MC75172B MC75174B

11

MOTOROLA ANALOG IC DEVICE DATA

Comparing System Requirements

Characteristic

Symbol

EIA–485

EIA–422–A

V.11 and X.27

GENERATOR (DRIVER)

Output Impedance (Note 1)

Zout

Not Specified

t100 Ω

50 10 100

Ω

Open Circuit Voltage

Differential

Single–Ended

VOCD

VOCS

1.5 to 6.0 V

t6.0 V

p6.0 V

p6.0 V

p6.0 V, w/3.9 kΩ, Load

p6.0 V, w/3.9 kΩ, Load

Loaded Differential Voltage

VOD

1.5 to 5.0 V, w/54

Ω load

q2.0 V or q 0.5

VOCD, w/100 Ω load

q2.0 V or q 0.5 VOCD,

w/100

Ω load

Differential Voltage Balance

∆VOD

t200 mV

p400 mV

t400 mV

Output Common Mode Range

VCM

–7.0 to +12 V

Not Specified

Not Specified

Offset Voltage

VOS

–1.0

t VOS t 3.0 V

p3.0 V

p3.0 V

Offset Voltage Balance

∆VOS

t200 mV

p400 mV

t400 mV

Short Circuit Current

IOS

p250 mA for –7.0 to

12 V

p150 mA to ground

p150 mA to ground

Leakage Current (VCC = 0)

IOLK

Not Specified

p100 µA to –0.25 V

thru 6.0 V

p100 µA to ± 0.25 V

Output Rise/Fall Time (Note 2)

tr, tf

p0.3 TB, w/54 Ω/1150 pF

load

p0.1 TB or p 20 ns,

w/100

Ω load

p0.1 TB or p 20 ns,

w/100

Ω load

RECEIVER

Input Sensitivity

Vth

± 200 mV

± 200 mV

± 300 mV

Input Bias Voltage

Vbias

p3.0 V

p3.0 V

p3.0 V

Input Common Mode Range

Vcm

–7.0 to 12 V

–7.0 to 7.0 V

–7.0 to 7.0 V

Dynamic Input Impedance

Rin

Spec number of U.L.

q4 kΩ

q4 kΩ

NOTES: 1. Compliance with V.11 and X.27 (Blue book) output impedance requires external resistors in series with the outputs of the MC75172B and MC75174B.

2. TB = Bit time.

Additional Information

Copies of the EIA Recommendations (EIA–485 and EIA–422–A) can be obtained from the Electronics Industries Association,

Washington, D.C. (202–457–4966). Copies of the CCITT Recommendations (V.11 and X.27) can be obtained from the United

States Department of Commerce, Springfield, VA (703–487–4600).