Octal E1 Line Interface — LXT381

Datasheet

9

45

46

N5

P5

TTIP0

TRING0

AO

AO

Transmit Tip Output.

Transmit Ring Output.

These pins are differential line driver outputs designed to drive 75

Ω

unbalanced or 120

Ω balanced cables with a 1:2 transformer and two 11 Ω

series resistors. TRING and TTIP will be in high impedance state if the

TCLK pin is Low.

47

N6, P6

TGND0

S

Transmit Driver Ground. Ground pin for the output driver.

48

49

P7

N7

RTIP0

RRING0

AI

AI

Receive TIP Input.

Receive Ring Input.

These pins are the inputs to the differential line receiver. Data is recovered

and output on the RPOS/RNEG pins.

50

L6, M6

TGND1

S

Transmit Driver Ground.

51

52

M5

L5

TRING1

TTIP1

AO

AO

Transmit Ring Output.

Transmit Tip Output.

53

L4, M4

TVCC1

S

Transmit Driver Power Supply. Power supply pin for the output driver.

54

55

L7

M7

RRING1

RTIP1

AI

AI

Receive Ring Input.

Receive Tip Input.

56

L11, M11

TVCC2

S

Transmit Driver Power Supply.

57

58

L10

M10

TTIP2

TRING2

AO

AO

Transmit Tip Output.

Transmit Ring Output.

59

L9, M9

TGND2

S

Transmit Driver Ground.

60

61

M8

L8

RTIP2

RRING2

AI

AI

Receive TIP Input.

Receive Ring Input.

62

N9, P9

TGND3

S

Transmit Driver Ground. Ground pin for the output driver.

63

64

P10

N10

TRING3

TTIP3

AO

AO

Transmit Ring.

Transmit Tip Output.

65

N11, P11

TVCC3

S

Transmit Driver Power Supply. Power supply pin for the output driver.

66

67

N8

P8

RRING3

RTIP3

AI

AI

Receive Ring Input.

Receive Tip Input.

68

K11

ALOS3

DO

Analog Loss of Signal Output.

69

70

P12

P13

RNEG3

RPOS3

DO

DO

Receive Negative Data Output.

Receive Positive Data Output.

71

P14

RCLK3

DO

Receive Clock Output.

72

73

N12

N13

TNEG3

TPOS3

DI

DI

Transmit Negative Data Input.

Transmit Positive Data Input.

74

N14

TCLK3

DI

Transmit Clock Input.

75

K12

ALOS2

DO

Analog Loss of Signal Output.

76

77

M12

M13

RNEG2

RPOS2

DO

DO

Receive Negative Data Output.

Receive Positive Data Output.

Table 1.

LXT381 Pin Description (Continued)

Pin #

LQFP

Pin #

PBGA

Symbol

Description

1. DI: Digital Input; DO: Digital Output; DI/O: Digital Bidirectional Port; AI: Analog Input; AO: Analog Output S: Power Supply;

N.C.: Not

Connected.