SN75LBC773

GEOPORT

™ TRANSCEIVER

SLLS247C – FEBRUARY 1997 – NOVEMBER 1997

5

POST OFFICE BOX 655303

receiver electrical characteristics over recommended operating conditions (unless otherwise

noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIT+

Positive-going input threshold voltage

200

mV

VIT–

Negative-going input threshold voltage

See Figure 6

–200

mV

Vhys

Differential input voltage hysteresis (VIT+ – VIT–)

50

mV

VOH

High-level output voltage (see Note 4)

VIC = 0,

See Figure 6

IOH = –2 mA,

2

4.5

V

VOL

Low-level output voltage

VIC = 0,

See Figure 6

IOL = 2 mA,

0.4

0.8

V

IOS

Short circuit output current

VO = 0

–45

–85

mA

IOS

Short-circuit output current

VO = 5.25 V

45

85

mA

RIN

Input resistance

VCC = 0 or 5.25 V,

–12 V

≤ VI ≤ 12 V

6

30

k

Ω

NOTE 4: If the inputs are left unconnected, receivers one and two interpret this as a high-level input and receiver three interprets this as a low-level

input so that all outputs are at the high level.

receiver switching characteristics over recommended conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPHL

Propagation delay time, high-to-low level output

30

75

ns

tPLH

Propagation delay time, low-to-high level output

RL = 2 kΩ,

CL = 15 pF,

30

75

ns

tr

Rise time

L

,

See Figure 6

L

,

15

30

ns

tf

Fall time

15

30

ns

tSK(P)

Pulse skew |tPLH-tPHL|

20

ns

tPZL

Receiver output enable time to low-level output

35

100

ns

tPZH

Receiver output enable time to high-level output

35

100

ns

tPLZ

Receiver output disable time from low-level

output

Differential

20

100

ns

tPHZ

Receiver output disable time from high-level

output

CL =50 pF

See Figure 7

20

100

ns

tPZL

Receiver output enable time to low-level output

CL = 50 pF,

See Figure 7

12

25

µs

tPZH

Receiver output enable time to high-level output

12

25

µs

tPLZ

Receiver output disable time from low-level

output

Single-ended

25

100

ns

tPHZ

Receiver output disable time from high-level

output

125

400

ns