SN65HVD09

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

PIN FUNCTIONS

PIN

LOGIC

I/O

TERMINATION

DESCRIPTION

LEVEL

NAME

NO.

4,6,8,10,

1A to 9A

19,21,23,

TTL

I/O

Pullup

1A to 9A carry data to and from the communication controller.

25,27

29,31,33,

35,37,.46

1B– to 9B–

RS-485

I/O

Pulldown

1B– to 9B– are the inverted data signals of the balanced pair to/from the bus.

,

48,50,52

30,32,34,

1B+ to 9B+

36,38,47,

RS-485

I/O

Pullup

1B+ to 9B+ are the noninverted data signals of the balanced pair to/from the bus.

49,51,53

BSR is the bit significant response. BSR disables receivers 1 through 8 and enables

BSR

2

TTL

Input

Pullup

wired-OR drivers when BSR and DE/RE and CDE1 or CDE2 are high. Channel 9 is

placed in a high-impedance state with BSR high.

CDE0 is the common driver enable 0. Its input signal enables all drivers when CDE0 and

CDE0

54

TTL

Input

Pulldown

1DE/RE – 9DE/RE are high.

CDE1 is the common driver enable 1. Its input signal enables drivers 1 to 4 when CDE1 is

CDE1

55

TTL

Input

Pulldown

high and BSR is low.

CDE2 is the common driver enable 2. When CDE2 is high and BSR is low, drivers 5 to 8

CDE2

56

TTL

Input

Pulldown

are enabled.

CRE

3

TTL

Input

Pullup

CRE is the common receiver enable. When high, CRE disables receiver channels 5 to 9.

5,7,9,11,

1DE/RE–9DE/RE are direction controls that transmit data to the bus when it and CDE0

1DE/RE to

20,22,24,

TTL

Input

Pullup

are high. Data is received from the bus when 1DE/RE–9DE/RE and CRE and BSR are

9DE/RE

26,28

low and CDE1 and CDE2 are low.

1,13,14,

15,16,17,

GND is the circuit ground. All GND terminals except terminal 1 are physically tied to the

GND

NA

Power

NA

40,41,42,

43,44

12,18,39,

NA

Power

NA

Supply voltage

45

(1)

Terminal 1 must be connected to signal ground for proper operation.

2

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