SN888C

SLLSEI4 – SEPTEMBER 2013

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RECOMMENDED OPERATING CONDITIONS

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

VID

Differential input voltage

–12

12

VI

Input voltage at any bus terminal (separate or common mode)(1)

–7

12

V

VIH

High-level input voltage (driver, driver-enable, and receiver-enable inputs)

2

VCC

VIL

Low-level input voltage (driver, driver-enable, and receiver-enable inputs)

0

0.8

Driver

–60

60

IO

Output current

mA

Receiver

–8

8

CL

Differential load capacitance

50

pF

RL

Differential load resistance

60

Ω

1/tUI

Signaling rate

0.3

250

kbps

TJ

Junction temperature

–40

150

°C

TA

(2)

Operating free-air temperature (see THERMAL INFORMATION for additional

–40

85

information)

(1)

The algebraic convention in which the least positive (most negative) limit is designated as minimum is used in this data sheet.

(2)

Operation is specified for internal (junction) temperatures up to 150°C. Self-heating due to internal power dissipation should be

considered for each application. Maximum junction temperature is internally limited by the thermal shut-down (TSD) circuit which

disables the driver outputs when the junction temperature reaches 170°C.

ELECTRICAL CHARACTERISTICS

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

RL = 60

Ω, 375 Ω on each

See Figure 2

1.5

2.5

output from –7 to +12 V

Driver differential-output

│VOD│

V

voltage magnitude

RL = 54

Ω (RS-485)

1.5

2.5

See Figure 3

RL = 100

Ω (RS-422)

2

3

Change in magnitude of

RL = 54

Ω, CL = 50 pF

–0.2

0

0.2

Δ│VOD

driver differential-output

See Figure 3

V

│

voltage

Steady-state common-mode

1

VCC / 2

3

VOC(SS)

V

output voltage

Change in differential driver

–0.2

0

0.2

Center of two 27-

Ω load

ΔVOC

common-mode output

See Figure 3

resistors

voltage

mV

Peak-to-peak driver common-

850

VOC(PP)

mode output voltage

Differential output

8

COD

pF

capacitance

Positive-going receiver

35

100

VIT+

differential-input voltage

mV

threshold

Negative-going receiver

–100

–35

VIT–

differential-input voltage

mV

threshold

Receiver differential-input

40

60

VHYS

(1)

voltage threshold hysteresis

mV

(VIT+ – VIT– )

Receiver high-level output

IOH = –8 mA

2.4

VCC – 0.3

VOH

V

voltage

Receiver low-level output

IOL = 8 mA

0.2

0.4

VOL

V

voltage

Driver input, driver enable,

–2

2

II

and receiver enable input

µA

current

(1)

Under any specific conditions, VIT+ is ensured to be at least VHYS higher than VIT–.

4

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