TLK2541

SLLS779B

– JANUARY 2008 – REVISED APRIL 2008

www.ti.com

Table 1. Test Pin Descriptions

SIGNAL

PIN #

TYPE

DESCRIPTION

Lock to Reference. When the LCKREFN pin is asserted active low, the tracking circuitry

LCKREFN

30

Input (w/Pull-up)

on the receiver Clock/Data Recovery (CDR) circuit is disabled and the recovered byte

clock will become a buffered version of REFCLK.

Loop Enable. When LOOPEN is active high, the internal loop-back path is activated. The

transmitted serial data is directly routed internally to the inputs of the receiver. This

LOOPEN

26

Input (w/Pull-down)

provides a self-test capability in conjunction with the protocol device. The DOUTTXP and

DOUTTXN outputs are held in a high impedance state during the loop-back test. LOOPEN

is held low during standard operational state with external serial outputs and inputs active.

PRBS Test Enable. When asserted high results of Pseudo Random Bit Stream (PRBS)

PRBSEN

31

Input (w/Pull-down

tests can be monitored on the PRBSPASS pin. A high on PRBSPASS indicates that valid

PRBS is being received.

TESTEN

32

Input (w/Pull-down)

Test Mode Enable. This pin should be left unconnected or tied low.

Table 2. Power Pin Descriptions

POWER

PIN#

TYPE

DESCRIPTION

2, 11, 22, 29, 42,

VDD

Supply

Digital logic power. Provides power for all digital circuitry and Digital I/O Buffers.

48, 59

Analog Power. VDDA provides a supply reference for the high-speed analog circuits,

VDDA

68, 69, 74

Supply

receiver and transmitter

GROUND

Analog Ground. GNDA provides a ground reference for the high-speed analog circuits,

GNDA

65, 70, 73

Ground

RX and TX.

7, 15, 20, 35, 41,

GND

Ground

Digital Logic Ground. Provides a ground for the logic circuits and digital I/O buffers.

53, 60, 80

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature (unless otherwise noted)

(1)

VALUE

UNIT

–0.3 to 3

V

Voltage range at TXD[0:19], ENABLE, TX_CLK, LOOPEN, PRBSEN, PRE, CTRL0,

–0.3 to 4

V

CTRL1, TXRATE, RXRATE, REFCLK, LCKREFN, TESTEN,RXCODE

Voltage range at any other terminal except above

V

Package power dissipation

See Dissipation Rating Table

Storage temperature

–65 to 150

°C

HBM

2

kV

Electrostatic discharge

CDM

1.5

kV

Characterized free-air operating

PFP

–40 to 85

°C

temperature range

(1)

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

All voltage values, except differential I/O bus voltages, are stated with respect to network ground.

6

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