 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| VT98521 3.3V Clock Multiplier Applications *= Low cost general-purpose clock source General Description The VT98521 is a 3.3V CMOS, clock multiplier integrated circuit. The device provides an excellent quality high frequency output clock from a lower frequency crystal or clock input. Tri-level selection inputs S0 and S1 are used to select any one of eight multipliers, stored in the on-board ROM, and apply it to the input to produce the desired output, up to 220 MHz. Phase Locked Loop (PLL) technology allows the device to use an input signal from an inexpensive crystal. When Output Enable (OE) is low, the clock output is in high impedance state. The VT98521, when used with an inexpensive crystal, provides a cost-effective clock source for most electronic systems. Features *= *= *= *= *= *= Low phase noise Zero ppm multiplication error Input clock frequency 5 - 50 MHz. Input crystal frequency 5 - 27 MHz Output clock frequencies up to 220 MHz. 5V-tolerant inputs and output *= *= *= *= Fully Compatible with all popular CPUs Duty Cycle - 45/55 up to 160 MHz. - 40/60 160 MHz to 220 MHz 25mA drive capability at TTL levels High-Z output for board level testing Figure 1. Functional Block Diagram Figure 2. Pin Assignment VDD GND 8-pin SOIC/MSOP S0 S1 Clock or Xtal X1/ICLK input PLL Clock Multiplier & ROM Xtal. Osc. Output Buffer CLK X1/ICLK VDD GND S1 1 2 3 4 8 7 6 5 X2 OE S0 CLK X2 Optional caps Output Enable 2002-02-25 Vaishali Semiconductor Page 1 www.vaishali.com 747 Camden Avenue, Suite C Campbell MDST-0017-02 CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VT98521 Table 1. Clock Output Table S1 0 0 0 M M M 1 1 1 S0 0 M 1 0 M 1 0 M 1 CLK 4 x input 5.3125 x input 5 x input 6.25 x input Test* 3.125 x input 6 x input 3 x input 8 x input Minimum Input See table 6 20 MHz See table 6 4 MHz 8 MHz See table 6 See table 6 See table 6 0 = Connect to ground. 1 = Connect directly to VDD M = Leave unconnected (floating) * = For Vaishali internal test purposes only Table 2. Pin Description No. 1 2 3 4 5 6 7 8 Name X1/ICLK VDD GND S1 CLK S0 OE X2 Type I P P TI O TI I O Description Xtal connection or clock input. Connect to +3.3V Connect to ground. Select 1 for output clock. Connect to ground or VDD or float Clock output per table 2. Select 0 for output clock. Connect to ground or VDD or float. Output Enable. Tri- states CLK output when low. Xtal connection. Leave unconnected for clock input. Legend: I = Input TI = Tri-level Input O = Output P = Power supply connection Table 3. Absolute Maximum Ratings Parameter Supply voltage, VDD Inputs and Clock Outputs Soldering Temperature Storage temperature Conditions Referenced to GND Referenced to GND Max of 10 seconds Min -0.5 Typ Max 4.6 4.6 260 Units V V C C -65 150 2002-02-25 Vaishali Semiconductor Page 2 www.vaishali.com 747 Camden Avenue, Suite C Campbell MDST-0017-02 CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VT98521 Table 4. Operating Conditions Parameter Ambient Operating Temperature Operating Voltage, VDD Input High Voltage, VIH, X1 pin only Input Low Voltage, VIL, X1 pin only Input High Voltage, VIH, OE pin Input Low Voltage, VIL, OE pin Input High Voltage, VIH, trinary inputs Input Low Voltage, VIL, trinary inputs VDD-0.5 0.5 2 0.8 Min 0 3 2.5 Typ Max 70 3.6 Units C V