LT1781IS 查看數據表（PDF） - Linear Technology

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LT1781IS

Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection

Linear Technology 

LT1780/LT1781

ELECTRICAL CHARACTERISTICS (Note 2)

PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

Logic Input Current

Output Short-Circuit Current

Output Leakage Current

Data Rate

Slew Rate

Propagation Delay

Receiver

0.8V ≤ VIN ≤ 2.0V

VOUT = 0V

SHUTDOWN VOUT = ±30V (Note 4)

RL = 3k, CL = 2500pF

RL = 3k, CL = 1000pF

RL = 3k, CL = 51pF

RL = 3k, CL = 2500pF

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

Output Transition tLH Low-to-High

q

5

20

±7

17

q

10

100

120

250

15

30

4

7

0.6

1.3

0.5

1.3

µA

mA

µA

kBaud

kBaud

V/µs

V/µs

µs

µs

Input Voltage Thresholds

Hysteresis

Input Low Threshold (VOUT = High)

Input High Threshold (VOUT = Low)

0.8

1.3

V

1.7

2.4

V

q 0.1

0.4

1

V

Input Resistance

Output Leakage Current

Output Voltage

Output Short-Circuit Current

Propagation Delay

VIN = ±10V

SHUTDOWN (Note 4) 0 ≤ VOUT ≤ VCC

Output Low, IOUT = – 1.6mA

Output High, IOUT = 160µA (VCC = 5V)

Sinking Current, VOUT = VCC

Sourcing Current, VOUT = 0V

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

Output Transition tLH Low-to-High

3

5

7

kΩ

q

1

10

µA

q

0.2

0.4

V

q 3.5

4.2

V

– 20

– 10

mA

10

20

mA

250 600

ns

350 600

ns

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 = 0.1µF. All outputs are open, with all

driver inputs tied high.

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).

3

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