MICRF405YML datasheet(8/46 Pages) MICREL

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Micrel

MICRF405

April 2006

M9999-041906

(408) 955-1690

Programming Interface Timing

Figure 1 and Table 2 shows the timing specification

for the 3-wire serial programming interface.

Figure 1. Programming Interface Timing.

Values

Symbol

Parameter

Min.

Typ.

Max.

Units

Tper

Min. period of SCK

Thigh

Min. high time of SCK

Tlow

Min. low time of SCK

Tfall

Max. time of falling edge of SCK

µs

Trise

Max. time of rising edge of SCK

µs

Tsenf

Min. time of falling edge of SEN to falling edge of SCK

Tsenr

Min. delay from rising edge of SEN to rising edge of SCK

Twrite

Min. delay from valid SIO to falling edge of SCK during a

write operation

Tread

Min. delay from rising edge of SCK to valid SIO during a read

operation (assuming load capacitance of SIO is 25pF)

Trdy

Min. delay from falling edge of SCK (last bit of byte into data

buffer) to falling edge of RDY

Thigh

Min. duration of a SEN high pulse

(Fphd is the phase detector frequency)

1/Fphd

Time from power up to first falling edge of SEN

3.5

Table 2. Timing Specification for the 3-wire Programming Interface.

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