V 1.65 1.65 0.5 V V V V V DC Characteristics Table 5. DC Characteristics VDD = 3V to 3.6V Parameter Output High Voltage, VOH Output Low Voltage, VOL Operating Supply Current, IDD (20 MHz Xtal) Short Circuit Current Input Capacitance Frequency synthesis error Condition IOH=-25mA IOL=25mA No Load, 100MHz CLK output S0, S1, OE, X1, X2 Min 2.4 Typ Max 0.4 Units V V mA mA pF 25 100 4 0 ppm 2002-02-25 Vaishali Semiconductor Page 3 www.vaishali.com 747 Camden Avenue, Suite C Campbell MDST-0017-02 CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VT98521 AC Characteristics Table 6 AC Characteristics VDD = 3V to 3.6V over the operating temperature range Symbol fosc fin fout tr tf tod Parameter Input Crystal Frequency Input clock frequency Output Frequency, Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Condition Min 5 5 24 Typ Max Units 27 50 220 MHz MHz MHz ns ns 55 60 % % kHz 50 50 ns ns ps 0.8 to 2.0V 2.0 to 0.8V 1.5 V up to 160 MHz 160 MHz to 220 MHz 45 40 10 1 1 49 to 51 PLL Bandwidth TPZH, TPZL TPHZ, TPLZ tjit (abs) Output Enable Time, OE high to output on Output Disable time, OE low to Tri-state Absolute Clock period Jitter Deviation from mean fout = 160 MHz tjit (sigma) One Sigma Clock Period Jitter fout = 160 MHz 70 25 ps Note1: External Crystal Connection. The external crystal should be connected in as close physical proximity to the VT98521 as possible. The crystal should be a fundamental mode, parallel resonant. Do not use third overtone. External load capacitors should be fitted in accordance with the crystal manufacturer's specifications. Note2: Decoupling and termination. Decoupling capacitors of 0.01 F and 0.1 F should be connected between VDD and Ground. Capacitors should be mounted as close to the chip as possible. A 33 termination resistor may be connected in series with the clock output in order to minimize ringing and reflections. Figure 3. External Crystal Connection Block Diagram Crystal X2 XTAL OSC X1 CX2 CX1 33pF CX1 PLL PLL CLOCK GEN. OE CLK CLK3 106.25MHz External Crystal Load Capacitors 2002-02-25 Vaishali Semiconductor Page 4 www.vaishali.com 747 Camden Avenue, Suite C Campbell MDST-0017-02 CA 95008 Ph. 408.377.6060 Fax 408.377.6063 VT98521 Package Dimensions. MSOP SYMBOLS VARIATIONS (ALL ARE IN MM) AA MIN 0 0.75 0.22 0.08 NOM 0.85 3.00 BSC 4.90 BSC 3.00 BSC 0.6 0.65 MAX 1.1 0.15 0.95 0.38 0.23 A A1 A2 b c D E E1 L e oc OC1 0.4 0 5 0.8 8 15 All dimensions are in millimeters SOIC SYMBOLS VARIATIONS (ALL ARE IN MM) AA MIN 1.35 .011 0.33 0.19 4.80 3.80 5.80 0.25 0 0.40 NOM 1.55 0.42 0.22 4.90 3.90 1.27 BSC 6.00 0.38 5 8 MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 0.50 8 1.27 A A1 B C D E1 e E h oc L N All dimensions are in millimeters Ordering Information Part Number VT98521S1 VT98521S1X VT98521M VT98521MX VT98521/D VT98521/DW 2002-02-25 Vaishali Semiconductor Marking VT98521S1 VT98521S1 VT98521M VT98521M Shipping/Packaging Tubes Tape & Reel Tubes Tape & Reel Dice in waffle-packs Dice in wafer form No. of Pins 8 8 8 8 Package SOIC SOIC MSOP MSOP Temperature o o 0 C to +70 C o o 0 C to +70 C o o 0 C to +70 C o o 0 C to +70 C o o 0 C to +70 C o o 0 C to +70 C MDST-0017-02 Page 5 www.vaishali.com 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063 |
Price & Availability of VT98521
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |