DS1077LU-40+T Analog Devices

DS1077L 3V EconOscillator/Divider www.maxim-ic.com FEATURES PIN ASSIGNMENTS Processor-controlled or stand-alone 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 CC frequency outputs GND 4 5 CTRL0 2-wire serial interface Frequency outputs 4.87kHz to 66.666MHz 150mil SO 1.25% variation over temperature and 118mil SOP voltage 0.5% initial tolerance PIN DESCRIPTIONS Nonvolatile frequency settings OUT1 - Main Oscillator Output Single 2.7V to 3.6V supply OUT0 - Reference Output No external components V - Power-Supply Voltage CC 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 DS1077Lx-40 40.000MHz to 4.87kHz DS1077Lx-50 50.000MHz to 6.09kHz ORDERING INFORMATION DS1077Lx-60 60.000MHz to 7.32kHz Note: XXX denotes frequency option DS1077Lx-66 66.666MHz to 8.13kHz DS1077LZ-XXX 8-pin 150mil SO Contact the factory for the availability of DS1077LU-XXX 8-pin 118mil SOP additional frequencies. DESCRIPTION The DS1077L is a dual-output, programmable, fixed-frequency oscillator requiring no external components for operation. The DS1077L can be used as a processor-controlled frequency synthesizer or as a stand-alone 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 dividers. The specific output frequencies chosen are stored in nonvolatile (EEPROM) memory. The DS1077L defaults to these values upon power-up. The DS1077L 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 nonvolatile (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. Preprogrammed devices can be ordered in customer-requested frequencies. The DS1077L is available in 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. 1 of 21 011006 DS1077L BLOCK DIAGRAM DS1077L Figure 1 CONTROL SEL0 LOGIC EN0 INTERNAL CTRL0 (TABLE 1) OSCILLATOR PDN 0 Select Enable MCLK DIV1 Power-Down 0M1 0M0 MUX P0 PRESCALER OUT0 1M1 (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