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PDF CF5018 Data sheet ( Hoja de datos )
| Número de pieza | CF5018 | |
| Descripción | 2.5V 3rd Overtone Crystal Oscillator Module ICs | |
| Fabricantes | Nippon Precision Circuits | |
| Logotipo |  |
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CF5018 series
2.5V 3rd Overtone Crystal Oscillator Module ICs
OVERVIEW
The CF5018 series are crystal oscillator ICs that operate from 2.5V. Devices are available that provide 3rd
overtone oscillation in the range 30MHz to 80MHz. They are optimized for 2.5V operation, resulting in stable
oscillator startup characteristics and output duty stability. They feature a large reduction in chip surface area
compared to existing devices, making possible the construction of small-sized crystal oscillator.
FEATURES
I 2.25 to 2.75V operating supply voltage range
I 30MHz to 80MHz oscillation frequency range
(varies with version)
I – 40 to 85°C operating temperature range
I Oscillation capacitors CG, CD built-in
I Inverter amplifier feedback resistor built-in
I Standby function
• High impedance in standby mode, oscillator stops
I Low standby current
• Power-saving pull-up resistor built-in
I fO output frequency (oscillation frequency)
I 8mA output drive capability (VDD = 2.25V)
I CMOS output duty level (1/2VDD)
I 50 ± 5% output duty (at 1/2VDD)
I 30pF output load
I Molybdenum-gate CMOS process
I Chip form (CF5018AL×)
SERIES CONFIGURATION
Version
CF5018ALA
Operating
supply voltage
range [V]
Recommended operating
frequency range1 [MHz]
30 to 36
gm ratio
0.25
Built-in capacitance [pF]
CG CD
Rf
[kΩ]
4.7
CF5018ALB
CF5018ALC
2.25 to 2.75
36 to 40
40 to 50
0.50
0.75 8
3.5
15
3.5
CF5018ALD
50 to 60
1.00
3.0
CF5018ALE
60 to 80
1.50
10 3.5
1. The recommended operating frequency is a yardstick value derived from the crystal used for NPC characteristics authentication. However, the
oscillator frequency band is not guaranteed. Specifically, the characteristics can vary greatly due to crystal characteristics and mounting condi-
tions, so the oscillation characteristics of components must be carefully evaluated.
ORDERING INFORMATION
Device
CF5018AL×–2
Package
Chip form
SEIKO NPC CORPORATION —1
1 page  
CF5018 series
Switching Characteristics
VDD = 2.25 to 2.75V, VSS = 0V, Ta = −40 to +85°C unless otherwise noted.
www.datasheet4u.coPmarameter
Symbol
Condition
Rating
min typ max
Unit
Output rise time
tr Measurement cct 3, load cct 1, 0.1VDD to 0.9VDD , CL = 30pF
Output fall time
tf Measurement cct 3, load cct 1, 0.9VDD to 0.1VDD , CL = 30pF
Output duty cycle1
Duty
Measurement cct 3, load cct 1, VDD = 2.5V, Ta = 25°C,
f = 80MHz , CL = 30pF
Output disable delay time2 tPLZ Measurement cct 6, load cct 1, VDD = 2.5V, Ta = 25°C,
Output enable delay time2 tPZL CL = 15pF
–
–
45
–
–
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
fO 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
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CF5018.PDF ] | |
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