Table 9. Driver: over recommended operating conditions (unless otherwise specified. Please, see

"Operating conditions" table)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

DC driver/ DC

II

Driver input, driver enable,

and receiver enable input

current

-2

2

µA

|VOD|

Driver differential output

voltage magnitude

RL = 60 Ω, 375 Ω on

each output to –7 V to

12

1.5

2

V

RL = 54 Ω (RS-485)

1.5

2

RL = 100 Ω (RS-422)

TJ ≥ 0 °C, VCC ≥ 3.2

2

Δ|VOD|

Change in magnitude of

driver differential output

voltage

RL = 54 Ω, CL = 50 pF

-50

0

50

mV

V°C(SS)

Steady-state common-

mode output voltage

Center of two 27-Ω

load resistors

1

VCC/2

3

V

ΔV°C

Change in differential

driver output common-

mode voltage

-50

0

50

mV

V°C(PP)

Peak-to-peak driver

common-mode output

voltage

500

Driver/switching characteristics, SLR='1', 250 kps, bit time ≥ 4 µs

tr, tf

Driver differential output

rise/fall time

RL=54 Ω, CL=50 pF

0.05

0.2

1

tPHL, tPLH

Driver propagation delay

time

0.4

1

1.5

tSK(P)

Driver pulse skew, |tPHL –

tPLH|

0.3

tPLZ, tPHZ

Driver disable time

0.017

0.035

tPLZ, tPZH

Driver enable time

Receiver enabled

CL=50 pF with 110 kΩ

0.7

1.2

Receiver disabled

CL=50 pF with 110 kΩ

1.64

2.4

µs

Driver/switching characteristics, SLR= '0', 20 Mbps, bit time ≥ 50 ns

tr, tf

Driver differential output

rise/fall time

RL=54 Ω, CL=50 pF

4

7

15

ns

tPHL, tPLH

Driver propagation delay

6

12

25

tSK(P)

Driver pulse skew, |tPHL –

tPLH|

4

tPLZ, tPHZ

Driver disable time

17

40

tPZL, tPZH

Driver enable time

Receiver enabled

9

18

Receiver disabled

1

2.4

µs

STR485

Electrical characteristics

DS12713 - Rev 1

page 9/24