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ICM7213IPD Datasheet(PDF) 6 Page - Intersil Corporation |
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ICM7213IPD Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 6 page 6 All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com Sales Office Headquarters NORTH AMERICA Intersil Corporation 7585 Irvine Center Drive Suite 100 Irvine, CA 92618 TEL: (949) 341-7000 FAX: (949) 341-7123 Intersil Corporation 2401 Palm Bay Rd. Palm Bay, FL 32905 TEL: (321) 724-7000 FAX: (321) 724-7946 EUROPE Intersil Europe Sarl Ave. C - F Ramuz 43 CH-1009 Pully Switzerland TEL: +41 21 7293637 FAX: +41 21 7293684 ASIA Intersil Corporation Unit 1804 18/F Guangdong Water Building 83 Austin Road TST, Kowloon Hong Kong TEL: +852 2723 6339 FAX: +852 2730 1433 Detailed Description Supply Voltage Considerations The ICM7213 may be used to provide various precision outputs with frequencies from 2048Hz to 1/60Hz using a 4.194304MHz quartz oscillator, and other output frequencies may be obtained using other quartz crystal frequencies. Since the ICM7213 uses dynamic high frequency dividers for the initial frequency division there are limitations on the VSUPPLY range depending on the oscillator frequency. If, for example, a low frequency quartz crystal is selected, the VSUPPLY should be selected in the center of the operating window, or approximately 1.7V. The VSUPPLY to the ICM7213 may be derived from a high voltage supply by using a simple resistor divider (if power is of no concern), by using a series resistor for minimum current consumption, or by means of a regulator. Outputs Pull up resistors will generally be required to interface with other logic families. These resistors must be connected between the various outputs and the positive power supply. Oscillator Considerations The oscillator consists of a CMOS inverter and a feedback resistor whose value is dependent on the voltage at the oscillator input and output terminals and the VSUPPLY. Oscillator stabilities of approximately 0.1ppm per 0.1V varia- tion are achievable with a nominal VSUPPLY of 5V and a sin- gle voltage dropping resistor. The crystal specifications are shown in the Test Circuit. It is recommended that the crystal load capacitance (CL) be no greater than 22pF for a crystal having a series resistance equal to or less than 75 Ω, otherwise the output amplitude of the oscillator may be too low to drive the divider reliably. It a very high quality oscillator is desired, it is recommended that a quartz crystal be used having a tight tuning tolerance ±10ppm, a low series resistance (less than 25Ω), a low motional capacitance of 5mpF and a load capacitance of 20pF. The fixed capacitor CIN should be 30pF and the oscil- lator tuning capacitor should range between approximately 16pF and 60pF. Use of a high quality crystal will result in typical stabilities of 0.05ppm per 0.1V change of VSUPPLY. Control Inputs The TEST input inhibits the 218 output and applies the 29 output to the 221 divider, thereby permitting a speedup of the testing of the ÷ 60 section by a factor of 2048 times. This also results in alternative output frequencies (see table). The WIDTH input may be used to change the pulse width of OUT 4 from 125ms to 1s, or to change the state of OUT 4 from ON to OFF during INHIBIT. See Figures 1 and 2 for output waveforms and effect of control inputs. ICM 7213 VS+ R1 R2 I2 VS - I1 VDD VSS CBYPASS 0.01µF EXAMPLE: f = 4.2MHz 8V ≤ V ≤ 12V (10 NOMINAL) I1 ≈ 100µA I2 ≈ 1mA R2 ≈ 3kΩ R1 ≈ 6.8kΩ FIGURE 9A. EXAMPLE: fOSC = 4.2MHz 8V ≤ V ≤ 12V (10 NOMINAL) I1 ≈ 100µA R3 = (10 - 3) 10 - 4 ≈ 68kΩ k Ω ICM 7213 VS+ R3 VS - I1 VDD VSS CBYPASS 0.01µF FIGURE 9B. FIGURE 9. BIASING SCHEMES WITH HIGH VOLTAGE SUPPLIES ICM7213 |
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