ML5805
SERIAL BUS CONTROL: EN, DATA, CLK
A 3-wire serial interface is used for programming the ML5805 configuration registers, which control device mode of
operation, pin functions, PLL and reference dividers, internal test modes and filter alignment. Data words are entered
beginning with the MSB. The 24 bit configuration register word consists of 5 bit address and 16 bit data fields.. When
the address field has been decoded the destination register is loaded on the rising edge of EN. Note: Providing less
than 24 bits of data will result in unpredictable behavior when EN goes high.
Data and clock signals are ignored when EN is high. When EN is low, data on the DATA pin is clocked into a shift
register by rising edges on the CLK pin. The information is loaded into the addressed latch when EN returns high. This
serial interface bus is an industry standard bus commonly found on PLL devices. It can be efficiently programmed by
either byte or 24-bit word oriented serial bus hardware. The data latches are implemented in CMOS and use minimal
power when the bus is inactive (see Figure 5 and Table 3).
tf
ts
tck
th
tr
tl
CLK
Data
tse
MSB
tew
EN
Figure 5: Serial Bus Timing Diagram
SYMBOL PARAMETER
BUS CLOCK (CLK)
MIN MAX UNITS
Clock input rise time (Note 1)
tr
15
15
ns
ns
ns
Clock input fall time (Note 1)
Clock period
tf
tck
50
ENABLE (EN)
tew
tl
Minimum pulse width
200
15
ns
ns
ns
Delay from last clock rising edge to rise of EN
Enable set up time to ignore next rising clock
tse
15
BUS DATA (DATA)
ts
Data to clock set up time
Data to clock hold time
15
15
ns
ns
th
Table 3: Serial Bus Timing Specifications
Note 1: Serial I/O clock maximum rise and fall times are based on the minimum clock period. Longer rise and fall times can
be accommodated for slower clocks provided the rise and fall times remain less than 20% of the clock period and all set up
and hold time minimums are met with respect to the CMOS switching points (VIL MAX and VIH MIN). The serial I/O clock rise
and fall times are limited to an absolute maximum of 100ns.
RF MICRO DEVICES®, RFMD®, OPTIMUM TECHNOLOGY MATCHING®, ENABLING WIRELESS CONNECTIVITY™, POWERSTAR®, POLARIS™ TOTAL RADIO™ ULTIMATEBLUE™ AND FASTWAVE™ ARE TRADEMARKS OF RFMD, LLC. BLUETOOTH IS A TRADEMARK OWNED BY
BLUETOOTH SIG, INC., U.S.A. AND LICENSED FOR USE BY RFMD. ALL OTHER TRADE NAMES, TRADEMARKS AND REGISTERED TRADEMARKS ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS. ©2006, RF MICRO DEVICES, INC.
PRELIMINARY DATA SHEET
APRIL 2008
EDS-106041 REV P01
7628 THORNDIKE ROAD, GREENSBORO, NC 27409-9421 · FOR SALES OR TECHNICAL
REV A1 DS071026 SUPPORT, CONTACT RFMD AT (+1) 336-678-5570 OR SALES-SUPPORT@RFMD.COM
19
RFMD [ RF MICRO DEVICES ]
