LTC1045_15 datasheet(7/20 Pages) LINER

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LTC1045

1045fc

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

100k

Ω, the input voltage can be driven to at least ±50V

with no adverse effects for any combination of allowed

APPLICATIONS INFORMATION

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.

V+ – VOH (V)

1045 F06

SPECIFIED POINT

VOH – VOL = 5V

VOH – VOL = 10V

VOH – VOL = 4V

VOH – VOL = 3V

VOH – VOL (V)

1045 F07

SPECIFIED POINT

Figure 6. Relative Output Sourcing

Resistance (ROH) vs V + – VOH

Figure 7. Relative Output Sinking

Resistance (ROL) vs VOH – VOL

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