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DS1077LZ-60

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
1 of 21 011006
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
OUT0
1
2
3
4GN
D
SCL
CTRL0
CTRL1
SDA
8
7
6
5
V
C
C
PIN DESCRIPTIONS
OUT1 - Main Oscillator Output
OUT0 - Reference Output
V
CC
- 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
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.
DS1077L
3V EconOscillator/Divide
r
www.maxim-ic.com
150mil SO
118mil µSOP
DS1077L
2 of 21
BLOCK DIAGRAM DS1077L Figure 1
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
PDN 0
EN0
SEL0
Power-Down
OUT0
CTRL0
Enable
Select
OUT1
DIV1
CTRL1
PDN1
(TABLE 2)
MCLK
Power-Down
Enable
DS1077L
3 of 21
OVERVIEW
A block diagram of the DS1077L is shown in Figure 1. The DS1077L 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 that can be routed 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 N register.
The control registers are user-programmable through a 2-wire serial interface to determine operating
frequency (values of P0, P1, and 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
register settings for the prescaler P1 (mode bits 1M1 and 1M0) and divider N (DIV WORD).
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 and 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. The user-programmable control register values EN0, SEL0, and PDN0
determine its function. (See Table 1.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

DS1077LZ-60

Mfr. #:
Buy DS1077LZ-60
Manufacturer:
Description:
IC OSC DUAL FX FREQ PROG 8-SOIC
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