Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsDS1077U-66+

1 of 21 011006

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.

Summary of content (21 pages)

PAGE 1
DS1077 EconOscillator/Divider www.maxim-ic.com PIN ASSIGNMENT FEATURES § § § § § § § § § § § § Processor-controlled or standalone solidstate 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.
PAGE 2
DS1077 BLOCK DIAGRAM 1077 Figure1 CONTROL LOGIC (TABLE 1) SEL0 EN0 PDN0 INTERNAL OSCILLATOR Enable Select DIV1 MCLK Power-Down 0M1 0M0 1M1 CTRL0 P0 PRESCALER (M DIVIDER) MUX OUT0 1M0 EN0 SEL0 PDN0 0M1 0M0 DIV1 PDN1 CONTROL REGISTERS PROGRAMMABLE “N” DIVIDER P1 PRESCALER (M DIVIDER) 2-WIRE INTERFACE Power-Down 1M1 1M0 PDN1 SDA Enable CONTROL LOGIC (TABLE 2) SCL 2 of 21 OUT1 CTRL1
PAGE 3
DS1077 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).
PAGE 4
DS1077 DEVICE MODE USING OUT0 Table 1 EN0 (BIT) SEL0 (BIT) PDN0 (BIT) 0 0 0 CTRL0 (PIN) OUT0 (PIN) CTRL0 FUNCTION DEVICE MODE 1 HI-Z POWER-DOWN 0 HI-Z POWERDOWN* ACTIVE 1 MCLK/M MUX SELECT ACTIVE 0 MCLK 1 HI-Z OUTPUT 1 0 0 ACTIVE ENABLE 0 MCLK 1 HI-Z OUTPUT 1 1 0 ACTIVE** ENABLE 0 MCLK/M 1 HI-Z POWER-DOWN POWERX 0 1 DOWN 0 MCLK ACTIVE 1 HI-Z POWER-DOWN POWERX 1 1 DOWN 0 MCLK/M ACTIVE *This mode is for applications where OUT0 is not used, but CTRL0 is used as a device shutdown.
PAGE 5
DS1077 SHUTDOWN CONTROL WITH PDN0 AND PDN1 Table 3 PDN0 PDN1 SHUTDOWN CONTROL (BIT) (BIT) 0 0 NONE* 0 1 CTRL1 1 0 CTRL0 1 1 CTRL0 OR CTRL1 *CTRL0 performs a power-down if SEL0 and EN0 are both 0 (see Table 1). 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).
PAGE 6
DS1077 EN0 (bit) (Default EN0 = 1) 1) If EN0 = 1 and PDN0 = 0 the CTRL0 pin functions as an Output Enable for OUT0, the frequency of the output being determined by the SEL0 bit. 2) If PDN0 = 1, the EN0 bit is ignored, CTRL0 will function as a power-down, and output OUT0 will always be enabled on power-up, its frequency being determined by the SEL0 bit. 3) If EN0 = 0 the function of CTRL0 is determined by the SEL0 and PDN0 bits (see Table 1).
PAGE 7
DS1077 DIV WORD MSB N9 N8 N7 N6 N5 N4 first data byte N3 LSB MSB N2 N1 N0 X X X X second data byte X LSB X N These ten bits determine the value of the programmable divider (N). The range of divisor values is from 2 to 1025, and is equal to the programmed value of N plus 2 (see Table 5).
PAGE 8
DS1077 2-WIRE SERIAL DATA BUS The DS1077 supports a bidirectional 2-wire bus and data transmission protocol. A device that sends data onto the bus is defined as a transmitter, and a device receiving data as a receiver. The device that controls the message is called a “master.” The devices that are controlled by the master are “slaves.” The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions.
PAGE 9
DS1077 DATA TRANSFER ON 2-WIRE SERIAL BUS Figure 2 SDA MSB slave address R/W direction bit acknowledgement signal from receiver acknowledgement signal from receiver SCL 1 START CONDITION 2 6 7 8 9 1 2 3-8 ACK 8 9 ACK repeated if more bytes are transferred STOP CONDITION OR REPEATED START CONDITION Figure 2 details how data transfer is accomplished on the 2-wire bus.
PAGE 10
DS1077 SLAVE ADDRESS A control byte is the first byte received following the START condition from the master device. The control byte consists of a 4-bit control code; for the DS1077, this is set as 1011 binary for read and write operations. The next three bits of the control byte are the device select bits (A2, A1, A0) and can be written to the EEPROM. They are used by the master device to select which of eight devices are to be accessed.
PAGE 11
DS1077 2-WIRE SERIAL COMMUNICATION WITH DS1077 Figure 3 Send a “Standalone” Command SCL SDA S 1 Start 0 1 1 A2 A1 A0 W Address Byte A C7 C6 C5 C4 C3 C2 C1 C0 DS1077 ACK Command Byte A P DS1077 Stop ACK Write MSB of a Two-Byte Register SCL SDA S 1 0 Start 1 1 A2 A1 A0 W Address Byte A C7 C6 C5 C4 C3 C2 C1 C0 DS1077 ACK Command Byte A D7 D6 D5 D4 D3 D2 D1 D0 DS1077 ACK MSByte A P DS1077 Stop ACK Write to a Two-Byte Register SCL SDA S 1 0 Start 1 1 A2 A1 A0 W Address B
