DS1077U-120+ Datasheet DS1077U-66+, DS1077U-100+, DS1077U-120+ | P1-P3

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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

SCL

CTRL0

CTRL1

SDA

PIN DESCRIPTION

OUT1 - Main Oscillator Output

OUT0 - Reference Output

- 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/Divide

www.maxim-ic.com

150mil SO

118mil µSOP Package

EconOscillator is a trademark of Dallas Semiconductor.

DS1077

2 of 21

BLOCK DIAGRAM 1077 Figure1

PROGRAMMABLE

“N” DIVIDER

CONTROL

LOGIC

(TABLE 1)

CONTROL

LOGIC

2-WIRE

INTERFACE

DIV1

0M1

0M0

1M1

1M0

EN0

SEL0

PDN0

PDN1

CONTROL

REGISTERS

SCL SDA

INTERNAL

OSCILLATOR

P0 PRESCALER

(M DIVIDER)

P1 PRESCALER

(

M DIVIDER

)

0M0 0M1

1M0 1M1

MUX

PDN0

EN0

SEL0

Power-Down

OUT0

CTRL0

Enable

Select

OUT1

DIV1

CTRL1

PDN1

(TABLE 2)

MCLK

Power-Down

Enable

DS1077

3 of 21

OVERVIEW

A block diagram of the DS1077 is shown in Figure 1. The DS1077 consists of four major components:

1) Internal Master Oscillator, 2) Prescalers, 3) Programmable Divider, and 4) Control Registers.

The internal oscillator is factory-trimmed to provide a master frequency (Master CLK) that can be routed

directly to the outputs (OUT0 & OUT1) or through separate prescalers (P0 & P1). OUT1 can also be

routed through an additional divider (N).

The Prescaler (P0) divides the Master Clock by 1, 2, 4, or 8 to be routed directly to the OUT0 pin.

The Prescaler (P1) divides the Master Clock by 1, 2, 4, or 8, which can be routed directly to the OUT1 pin

or to the Divider (N) input, which is then routed to the OUT1 pin.

The Programmable Divider (N) divides the Prescaler Output (P1) by any number selected between 2 and

1025 to provide the Main Output (OUT1) or it can be bypassed altogether by use of the DIV1 register bit.

The value of N is stored in the DIV register.

The Control Registers are user-programmable through a 2-wire serial interface to determine operating

frequency (values of P0, P1, & N) and modes of operation. The register values are stored in EEPROM

and therefore only need to be programmed to alter frequencies and operating modes.

PIN DESCRIPTIONS

Output 1 (OUT1)—This pin is the main oscillator output; its frequency is determined by the control

Output 0 (OUT0)—A reference output, OUT0, is taken from the output of the reference select Mux. Its

frequency is determined by the control register settings for CTRL0 and values of Prescaler P0 (mode bits

0M1 & 0M0) (see Table 1).

Control Pin 0 (CTRL0)—A multifunctional input pin that can be selected as a MUX SELECT,

OUTPUT ENABLE and/or a POWER-DOWN. Its function is determined by the user-programmable

control register values EN0, SEL0, and PDN0 (see Table 1).

Control Pin 1 (CTRL1)—A multifunctional input pin that can be selected as a OUTPUT ENABLE

and/or a POWER-DOWN. Its function is determined by the user-programmable control register value of

PDN1 (see Table 2).

Serial Data Input/Output (SDA)—Input/Output pin for the 2-wire serial interface used for data transfer.

Serial Clock Input (SCL)—Input pin for the 2-wire serial interface used to synchronize data movement

on the serial interface.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21

DS1077U-120+

Mfr. #:

Buy DS1077U-120+

Manufacturer:

Maxim Integrated

Description:

Clock Generators & Support Products EconOscillator/Dvdr 120MHz 150mil 2-Wire

Lifecycle:

New from this manufacturer.

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DS1077U-120+

DS1077U-120+

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