LTC485CJ8 Ver la hoja de datos (PDF) - Linear Technology

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LTC485CJ8

Low Power RS485 Interface Transceiver

Linear Technology 

LTC485

ABSOLUTE AXI U RATI GS

(Note 1)

Supply Voltage ....................................................... 12V

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

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

Driver Output Voltage ........................................... ±14V

Receiver Input Voltage .......................................... ±14V

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

Operating Temperature Range

LTC485I ...................................... – 40°C ≤ TA ≤ 85°C

LTC485C ......................................... 0°C ≤ TA ≤ 70°C

LTC485M (OBSOLETE) .......... – 55°C ≤ TA ≤ 125°C

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

PACKAGE/ORDER I FOR ATIO

TOP VIEW

RO 1

RE 2

R

8 VCC

7B

DE 3

DI 4

D

6A

5 GND

N8 PACKAGE

S8 PACKAGE

8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC

TJMAX = 125°C, θJA = 100°C/ W (N)

TJMAX = 150°C, θJA = 150°C/ W (S)

ORDER PART

NUMBER

LTC485CN8

LTC485CS8

LTC485IN8

LTC485IS8

S8 PART MARKING

485

485I

J8 PACKAGE

8-LEAD CERAMIC DIP

TJMAX = 155°C, θJA = 100°C/ W (J)

ORDER PART

NUMBER

LTC485CJ8

LTC485MJ8

OBSOLETE PACKAGE

Consider the N8 Package for Alternate Source

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

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5%, unless otherwise noted. (Notes 2 and 3)

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

VOD1

Differential Driver Output Voltage (Unloaded) IO = 0

●

5

VOD2

Differential Driver Output Voltage (with Load) R = 50Ω (RS422)

●2

R = 27Ω (RS485), Figure 1

● 1.5

5

∆VOD

Change in Magnitude of Driver Differential

R = 27Ω or R = 50Ω, Figure 1

●

0.2

Output Voltage for Complementary States

VOC

Driver Common Mode Output Voltage

R = 27Ω or R = 50Ω, Figure 1

●

3

∆⏐VOC⏐ Change in Magnitude of Driver Common-Mode R = 27Ω or R = 50Ω, Figure 1

●

0.2

Output Voltage for Complementary States

VIH

Input High Voltage

DE, DI, RE

●2

VIL

Input Low Voltage

DE, DI, RE

●

0.8

IIN1

Input Current

DE, DI, RE

●

±2

IIN2

Input Current (A, B)

DE = 0, VCC = 0V VIN = 12V

●

±1

or 5.25V

VIN = – 7V

●

– 0.8

VTH

Differential Input Threshold Voltage

for Receiver

– 7V ≤ VCM ≤ 12V

● – 0.2

0.2

∆VTH

Receiver Input Hysteresis

VOH

Receiver Output High Voltage

VOL

Receiver Output Low Voltage

IOZR

Three-State (High Impedance) Output

Current at Receiver

VCM = 0V

IO = – 4mA, VID = 200mV

IO = 4mA, VID = – 200mV

VCC = Max, 0.4V ≤ VO ≤ 2.4V

●

70

● 3.5

●

0.4

●

±1

RIN

Receiver Input Resistance

– 7V ≤ VCM ≤ 12V

● 12

UNITS

V

V

V

V

V

V

V

V

µA

mA

mA

V

mV

V

V

µA

kΩ

2

sn485 LTC485ffs

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