PAGE 12
DS1077 2-WIRE SERIAL COMMUNICATION WITH DS1077 Figure 3 (continued) Read Single Byte Register or MSB from a Two-Byte Register SCL SDA S 1 0 Start 1 1 A2 A1 A0 W Control Byte A C7 C6 C5 C4 C3 C2 C1 C0 DS1077 ACK Command Byte A R 1 0 1 1 A2 A1 A0 Rd DS1077 Repeated Control Byte ACK Start A D7 D6 D5 D4 D3 D2 D1 D0 DS1077 ACK MSByte N Master Stop NACK Read from a Two-Byte Register SCL SDA S 1 0 Start 1 1 A2 A1 A0 W Control Byte A C7 C6 C5 C4 C3 C2 C1 C0 DS1077 ACK Comman
PAGE 13
DS1077 COMMAND SET Data and control information is read from and written to the DS1077 in the format shown in Figure 3. To write to the DS1077, the master will issue the slave address of the DS1077 and the R/ W bit will be set to 0. After receiving an acknowledge, the bus master provides a command protocol. After receiving this protocol, the DS1077 will issue an acknowledge, and then the master may send data to the DS1077.
PAGE 14
DS1077 ABSOLUTE MAXIMUM RATINGS Voltage on Any Pin Relative to Ground Operating Temperature Range Programming Temperature Range Storage Temperature Range Soldering Temperature -0.5V to 6.
PAGE 15
DS1077 AC ELECTRICAL CHARACTERISTICS PARAMETER Output Frequency Tolerance Over Temperature SYMBOL ∆fO Output Frequency Tolerance Over Voltage ∆fO Combined Freq. Variation ∆fO Output Frequency Min Output Frequency Max fOUT (TA = -40°C to +85°C; VCC = 5V ±5%) CONDITION MIN TYP MAX VCC = 5V, 25°C -0.5 0 +0.5 VCC = 5V, 70°C -0.5 0 +0.5 VCC = 5V, -3.3 -40°C to +25°C VCC = 5V, -1.4 +25°C to +85°C VCC = 4.75V, -1.0 25°C VCC = 5.25V, 25°C Over Temp (0°C to +70°C) -1.65 & Voltage 8.13 +2.
PAGE 16
DS1077 AC ELECTRICAL CHARACTERISTICS: 2-WIRE INTERFACE (-40°C to +85°C; VCC= 5V±5%) PARAMETER SYMBOL CONDITION SCL Clock Frequency fSCL Bus Free Time Between a STOP and START Condition Hold Time (Repeated) START Condition LOW Period of SCL tBUF Fast Mode Standard Mode Fast Mode Standard Mode tHD:STA tLOW HIGH Period of SCL tHIGH Set-Up Time for a Repeated START Data Hold Time tSU:STA tHD:DAT Data Set-Up Time tSU:DAT Rise Time of Both SDA and SCL Signals Fall Time of Both SDA and SCL Signals
PAGE 17
DS1077 8) A fast mode device can be used in a standard mode system, but the requirement tSU:DAT>250ns must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line tR MAX + tSU:DAT = 1000ns + 250ns = 1250ns before the SCL line is released. 9) CB is the total capacitance of one bus line in pF.
PAGE 18
DS1077 TYPICAL OPERATING CHARACTERISTICS (VCC = 5.0V, T = +25°C, unless otherwise specified) SUPPLY CURRENT vs. VOLTAGE 45.00 40.00 CURRENT (mA) 35.00 30.00 25.00 20.00 15.00 DS1077-133 10.00 DS1077-100 5.00 DS1077-66 0.00 4.5 4.7 4.9 5.1 5.3 5.5 VOLTAGE (V) SUPPLY CURRENT vs. DIVISOR (N) DS1077-133 34 32 CURRENT (mA) 30 28 26 24 4.75V 5.0V 22 5.
PAGE 19
DS1077 TYPICAL OPERATING CHARACTERISTICS (continued) (VCC = 5.0V, T = +25°C, unless otherwise specified) SUPPLY CURRENT vs. DIVISOR (N) 35 30 CURRENT (mA) 25 20 15 10 DS1077-133 DS1077-100 5 DS1077-66 0 0 200 400 600 800 1000 DIVISOR (N) SUPPLY CURRENT vs.
PAGE 20
DS1077 TYPICAL OPERATING CHARACTERISTICS (continued) (VCC = 5.0V, T = +25°C, unless otherwise specified) TEMPCO 2 1.5 % Change from 25C 1 0.5 0 -0.5 DS1077-133 DS1077-100 -1 DS1077-66 MUX=3040h DIV=0000h -1.5 -2 0 10 20 30 40 50 60 70 TEMPERAT URE (C) VOLTCO 2.00 % CHANGE FROM 5V 1.50 1.00 0.50 0.00 -0.50 DS1077-133 -1.00 -1.50 DS1077-100 MUX=3040h DIV=0000h DS1077-66 -2.00 4.75 4.85 4.95 5.05 VOLTAGE (V) 20 of 21 5.15 5.
PAGE 21
DS1077 TYPICAL OPERATING CHARACTERISTICS (continued) (VCC = 5.0V, T = +25°C, unless otherwise specified) SHUTDOWN CURRENT vs. TEMPERATURE 4 3.5 CURRENT (µA) 3 2.5 2 1.5 DS1077-66 1 0.