3

LTC1685

DC ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Resistance

– 7V

q

22

k

Ω

Input Capacitance

A, B Inputs, D, DE, RE

3

pF

Open-Circuit Input Voltage, Figure 5

q

3.2

3.3

3.4

V

Fail-Safe

Time to Detect Fail-Safe Condition

2

µs

Time

CMRR

Receiver Input Common Mode

45

dB

Rejection Ratio

Receiver and Driver Output

(Note 4)

q

500

pF

Load Capacitance

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: All currents into the device pins are positive; all currents out of the

device pins are negative.

Note 4: Guaranteed by design, but not tested.

Note 5: Short-circuit current does not represent output drive capability.

When the output detects a short-circuit condition, output drive current is

significantly reduced (from hundreds of mA to 20mA max) until the short

is removed.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Driver Input-to-Output Propagation Delay

q

15

18.5

22

ns

Figures 3, 5

Driver Output A-to-Output B Skew

500

ps

Figures 3, 5

Driver Rise/Fall Time

3.5

ns

Figures 3, 5

Driver Enable to Output High

q

25

50

ns

Driver Enable to Output Low

q

25

50

ns

Driver Disable from Low

q

25

50

ns

Driver Disable from High

q

25

50

ns

Receiver Input-to-Output Propagation Delay

q

15

18.5

22

ns

Receiver Skew

500

ps

Receiver Enable to Output Low

q

25

50

ns

Receiver Enable to Output High

q

25

50

ns

Receiver Disable from Low

q

25

50

ns

Receiver Disable from High

q

25

50

ns

Maximum Receiver Input

(Note 4)

q

2000

ns

Rise/Fall Times

Package-to-Package Skew

Same Temperature (Note 4)

1.5

ns

Minimum Input Pulse Width

q

17

19.2

ns

Maximum Data Rate

q

52

60

Mbps

Maximum Input Frequency

q

26

30

MHz