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PDF DS1065 Data sheet ( Hoja de datos )
| Número de pieza | DS1065 | |
| Descripción | EconOscillator/Divider | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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PRELIMINARY
DS1065
EconOscillator/Divider
www.dalsemi.com
FEATURES
§ 30 kHz to 100 MHz output frequencies
§ User-programmable on-chip dividers (from 1-
513)
§ User-programmable on-chip prescaler (1, 2,
4)
§ No external components
§ ±0.5% initial tolerance
§ ±3% variation over temperature and voltage
§ Single 5V supply
FREQUENCY OPTIONS
Part No.
Max O/P freq.
DS1065-100
100.000 MHz
DS1065-80
80.000 MHz
DS1065-66
66.667 MHz
DS1065-60
60.000 MHz
PIN ASSIGNMENT
Dallas
DS1065
12 3
12 3
BOTTOM
VIEW
PIN DESCRIPTION
TO-92
1 I/O
- Input/Output
2 VCC
3 GND
- Power Supply
- Ground
DESCRIPTION
The DS1065 is a fixed frequency oscillator requiring no external components for operation. Numerous
operating frequencies are possible in the range of approximately 30 kHz to 100 MHz through the use of
an on-chip programmable prescaler and divider.
The DS1065 features a master oscillator followed by a prescaler and then a programmable divider. The
prescaler and programmable divider are user-programmable with the desired values being stored in
nonvolatile memory. This allows the user to buy an off the shelf component and program it on site prior
to board production. Design changes can be accommodated easily by simply programming different
values into the device (or reprogramming previously programmed devices). The DS1065 is shipped from
the factory configured for half the maximum operating frequency. Contact the factory for specially
programmed devices.
The DS1065 features a dual-purpose Input/Output pin. If the device is powered up in Program mode this
pin can be used to input serial data to the on-chip registers. After a write command this data is stored in
nonvolatile memory. When the chip is subsequently powered up in operating mode these values are
automatically restored to the on-chip registers and the Input/Output pin becomes the oscillator output.
The DS1065 is available in TO-92 (3 LEAD) package, allowing the generation of a clock signal easily,
economically and using minimal board area.
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DS1065
PROGRAMMING
Normally when power is applied to the supply voltage pin the device will enter its normal operating
mode, following the power-on reset sequence. However the device can be made to enter a programming
mode if a pullup resistor is connected between IN/OUT and the supply voltage pin prior to power-up.
The method used for programming is a variant of the 1-WireTM protocol used on a number of Dallas
Semiconductor products.
HARDWARE
The hardware configuration is shown in the diagram. A bus master is used to read and write data to the
DS1065’s internal registers. The bus master may have either an open-drain or TTL-type architecture.
Figure 11
Programming mode is entered by simply powering up the DS1065 with a pullup of approximately 5kW.
This will pull the IN/OUT pin above VIH on power-up and initiate the programming mode, causing the
DS1065 to internally release the IN/OUT pin after t STAB and allow the pullup resistor to pull up the pin to
the supply rail and await the Master Tx Reset pulse (see diagram).
NOTE:
To ensure normal operation any external pullup applied to IN/OUT must be greater than 20 kW in value.
This will cause the IN/OUT pin to remain below VIH on power-up, resulting in normal operation at the
end of tSTAB.
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