ICS9DB202
Integrated
Circuit
Systems, Inc.
PCI EXPRESS
™
JITTER
ATTENUATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
PLL_BW
CLK
Type
Pullup
Description
Selects PLL Bandwidth input. LVCMOS/LVTTL interface levels.
1
2
Input
Input
Pulldown Non-inverting differential clock input.
Pullup/
3
nCLK
Input
Inverting differential clock input. VDD/2 default when left floating.
Pulldown
4
FS0
VDD
Input
Power
Power
Pullup Frequency select pin. LVCMOS/LVTTL interface levels.
Core supply pins.
5, 9, 12, 16
6, 15
GND
Power supply ground.
PCIEXT0,
PCIEXC0
7, 8
Output
Input
Differential output pairs. HCSL interface levels.
Output enable. When HIGH, forces outputs to HiZ state.
Pulldown
10, 11
nOE0, nOE1
When LOW, enables outputs. LVCMOS/LVTTL interface levels.
PCIEXC1,
PCIEXT1
13, 14
17
Output
Input
Differential output pairs. HCSL interface levels.
FS1
Pulldown Frequency select pin. LVCMOS/LVTTL interface levels.
A fixed precision resistor (475Ω) from this pin to ground provides a
reference current used for differential current-mode PCIEX clock outputs.
BYPASS pin. When HIGH. bypass mode, when LOW, PLL mode.
18
IREF
Input
19
20
BYPASS
VDDA
Power Pulldown
Power
LVCMOS/LVTTL interface levels.
Analog supply pin. Requires 24Ω series resistor.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
Parameter
Test Conditions
Minimum Typical
Maximum Units
Input Capacitance
Input Pullup Resistor
4
pF
KΩ
KΩ
RPULLUP
51
51
RPULLDOWN Input Pulldown Resistor
TABLE 3B. RATIO OF OUTPUT FREQUENCY TO
INPUT FREQUENCY FUNCTION TABLE, FS1
TABLE 3C. BYPASS TABLE
TABLE 3A. RATIO OF OUTPUT FREQUENCY TO
INPUT FREQUENCY FUNCTION TABLE, FS0
Inputs
Mode
Inputs
Outputs
PCIEX0
5/4
Inputs
Outputs
PCIEX1
1
BYPASS
FS0
0
FS1
0
0
PLL Mode
Bypass Mode
(output = inputs)
1
1
1
1
5/4
TABLE 3D. OUTPUT ENABLE
FUNCTION TABLE, NOE0
TABLE 3E. OUTPUT ENABLE
FUNCTION TABLE, NOE1
TABLE 3F. PLL BANDWIDTH TABLE
Inputs
Outputs
PCIEX0
Enabled
HiZ
Inputs
Inputs
Outputs
PCIEX1
Enabled
HiZ
Bandwidth
PLL_BW
nOE0
nOE1
0
1
0
1
500kHz
1MHz
0
1
9DB202CG
www.icst.com/products/hiperclocks.html
REV. A OCTOBER 6, 2004
2
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
