DS1073 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

Номер в каталоге

Компоненты Описание

Список матч

DS1073

3V EconOscillator/Divider

Dallas Semiconductor -> Maxim Integrated 

DS1073

PIN DESCRIPTIONS

IN/OUT Pin (I/O): This pin is the main oscillator output, with a frequency determined by clock

reference, M and N dividers. Except in programming mode this pin is always an output. In programming

mode this pin is an input and output.

External Oscillator Input (OSCIN): This pin can be used to supply an external reference frequency to

the device.

Crystal Oscillator Connection (XTAL): A crystal can be connected between this pin and OSCIN to

provide an alternative frequency reference. The crystal must be used in fundamental mode. If a crystal is

not used this pin should be left open.

Output Enable Function (OE pin): The DS1073 also features a “synchronous” output enable. When

OE is at a high logic level the oscillator free runs. When this pin is taken low OUT is held low,

immediately if OUT is already low, or at its next high-to-low transition if OUT is high. This prevents any

possible truncation of the output pulse width when the enable is used. While the output is disabled the

master oscillator continues to run (producing an output at OUT0, if the EN0 bit = 0) but the internal

counters (/N) are reset. This results in a constant phase relationship between OE’s return to a high level

and the resulting OUT signal. When the enable is released OUT will make its first transition within one

to two clock periods of the master clock.

Power-Down/Select Function ( PDN / SELX pin): The Power-Down/Select ( PDN / SELX ) pin has a user-

selectable function determined by one bit (PDN bit) of the user-programmable memory. According to

which function is selected, this pin will be referred to as PDN or SELX .

If the Power-Down function is selected (PDN bit = 1) a low logic level on this pin can be used to make

the device stop oscillating (active low) and go into a reduced power consumption state. The “Enabling

Sequencer” circuitry will first disable OUT in the same way as when OE is used. Next OUT0 will be

disabled in a similar fashion. Finally the oscillator circuitry will be disabled. In this mode both outputs

will go into a high-impedance state.

The power consumption in the power-down state is much less than if OE is used because the internal

oscillator (if used) is completely powered down. Even if an external reference or a crystal is used all of

the on-chip buffers are powered down to minimize current drain. Consequently the device will take

considerably longer to recover (i.e., achieve stable oscillation) from a power-down condition than if the

OE is used.

If the Select function is chosen (PDN bit = 0) this pin can be used to switch between the internal

oscillator and an external reference (or crystal) on the fly. When this mode is chosen the E/ I select bit is

overridden, a high logic level on SELX will select the internal oscillator, a low logic level will select the

external reference (or crystal oscillator).

Reference Output (OUT0 pin): A reference output, OUT0, is also available from the output of the

reference select mux. This output is especially useful as a buffered output of a crystal defined master

frequency. OUT0 is unaffected by the OE pin, but is disabled in a glitchless fashion if the device is

powered down. If this output is not required it can be permanently disabled by setting the EN0 bit to 1,

and there will be a corresponding reduction in overall power consumption.

3 of 18

Share Link: