FD5144T-25.0M-PLE

FD5T Series Programmable CMOS Clock Oscillator November 2008 • Pletronics’ FD5T Series is a quartz crystal controlled precision square wave generator with a programmable CMOS output • Output frequency from 12 KHz to 230 MHZ • Selectable low jitter or spread spectrum output. • Device characteristics may be either factory or field programmable • 1.8V, 2.5 or 3.3V LVCMOS outputs Vdd 1.8V (5) Vddout (6) Reference oscillator optional Voltage controlled • 3.2 x 5 mm LCC Ceramic Package • Low power • This is a low cost, mass produced oscillator. • Tape and Reel or cut tape packaging is available. • Designed for high density SMD needs • Excellent frequency stability options Optional Vcontrol S2/SCL (1) S1/SDA (2) Ground (3) PLL Multiplier #1 optional Spread Spectrum optional Bypass Mode MUX #1 Divider #1 /1 to /1023 Y1 (4) Out - Programming control - eePROM - SDA/SCL Registers - Sx Control Pletronics Inc. certifies this device is in accordance with the RoHS 6/6 (2002/95/EC) and WEEE (2002/96/EC) directives. Pletronics Inc. guarantees the device does not contain the following: Cadmium, Hexavalent Chromium, Lead, Mercury, PBB’s, PBDE’s Weight of the Device: 0.09 grams Moisture Sensitivity Level: 1 As defined in J-STD-020C Second Level Interconnect code: e4 Absolute Maximum Ratings: Parameter VDD VDDOUT Vi Vo Io Input Voltage Output Voltage Continuous Output Current Unit -0.5V to +2.5V -0.5V to +4.6V -0.5V to VDD+ 0.5V -0.5V to VDDOUT + 0.5V _ 50 mA + 125oC 50oC/Watt Tj Maximum Junction Temperature Thermal Resistance, Junction to Case Product information is current as of publication date. The product conforms to specifications per the terms of the Pletronics standard warranty. Production processsing does not necessarily include testing of all parameters. Copyright © 2008, Pletronics Inc. FD5T Series Programmable CMOS Clock Oscillator November 2008 Description: The FD5T series Programmable CMOS Clock Oscillator is a modular PLL-based low cost, highperformance oscillator. The frequency range is from 12KHz to 230MHZ. The FD5T base frequency, as noted in the device part number, is established during manufacture and is permanently fixed. For convenience, the divider for output OUT characteristics may be pre-programmed at the factory, or field programmed. The FD5T has a separate output supply pin, VDDOUT, for either 1.8, 2.5 or 3.3V output logic levels. The device supply, VDD which provides power to all the internal circuits, is nominally 1.8V. The deep M/N PLL divider ratio allows the generation of zero-ppm clocks for applications such as WLAN, BlueTooth, Ethernet, USB, IEEE1394, etc. from the base frequency. The PLL supports Spread Spectrum Clocking (SSC). SSC may be programmed to be either centerspread or down-spread. This is an important technique to reduce electro-magnetic interference (EMI). The device supports non-volatile eePROM programming for easy customization of the device. As shipped, the device is pre-programmed. Standard combinations are denoted by three characters in the device part number. However, the FD5T may be reprogrammed to a different configuration. Reprogramming may be either prior to assembly, or in-circuit via a 2-wire SDA/SCL I2C bus. In-circuit programming is not allowed if the VCXO function is needed. Two programmable control inputs, S1 and S2, may be used to control various aspects of FD55T operation including selection of alternative frequency set(s), selection of SSC functionality, output tri-state and power-down. Reference Oscillator The Reference Oscillator is an AT cut quartz crystal based oscillator. This oscillator is very similar to the Pletronics SM77xxH product oscillator. This signal is the lowest jitter and can be an output or can be divided down by the Divider #1. The user may specify any frequency between 12MHz and 32MHz for this reference. All output frequencies are derived from (referenced to) this Reference Oscillator. The VCXO input has a limited voltage range, the VCXO is associated with the internal 1.8V core. A resistor in series with the Vcontrol input will permit interfacing to 3.3V analog circuits, the voltage range that changes the frequency will still be limited but the larger voltages swings will not cause problems. The VCXO function is only enabled (internally connected) if the part number indicates a VCXO specification. When the VCXO function is enabled the I2C programming mode will be disabled. PLL Multipliers The PLL Multiplier can multiply the Reference Oscillator frequency from 1 (bypass mode) to any value that is