ADM485

Rev. F | Page 3 of 16

SPECIFICATIONS

VCC = 5 V ± 5%, all specifications TMIN to TMAX, unless otherwise noted.

Table 1.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

DRIVER

Differential Output Voltage, VOD

5.0

V

R = ∞, see Figure 20

2.0

5.0

V

VCC = 5 V, R = 50 Ω (RS-422), see Figure 20

1.5

5.0

V

R = 27 Ω (RS-485), see Figure 20

VOD3

1.5

5.0

V

VTST = −7 V to +12 V, see Figure 21

Δ|VOD| for Complementary Output States

0.2

V

R = 27 Ω or 50 Ω, see Figure 20

Common-Mode Output Voltage, VOC

3

V

R = 27 Ω or 50 Ω, see Figure 20

Δ|VOD| for Complementary Output States

0.2

V

R = 27 Ω or 50 Ω

Output Short-Circuit Current, VOUT = High

35

250

mA

−7 V ≤ VO ≤ +12 V

Output Short-Circuit Current, VOUT = Low

35

250

mA

−7 V ≤ VO ≤ +12 V

CMOS Input Logic Threshold Low, VINL

0.8

V

CMOS Input Logic Threshold High, VINH

2.0

V

Logic Input Current (DE, DI)

±1.0

μA

RECEIVER

Differential Input Threshold Voltage, VTH

−0.2

+0.2

V

−7 V ≤ VCM ≤ +12 V

Input Voltage Hysteresis, ΔVTH

70

mV

VCM = 0 V

Input Resistance

12

kΩ

−7 V ≤ VCM ≤ +12 V

Input Current (A, B)

1

mA

VIN = 12 V

–0.8

mA

VIN = −7 V

CMOS Input Logic Threshold Low, VINL

0.8

V

CMOS Input Logic Threshold High, VINH

2.0

V

Logic Enable Input Current (RE)

±1

μA

CMOS Output Voltage Low, VOL

0.4

V

IOUT = 4.0 mA

CMOS Output Voltage High, VOH

4.0

V

IOUT = −4.0 mA

Short-Circuit Output Current

7

85

mA

VOUT = GND or VCC

Three-State Output Leakage Current

±1.0

μA

0.4 V ≤ VOUT ≤ 2.4 V

POWER SUPPLY CURRENT

ICC, Outputs Enabled

1.0

2.2

mA

Digital inputs = GND or VCC

ICC, Outputs Disabled

0.6

1

mA

Digital inputs = GND or VCC