DS1077Z-125+ Analog Devices

DS1077 EconOscillator/Divider www.maxim-ic.com PIN ASSIGNMENT FEATURES Processor-controlled or standalone solid- state oscillator OUT1 1 8 SCL Frequency changes on-the-fly OUT0 2 7 SDA Dual low-jitter, synchronous fixed V 3 6 CTRL1 V DD CC frequency outputs GND 4 5 CTRL0 2-wire serial interface Frequency outputs 8.1kHz to 133MHz 150mil SO 0.5% variation over temp (+25 C to 118mil SOP Package +70C) 0.5% initial tolerance PIN DESCRIPTION Nonvolatile (NV) frequency settings OUT1 - Main Oscillator Output OUT0 - Reference Output Single 5V supply V - Power Supply Voltage CC No external components GND - Ground Power-down mode CTRL1 - Control Pin for OUT1 Synchronous output gating CTRL0 - Control Pin for OUT0 SDA - 2-Wire Serial Data STANDARD FREQUENCY OPTION Input/Output Note: x denotes package option SCL - 2-Wire Serial Clock DS1077x-133 133.333MHz to 16.2kHz DS1077x-125 125.000MHz to 15.2kHz ORDERING INFORMATION DS1077x-120 120.000MHz to 14.6kHz Note: XXX denotes frequency option DS1077x-100 100.000MHz to 12.2kHz DS1077Z-XXX 8-Pin 150mil SO DS1077x-66 66.666MHz to 8.1kHz DS1077U-XXX 8-Pin 118mil SOP 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 SOP packages, allowing the generation of a clock signal easily, economically, and using minimal board area. Chip-scale packaging is also available on request. EconOscillator is a trademark of Dallas Semiconductor. 1 of 21 011006 DS1077 BLOCK DIAGRAM 1077 Figure1 CONTROL SEL0 LOGIC EN0 INTERNAL CTRL0 (TABLE 1) OSCILLATOR PDN0 Select Enable MCLK DIV1 Power-Down 0M1 0M0 MUX P0 PRESCALER 1M1 OUT0 (M DIVIDER) 1M0 EN0 SEL0 0M1 0M0 DIV1 PDN0 PDN1 CONTROL REGISTERS PROGRAMMABLE P1 PRESCALER (M DIVIDER) N DIVIDER OUT1 2-WIRE Power-Down Enable INTERFACE 1M1 1M0 CONTROL PDN1 LOGIC CTRL1 (TABLE 2) SDA SCL 2 of 21