18 Output PCIe G2/QPI Differential Buffer with 2:1 input mux

1463B — 01/20/10

ICS9EX21801A

18 Output PCIe G2/QPI Differential Buffer with 2:1 input mux

7

Datasheet

Electrical Characteristics - Skew and Differential Jitter Parameters

Group

Parameter

Description

Min

TYP

Max

Units

Notes

CLK_IN, DIF[x:0]

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]

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]

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

CLK_IN, DIF [x:0]

∆t

SPO_PLL

Input-to-Output Skew Variation in PLL mode

(over specified voltage / temperature operating ranges)

|250| |350|

ps

1,2,4,5,6,

10

CLK_IN, DIF [x:0]

∆t

PD_BYP

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]

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]

Differential Phase Jitter (RMS Value)

2

10

ps

1,4,7

DIF[17:0]

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 bandwidth. 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 jitter not shared by the outputs (eg. not including the affects of spread spectrum). Target ranges of consideration are

agents with BW of 1-22Mhz and 11-33Mhz.

1. Measured into fixed 2 pF load cap. Input to output skew is measured at the first 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