LT1780ISW datasheet(3/12 Pages) LINEAR

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LT1780/LT1781

ELECTRICAL C

HARA TERISTICS (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Logic Input Current

0.8V

≤ VIN ≤ 2.0V

520

µA

Output Short-Circuit Current

VOUT = 0V

±717

Output Leakage Current

SHUTDOWN VOUT = ±30V (Note 4)

100

µA

Data Rate

RL = 3k, CL = 2500pF

120

kBaud

RL = 3k, CL = 1000pF

250

kBaud

Slew Rate

RL = 3k, CL = 51pF

µs

RL = 3k, CL = 2500pF

µs

Propagation Delay

Output Transition tHL High-to-Low (Note 5)

0.6

1.3

µs

Output Transition tLH Low-to-High

0.5

1.3

µs

Receiver

Input Voltage Thresholds

Input Low Threshold (VOUT = High)

0.8

1.3

Input High Threshold (VOUT = Low)

1.7

2.4

Hysteresis

0.1

0.4

Input Resistance

VIN = ±10V

357

Ω

Output Leakage Current

SHUTDOWN (Note 4) 0

≤ VOUT ≤ VCC

110

µA

Output Voltage

Output Low, IOUT = – 1.6mA

0.2

0.4

Output High, IOUT = 160µA (VCC = 5V)

3.5

4.2

Output Short-Circuit Current

Sinking Current, VOUT = VCC

–10

Sourcing Current, VOUT = 0V

Propagation Delay

Output Transition tHL High-to-Low (Note 6)

250

600

Output Transition tLH Low-to-High

350

600

Note 4: Supply current measurements in SHUTDOWN are performed with

VON/OFF ≤ 0.1V.

Note 5: For driver delay measurements, RL = 3k and CL = 51pF. Trigger

points are set between the driver’s input logic threshold and the output

transition to the zero crossing (tHL = 1.4V to 0V and tLH = 1.4V to 0V).

Note 6: For receiver delay measurements, CL = 51pF. Trigger points are

set between the receiver’s input logic threshold and the output transition

to standard TTL/CMOS logic threshold (tHL = 1.3V to 2.4V and tLH = 1.7V

to 0.8V).

The q denotes specifications which apply over the operating temperature

range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: Testing done at VCC = 5V and VON/OFF = 3V, unless otherwise

specified.

Note 3: Supply current is measured as the average over several charge

pump cycles. C + = C – = C1 = C2 = 0.1

µF. All outputs are open, with all

driver inputs tied high.

–20

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