4

Electrical characteristics

VCC = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C).

Table 4. Electrical characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

ISUPPLY VCC power supply current

No Load,

DI = 0 V or VCC

DE = VCC, RE = 0 V or VCC

1.3

2.2

mA

DE=0 V, RE=0 V

1.2

1.9

mA

ISHDN

Shutdown supply current

DE = 0 V, RE = VCC, DI = 0 V or VCC

0.002

1

µA

Table 5. Logic input electrical characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VIL

Input logic threshold low

DE, DI, RE

0.8

V

VIH

Input logic threshold high

DE, DI, RE

2

V

IIN1

Logic input current

DE, DI, RE

±2.0

µA

IIN2

Input current (A, B)

DE=0 V, VCC=0 or 3.6 V

VIN = 12 V

1

mA

VIN = -7 V

-0.8

mA

Table 6. Transmitter electrical characteristics

Symbol

Parameter

Test conditions

Min. Typ. Max. Unit

VOD

Differential drive output

RL= 100 Ω (RS-422) (Figure 1. Pin

connections)

2

V

RL= 54 Ω (RS-485) (Figure 1. Pin connections) 1.5

V

RL= 60 Ω (RS-485) (Figure 2. Driver and VOC

test load)

1.5

V

ΔVOD

Change in magnitude of driver differential

output voltage for complementary output

states (1)

RL= 54 Ω or 100 Ω (Figure 1. Pin connections)

0.2

V

VOC

Driver common mode output voltage

RL= 54 Ω or 100 Ω (Figure 1. Pin connections)

3

V

ΔVOC

Change in magnitude of driver common

mode output voltage(1)

RL= 54 Ω or 100 Ω (Figure 1. Pin connections)

0.2

V

IOSD

Driver short-circuit output current

±250 mA

1. ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.

ST1480US

Electrical characteristics

DS13697 - Rev 1

page 5/21