ICS874002 Datasheet, PDF (2/10 Pages) Integrated Circuit Systems – PCI EXPRESS JITTER ATTENUATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS874002
PCI EXPRESS™
JITTER ATTENUATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 20
nQA0, QA0 Output
Differential output pair. LVDS interface levels.
2, 19
3
V_DDO
FB_OUT
Power
Output
Output supply pins.
Non-inverting differential feedback output.
4
nFB_OUT Output
Inverting differential feedback output.
Active HIGH Master Reset. When logic HIGH, the internal dividers are
5
MR
Input
Pulldown
reset causing the true outputs (nQx) to go low and the inverted outputs
(Qx) to go high. When logic LOW, the internal dividers and the outputs
are enabled. LVCMOS/LVTTL interface levels.
6
BW_SEL
Input
Pullup/
Pulldown
Selects PLL Band Width input. LVCMOS/LVTTL interface levels.
7
nc
Unused
No connect.
8
V_DDA
Power
Analog supply pin.
9
F_SEL
Input Pulldown Frequency select pin. LVCMOS/LVTTL interface levels.
10
V_DD
Power
Core supply pin.
11
OE
Input
Pullup
Output enable pin. When HIGH, the outputs are active. When LOW, the
outputs are in a high impedance state. LVCMOS/LVTTL interface levels.
12
CLK
Input Pulldown Non-inverting differential clock input.
13
nCLK
Input Pullup Inverting differential clock input.
14
GND
Power
Power supply ground.
15
FB_IN
Input Pulldown Non-inverting differential feedback input.
16
nFB_IN
Input Pullup Inverting differential feedback input.
17, 18 nQA1, QA1 Output
Differential output pair. LVDS interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C_IN
R_PULLUP
R_PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
KΩ
KΩ
TABLE 3A. OUTPUT ENABLE FUNCTION TABLE
Inputs
OE
0
1
Outputs
QAx/nQAx FB_OUT/nFB_OUT
HiZ
Enabled
Enabled
Enabled
TABLE 3B. PLL BANDWIDTH/PLL BYPASS CONTROL
Inputs
BW_SEL
0
1
Float
PLL
Bandwidth
~200KHz
~800KHz
~400KHz
874002AG
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2
REV. A JANUARY 19, 2005