Symbol

Parameter

Conditions

Min

Typ

Max

Units

MICROWIRE INTERFACE TIMING

t

CS

Data to Clock Set Up Time

50

ns

t

CH

Data to Clock Hold Time

10

ns

t

CWH

Clock Pulse Width High

50

ns

t

CWL

Clock Pulse Width Low

50

ns

t

ES

Clock to Latch Enable Set Up Time

50

ns

t

EW

Latch Enable Pulse Width

50

ns

Note 4: In power down mode, set DATA, CLK and LE pins to 0 V (GND).

Note 5: The reference frequency must also be programmed using the OSC_FREQ control bit. For other reference frequencies, please contact National

Semiconductor.

Note 6: For other frequency ranges, please contact National Semiconductor.

Note 7: Lock time is defined as the time difference between the beginning of the frequency transition and the point at which the frequency remains within +/- 1 kHz

of the final frequency.

Note 8: Frequencies other that the default value can be programmed using Words R4 and R5. See Programming Description for details.

Serial Data Input Timing

20067204

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