IDT
®
18 Output PCIe G2/QPI Differential Buffer with 2:1 input mux 1463E — 07/20/11
9EX21801A
18 Output PCIe G2/QPI Differential Buffer with 2:1 input mux
7
Datasheet
Electrical Characte ristics - Skew and Differential Jitter Parameters
T
A
= T
COM
or T
IND
; Supply Voltage V
DD
= 3 .3 V +/-5%
Group Parameter Description Min TYP Max Units Notes
CLK_IN, DIF[x:0]
t
SPO_PLL100M
Input-to-Output Skew in PLL mode (1:1 only),
nominal value @ 25°C
3.3V
100MHz
950 1000 1125 ps 1,2,4,5,8
CLK_IN, DIF[x:0] t
SPO_PLL133M
Input-to-Output Skew in PLL mode (1:1 only),
nominal value @ 25 °C, 3.3V, 133MHz
1100 1125 1175 ps 1,2,4,5,8
CLK_IN, DIF[x:0]
t
PD_BYP
Input-to-Output Skew in Bypass mode (1:1 only),
nominal value @ 25°C, 3.3V
4 4.7 5.2 ns 1,2,3,5
CL K _ IN , D IF [x :0 ]
8
t
SP O_ PLL
Input-to-Output Skew Variation in PLL mode
(over specified voltage / temperature operating ranges)
|250| |350| ps
1,2,4,5,6,
10
CL K _ IN , D IF [x :0 ]
8
t
PD_ BY P
Input-to-Output Skew Variation in Bypass mode
(over specified voltage / temperature operating ranges)
|800| |900| ps
1,2,3,4,5,
6,10
DIF[17:0] t
SKEW_A19
Output-to-Output Skew across all 18 outputs
(Common to Bypass and PLL mode - all outputs at same gear)
100 150 ps 1,2,3
DIF[17:0] t
JPH
Differential Phase Jitter (RMS Value) 2 10 ps 1,4,7
DIF[17:0]
t
SSTERROR
Differential Spread Spectrum Tracking Error (peak to peak) 20 80 ps 1,4,9
NOTES:
8. t is the period of the input clock
10. This parameter is an absolute value. It is not a double-sided figure.
9. Differential spread spectrum tracking error is the difference in spread spectrum tracking between two ICS9EX21801 devices This parameter is measured at the outputs of
two separate ICS9EX21801 devices driven by a single CK410B+ in Spread Spectrum mode. The ICS9EX21801's must be set to high ba ndwidth. The spread spectrum
characteristics are: maximum of 0.5%, 30-33KHz modulation frequency, linear profile.
5. Measured with scope averaging on to find mean value.
6. Long-term variation from nominal of input-to-output skew over temperature and voltage for a single device.
7. This parameter is measured at the outputs of two separate ICS9EX21801 devices driven by a single CK410B+. The ICS9EX21801's must be set to high bandwidth.
Differential phase jitter is the accumulation of the phase jitte r not shared by the outputs (eg. not including the affects of spread spectrum). Target ranges of consideration are
a
ents with BW of 1-22Mhz and 11-33Mhz.
1. Measured into fixed 2 pF load cap. Input to output skew is measured at the fi rst output edge following the corresponding input.
2. Measured from differential cross-point to differential cross-point
3. All Bypass Mode Input-to-Output specs refer to the timing between an input edge and the specific output edge created by it.
4. This parameter is deterministic for a given device
