CF5018 Datasheet, PDF (5/8 Pages) Nippon Precision Circuits Inc – 2.5V 3rd Overtone Crystal Oscillator Module ICs

CF5018 series
Switching Characteristics
V_DD = 2.25 to 2.75V, V_SS = 0V, Ta = −40 to +85°C unless otherwise noted.
Parameter
Symbol
Condition
Rating
Unit
min
typ
max
Output rise time
t_r
Measurement cct 3, load cct 1, 0.1V_DD to 0.9V_DD , C_L = 30pF
–
Output fall time
t_f
Measurement cct 3, load cct 1, 0.9V_DD to 0.1V_DD , C_L = 30pF
–
Output duty cycle¹
Duty
Measurement cct 3, load cct 1, V_DD = 2.5V, Ta = 25°C,
f = 80MHz , C_L = 30pF
45
Output disable delay time² t_{PLZ Measurement cct 6, load cct 1, VDD = 2.5V, Ta = 25°C,}
–
Output enable delay time² t_PZL ^{CL = 15pF}
–
3
6
ns
3
6
ns
–
55
%
–
100
ns
–
100
ns
1. The duty cycle characteristic is checked the sample chips of each production lot.
2. Oscillator stop function is built-in. When INHN goes LOW, normal output stops. When INHN goes HIGH, normal output is not resumed until after the
oscillator start-up time has elapsed.
Current consumption and Output waveform with NPC’s standard crystal
Cb
L Ca R
f [MHz]
30
40
50
60
70
85
R [Ω]
18.62
20.53
22.17
15.37
25.42
20.58
L [mH]
16.24
11.34
7.40
3.83
4.18
5.22
Ca [fF]
1.733
1.396
1.370
1.836
1.254
0.671
Cb [pF]
5.337
3.989
4.105
5.191
5.170
4.965
FUNCTIONAL DESCRIPTION
Standby Function
When INHN goes LOW, the oscillator stops and the oscillator output on Q becomes high impedance.
INHN
HIGH (or open)
LOW
Q
f_O output frequency
High impedance
Oscillator
Normal operation
Stopped
Power-saving Pull-up Resistor
The INHN pull-up resistance changes in response to the input level (HIGH or LOW). When INHN goes LOW
(standby state), the pull-up resistance becomes large to reduce the current consumption during standby.
SEIKO NPC CORPORATION —5