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
I
I
I
I
I
I
2.25 to 2.75V operating supply voltage range
30MHz to 80MHz oscillation frequency range
(varies with version)
– 40 to 85°C operating temperature range
Oscillation capacitors C
G
, C
D
built-in
Inverter amplifier feedback resistor built-in
Standby function
• High impedance in standby mode, oscillator stops
Low standby current
• Power-saving pull-up resistor built-in
I
I
I
I
I
I
I
f
O
output frequency (oscillation frequency)
8mA output drive capability (V
DD
= 2.25V)
CMOS output duty level (1/2VDD)
50
±
5% output duty (at 1/2VDD)
30pF output load
Molybdenum-gate CMOS process
Chip form (CF5018AL×)
SERIES CONFIGURATION
Version
CF5018ALA
CF5018ALB
CF5018ALC
CF5018ALD
CF5018ALE
2.25 to 2.75
Operating
supply voltage
range [V]
Recommended operating
frequency range
1
[MHz]
30 to 36
36 to 40
40 to 50
50 to 60
60 to 80
Built-in capacitance [pF]
gm ratio
C
G
0.25
0.50
15
0.75
1.00
1.50
10
8
3.5
3.0
3.5
C
D
Rf
[kΩ]
4.7
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
CF5018 series
PAD LAYOUT
(Unit:
µm)
(720,730)
VDD
HA5018
NPC
Q
VSS
Y
INHN
(0,0)
XT
X
XTN
Chip size: 0.72
×
0.73mm
Chip thickness: 220 ± 30µm
PAD size: 90µm
Chip base: V
DD
level
PIN DESCRIPTION and PAD DIMENSIONS
Pad dimensions [µm]
Name
I/O
Description
X
INHN
XT
XTN
VSS
Q
VDD
I
I
O
–
O
–
Output state control input. High impedance when LOW (oscillator stops).
Power-saving pull-up resistor built-in.
Amplifier input
Amplifier output
Ground
Output. Output frequency. High impedance in standby mode
Supply voltage
Crystal connection pins.
Crystal is connected between XT and XTN.
151
238
503
588
588
131
Y
277
131
131
345
598
598
BLOCK DIAGRAM
VDD VSS
XTN
C
G
R
f1
C
f
C
D
XT
R
f2
Q
INHN
INHN = LOW active
SEIKO NPC CORPORATION —2
CF5018 series
SPECIFICATIONS
Absolute Maximum Ratings
V
SS
= 0V
Parameter
Supply voltage range
Input voltage range
Output voltage range
Operating temperature range
Storage temperature range
Output current
Symbol
V
DD
V
IN
V
OUT
T
opr
T
STG
I
OUT
Condition
Rating
−0.5
to +7.0
−0.5
to V
DD
+ 0.5
−0.5
to V
DD
+ 0.5
−40
to +85
−65
to +150
20
Unit
V
V
V
°C
°C
mA
Recommended Operating Conditions
V
SS
= 0V, f
≤
80MHz, C
L
≤
30pF
Parameter
Supply voltage range
Input voltage range
Operating temperature range
Symbol
V
DD
V
IN
T
OPR
Condition
Rating
2.25 to 2.75
V
SS
to V
DD
−40
to +85
Unit
V
V
°C
SEIKO NPC CORPORATION —3
CF5018 series
Electrical Characteristics
V
DD
= 2.25 to 2.75V, V
SS
= 0V, Ta =
−40
to +85°C unless otherwise noted.
Rating
Parameter
HIGH-level output voltage
LOW-level output voltage
HIGH-level input voltage
LOW-level input voltage
Output leakage current
Symbol
V
OH
V
OL
V
IH
V
IL
I
Z
Condition
min
Q: Measurement cct 1, V
DD
= 2.25V, I
OH
= 8mA
Q: Measurement cct 2, V
DD
= 2.25V, I
OL
= 8mA
INHN
INHN
Q: Measurement cct 2, INHN = LOW
V
OH
= V
DD
V
OL
= V
SS
CF5018ALA
f = 30MHz
CF5018ALB
f = 40MHz
Current consumption
I
DD
Measurement cct 3, load cct 1,
INHN = open, C
L
= 30pF
CF5018ALC
f = 50MHz
CF5018ALD
f = 60MHz
CF5018ALE
f = 80MHz
Standby current
INHN pull-up resistance
I
ST
R
UP1
R
UP2
CF5018ALA
CF5018ALB
AC feedback resistance
R
f1
Design value. A monitor pattern on a
wafer is tested.
CF5018ALC
CF5018ALD
CF5018ALE
DC feedback resistance
AC feedback capacitance
R
f2
C
f
C
G
Measurement cct 5
Design value. A monitor pattern on a wafer is tested.
Design value. A monitor pattern on a wafer is tested.
CF5018ALA
CF5018ALB
CF5018ALC
CF5018ALD
CF5018ALE
Measurement cct 3, INHN = LOW
Measurement cct 4
20
3.99
2.97
2.97
2.55
2.97
50
8.5
6.8
100
4.7
3.5
3.5
3.0
3.5
–
10
8
200
5.41
4.03
4.03
3.45
4.03
150
11.5
9.2
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
pF
pF
1.65
–
0.7V
DD
–
–
–
–
–
–
–
–
–
2
typ
1.95
0.3
–
–
–
–
6
8
10
11
15
–
6
max
–
0.4
–
0.3V
DD
10
10
12
16
20
22
30
3
12
V
V
V
V
µA
µA
mA
mA
mA
mA
mA
µA
MΩ
Unit
Built-in capacitance
C
D
Design value. A monitor pattern on a
wafer is tested.
12.7
15
17.3
pF
8.5
10
11.5
pF
SEIKO NPC CORPORATION —4
CF5018 series
Switching Characteristics
V
DD
= 2.25 to 2.75V, V
SS
= 0V, Ta =
−40
to +85°C unless otherwise noted.
Rating
Parameter
Output rise time
Output fall time
Output duty cycle
1
Output disable delay time
2
Output enable delay time
2
Symbol
t
r
t
f
Duty
t
PLZ
t
PZL
Condition
min
Measurement cct 3, load cct 1, 0.1V
DD
to 0.9V
DD
, C
L
= 30pF
Measurement cct 3, load cct 1, 0.9V
DD
to 0.1V
DD
, C
L
= 30pF
Measurement cct 3, load cct 1, V
DD
= 2.5V, Ta = 25°C,
f = 80MHz , C
L
= 30pF
Measurement cct 6, load cct 1, V
DD
= 2.5V, Ta = 25°C,
C
L
= 15pF
–
–
45
–
–
typ
3
3
–
–
–
max
6
6
55
100
100
ns
ns
%
ns
ns
Unit
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
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
L
Ca
R
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
