78P2344JAT datasheet(13/37 Pages) TERIDIAN

13 / 37 page

78P2344JAT

4-port E3/DS3/STS-1 LIU

with Jitter Attenuator

Page 13 of 37

2005 Teridian Semiconductor Corporation

Rev 2.2

PIN DESCRIPTION

LEGEND

TYPE

DESCRIPTION

TYPE

DESCRIPTION

Analog Pin

CIT

CMOS 3-State Input

CMOS Digital Input

CMOS Digital Output

CIU

CMOS Digital Input w/ Pull-up

COZ

CMOS Tristate Digital Output

CID

CMOS Digital Input w/ Pull-down

Supply

CIS

CMOS Schmitt Trigger Input

Ground

TRANSMITTER PINS

NAME

TYPE

DESCRIPTION

TPOSx

23, 31

39, 47

Transmit Positive Data/Transmit NRZ:

When ENDECB =’1’, a logic one on this pin generates a positive AMI

pulse on the coax. This pin should not be high at the same time that

corresponding TNEGx is high.

When ENDECB =’0’, data on this pin is encoded and converted into

positive and negative AMI pulses.

TNEGx

24, 32

40, 48

Transmit Negative Data:

When ENDECB =’1’, a logic one on this pin generates a negative AMI

pulse on the coax. This pin should not be high at the same time that

corresponding TPOSx is high.

When ENDECB =’0’, this pin is ignored.

TCLKx

25, 33

41, 49

CIS

Transmitter Clock Input:

This signal is used to latch the respective TPOSx and TNEGx signals

into the 78P2344JAT.

LOUTPx

LOUTNx

98, 92

85, 79

99, 93

86, 80

Line Out:

Differential AMI Outputs. Requires a 1:2CT center-tapped

transformer and a shunt termination resistor. See APPLICATION

INFORMATION section for more info.

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