Crystal-to-0.7V Differential HCSL/
LVCMOS Frequency Synthesizer
841S012DI
Datasheet
©2016 Integrated Device Technology, Inc January 4, 20161
GENERAL DESCRIPTION
The 841S012DI is an optimized PCIe, sRIO and Gigabit Ethernet
Frequency Synthesizer and a member of high performance clock
solutions from IDT. The 841S012DI uses a 25MHz parallel resonant
crystal to generate 33.33MHz - 200MHz clock signals, replacing
multiple oscillators and fanout buffer solutions. The device supports
±0.25% center-spread, and -0.5% down-spread clocking with two
spread select pins (SSC[1:0]). The VCO operates at a frequency of
2GHz. The device has three output banks: Bank A with two 100MHz
– 250MHz HCSL outputs; Bank B with seven 33.33MHz – 200MHz
LVCMOS/ LVTTL outputs; and Bank C with one 33.33MHz – 200MHz
LVCMOS/LVTTL output.
All Banks A, B and C have their own dedicated frequency
select pins and can be independently set for the frequencies
mentioned above. The low jitter characteristic of the 841S012DI
makes it an ideal clock source for PCIe, sRIO and Gigabit Ethernet
applications. Designed for networking and industrial applications,
the 841S012DI can also drive the high-speed clock inputs of com-
munication processors, DSPs, switches and bridges.
FEATURES
• Two 0.7V differential HCSL outputs (Bank A), confi gurable for
PCIe (100MHz or 250MHz) and sRIO (100MHz or 125MHz)
clock signals
Eight LVCMOS/LVTTL outputs (Banks B/C),
18Ω typical output impedance
Two REF_OUT LVCMOS/LVTTL clock outputs,
23Ω typical output impedance
• Selectable crystal oscillator interface, 25MHz, 18pF parallel
resonant crystal or one LVCMOS/LVTTL single-ended refer-
ence clock input
• Supports the following output frequencies:
HCSL Bank A: 100MHz, 125MHz, 200MHz and 250MHz
LVCMOS/LVTTL Bank B/C: 33.33MHz, 50MHz, 66.67MHz,
100MHz, 125MHz, 133.33MHz, 166.67MHz and 200MHz
• VCO: 2GHz
• Spread spectrum clock: ±0.25% center-spread (typical) and
-0.6% down-spread (typical)
• PLL bypass and output enable
• RMS period jitter: 10ps (typical), QAx/nQAx outputs
• Full 3.3V supply mode
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package
PIN ASSIGNMENT
15 16 17 18 19 20 21 22 23 24 25 26 27 28
1
2
3
4
5
6
7
8
9
10
11
12
13
14
36
37
38
39
40
41
42
35
34
33
32
31
30
29
V
DD_REFOUT
REF_OUT0
REF_OUT1
GND
GND
REF_IN
V
DD
V
DD
REF_SEL
XTAL_IN
XTAL_OUT
BYPASS
REF_OE
nMR
V
DDOC
QC
GND
QBC_OE
V
DDA
V
DDA
V
DD
GND
GND
IREF
QA0
nQA0
QA1
nQA1
GND
GND
SSC1
SSC0
F_SELB2
F_SELB1
F_SELB0
F_SELC2
F_SELC1
F_SELC0
F_SELA1
F_SELA0
QA_OE
V
DD
QB6
GND
QB5
V
DDOB
QB4
GND
QB3
V
DDOB
VDDOB
QB2
GND
QB1
QB0
V
DDOB
484950515253545556 47 46 45 44 43
ICS841S012DI
56-Lead VFQFN
8mm x 8mm x 0.925mm
package body
K Package
Top View
