XRK4991 Datasheet, PDF (3/12 Pages) Exar Corporation – 3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

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REV. 1.0.1
PIN DESCRIPTIONS
XRK4991
3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
PIN NAME
CLKIN
FB_IN
FSEL
PLL_BYPASS
SELA0
SELA1
SELB0
SELB1
SELC0
SELC1
SELD0
SELD1
QA0
QA1
QB0
QB1
QC0
QC1
QD0
QD1
V_CCN
V_CCQ
GND
PIN #
1
17
3
31
26
27
29
30
4
5
6
7
24
23
20
19
15
14
11
10
9
16
18
25
2
8
12
13
21
22
28
32
TYPE
I
I
I
I
I
DESCRIPTION
Reference clock input.
PLL’s feedback input. (Normally connected to one of the eight outputs)
Tri-level frequency range select. See Table 1
Tri-level select. See PLL_BYPASS section.
Tri-level select inputs for Bank A outputs (QA0, QA1). See Table 2.
I Tri-level select inputs for Bank B outputs (QB0, QB1). See Table 2.
I Tri-level select inputs for Bank C outputs (QC0, QC1). See Table 2.
I Tri-level select inputs for Bank D outputs (QD0, QD1). See Table 2.
O Bank A output pair. See Table 2.
O Bank B output pair. See Table 2.
O Bank C output pair. See Table 2.
O Bank D output pair. See Table 2.
PWR Power supply for output drivers.
PWR Power supply for internal circuitry.
PWR Ground.
3