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Differences Between TLK2201B, TLK2201BI, TLK1221, and TNETE2201

2:1

MUX

PRBS

Generator

10Bit

Registers

TD(0–9)

PRBSEN

LOOPEN

Parallelto

Serial

PhaseGenerator

Clock

REFCLK

Control

Logic

ENABLE

Interpolator

and

ClockExtraction

PRBS

Verification

SerialtoParallel

and

CommaDetect

Clock

RBC1

RBC0

SYNC/PASS

RD(0–9)

SYNCEN

2:1

MUX

2:1

MUX

Clock

Data

TXP

TXN

RXP

RXN

RBCMODE

TLK1221

SLLS713 – FEBRUARY 2007

The TLK1221 is housed in a high-performance, thermally enhanced, 40-pin QFN package. Use of this package

does not require any special considerations except to note that the pad, which is an exposed die pad on the

bottom of the device, is a metallic thermal and electrical conductor. It is required that the TLK1221 pad be

soldered to the thermal land on the board as it serves as the main ground connection for the device.

The TLK1221 is characterized for operation from –40

°C to 85°C.

This device uses a 2.5-V supply. The I/O section is 3.3-V compatible. With the 2.5-V supply, the chipset is very

power-efficient, dissipating less than 200 mW typical power when operating at 1.25 Gbps.

The TLK1221 is designed to be hot-plug capable. A power-on reset causes RBC0, RBC1, the parallel output

signal terminals, TXP, and TXN to be held in the high-impedance state.

The TLK1221 is the functional equivalent of the TNETE2201. There are several differences between the devices

as noted below. Refer to Figure 12 in the application information section for an example of a typical application

circuit.

• V

• The PLL filter capacitors on pins 16, 17, 48, and 49 of the TNETE2201 are no longer required. The

TLK2201B, TLK2201BI, TLK1221, and TLK1201A use these pins to provide added test capabilities. The

capacitors, if present, do not affect the operation of the device.

• No pulldown resistors are required on the TXP/TXN outputs.

• The TLK1221 is a QFN version of the TLK2201B optimized for GBE-only TBI-mode operation with no JTAG

functionality.

Functional Block Diagram

2

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