DS1077 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1077

EconOscillator/Divider

Dallas Semiconductor -> Maxim Integrated 

www.maxim-ic.com

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

DS1077

EconOscillator/Divider

PIN ASSIGNMENT

OUT1 1

OUT0 2

VVCDCD

3

GND 4

8 SCL

7 SDA

6 CTRL1

5 CTRL0

150mil SO

118mil µSOP Package

PIN DESCRIPTION

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

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.

EconOscillator is a trademark of Dallas Semiconductor.

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