DS1077 Datasheet PDF - Dallas Semiconducotr
| Part Number | DS1077 | |
| Description | EconOscillator/Divider | |
| Manufacturers | Dallas Semiconducotr | |
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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
DS1077
EconOscillator/Divider
PIN ASSIGNMENT
OUT1
OUT0
VVCDCD
GND
1
2
3
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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SHUTDOWN CONTROL WITH PDN0 AND PDN1 Table 3
PDN0 PDN1
SHUTDOWN CONTROL
(BIT)
(BIT)
00
NONE*
01
CTRL1
10
CTRL0
11
CTRL0 OR CTRL1
*CTRL0 performs a power-down if SEL0 and EN0 are both 0 (see Table 1).
DS1077
REGISTER FUNCTIONS
The user programmable registers can be programmed by the user to determine the mode of operation
(MUX), operating frequency (DIV), and bus settings (BUS). Details of how these registers are
programmed can be found in a later section; in this section the functions of the registers are described.
The register settings are nonvolatile, the values being stored automatically or as required in EEPROM
when the registers are programmed via the SDA and SCL pins.
MUX WORD
MSB
LSB MSB
LSB
Name * PDN1 PDN0 SEL0 EN0 0M1 0M0 1M1 1M0 DIV1 - - - - - -
Default 0 0
0 1 1 0 0 0 0 0 x xx x xx
setting
first data byte
second data byte
*This bit must be set to zero.
DIV1 (bit)
This bit allows the output of the Prescaler P1 to be routed directly to the OUT1 pin (DIV1 = 1). The N
divider is bypassed so the programmed value of N is ignored. If DIV1 = 0 (default) the N divider
functions normally.
0M1, 0M0, 1M1, 1M0 (bits)
These bits set the prescalers P0 and P1, to divide by 1, 2, 4, or 8 (see Table 4).
PRESCALER DIVISOR M SETTINGS Table 4
Prescaler
Prescaler
0M1
0M0 P0 Divisor 1M1 1M0 P1 Divisor
“M”
“M”
00
1** 0 0
1**
0 1 2 01 2
1 0 4 10 4
11
**Default Condition
8
11
8
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DS1077 electronic component. |
| Information | Total 21 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DS1077.PDF Datasheet ] | |
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