DS1077LU-40 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1077LU-40

3V EconOscillator/Divider

Dallas Semiconductor -> Maxim Integrated 

DS1077L

3V EconOscillator/Divider

www.maxim-ic.com

FEATURES

§ Processor-controlled or stand-alone solid-

state oscillator

§ Frequency changes on the fly

§ Dual, low-jitter, synchronous fixed-

frequency outputs

§ 2-wire serial interface

§ Frequency outputs 4.87kHz to 66.666MHz

±1.25% variation over temperature and

voltage

§ ±0.5% initial tolerance

§ Nonvolatile frequency settings

§ Single 2.7V to 3.6V supply

§ No external components

§ Power-down mode

§ Synchronous output gating

STANDARD FREQUENCY OPTION

Note: x denotes package option

DS1077Lx-40 40.000MHz to 4.87kHz

DS1077Lx-50 50.000MHz to 6.09kHz

DS1077Lx-60 60.000MHz to 7.32kHz

DS1077Lx-66 66.666MHz to 8.13kHz

Contact the factory for the availability of

additional frequencies.

PIN ASSIGNMENTS

OUT1 1

OUT0 2

VCC 3

GND 4

8 SCL

7 SDA

6 CTRL1

5 CTRL0

150mil SO

118mil µSOP*

PIN DESCRIPTIONS

OUT1

- Main Oscillator Output

OUT0

- Reference Output

VCC

GND

- Power-Supply Voltage

- 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

DS1077LZ-XXX 8-pin 150mil SO

DS1077LU-XXX* 8-pin 118mil µSOP

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 µSOP packages, allowing the generation of a clock signal easily,

economically, and using minimal board area. Chip-scale packaging is also available on request.

*Future product. Contact factory for availability.

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