CRYSTAL UNITS

CRYSTAL
UNITS
For Microprocessor
CRYSTAL UNITS / AT-51SERIES
These crystal units are intended for use as reference clocks in microprocessors or the like.
■ Features
8 Meets the requirements for various applications with the availability
of abundant standard frequencies.
8 Surface mount type.
8 Taping type and gull-wing type are available for automatic mounting.
AT-51
AT-51CD2
■ Specification
Type
Item
Frequency Range
Overtone
AT-51, AT-51CD2
3.1875 ~ 28.63636 MHz
Fundamental
26 ~ 75 MHz
3rd overtone
Frequency Tolerance (25±3˚C)
± 50 × 10-6
Temperature Characteristics
(in reference to +25˚C)
± 50 × 10-6
Operating Temperature Range
–10 ~ +60˚C
4 See Table
Equivalent Series Resistance
500 µW (3.541MHz max)
50 µW (3.541 ~ 28.63636MHz)
Drive Level
500 µW(1000 µW max)
(1000 µW max)
16pF
Standard Load Capacitance
Series
–40 ~ +85˚C
Operable Temperature Range
Typical Frequency (MHz)
3.579545
3.6864
4.0
4.194304
4.332
4.433619
4.5
4.9152
6.0
7.2
7.3728
7.68
8.0
9.8304
10.0
10.25
11.0592
12.0
13.824
14.31818
16.0
16.9344
17.734475
18.432
20.0
24.576
25.0
27.0
28.63636
33.8688
36.864
61.5
Fundamental
■ Dimensions
4 Table Equivalent Series Resistance (Ω)
(mm)
0.2 max
5.5±0.3
5.08
max
4.65 max
AT-51
Fundamental
Reference footprint
6.0
0.8±0.15
4.7±0.1
4.88±0.20
12.4±0.3
11.4±0.2
2.0
3.5 ~ 20±1
+0.05
ø 0.43 –0.03
11.05 max
Overtone
3.7 max
3.70 max
10.10 max
(mm)
10.1 max
9.0
4.88±0.2
AT-51CD2
58
Frequency
Range (MHz)
Equivalent Series
Resistance (Ω)
3.1875 ~ 3.2
400 max
3.2 ~ 3.5
250 max
3.5 ~ 4.0
150 max
4.0 ~ 4.5
120 max
4.5 ~ 5.0
100 max
5.0 ~ 6.0
80 max
6.0 ~ 8.0
75 max
8.0 ~ 10.0
60 max
10.0 ~ 12.0
50 max
12.0 ~ 28.63636
40 max
26.0 ~ 35.0
140 max
3rd overtone 35.0 ~ 48.0
100 max
48.0 ~ 75.0
80 max