application Curves
The following curves were generated with 5 V on VCC and VLogic, RPULLUP = 5.1 kΩ, and 50 pF scope probe.
Figure 8. Response Time for Various Overdrives
Figure 9. Response Time for Various Overdrives
(Positive Transition)
(Negative Transition)
Copyright © 1979–2015, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V


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