Overview
Description
The 281 field programmable spread spectrum clock synthesizer generates up to three high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals, crystal oscillators and stand alone spread spectrum devices in most electronic systems. Using IDT's VersaClockTM software to configure PLLs and outputs, the 281 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include input/output frequencies, spread spectrum amount and eight selectable configuration registers. Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The 281 is also available in factory programmed custom versions for high-volume applications.
Features
- Packaged as 16-pin TSSOP – Pb-free, RoHS compliant
- Eight addressable registers
- Replaces multiple crystals and oscillators
- Output frequencies up to 200 MHz at 3.3 V
- Configurable Spread Spectrum Modulation
- Input crystal frequency of 5 to 27 MHz
- Input clock frequency of 3 to 166 MHz
- Up to three reference outputs
- Operating voltages of 3.3 V
- VDDO output control from 1.8 V to 3.3 V
- Controllable output drive levels
- Advanced, low-power CMOS process
Comparison
Applications
Design & Development
Software & Tools
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Support
Support Communities
Support Communities
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ISL49212 Daisy Chain
Hi EveryOne, actually now I am using the Daisy chain Concept . In the first master circuit, I am connecting the 12 cells and in the next slave circuit I am connecting to the 11 cells but I got a fault detected like that "Fault Detected open-wire cell " why did ...
Jul 6, 2022 -
LittleFS usb drive
Is there a USB drive routine about littlefs?Thanks
Jul 13, 2022 -
Eval kit I2C bus sometimes just stops responding
Hey everyone super confusing issue I've run into here and wanted to see if anyone else has encountered this. First a bit about my setup I am using an evaluation board for the RA2L1 family (called the EK-RA2L1) and my FSP version is 3.8.0, and this ...
Jul 12, 2022