LTC491IS#TRPBF【PDF 5/12 页】IC TXRX RS485 LOW POWER 14-SOIC

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Sheet目录2007

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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

; (RS422)

R = 27

; (RS485) (Figure 1)

1.5

VOD

Change in Magnitude of Driver Differential Output

R = 27

or R = 50 (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

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

ICC

Supply Current

No Load; D = GND,

Outputs Enabled

300

500

or VCC

Outputs Disabled

300

500

RIN

Receiver Input Resistance

– 7V

≤VCM ≤12V

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

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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