SA.45s Chip-Scale Atomic Clock
SA.45s CSAC User Guide Revision D
5
Table 2 • SA45s CSAC Pinout
PIN
I.D.
1
Tune
Bottom view
2
N/A
3
N/A
4
BITE
5
Tx
6
Rx
7
VCC
8
GND
9
1PPS input
10
1PPS output
11
N/A
12
RF output
Note: Pins labeled N/A are not present in the SA.45s.
3.2.5
Recommended Operating Characteristics
The SA.45 pinout is shown in the previous table . The electrical function of each pin is shown in the
following table.
Table 3 • Recommended Operating Characteristics
PIN
Function
Level
Reference Section
1
Analog tuning input
1
0 V–2.5 V
"Analog Tuning" section (see page
14)
4
Built-in test
equipment (BITE)
2
LogicH > 2.8 V
LogicL < 0.3 V
"Built-In Test Equipment (BITE)"
section (see page 7)
5, 6
RS232
2.8 V < LogicH < V
CC
0 V < LogicL < 0.3 V
"Programmers Reference" section
(see page 17)
7
VCC
3.3 VDC ± 0.1 VDC
8
Ground
9
1PPS in
3
2.5 V < LogicH < V
CC
0 V < LogicL < 0.5 V
10
1PPS out
4, 5
2.8 V < LogicH < V
CC
0 V < LogicL < 0.3 V
"1PPS Output" section (see page
10)
12
RF out
2.8 V < LogicH < V
CC
0 V < LogicL < 0.3 V
