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Exar Coporation 48720 Kato Road, Fremont CA, 94538 • (50) 668-7000 • Fax (50) 668-707 • www.exar.com

SP505_00_08308

These are stress ratings only and functional operation

of the device at these ratings or any other above those

indicated in the operation sections of the specifications

below is not implied. Exposure to absolute maximum

rating conditions for extended periods of time may

affect reliability.

V

Input Voltages:

Logic............................-0.3V to (V

Drivers.........................-0.3V to (V

Receivers........................................±5.5V

Output Voltages:

Logic............................-0.3V to (V

Drivers................................................±5V

Receivers.....................-0.3V to (V

Storage Temperature.......................-65˚C to +150˚C

Power Dissipation.........................................2000mW

Package Derating:

ø

ø

STORAGE CONSIDERATIONS

Due to the relatively large package size of the 80-pin

quad flat-pack, storage in a low humidity environment

is preferred. Large high density plastic packages

are moisture sensitive and should be stored in Dry

Vapor Barrier Bags. Prior to usage, the parts should

remain bagged and stored below 40°C and 60%RH.

If the parts are removed from the bag, they should be

used within 48 hours or stored in an environment at

or below 20%RH. If the above conditions cannot be

followed, the parts should be baked for four hours at

25°C in order remove moisture prior to soldering.

Exar ships the 80-pin QFP in Dry Vapor Barrier Bags

with a humidity indicator card and desiccant pack. The

humidity indicator should be below 30%RH.

ABSOLUTE MAXIMUM RATINGS

PARAMETER

MIN

TYP

MAX

UNITS

CONDITIONS

LOGIC INPUTS

V

IL

0.8

Volts

V

IH

2.0

Volts

LOGIC OUTPUTS

V

OL

0.4

Volts

I

V

OH

2.4

Volts

I

V.28 DRIVER OUTPUT DC PARAMETERS

Open Circuit Voltage

+/-5

Volts

Per Figure 

Loaded Voltage

+/-5.0

+/-5

Volts

Per Figure 2

Short-Circuit Current

+/-00

mA

Per Figure 4

Power-Off Impedance

300

Ω

Per Figure 5

V.28 DRIVER OUTPUT AC PARAMETERS (Vcc = +5V for AC Parameters)

Transition Time

.5

µs

Per Figure 6; +3V to -3V

Instantaneous Slew Rate

30

V/ µs

Per Figure 3

Propagation Delay t

PHL

0.5



5

µs

Propagation Delay t

PLH

0.5



5

µs

Max. Transmission Rate

20

230

kbps

V.28 RECEIVER INPUT DC PARAMETERS

Input impedance

3

7

kΩ

Per Figure 7

Open-Circuit Bias

+2.0

Volts

Per Figure 8

HIGH Threshold

.7

3.0

Volts

LOW Threshold

0.8

.2

Volts

ELECTRICAL CHARACTERISTICS

T