DS8908B Datasheet, PDF (3/10 Pages) National Semiconductor (TI) – AM/FM Digital Phase-Locked Loop Frequency Synthesizer

AC Electrical Characteristics V_CC 5V T_A 25 C t_r ^s 10 ns t_f ^s 10 ns (Continued)
Symbol
Parameter
Conditions
Min Typ Max Units
t_EN0
Minimum ENABLE Low
Pulse Width
375 750
ns
t_CLKEN0
Minimum Time before ENABLE
Goes Low That CLOCK Must
Be Low
b50 0
ns
t_EN0CLK
Minimum Time after ENABLE
Goes Low That CLOCK Must
Remain Low
275 550
ns
t_CLKEN1
Minimum Time before ENABLE
Goes High That Last Positive
CLOCK Edge May Occur
300 600
ns
t_EN1CLK
Minimum Time after ENABLE
Goes High before an Unused
Positive CLOCK Edge May Occur
175 350
ns
t_CLKH
Minimum CLOCK High
Pulse Width
275 550
ns
t_CLKL
Minimum CLOCK Low
Pulse Width
400 800
ns
t_DS
Minimum DATA Set-Up Time
Minimum Time before CLOCK
That DATA Must Be Valid
150 300
ns
t_DH
Minimum DATA Hold Time
Minimum Time after CLOCK
That DATA Must Remain Valid
400 800
ns
Note 1 ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed Except for ‘‘Operating Temperature Range’’
they are not meant to imply that the devices should be operated at these limits The table of ‘‘Electrical Characteristics’’ provides conditions for actual device
operation
Note 2 Unless otherwise specified min max limits apply across the 40 C to a85 C temperature range for the DS8908B
Note 3 All currents into device pins shown as positive out of device pins as negative all voltage referenced to ground unless otherwise noted All values shown as
max or min on absolute value basis
Schematic Diagrams (DS8908B AM FM PLL Typical Input Output Schematics)
TL F 5111 2
3
TL F 5111 4
TL F 5111 3