SI5367 Datasheet, PDF (9/18 Pages) Silicon Laboratories – μP-PROGRAMMABLE PRECISION CLOCK MULTIPLIER

Si5367
Table 3. Si5367 Pin Descriptions (Continued)
Pin #
12
13
57
Pin Name
INT_ALM
CS0_C3A
CS1_C4A
I/O Signal Level
Description
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 ALRMOUT 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.
I/O LVCMOS Input Clock Select/CKIN3 or CKIN4 Active Clock Indi-
cator.
If manual clock selection is chosen, and if
CKSEL_PIN = 1, the CKSEL pins control clock selection
and the CKSEL_REG bits are ignored.
CS[1:0]
00
01
10
11
Active Input Clock
CKIN1
CKIN2
CKIN3
CKIN4
If CKSEL_PIN = 0, the CKSEL_REG register bits control
this function and these inputs tristate. If these pins are
not functioning as the CS[1:0] inputs and auto clock
selection is enabled, then they serve as the CKIN_n
active clock indicator.
0 = CKIN3 (CKIN4) is not the active input clock
1 = CKIN3 (CKIN4) is currently the active input to the
PLL
The CKn_ACTV_REG bit always reflects the active clock
status for CKIN_n. If CKn_ACTV_PIN = 1, this status will
also be reflected on the CnA pin with active polarity con-
trolled by the CK_ACTV_POL bit. If
CKn_ACTV_PIN = 0, this output tristates.
This pin has a weak pull-down.
29
CKIN4+
I
MULTI Clock Input 4.
30
CKIN4–
Differential clock input. This input can also be driven with
a single-ended signal. CKIN4 serves as the frame sync
input associated with the CKIN2 clock when
CK_CONFIG_REG = 1.
34
CKIN2+
I
MULTI Clock Input 2.
35
CKIN2–
Differential input clock. This input can also be driven with
a single-ended signal.
Note: Internal register names are indicated by underlined italics, e.g. INT_PIN. See Si5368 Register Map.
Preliminary Rev. 0.3
9