ds1075 ETC-unknow, ds1075 Datasheet - Page 8

• Manufacturer Part Number: ds1075
• Description: Econoscillator/divider
• Manufacturer: ETC-unknow

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
2. When OUT is low, switch OUT to high–impedance
Figure 9
POWER–ON RESET
When power is initially applied to the device supply pin,
a power–on reset sequence is executed, similar to that
which occurs when the device is restored from a power–
down condition. This sequence comprises two stages,
first a conventional POR to initialize all on–chip circuitry,
followed by a stabilization period to allow the oscillator
to reach a stable frequency before enabling the outputs:
1. Initialize internal circuitry.
2. Enable internal oscillator and/or OSCIN buffer.
DS1075
101697 8/16
used) and reset N counters.
state.
OUT0
PDN
OUT
t
t
t
t
LOW
LOW
SEI
SEI
(min) = t
(max) = 3t
(min) = t
(max) = 3t
I
/2
I
/2
I
/2 + t
I
t
/2 + t
dis
Ehigh
Elow
t
pdn
Hi–Z
Hi–Z
3. Disable MCLK (and OUT0 if EN0 bit = 0), switch
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
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.
3. Set M and N to maximum values.
4. Wait approximately 256 cycles of MCLK for the
5. Load M and N programmed values from
6. Enable OUT0 (assuming EN0=0).
7. Enable OUT.
OUT0 to high impedance state.
stabilize.
oscillator to stabilize.
EEPROM.
t
stab