DS1077
EconOscillator/Divider
www.maxim-ic.com
FEATURES
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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
PIN ASSIGNMENT
OUT1
OUT0
V
DD
V
CC
GND
1
2
3
4
8
7
6
5
SCL
SDA
CTRL1
CTRL0
150mil SO
118mil µSOP Package
PIN DESCRIPTION
OUT1
OUT0
V
CC
GND
CTRL1
CTRL0
SDA
SCL
STANDARD FREQUENCY OPTION
Note: x denotes package option
DS1077x-133 133.333MHz to
DS1077x-125 125.000MHz to
DS1077x-120 120.000MHz to
DS1077x-100 100.000MHz to
DS1077x-66
66.666MHz to
16.2kHz
15.2kHz
14.6kHz
12.2kHz
8.1kHz
- Main Oscillator Output
- Reference Output
- Power Supply Voltage
- Ground
- Control Pin for OUT1
- Control Pin for OUT0
- 2-Wire Serial Data
Input/Output
- 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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022703
DALLAS [ DALLAS SEMICONDUCTOR ]
