LTC2802 datasheet(4/32 Pages) AD

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LTC2873

REV B

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SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOH

Receiver Output High Voltage

Output High, I(RO) = –3mA (Sourcing),

3V ≤ VL ≤ 5.5V

VL – 0.4

Output High, I(RO) = –1mA (Sourcing),

1.7V ≤ VL < 3V

VL – 0.4

Three-State (High Impedance) Output Current (RO) 0V ≤ RO ≤ VL, VL = 5.5V, RE485 = VL

±5

µA

Short-Circuit Current (RO)

0V ≤ RO ≤ VL, VL = 5.5V

±135

RTERM

Terminating Resistor

TE485 = 0V, VAB = 2V,

VB = –7V, 0V, 10V (Figure 8)

108

120

156

RS232 Driver

VOLD

Output Low Voltage

RL = 3kΩ, VEE ≤ –6V

–5

–5.5

VEE

VOHD

Output High Voltage

RL = 3kΩ, VDD ≥ 6.5V

5.9

VDD

Output Short-Circuit Current

Driver Output = 0V

±25

±90

RS232 Receiver

Input Threshold Voltage

0.6

1.5

2.5

Input Hysteresis

0.1

0.4

1.0

Output Low Voltage

I(RO) = 1mA (Sinking), 1.7V ≤ VL < 5.5V

0.4

Output High Voltage

I(RO) = –1mA (Sourcing), 1.7V ≤ VL < 5.5V

VL – 0.4

Input Resistance

–15V ≤ B/RI ≤ 15V, 485/232 = 0V

kΩ

Output Short-Circuit Current

VL = 5.5V, 0V ≤ RO ≤ VL

±25

±50

Logic Inputs

Threshold Voltage

0.4

0.75 • VL

Input Current

±5

µA

ESD

Interface Pins (A/DO, B/RI)

Human Body Model to GND or VCC, Powered

or Unpowered (Note 5)

±26

All Other Pins

Human Body Model (Note 5)

±4

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = VL, LB = 0V unless otherwise noted. (Notes 2, 6)

ELECTRICAL CHARACTERISTICS

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