LTC1045(Rev_B) 查看數據表（PDF） - Linear Technology
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LTC1045 Datasheet PDF : 20 Pages
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LTC1045
APPLICATIONS INFORMATION
Because of this diode, VOH must not be greater than V +.
Lastly, the maximum voltage between any two power
supply pins must not exceed 15V operating or 18V abso-
lute maximum. For example, if V + = 5V, V – or VOL should
be no more negative than – 10V. Note that VOL should not
be more negative than – 10V even if the VOH to VOL
differential does not exceed the 15V maximum. In this
case the V + to VOL differential sets the limit.
Input Voltage
The LTC1045 has no upper clamp diodes as do conven-
tional CMOS circuits. This allows the inputs to exceed the
V + supply. The inputs will break down approximately 30V
above the V – supply. If the input current is limited with
100kΩ, the input voltage can be driven to at least ±50V
with no adverse effects for any combination of allowed
power supply voltages. Output levels will be correct even
under these conditions (i.e., if the input voltage is above
the trip point, the output will be high and if it is below, the
output will be low).
Output Drive
Output drive characteristics of the LTC1045 will vary with
the power supply voltages that are chosen. Output imped-
ance is affected by V +, VOH and VOL. V – has no effect on
output impedance. Guaranteed drive characteristics are
specified in the table of electrical characteristics for
V + = VOH = 5V and V – = VOL = 0V. Figures 6 and 7 show
relative output impedance for other supply combinations.
In general, output impedance is minimized if V + to VOH is
minimized and VOH to VOL is maximized.
4
VOH – VOL = 3V
3
2
VOH – VOL = 4V
VOH – VOL = 5V
1
SPECIFIED POINT
VOH – VOL = 10V
0
0 2 4 6 8 10
V+ – VOH (V)
12 14 16
1045 F06
Figure 6. Relative Output Sourcing
Resistance (ROH) vs V + – VOH
2
SPECIFIED POINT
1
0
0 2 4 6 8 10 12 14 16
VOH – VOL (V)
1045 F07
Figure 7. Relative Output Sinking
Resistance (ROL) vs VOH – VOL
7
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