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Page 7 of 8

Issue A

LANSDALE Semiconductor, Inc.

ML145407

1 VDD

VCC

C1+ 20

C2+

1

10

µF

ML145407

ML145406

2

3

4

5

6

7

89

10

11

12

13

14

15

16

2

3

4

5

6

7

8

11

12

13

14

15

16

9

10

17

18

19

Rx1

Tx1

Rx2

Tx2

Rx3

Tx3

VSS

DO1

DI1

DO2

DI2

DO3

DI3

GND

GND

C2–

VSS

Rx1

Tx1

Rx2

Tx2

Rx3

Tx3

DI3

DO3

DI2

DO2

DI1

DO1

VDD

C1–

VCC

+ 5 V

10

µF

10

µF

10

µF

Figure 5. ML145406/ML145407 5 V Only Solution for up to Six EIA–232–E Drivers and Receivers

C1+

C1–

VCC

0.1

µF

1

20

2

19

3

18

4

17

5

16

6

15

7

14

8

13

9

12

10

11

C4

C2

C2+

GND

C2–

VSS

VDD

0.1

µF

+ 10 V

+ 5 V

Figure 6. Two Supply Configuration (ML145407 Generates VSS Only)

C1+

C1–

DO1

DI1

DO2

DI2

DO3

DI3

VCC

0.1

µF

1

20

2

19

3

18

4

17

5

16

6

15

7

14

8

13

TO

CONNECTOR

MMBZ15VDLT

× 6

9

12

10

11

C4

C2

C2+

GND

C2–

Rx1

Tx1

Rx2

Tx2

Rx3

Tx3

VSS

VDD

0.1

µF

C3

C1

+ 5 V

Figure 7. ESD Protection Scheme