3

LTC485

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Driver Input to Output

q

10

30

50

ns

Driver Input to Output

(Figures 3 and 5)

q

10

30

50

ns

Driver Output to Output

q

510ns

Driver Rise or Fall Time

q

315

25

ns

Driver Enable to Output High

q

40

70

ns

Driver Enable to Output Low

q

40

70

ns

Driver Disable Time from Low

q

40

70

ns

Driver Disable Time from High

q

40

70

ns

Receiver Input to Output

q

30

90

200

ns

(Figures 3 and 7)

q

30

90

200

ns

q

13

ns

Receiver Enable to Output Low

q

20

50

ns

Receiver Enable to Output High

q

20

50

ns

Receiver Disable from Low

q

20

50

ns

Receiver Disable from High

q

20

50

ns

3V

DE

A

B

DI

RO

15pF

A

B

RE

LTC485 • F03

OUTPUT

UNDER TEST

S1

S2

500

Ω

LTC485 • F02

Figure 3. Driver/Receiver Timing Test Circuit

Figure 4. Driver Timing Test Load #2

RECEIVER

OUTPUT

15pF

1k

S1

S2

TEST POINT

1k

LTC485 • F02

A

B

R

R

LTC485 • F01

Figure 1. Driver DC Test Load

Figure 2. Receiver Timing Test Load

temperature range.

Note 1: Absolute maximum ratings are those beyond which the safety of

the device cannot be guaranteed.

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

pins are negative. All voltages are referenced to device ground unless

otherwise specified.

Note 4: The LTC485 is guaranteed by design to be functional over a supply

voltage range of 5V

±10%. Data sheet parameters are guaranteed over the

tested supply voltage range of 5V

±5%.

TEST CIRCUITS