SN95176B

DIFFERENTIAL BUS TRANSCEIVER

SGLS026A − MARCH 1989 − REVISED JUNE 1995

2−5

POST OFFICE BOX 655303

POST OFFICE BOX 1443

SYMBOL EQUIVALENTS

DATA SHEET PARAMETER

RS-422-A

RS-485

VO

Voa, Vob

Voa, Vob

|VOD1|

Vo

Vo

|VOD2|

Vt (RL = 100 Ω)

Vt (RL = 54 Ω)

|VOD3|

None

Vt (Test Termination

|VOD3|

None

Vt (Test Termination

Measurement 2)

∆|VOD|

| |Vt| − |Vt||

| |Vt − |Vt||

VOC

|Vos|

|Vos|

∆|VOC|

|Vos − Vos|

|Vos − Vos|

IOS

|Isa|, |Isb|

None

IO

|Ixa|, |Ixb|

Iia, Iib

RECEIVER SECTION

electrical characteristics over recommended ranges of common-mode input voltage, supply

voltage, and operating free-air temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIT +

Positive-going input threshold voltage

VO = 2.7 V,

IO = − 0.4 mA

0.2

V

VIT −

Negative-going input threshold voltage

VO = 0.5 V,

IO = 8 mA

− 0.2‡

V

Vhys

Input hysteresis voltage (VIT + − VIT −)

50

mV

VIK

Enable clamp voltage

II = − 18 mA

− 1.5

V

VOH

High-level output voltage

VID = 200 mV,

IOH = − 400 µA,

2.7

V

VOH

High-level output voltage

VID = 200 mV,

See Figure 2

IOH = − 400 µA,

2.7

V

VOL

Low-level output voltage

VID = − 200 mV,

IOL = 8 mA,

0.45

V

VOL

Low-level output voltage

VID = − 200 mV,

See Figure 2

IOL = 8 mA,

0.45

V

IOZ

High-impedance-state output current

VO = 0.4 V to 2.4 V

±20

µA

II

Line input current

Other input = 0 V,

VI = 12 V

1

mA

II

Line input current

Other input = 0 V,

See Note 5

VI = − 7 V

− 0.8

mA

IIH

High-level enable input current

VIH = 2.7 V

20

µA

IIL

Low-level enable input current

VIL = 0.4 V

− 100

µA

ri

Input resistance

VI = 12 V

12

k

Ω

IOS

Short-circuit output current

−15

−85

mA

ICC

Supply current (total package)

No load

Outputs enabled

42

70

mA

ICC

Supply current (total package)

No load

Outputs disabled

26

35

mA

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

‡ The algebraic convention, in which the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode

input voltage and threshold voltage levels only.

NOTE 5: This applies for both power on and power off. Refer to EIA Standard RS-485 for exact conditions.