XRT83SL38 datasheet(22/88 Pages) EXAR

22 / 88 page

XRT83SL38

OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

REV. 1.0.2

POWER AND GROUND

TERSEL1

TERSEL0

T11

R11

Termination Impedance Select bit 1:

Termination Impedance Select bit 0:

In the

Hardware mode and in the internal termination mode (TXTSEL=”1” and RXT-

SEL=”1”) TERSEL[1:0] control the transmit and receive termination impedance accord-

ing to the following table.

In the

internal termination mode the receiver termination of each receiver is realized

completely by internal resistors or by the combination of internal and one fixed external

resistor (see description of RXRES[1:0] pins).

In the

internal termination mode the transformer ratio of 1:2 and 1:1 is required for

transmitter and receiver respectively with the transmitter output AC coupled to the

transformer.

NOTES:

This pin is internally pulled “Low” with a 50k

Ω resistor.

In Hardware mode, all channels share the same TERSEL control function.

In the external termination mode a 1:2 or 1:2.45 transformer ratio must be

used for the transmitter.

TEST

U12

Manufacturing Test:

NOTE: For normal operation this pin must be tied to ground.

ICT

V12

In-Circuit Testing (Active “Low”):

When this pin is tied “Low”, all output pins are forced to a high impedance state for in-

circuit testing.

Pulling RESET and ICT pins “Low” simultaneously will put the chip in factory test mode.

This condition should not be permitted during normal operation.

NOTE: This pin is internally pulled “High” with a 50k

Ω resistor.

SIGNAL NAME

LEAD #

TYPE

DESCRIPTION

TGND_0

TGND_1

TGND_2

TGND_3

TGND_4

TGND_5

TGND_6

TGND_7

E15

C17

T16

R16

****

Transmitter Analog Ground for Channel _0

Transmitter Analog Ground for Channel _1

Transmitter Analog Ground for Channel _2

Transmitter Analog Ground for Channel _3

Transmitter Analog Ground for Channel _4

Transmitter Analog Ground for Channel _5

Transmitter Analog Ground for Channel _6

Transmitter Analog Ground for Channel _7

SIGNAL NAME

LEAD #TYPE

DESCRIPTION

100

110

120

Termination

TERSEL1

TERSEL0

XRT83SL38 Datasheet(PDF) 22 Page - Exar Corporation

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