LTC487 datasheet(2/8 Pages) LINER

Part #	LTC487

Description	Quad Low Power RS485 Driver

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC487

2

ELECTRICAL C

C

HARA TERISTICS

C

D

A

G

A

U

A

R

BSOLUTEXI

TI

S

PACKAGE/ORDER I FOR ATIO

(Note 1)

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

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

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

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

±14V

Control Input Currents ........................................

±25mA

Driver Input Currents ..........................................

±25mA

Operating Temperature Range

Commercial ............................................ 0

°C to 70°C

Industrial ........................................... – 40

°C to 85°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

DI1

DO1A

DO1B

EN12

DO2B

DO2A

DI2

GND

DI3

DO3A

DO3B

EN34

DO4B

DO4A

DI4

V

N PACKAGE

16-LEAD PLASTIC DIP

TOP VIEW

CC

S PACKAGE

16-LEAD PLASTIC SOL

TJMAX = 125°C, θJA = 70°C/W (N)

TJMAX = 150°C, θJA = 95°C/W (S)

LTC487CN

LTC487CSW

LTC487IN

LTC487ISW

pins are negative. All voltages are referenced to device GND unless

otherwise specified.

Note 3: All typicals are given for VCC = 5V and Temperature = 25°C.

Note 1: Absolute maximum ratings are those beyond which the safety of

the device cannot be guaranteed.

Note 2: All currents into device pins are positive; all currents out of device

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tPLH

Driver Input to Output

RDIFF = 54Ω, CL1 = CL2 = 100pF

10

30

50

ns

tPHL

Driver Input to Output

(Figures 1, 4)

10

30

50

ns

tSKEW

Driver Output to Output

515

ns

tr, tf

Driver Rise or Fall Time

5

20

25

ns

tZH

Driver Enable to Output High

CL = 100pF (Figures 2, 5) S2 Closed

35

70

ns

tZL

Driver Enable to Output Low

CL = 100pF (Figures 2, 5) S1 Closed

35

70

ns

tLZ

Driver Disable Time from Low

CL = 15pF (Figures 2, 5) S1 Closed

35

70

ns

tHZ

Driver Disable Time from High

CL = 15pF (Figures 2, 5) S2 Closed

35

70

ns

VCC = 5V ± 5%, 0°C ≤ TA ≤ 70°C (Note 2, 3)

S

GC

C

HARA TERISTICS

WITCHI

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOD1

Differential Driver Output Voltage (Unloaded)

IO = 0

5

V

VOD2

Differential Driver Output Voltage (With Load)

R = 50

Ω; (RS422)

2

V

R = 27

Ω; (RS485) (Figure 3)

1.5

5

V

VOD

Change in Magnitude of Driver Differential

R = 27

Ω or R = 50Ω

0.2

V

Output Voltage for Complementary Output States

(Figure 3)

VOC

Driver Common-Mode Output Voltage

3V

⏐VOC⏐

Change in Magnitude of Driver Common-Mode

0.2

V

Output Voltage for Complementary Output States

VIH

Input High Voltage

DI, EN12, EN34

2.0

V

VIL

Input Low Voltage

0.8

V

IIN1

Input Current

±2

µA

ICC

Supply Current

No Load

Output Enabled

110

200

µA

Output Disabled

110

200

µA

IOSD1

Driver Short-Circuit Current, VOUT = High

VO = – 7V

100

250

mA

IOSD2

Driver Short-Circuit Current, VOUT = Low

VO = 12V

100

250

mA

IOZ

High Impedance State Output Current

VO = – 7V to 12V

±10

± 200

µA

VCC = 5V ± 5%, 0°C ≤ TA ≤ 70°C (Commercial), – 40°C ≤ TA ≤ 85°C (Industrial) (Note 2, 3)

Consult factory for Military grade parts.

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