SN75185

MULTIPLE RS-232 DRIVERS AND RECEIVERS

SLLS181A – DECEMBER 1994 – REVISED NOVEMBER 1998

8

POST OFFICE BOX 655303

TYPICAL CHARACTERISTICS

RECEIVER SECTION

Figure 11

INPUT THRESHOLD VOLTAGE

vs

FREE-AIR TEMPERATURE

2.2

2

1.8

1.6

1.4

1.2

0.8

0.6

0.4

2.4

TA – Free-Air Temperature – °C

VT –

VT +

70

60

50

40

30

20

10

0

Figure 12

INPUT THRESHOLD VOLTAGE

vs

SUPPLY VOLTAGE

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

9

8

7

6

5

4

3

0

10

2

VCC – Supply Voltage – V

2

VT –

VT +

Figure 13

Figure 14

NOISE REJECTION

CC = 300 pF

VCC = 5 V

TA = 25°C

See Note A

10

tw – Pulse Duration – ns

6

10000

0

1

2

3

4

5

40

100

400

1000

4000

CC = 500 pF

CC = 12 pF

CC = 100 pF

NOTE A: This figure shows the maximum amplitude of a

positive-going pulse that, starting from 0 V, will not cause

a change in the output level.

MAXIMUM SUPPLY VOLTAGE

vs

FREE-AIR TEMPERATURE

RL ≥ 3 kΩ (from each output to GND)

14

12

10

8

6

4

2

70

60

50

40

30

20

10

0

16

TA – Free-Air Temperature – °C

0