9ZX21901B_15 Datasheet, PDF (9/18 Pages) Integrated Device Technology – 19-Output Differential Zbuffer for PCIe Gen2/3 and QPI

9ZX21901B
19-Output Differential Zbuffer for PCIe Gen2/3 and QPI
Clock Periods - Differential Outputs with Spread Spectrum Disabled
Measurement Window
SSC OFF
Center
Freq.
MHz
1 Clock
-c2c jitter
AbsPer
Min
1us
-SSC
Short-Term
Average
Min
0.1s
- ppm
Long-Term
Average
Min
0.1s
0 ppm
Period
Nominal
0.1s
+ ppm
Long-Term
Average
Max
DIF
100.00 9.94900
133.33 7.44925
9.99900
7.49925
10.00000
7.50000
10.00100
7.50075
1us
+SSC
Short-Term
Average
Max
1 Clock
+c2c jitter
AbsPer
Max
10.05100
7.55075
Units Notes
ns 1,2,3
ns 1,2,4
Clock Periods - Differential Outputs with Spread Spectrum Enabled
Measurement Window
SSC ON
Center
Freq.
MHz
1 Clock
-c2c jitter
AbsPer
Min
1us
-SSC
Short-Term
Average
Min
0.1s
- ppm
Long-Term
Average
Min
0.1s
0 ppm
Period
Nominal
0.1s
+ ppm
Long-Term
Average
Max
1us
+SSC
Short-Term
Average
Max
1 Clock
+c2c jitter
AbsPer
Max
Units
DIF
99.75 9.94906 9.99906 10.02406 10.02506
133.00 7.44930 7.49930 7.51805
7.51880
10.02607
7.51955
10.05107 10.10107 ns
7.53830
7.58830 ns
Notes:
1_{Guaranteed by design and characterization, not 100% tested in production.}
2 _{All Long Term Accuracy specifications are guaranteed with the assumption that the input clock complies with CK420BQ/CK410B+}
accuracy requirements (+/-100ppm). The 9ZX21901 itself does not contribute to ppm error.
3 _{Driven by SRC output of main clock, 100 MHz PLL Mode or Bypass mode}
4 _{Driven by CPU output of main clock, 133 MHz PLL Mode or Bypass mode}
Notes
1,2,3
1,2,4
Power Management Table
Inputs
Control Bits/Pins
DIF_IN/
SMBus
DIF(5:12)/ Other DIF/
CKPWRGD_PD#
DIF_IN#
EN bit OE# Pin DIF(5:12)#
DIF#
0
X
X
X
Hi-Z¹
Hi-Z¹
0
X
Hi-Z¹
Hi-Z¹
1
Running
1
0
Running
Running
1
1
Hi-Z¹
Running
NOTE:
1. Due to external pull down resistors, HI-Z results in Low/Low on the True/Complement outputs
Outputs
DFB_OUT/
DFB_OUT#
Hi-Z¹
Running
Running
Running
PLL
State
OFF
ON
ON
ON
Thermal Characteristics
Parameter
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Case
Thermal Resistance Junction to Board
Symbol Conditions Min. Typ. Max. Units
θJA Still air
26.2
°C/W
θJA 1 m/s air flow
23.1
°C/W
θJA 3 m/s air flow
19.6
°C/W
θJC
10.4
°C/W
θJB
0.3
°C/W
9ZX21901 Differential Test Loads
HCSL Output
Buffer
10 inches
Rs
Differential Zo
Rs
Rp Rp
IDT^® 19-Output Differential Zbuffer for PCIe Gen2/3 and QPI
2pF
2pF
9
Differential Output Termination Table
DIF Zo (^Ω) Iref (^Ω) Rs (^Ω) Rp (^Ω)
100
475 33
50
85
412 27 42.2 or 43.2
1586P - 11/19/15