SI554 Datasheet, PDF (9/15 Pages) Silicon Laboratories – QUAD FREQUENCY VOLTAGE-CONTROLLED CRYSTAL

2. Pin Descriptions
Si554
(Top View)
FS[1]
V_{C 1}
7
6 VDD
OE 2
5 CLK–
GND 3
4
8
FS[0]
CLK+
Table 11. Si554 Pin Descriptions
Pin
Name
Type
Function
1
V_C
Analog Input ^{Control Voltage}
2
OE*
Input
Output Enable (Polarity = High):
0 = clock output disabled (outputs tri-stated)
1 = clock output enabled
3
GND
Ground
Electrical and Case Ground
4
CLK+
Output
Oscillator Output
5
CLK–
(N/A for CMOS)
Output
Complementary Output
(N/C for CMOS)
6
V_DD
7
FS[1]*
Power
Input
Power Supply Voltage
Frequency Select MSB
8
FS[0]*
Input
Frequency Select LSB
*Note: FS[1:0] and OE include a 17 k pullup resistor to V_DD. Output Enable polarity selectable at time of order. See Section
3. "Ordering Information" on page 10 for details on frequency select and OE polarity ordering options.
Rev. 1.1
9