DS1075 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1075

EconOscillator/Divider

Dallas Semiconductor -> Maxim Integrated 

DS1075

edge of SELX and the first rising edge of the externally derived clock is t SIE . Approximate maximum

and minimum values of these parameters are:

tLOW (min) = tI/2

tLOW (max) = 3tI/2 + tElow

tSIE (min) = tI/2

tSIE (max) = 3 tI/2 + tEhigh

NOTE:

In each case there will be a small additional delay due to internal propagation delays.

POWER-DOWN CONTROL

If the PDN bit is set to “1”, the PDN / SELX pin can be used to power-down the device. If PDN is high

the device will run normally.

POWER-DOWN

If PDN is taken low a power-down sequence is initiated. The “Enabling Sequencer” is used to execute

events in the following sequence:

1. Disable OUT (same sequence as when OE is used) and reset N counters.

2. When OUT is low, switch OUT to high-impedance state.

3. Disable MCLK (and OUT0 if EN0 bit = 0), switch OUT0 to high impedance state.

4. Disable internal oscillator and OSCIN buffer.

POWER-UP

When PDN is taken to a high level the following power-up sequence occurs:

1. Enable internal oscillator and/or OSCIN buffer.

2. Set M and N to maximum values.

3. Wait approximately 256 cycles of MCLK for it to stabilize.

4. Reset M and N to programmed values.

5. Enable OUT0 (assuming EN0 bit = 0).

6. Enable OUT.

Steps 2 through 4 exist to allow the oscillator to stabilize before enabling the outputs.

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