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RS485

RS232 / EIA562 / RS485 Transceivers

Linear Technology 

LTC1321/LTC1322/LTC1335

DC ELECTRICAL CHARACTERISTICS

VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = – 5V ±5% (Notes 2, 3)

SYMBOL PARAMETER

RS485 Driver (SEL1 = SEL2 = HIGH)

VOD1

Differential Driver Output Voltage (Unloaded)

VOD2

Differential Driver Output Voltage (With Load)

∆VOD

VOC

∆VOC

IOSD

Change in Magnitude of Driver Differential

Output Voltage for Complementary Output States

Driver Common-Mode Output Voltage

Change in Magnitude of Driver Common-Mode

Output Voltage for Complementary Output States

Driver Short-Circuit Current

IOZD

Three-State Output Current (Y, Z)

EIA/TIA-562 Driver (SEL1 = SEL2 = LOW)

VO

Output Voltage Swing

IOSD

Output Short-Circuit Current

Driver Inputs and Control Inputs

VIH

Input High Voltage

VIL

Input Low Voltage

IIN

Input Current

RS485 Receiver (SEL1 = SEL2 = HIGH)

CONDITIONS

IO = 0

Figure 1, R = 50Ω (RS422)

Figure 1, R = 27Ω (RS485)

Figure 1, R = 27Ω or R = 50Ω

Figure 1, R = 27Ω or R = 50Ω

Figure 1, R = 27Ω or R = 50Ω

– 7V ≤ VO ≤ 12V, VO = HIGH

– 7V ≤ VO ≤ 12V, VO = LOW (Note 4)

– 7V ≤ VO ≤ 12V

Figure 4, RL = 3k, Positve

Figure 4, RL = 3k, Negative

VO = 0V

D, DE, ON/OFF, SEL1, SEL2, LB

OE (LTC1335)

D, DE, ON/OFF, SEL1, SEL2, LB

OE (LTC1335)

D, SEL1, SEL2

DE, ON/OFF, LB

OE (LTC1335)

MIN TYP MAX UNITS

q

q 2.0

q 1.5

q

5

V

5

V

5

V

0.2

V

q

3

V

q

0.2

V

q 35

q 10

250

mA

250

mA

q

±5 ±500

µA

q 3.7

4.2

V

q – 3.7 – 4.3

V

q

±11 ±60

mA

q2

V

q2

V

q

0.8

V

q

0.8

V

q

±10

µA

q

–4

– 15

µA

q

4

15

µA

VTH

Differential Input Threshold Voltage

∆VTH

Input Hysteresis

IIN

Input Current (A, B)

RIN

Input Resistance

EIA/TIA-562 Receiver (SEL1 = SEL2 = LOW)

VTH

Receiver Input Voltage Threshold

∆VTH

Receiver Input Hysteresis

RIN

Receiver Input Resistance

Receiver Output

VOH

Receiver Output High Voltage

VOL

Receiver Output Low Voltage

IOSR

Short-Circuit Current

IOZR

Three-State Output Current

– 7V ≤ VCM ≤ 7V, Commercial

– 7V ≤ VCM ≤ 7V, Industrial

VCM = 0V

– 7V ≤ VIN ≤ 12V

– 7V ≤ VIN ≤ 12V

q – 0.2

q – 0.3

0.2

V

0.3

V

q

70

mV

q

±1

mA

q 12

24

kΩ

Input Low Threshold

Input High Threshold

VIN = ±10V

q 0.8

1.1

V

q

1.7

2.4

V

q 0.1

0.6

1.0

V

3

5

7

kΩ

IO = – 3mA, VIN = 0V, SEL1 = SEL2 = LOW q 3.5

4.6

V

IO = 3mA, VIN = 3V, SEL1 = SEL2 = LOW q

0.2

0.4

V

0V ≤ VO ≤ VCC

q7

85

mA

ON/OFF = 0V

q

OE = VCC (LTC1335)

q

±10

µA

±10

µA

3

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