9DB1233AGLF IDT [Integrated Device Technology], 9DB1233AGLF Datasheet

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9DB1233AGLF

Manufacturer Part Number
9DB1233AGLF
Description
Twelve Output Differential Buffer for PCIe Gen3
Manufacturer
IDT [Integrated Device Technology]
Datasheet

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Twelve Output Differential Buffer for PCIe Gen3
Recommended Application
12 output PCIe Gen3 zero-delay/fanout buffer
General Description
The 9DB1233 zero-delay buffer supports PCIe Gen3
requirements, while being backwards compatible to PCIe Gen2
and Gen1. The 9DB1233 is driven by a differential SRC output
pair from an IDT 932S421 or 932SQ420 or equivalent main
clock generator. It attenuates jitter on the input clock and has a
selectable PLL bandwidth to maximize performance in systems
with or without Spread-Spectrum clocking.
Output Features
Functional Block Diagram
IDT
®
12 - 0.7V current mode differential HCSL output pairs
Twelve Output Differential Buffer for PCIe Gen3
DIF_IN
DIF_IN#
HIGH_BW#
BYPASS#/PLL
VTTPWRGD#/PD
ADR_SEL
SMBDAT
SMBCLK
OE_(11:0)#
12
CONTROL
LOGIC
COMPATIBLE
SPREAD
PLL
1
Features/Benefits
Key Specifications
M
U
X
3 Selectable SMBus Addresses/Mulitple devices can share
the same SMBus Segment
12 OE# pins/Hardware control of each output
PLL or bypass mode/PLL can dejitter incoming clock
Selectable PLL bandwidth/minimizes jitter peaking in
downstream PLL's
Spread Spectrum Compatible/tracks spreading input clock
for low EMI
SMBus Interface/unused outputs can be disabled
Supports undriven differential outputs in Power Down mode
for power management
Output cycle-cycle jitter < 50ps.
Output-to-output skew < 50 ps
PCIe Gen3 phase jitter < 1.0ps RMS
Pin compatible with DB1200 Yellow Cover Device
12
IREF
DIF(11:0))
DATASHEET
9DB1233
1675B—11/08/10

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9DB1233AGLF Summary of contents

Page 1

Twelve Output Differential Buffer for PCIe Gen3 Recommended Application 12 output PCIe Gen3 zero-delay/fanout buffer General Description The 9DB1233 zero-delay buffer supports PCIe Gen3 requirements, while being backwards compatible to PCIe Gen2 and Gen1. The 9DB1233 is driven by a ...

Page 2

Twelve Output Differential Buffer for PCIe Gen3 Pin Configuration SMBus Address Selection (Pin 29) ADR_SEL Voltage SMBus Adr (Wr/Rd) Low <0.8V Mid 1.2<Vin<1.8V High Vin > 2.0V ® IDT Twelve Output Differential Buffer for PCIe Gen3 VDD 1 64 ...

Page 3

Twelve Output Differential Buffer for PCIe Gen3 Pin Description PIN # PIN NAME 1 VDD 2 DIF_IN 3 DIF_IN# 4 GND 5 OE0# 6 DIF_0 7 DIF_0# 8 VDD 9 GND 10 OE1# 11 DIF_1 12 DIF_1# 13 OE2# ...

Page 4

Twelve Output Differential Buffer for PCIe Gen3 Pin Description (cont.) PIN # PIN NAME 33 SMBDAT 34 GND 35 BYPASS#/PLL 36 VTTPWRGD#/PD 37 DIF_6# 38 DIF_6 39 OE6# 40 GND 41 VDD 42 DIF_7# 43 DIF_7 44 OE7# 45 ...

Page 5

Twelve Output Differential Buffer for PCIe Gen3 Electrical Characteristics - Absolute Maximum Ratings PARAMETER SYMBOL 3.3V Core Supply Voltage VDDA 3.3V Logic Supply Voltage VDD Input Low Voltage V IL Input High Voltage V IH Input High Voltage V ...

Page 6

Twelve Output Differential Buffer for PCIe Gen3 Electrical Characteristics - Clock Input Parameters Supply Voltage VDD = 3.3 V +/-5% COM; PARAMETER SYMBOL Input High Voltage - DIF_IN V IHDIF Input Low Voltage - DIF_IN V ...

Page 7

Twelve Output Differential Buffer for PCIe Gen3 Electrical Characteristics - Output Duty Cycle, Jitter, Skew and PLL Characterisitics Supply Voltage VDD = 3.3 V +/-5% COM; PARAMETER SYMBOL PLL Bandwidth BW PLL Jitter Peaking t JPEAK ...

Page 8

Twelve Output Differential Buffer for PCIe Gen3 Clock Periods Differential Outputs with Spread Spectrum Enabled Measurement Window 1 Clock 1us Symbol Lg- -SSC Absolute Short-term Period Average Definition Minimum Minimum Absolute Absolute Period Period 9.87400 9.99900 DIF DIF 100 ...

Page 9

Twelve Output Differential Buffer for PCIe Gen3 Common Recommendations for Differential Routing L1 length, route as non-coupled 50ohm trace L2 length, route as non-coupled 50ohm trace L3 length, route as non-coupled 50ohm trace Rs Rt Down Device Differential Routing ...

Page 10

Twelve Output Differential Buffer for PCIe Gen3 Alternative Termination for LVDS and other Common Differential Signals (figure 3) Vdiff Vp-p Vcm 0.45v 0.22v 1.08 0.58 0.28 0.6 0.80 0.40 0.6 0.60 0.3 1.2 R1a = R1b = R1 R2a ...

Page 11

Twelve Output Differential Buffer for PCIe Gen3 General SMBus serial interface information for the 9DB1233 How to Write: • Controller (host) sends a start bit. • Controller (host) sends the write address DC • IDT clock will acknowledge • ...

Page 12

Twelve Output Differential Buffer for PCIe Gen3 SMBus Table: Frequency Select Register Byte 0 Pin # Name Bit 7 - HIGH_BW# Bit 6 - BYPASS#/PLL Bit 5 - Reserved - Reserved Bit 4 - Reserved Bit 3 Bit 2 ...

Page 13

Twelve Output Differential Buffer for PCIe Gen3 SMBus Table: Output Enable Readback Byte 4 Pin # Name Bit 7 - Reserved Bit 6 - Reserved - Reserved Bit 5 Bit 4 - Reserved 58,59 OE11# Bit 3 53,54 OE10# ...

Page 14

... Ordering Information Part / Order Number Shipping Packaging 9DB1233AGLF 9DB1233AGLFT Tape and Reel “LF” after the package code denotes the Pb-Free configuration, RoHS compliant. “A” is the device revision designator (will not correlate with the datasheet revision). ® IDT Twelve Output Differential Buffer for PCIe Gen3 ...

Page 15

Twelve Output Differential Buffer for PCIe Gen3 Revision History Rev. Issue Date Who Description 0.1 7/7/2010 RDW Initial Release 1. Changed 'PWD' to 'Default' in SMBus 2. Updated Electrical Tables A 7/12/2010 RDW 3. Move to Final 1. Corrected ...

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