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LTC491

491fa

BSOLUTEXI

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

LTC491CN

LTC491CS

LTC491IN

LTC491IS

(Note 1)

Supply Voltage (VCC) ............................................... 12V

Control Input Voltages .................... –0.5V to VCC + 0.5V

Control Input Currents .......................... –50mA to 50mA

Driver Input Voltages ...................... –0.5V to VCC + 0.5V

Driver Input Currents ............................ –25mA to 25mA

Driver Output Voltages ..........................................

±14V

Receiver Input Voltages .........................................

±14V

Receiver Output Voltages ............... –0.5V to VCC + 0.5V

Operating Temperature Range

LTC491C ................................................. 0

°C to 70°C

LTC491I .............................................. – 40

°C to 85°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5%

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOD1

Differential Driver Output Voltage (Unloaded)

IO = 0

VOD2

Differential Driver Output Voltage (With load)

R = 50

Ω; (RS422)

R = 27

Ω; (RS485) (Figure 1)

1.5

∆VOD

Change in Magnitude of Driver Differential Output

R = 27

Ω or R = 50Ω (Figure 1)

0.2

Voltage for Complementary Output States

VOC

Driver Common Mode Output Voltage

∆ VOC

Change in Magnitude of Driver Common Mode

0.2

Output Voltage for Complementary Output States

VIH

Input High Voltage

D, DE, REB

2.0

VIL

Input Low Voltage

0.8

lIN1

Input Current

±2

µA

lIN2

Input Current (A, B)

VCC = 0V or 5.25V

VIN = 12V

1.0

VIN = –7V

– 0.8

VTH

Differential Input Threshold Voltage for Receiver

– 7V

≤VCM ≤12V

– 0.2

0.2

∆VTH

Receiver Input Hysteresis

VCM = 0V

VOH

Receiver Output High Voltage

IO = –4mA, VID = 0.2V

3.5

VOL

Receiver Output Low Voltage

IO = 4mA, VID = –0.2V

0.4

IOZR

Three-State Output Current at Receiver

VCC = Max 0.4V ≤ VO ≤ 2.4V

±1

µA

ICC

Supply Current

No Load; D = GND,

Outputs Enabled

300

500

µA

or VCC

Outputs Disabled

300

500

µA

RIN

Receiver Input Resistance

– 7V

≤VCM ≤12V

Ω

IOSD1

Driver Short Circuit Current, VOUT = High

VO = –7V

100

250

IOSD2

Driver Short Circuit Current, VOUT = Low

VO = 12V

100

250

IOSR

Receiver Short Circuit Current

≤VO ≤VCC

785

IOZ

Driver Three-State Output Current

VO = – 7V to 12V

±2

±200

µA

TOP VIEW

S PACKAGE

14-LEAD PLASTIC SO

N PACKAGE

14-LEAD PDIP

VCC

GND

REB

TJMAX = 100°C, θJA = 90°C/W (N)

TJMAX = 100°C, θJA = 110°C/W (S)

Consult LTC Marketing for parts specified with wider operating temperature ranges.

DC ELECTRICAL CHARACTERISTICS

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