DS1087L Dallas Semiconductor, DS1087L Datasheet
DS1087L
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DS1087L Summary of contents
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... Rev 1; 11/03 3.3V Spread-Spectrum EconOscillator General Description The DS1087L is a clock generator that produces a spread-spectrum (dithered) square-wave output of fre- quencies from 130kHz to 66.6MHz. The DS1087L is shipped from the factory programmed at a specific fre- quency and spread-spectrum percentage. The user still has access to an internal frequency divider, selectable ...
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Spread-Spectrum EconOscillator ABSOLUTE MAXIMUM RATINGS Voltage Range on V Relative to Ground ..........-0.5V to +6.0V CC Voltage Range on SPRD, PDN, OE, SDA, SCL Relative to Ground* ................................-0. Operating Temperature Range ...........................-40°C to +85°C *This voltage must ...
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Spread-Spectrum EconOscillator MASTER OSCILLATOR CHARACTERISTICS (V = 2.7V to 3.6V -40°C to +85°C PARAMETER SYMBOL Master Oscillator Range Available Master Oscillator Frequency Tolerance Voltage Frequency Variation Temperature Frequency Variation Temperature Frequency Variation Dither Frequency Range ...
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Spread-Spectrum EconOscillator AC ELECTRICAL CHARACTERISTICS—2-WIRE INTERFACE (V = 2.7V to 3.6V 0°C to +70°C PARAMETER SYMBOL SCL Clock Frequency Bus Free Time Between a STOP and START Condition Hold Time (repeated) START t HD:STA Condition ...
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Spread-Spectrum EconOscillator Note 1: All voltages are referenced to ground. Note 2: This is the absolute accuracy of the master oscillator frequency at the default settings. Note 3: This is the change that is observed in master oscillator frequency ...
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Spread-Spectrum EconOscillator (V = 3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. PRESCALER 3.3V CC OUPUT UNLOADED -40°C, +25°C, +85° 100 PRESCALER (DECIMAL) FREQUENCY ...
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... Serial Clock. This pin is used to clock data into and out of the device SDA INTERFACE SCL PDN OE SPRD GND Figure 1. Functional Diagram FUNCTION EEPROM CONTROL REGISTERS 2-WIRE ADDR PRESCALER FACTORY-PROGRAMMED DITHER CONTROL TRIANGLE WAVE GENERATOR DITHER SIGNAL _____________________________________________________________________ Pin Description DS1087L OSCILLATOR MASTER OSCILLATOR OUTPUT PRESCALER 4...256 OUT 7 ...
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... X = Don’t care; read as one. 1 Detailed Description A block diagram of the DS1087L is shown in Output Frequency The internal master oscillator can generate a square wave with a frequency range of 33.3MHz to 66.6MHz. The master oscillator frequency and output frequency are factory programmed, although the user can use the ...
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... A master device that generates the serial clock (SCL), controls the bus access, and gener- ates the START and STOP conditions must control the bus. The DS1087L operates as a slave on the 2-wire bus. Connections to the bus are made through the open-drain I/O lines SDA and SCL. ...
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... However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmitted on SDA by the DS1087L while the serial clock is input on SCL. START and STOP conditions are recognized as the beginning and end of a serial transfer. ...
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... ACK ACK START decoupling applications. These capacitors should be placed as close to the V SCL and SDA cannot be left floating even in stand- alone mode. If the DS1087L never needs to be pro- grammed in-circuit, including during production testing, SDA and SCL can be wired high. ____________________________________________________________________ t SP ...
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... XTL1/OSC1 XTL2/OSC2 2-WIRE INTERFACE V CC *SDA AND SCL CAN BE CONNECTED DIRECTLY HIGH IF THE DS1087L NEVER NEEDS TO BE PROGRAMMED IN-CIRCUIT, INCLUDING DURING PRODUCTION TESTING. For the latest package outline information www.maxim-ic.com/DallasPackInfo Printed USA is a registered trademark of Maxim Integrated Products. Typical Operating Circuits ...