SI5325 Datasheet, PDF (6/14 Pages) Silicon Laboratories – UP-PROGRAMMABLE PRECISION CLOCK MULTIPLIER

Si5325
2. Pin Descriptions: Si5325
36 35 34 33 32 31 30 29 28
RST 1
27 SDI
NC 2
26 A2_SS
INT_C1B 3
25 A1
C2B 4
VDD 5
GND 6
GND
Pad
24 A0
23 SDA_SDO
22 SCL
NC 7
21 _{CS_CA}
GND 8
20 NC
NC 9
19 NC
10 11 12 13 14 15 16 17 18
Pin numbers are preliminary and subject to change.
Table 3. Si5325 Pin Descriptions
Pin #
Pin Name
I/O Signal Level
Description
1
RST
I
LVCMOS External Reset.
Active low input that performs external hardware reset of
device. Resets all internal logic to a known state and forces
the device registers to their default value. Clock outputs are
tristated during reset. After rising edge of RST signal, the
Si5325 will perform an internal self-calibration.
This pin has a weak pull-up.
2, 7, 9, 14,
NC
18, 19, 20,
30, 33
—
—
No Connect.
This pin must be left unconnected for normal operation.
3
INT_C1B
O LVCMOS Interrupt/CKIN1 Invalid Indicator.
This pin functions as a device interrupt output or an alarm
output for CKIN1. If used as an interrupt output, INT_PIN
must be set to 1. The pin functions as a maskable interrupt
output with active polarity controlled by the INT_POL register
bit.
If used as an alarm output, the pin functions as a LOS (and
optionally FOS) alarm indicator for CKIN1. Set
CK1_BAD_PIN = 1 and INT_PIN = 0.
0 = CKIN1 present.
1 = LOS (FOS) on CKIN1.
The active polarity is controlled by CK_BAD_POL. If no func-
tion is selected, the pin tristates.
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5325 Register Map.
6
Preliminary Rev. 0.26