TLK2501

1.5 TO 2.5 GBPS TRANSCEIVER

SLLS427D − AUGUST 2000 − REVISED JULY 2003

2

POST OFFICE BOX 655303

description (continued)

The TLK2501 provides an internal loopback capability for self-test purposes. Serial data from the serializer is

passed directly to the deserializer, allowing the protocol device a functional self-check of the physical interface.

The TLK2501 is designed to be hot plug capable. An on-chip power-on reset circuit holds the RX_CLK low

during power up. This circuit also holds the parallel side output signal terminals as well as DOUTTXP and

DOUTTXN in a high-impedance state during power up.

The TLK2501 has a loss of signal detection circuit for conditions where the incoming signal no longer has a

sufficient voltage amplitude to keep the clock recovery circuit in lock.

To prevent a data bit error from causing a data packet from being interpreted as a comma and thus causing the

erroneous word alignment by the comma detection circuit, the comma word alignment circuit is turned off after

the link is properly established in TLK2501.

The TLK2501 allows users to implement redundant ports by connecting receive data bus terminals from two

TLK2501 devices together. Asserting the LCKREFN to go to a low state causes the receive data bus terminals,

RXD[0:15], RX_CLK and RX_ER, RX_DV/LOS to go to a high-impedance state. This places the device in a

transmit-only mode since the receiver is not tracking the data.

The TLK2501 uses a 2.5-V supply. The I/O section is 3 V compatible. With the 2.5-V supply the chipset is very

power-efficient, consuming less than 360 mW typically. The TLK2501 is characterized for operation from −40

°C

to 85

°C.

AVAILABLE OPTIONS

PACKAGE

TA

PowerPAD QUAD FLATPACK

(VQFP)

−40

°C to 85°C

TLK2501IRCP

−40

°C to 85°C

TLK2501IRCPR