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Texas Instruments Introduces True Femto-Second Performance Clock Generator for Networking Designs

High-Performance, Fully-Integrated Clock Reduces Design Time and Cost

(PresseBox) (Freising, ) Texas Instruments (TI) (NYSE: TXN) today introduced a low-phase noise clock generator that provides best-in-class jitter performance at 380 femtoseconds (fs) (rms at 10 kHz to 20 MHz). The device incorporates crystal oscillator (XO) circuitry with a fully-integrated frequency synthesizer supporting a wide output frequency range from 10.9 MHz up to 766.7 MHz and from 875.2 MHz up to 1175 MHz, easing design for customers designing Ethernet, fibre channel, PCI Express and Serial ATA products. See

The CDCE421 is available in either its die form to fit in a 5-mm x 7-mm XO package or a 24-pin quad flat no-lead (QFN) package, giving customers flexibility to fit their designs. The new clock device is the first to integrate both on-chip EEPROM and XO circuitry for increased programmability, further simplifying the design by allowing the customer to implement a single device for various frequencies.

All device settings are programmable through a TI proprietary simple serial interface for programming after manufacturing. The device operates in a single 3.3 V supply environment and is characterized for operation in the industrial temperature range from -40C to +85C. Other key features include the following:

• Support for crystal or LVCMOS frequencies between 27.35 MHz and 38.33 MHz

• Low-voltage differential signaling (LVDS) Output, 100-ohm differential off-chip termination, 10.9-MHz to 400-MHz frequency range

• Differential low-voltage positive emitter-coupled logic (LVPECL) Output, 10.9-MHz to 1.175-GHz Frequency Range

• Fully-integrated programmable loop filter from 50 kHz to 400 kHz

• Typical power consumption 240 mW in LVDS mode and 300 mW in LVPECL mode

• Chip-enable control pin

• Electrostatic discharge protection exceeds 2-kV human-body model

• Excellent power supply noise rejection
TI provides a wide selection of timing support devices, both PLL-based and non-PLL-based, to support consumer, communications and memory applications. Information on the complete line of clock products from TI is in the Clocks and Timers Selection Guide, available at

Pricing and Availability
The CDCE421 is available now in either a die form or packaged in a 24-pin QFN package and is priced at $7.00 in 1,000-piece quantities.

Texas Instruments Deutschland GmbH

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