PDF ICD2051 Data sheet ( Hoja de datos )

Número de pieza	ICD2051
Descripción	Dual Programmable Clock Generator
Fabricantes	Cypress Semiconductor
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No Preview Available ! fax id: 35121ICD2051 ICD2051 Dual Programmable Clock Generator Features • Two independent clock outputs ranging from 320 kHz to 100 MHz • Individually programmable PLLs use 22-bit serial word • Low-skew ÷1,÷2, and ÷4 CLKA outputs • Phase-locked loop oscillator input derived from exter- nal low-frequency reference clock (1 MHz - 25 MHz) or external crystal (2 MHz - 24 MHz) • Sophisticated internal loop-filter requires no external www.DataSheet4Uc.coommponents or manufacturing tweaks as commonly re- quired with external filters • Three-state control disables outputs for test purposes (optional) • 5V operation • Low-power, high-speed CMOS technology • Available in 16-pin SOIC package Functional Description The ICD2051 Programmable Clock Generator offers two fully user-programmable phase-locked loops in a single package. The outputs may be changed “on the fly” to any desired fre- quency value between 320 kHz and 100 MHz. The ICD2051 is ideally suited for any design where one or more multiple or varying frequencies are required, thus replacing more expen- sive metal can oscillators. The capability to dynamically change the output frequency adds a whole new degree of freedom for the electrical engi- neer. Some examples of the uses for this device include: lap- top computers, in which slowing the speed of operation can mean less power consumption or speeding it up can mean faster operation; graphics board dot clocks to allow dynamic synchronization with different brands of monitors or display formats; and on-board test strategies where the ability to skew a system’s desired frequency (for example ±10%) al- lows worst case evaluations. Logic Block Diagram f(REF) XTALIN XTALOUT ÷q Phase Detector Charge Pump VCO 7 Internal Loop Filter µCode Decode ÷2p 7 3 post-VCO divider select 4 VCO range select Phase-Locked Loop Oscillator Section A MUXREFA MUX GND VDD SCLKA DATA 22 Serial Rcvr A SCLKB MUXREFB PLL SectionB 22 Serial Rcvr B ÷2 ÷4 MUX CLKA CLKA/2 CLKA/4 XBUF CLKB OEA OEB ICD2051–1 Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600 January 1995 – Revised April 1995 1 page ICD2051:1/95 Revision: April 11, 1995 ICD2051 Maximum Ratings (Above which the useful life may be impaired. For user guide- lines, not tested.) Supply Voltage to Ground Potential .................−0.5V to +7.0V DC Input Voltage ......................................... −0.5V to VDD +0.5V Storage Temperature ....................................... −65°C to +150°C Max soldering temperature (10 sec) ............................ 260°C Junction temperature ................................................... 125°C Operating Conditions Parameter www.DataSheet4U.com VDD TA CL Description Supply Voltage Ambient Operating Temperature Load Capacitance Package power dissipation..................................525 mWatts Operating Range Ambient Temperature 0°C ϖ TAMBIENT ϖ 70°C VDD & AVDD 5V ± 5% Min. 4.75 0 Max. 5.25 70 25 Unit V °C pF Electrical Characteristics Over the Operating Range Parameter VOH VOL VIH VIL IIH IIL IOZ IDD Description Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Output Leakage Current Power Supply Current Test Conditions IOH = −4.0mA IOL = 4.0 mA Except XTALIN pins Except XTALIN pins VIN = 5.25V VIN = 0V Three-state outputs VDD = VDD max., 100 MHz, VIN = VDD or 0V Min. 2.4 2.0 15 Max. 0.4 0.8 150 −250 10 100 Unit V V V V µA µA µA mA 5 5 Page

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