DS8615 Datasheet, PDF (3/6 Pages) National Semiconductor (TI) – Low Power Dual Modulus Prescalers

AC Electrical Characteristics V_CC 5V g10% T_A b30 C to a70 C
Symbol
Parameter
Conditions
Min Max Units
t_MODULUS
Modulus Set-Up Time
(Notes 4 and 5)
DS8615 DS8616
65
ns
R_IN
AC Input Resistance
V_IN 100 MHz and 50 mVrms
10
kX
C_IN
Input Capacitance
V_IN 100 MHz and 50 mVrms
3
10
pF
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 30 C to a70 C temperature range
Note 3 All currents into device pins are shown as positive out of device pins as negative all voltages referenced to ground unless otherwise noted All values
shown as max or min on absolute value basis
Note 4 t_MODULUS the period of time the modulus control level must be defined prior to the positive transition of the prescaler output to ensure proper modulus
selection
Note 5 See Timing Diagrams
Timing Diagram
TL F 5240 3
The logical state of the modulus control input just prior to the output’s rising edge will determine the modulus ratio of the device
immediately following that rising edge The pulse width difference of N and N a 1 operation occurs during the output HI conditions
Typical Applications
Schematic Diagrams
TL F 5240 4
TL F 5240 5
TL F 5240 6
TL F 5240 7
3
TL F 5240 8