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DS1077 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1077 Datasheet(HTML) 1 Page - Dallas Semiconductor |
1 / 21 page 1 of 21 022703 FEATURES § Processor-controlled or standalone solid- state oscillator § Frequency changes on-the-fly § Dual low-jitter, synchronous fixed frequency outputs § 2-wire serial interface § Frequency outputs 8.1kHz to 133MHz § ±0.5% variation over temp (+25°C to +70°C) § ±0.5% initial tolerance § Nonvolatile (NV) frequency settings § Single 5V supply § No external components § Power-down mode § Synchronous output gating STANDARD FREQUENCY OPTION Note: x denotes package option DS1077x-133 133.333MHz to 16.2kHz DS1077x-125 125.000MHz to 15.2kHz DS1077x-120 120.000MHz to 14.6kHz DS1077x-100 100.000MHz to 12.2kHz DS1077x-66 66.666MHz to 8.1kHz PIN ASSIGNMENT OUT1 OUT0 1 2 3 4 VDD GND SCL CTRL0 CTRL1 SDA 8 7 6 5 PIN DESCRIPTION OUT1 - Main Oscillator Output OUT0 - Reference Output VCC - Power Supply Voltage GND - Ground CTRL1 - Control Pin for OUT1 CTRL0 - Control Pin for OUT0 SDA - 2-Wire Serial Data Input/Output SCL - 2-Wire Serial Clock ORDERING INFORMATION Note: XXX denotes frequency option DS1077Z-XXX 8-Pin 150mil SO DS1077U-XXX 8-Pin 118mil µSOP DESCRIPTION The DS1077 is a dual-output, programmable, fixed-frequency oscillator requiring no external components for operation. The DS1077 can be used as a processor-controlled frequency synthesizer or as a standalone oscillator. The two synchronous output operating frequencies are user-adjustable in submultiples of the master frequency through the use of two on-chip programmable prescalers and a divider. The specific output frequencies chosen are stored in NV (EEPROM) memory. The DS1077 defaults to these values upon power-up. The DS1077 features a 2-wire serial interface that allows in-circuit on-the-fly programming of the programmable prescalers (P0 & P1) and divider (N) with the desired values being stored in NV (EEPROM) memory. Design changes can be accommodated in-circuit on-the-fly by simply programming different values into the device (or reprogramming previously programmed devices). Alternatively, for fixed frequency applications, previously programmed devices can be used and no connection to the serial interface is required. Pre-programmed devices can be ordered in customer- requested frequencies. The DS1077 is available in 8-pin SO or µSOP packages, allowing the generation of a clock signal easily, economically, and using minimal board area. Chip-scale packaging is also available on request. DS1077 EconOscillator/Divider www.maxim-ic.com 150mil SO 118mil µSOP Package VCC EconOscillator is a trademark of Dallas Semiconductor. |
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