MC1489, MC1489A, SN55189, SN55189A, SN75189, SN75189A

QUADRUPLE LINE RECEIVERS

SLLS095D – SEPTEMBER 1973 – REVISED OCTOBER 1998

8

POST OFFICE BOX 655303

Figure 7

INPUT THRESHOLD VOLTAGE

vs

FREE-AIR TEMPERATURE

2.2

2

1.8

1.6

1.4

1.2

1

0.8

0.6

125

100

75

50

25

0

–25

–50

–75

0.4

150

2.4

TA – Free-Air Temperature – °C

– 100

’89 VIT+

’89A VIT–

’89 VIT–

’89A VIT+

Figure 8

INPUT THRESHOLD VOLTAGE

vs

SUPPLY VOLTAGE

’89A VIT–

’89 VIT+

’89 VIT–

’89A VIT+

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

Figure 9

SN75189

NOISE REJECTION

TA = 25°C

VCC = 5 V

4000

1000

400

100

40

5

4

3

2

1

0

10000

6

tw – Pulse Duration – ns

10

CC = 500 pF

CC = 10 pF

CC = 100 pF

CC = 300 pF

See Note A

NOTE A: Maximum amplitude of a positive-going pulse that,

starting from 0 V, will not cause a change in the

output level.

Figure 10

SN75189A

NOISE REJECTION

CC = 300 pF

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

VCC = 5 V

TA = 25°C

See Note A

NOTE A: Maximum amplitude of a positive-going pulse that,

starting from 0 V, will not cause a change in the

output level.

† Data for free-air temperatures below 0

°C and above 70°C are applicable to SN55189 and SN55189A circuits only.