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STUW81300 Datasheet(PDF) 34 Page - STMicroelectronics

No. de pieza STUW81300
Descripción Electrónicos  Wideband RF/microwave PLL fractional/integer frequency synthesizer with integrated VCOs and LDOs
PDF  63 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STUW81300 Datasheet(HTML) 34 Page - STMicroelectronics

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Circuit description
STuW81300
34/63
DS11314 Rev 7
The Data bits are stored in the internal shift register on the rising edge of SCK.
The first bit, CO is used for mode selection (0=Write Operation, 1=Read Operation). The
bits A[3:0] represent the register address, and D[26:0] are the data bits.
In some registers, the first data bit, D26, is used (when set to ‘1’) for double-buffering
purposes. In this case the register content is stored in a temporary buffer and is transferred
to the internal register once a write operation is done on the master register ST0.
Figure 25. SPI timing diagram
MsV43275V1
Tsetup Thold
SDI
LD_SDO
SCK
LE
MSB
MSB - 1
LSB
Tcd
Tdi
Tck
Tec
Table 9. SPI timings
Parameter
Comments
Min
Typ
Max
Unit
Tsetup
Data to clock setup time
4-
-
ns
Thold
Data to clock hold time
1-
-
ns
Tck
Clock cycle period
20
-
-
ns
Tdi
Disable pulse width
4-
-
ns
Tcd
Clock-to-disable time
1-
-
ns
Tec
Enable-to-clock time
3-
-
ns



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