SN65LBC174A, SN75LBC174A

QUADRUPLE RS485 DIFFERENTIAL LINE DRIVERS

SLLS446C − OCTOBER 2000 − REVISED MAY 2003

4

POST OFFICE BOX 655303

recommended operating conditions

MIN

NOM

MAX

UNIT

Supply voltage, VCC

4.75

5

5.25

V

Voltage at any bus terminal

Y, Z

−7

12

V

High-level input voltage, VIH

A, EN

2

VCC

V

Low-level input voltage, VIL

A, EN

0

0.8

V

Output current

−60

60

mA

Operating free-air temperature, TA

SN75LBC174A

0

70

°C

Operating free-air temperature, TA

SN65LBC174A

−40

85

°C

electrical characteristics over recommended operating conditions

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

Input clamp voltage

II = −18 mA

−1.5

−0.77

V

VO

Open-circuit output voltage

Y or Z,

No load

0

VCC

V

Steady-state differential output

No load (open circuit)

3

VCC

VOD(SS)

Steady-state differential output

voltage magnitude‡

RL = 54 Ω, See Figure 1

1

1.6

2.5

V

VOD(SS)

voltage magnitude‡

With common-mode loading, See Figure 2

1

1.6

2.5

V

∆VOD(SS)

Change in steady-state differential

output voltage between logic

states

See Figure 1

−0.1

0.1

V

VOC(SS)

Steady-state common-mode

output voltage

See Figure 3

2

2.4

2.8

V

∆VOC(SS)

Change in steady-state

common-mode output voltage

between logic states

See Figure 3

−0.02

0.02

V

II

Input current

A, G, G

−50

50

µA

IOS

Short-circuit output current

VI = 0 V

−200

200

mA

IOS

Short-circuit output current

VI = VCC

−200

200

mA

IOZ

High-impedance-state output

current

VTEST = −7 V to 12 V,

See Figure 7

EN at 0 V

−50

50

µA

IO(OFF)

Output current with power off

See Figure 7

VCC = 0 V

−10

10

µA

ICC

Supply current

VI = 0 V or VCC,

All drivers enabled

23

mA

ICC

Supply current

VI = 0 V or VCC,

No load

All drivers disabled

1.5

mA

† All typical values are at VCC = 5 V and 25°C.

‡ The minimum VOD may not fully comply with TIA/EIA-485-A at operating temperatures below 0°C. System designers should take the possibly

of lower output signal into account in determining the maximum signal transmission distance.