SI5368 Datasheet, PDF (8/18 Pages) Silicon Laboratories – ANY-RATE PRECISION CLOCK MULTIPLIER/JITTER ATTENUATOR

Si5368
Table 3. Si5368 Pin Descriptions (Continued)
Pin #
Pin Name I/O Signal Level
Description
5, 6, 15, 27,
62, 63, 76,
79, 81, 84,
86, 89, 91,
94, 96, 99,
100
7, 8, 14, 18,
19, 26, 28,
31, 33, 36,
38, 41, 43,
46, 64, 65
V_DD
GND
Vdd
GND
Supply
Supply
V_DD.
The device operates from a 1.8 or 2.5 V supply. Bypass capaci-
tors should be associated with the following V_DD pins:
Pins
Bypass Cap
5, 6
0.1 µF
15
0.1 µF
27
0.1 µF
62, 63
0.1 µF
76, 79
1.0 µF
81, 84
0.1 µF
86, 89
0.1 µF
91, 94
0.1 µF
96, 99, 100 0.1 µF
Ground.
This pin must be connected to system ground. Minimize the
ground path impedance for optimal performance.
9
C1B
O LVCMOS CKIN1 Invalid Indicator.
This pin performs the CK1_BAD function if CK1_BAD_PIN = 1
and is tristated if CK1_BAD_PIN = 0. Active polarity is con-
trolled by CK_BAD_POL.
0 = No alarm on CKIN1.
1 = Alarm on CKIN1.
10
C2B
O LVCMOS CKIN2 Invalid Indicator.
This pin performs the CK2_BAD function if CK2_BAD_PIN = 1
and is tristated if CK2_BAD_PIN = 0. Active polarity is con-
trolled by CK_BAD_POL.
0 = No alarm on CKIN2.
1 = Alarm on CKIN2.
11
C3B
O LVCMOS CKIN3 Invalid Indicator.
This pin performs the CK3_BAD function if CK3_BAD_PIN = 1
and is tristated if CK3_BAD_PIN = 0. Active polarity is con-
trolled by CK_BAD_POL.
0 = No alarm on CKIN3.
1 = Alarm on CKIN3.
12
INT_ALM O LVCMOS Interrupt/Alarm Output Indicator.
This pin functions as a maskable interrupt output with active
polarity controlled by the INT_POL register bit. The INT output
function can be turned off by setting INT_PIN = 0. If the ALR-
MOUT function is desired instead on this pin, set
ALRMOUT_PIN = 1 and INT_PIN = 0.
0 = ALRMOUT not active.
1 = ALRMOUT active.
The active polarity is controlled by CK_BAD_POL. If no function
is selected, the pin tristates.
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
8
Preliminary Rev. 0.3