DATASHEET
9DBU0731 MARCH 8, 2017 1 ©2017 Integrated Device Technology, Inc.
7-Output 1.5V PCIe Gen1-2-3 Fanout Buffer 9DBU0731
Description
The 9DBU0731 is a member of IDT's 1.5V Ultra-Low-Power
(ULP) PCIe family. The device has 7 output enables for clock
management, and 3 selectable SMBus addresses.
Recommended Application
1.5V PCIe Gen1-2-3 Fanout Buffer (FOB)
Output Features
7 – 1–167MHz Low-Power (LP) HCSL DIF pairs
Key Specifications
DIF additive cycle-to-cycle jitter < 5ps
DIF output-to-output skew < 60ps
DIF additive phase jitter is < 300fs rms for PCIe Gen3
DIF additive phase jitter < 350s rms for SGMII
Features/Benefits
LP-HCSL outputs; save 14 resistors compared to standard
HCSL outputs
36mW typical power consumption; eliminates thermal
concerns
Outputs can optionally be supplied from any voltage
between 1.05V and 1.5V; maximum power savings
Spread Spectrum (SS) compatible; allows SS for EMI
reduction
OE# pins for each output; support DIF power management
HCSL-compatible differential input; can be driven by
common clock sources
SMBus-selectable features; optimize signal integrity to
application
slew rate for each output
differential output amplitude
Device contains default configuration; SMBus interface not
required for device operation
3.3V tolerant SMBus interface works with legacy controllers
Three selectable SMBus addresses; multiple devices can
easily share an SMBus segment
5 × 5 mm 40-VFQFPN package; minimal board space
Block Diagram
CONTROL
LOGIC
^CKPWRGD_PD#
SDATA_3.3
vOE(6:0)#
SCLK_3.3
vSADR
CLK_IN
7
DIF6
`
DIF4
DIF3
DIF1
DIF0
CLK_IN#
DIF2
DIF5
7-OUTPUT 1.5V PCIE GEN1-2-3 FANOUT BUFFER 2 MARCH 8, 2017
9DBU0731 DATASHEET
Pin Configuration
SMBus Address Selection Table
Power Management Table
Power Connections
^CKPWRGD_PD#
VDDIO
vOE5#
DIF5#
DIF5
vOE4#
DIF4#
DIF4
VDDIO
VDD1.5
40 39 38 37 36 35 34 33 32 31
vSADR_tri
130
NC
vOE6#
229
vOE3#
DIF6
328
DIF3#
DIF6#
427
DIF3
VDDR1.5
526
VDDIO
CLK_IN
625
VDDO1.5
CLK_IN#
724
vOE2#
GNDDIG
823
DIF2#
SCLK_3.3
922
DIF2
SDATA_3.3
10 21
vOE1#
11 12 13 14 15 16 17 18 19 20
VDDDIG1.5
VDDIO
vOE0#
DIF0
DIF0#
VDD1.5
VDDIO
DIF1
DIF1#
NC
9DBU0731
ePad is GND
40-VFQFPN, 5mm x 5mm 0.4mm pin pitch
^ prefix indicates internal Pull-Up Resistor
v prefix indicates Internal Pull-Down Resistor
SADR Address
0 1101011
M 1101100
1 1101101
x
State of SADR on first application of
CKPWRGD_PD#
+ Read/Write bit
x
x
True O/P Comp. O/P
0XXXLowLow
1 Running 0 X Low Low
1 Running 1 0 Running Running
1 Running 1 1 Low Low
CLK_IN
DIFx
OEx# PinCKPWRGD_PD#
SMBus
OEx bit
Pin Number
VDD VDDIO GND
541
Input
receiver
analo
g
11 8 Digital Power
16,25,31
12,17,26,32,
39
41
DIF
outputs,Logic
Description
MARCH 8, 2017 3 7-OUTPUT 1.5V PCIE GEN1-2-3 FANOUT BUFFER
9DBU0731 DATASHEET
Pin Descriptions
PIN # PIN NAME PIN TYPE DESCRIPTION
1 vSADR_tri
LATCHED
IN
Tri-level latch to select SMBus Address. It has an internal 120kohm pull down resistor. See
SMBus Address Selection Table.
2vOE6# IN
Active low input for enabling output 6. This pin has an internal 120kohm pull-down.
1 =disable outputs, 0 = enable outputs
3 DIF6 OUT Differential true clock output.
4 DIF6# OUT Differential complementary clock output.
5 VDDR1.5 PWR
1.5V power for differential input clock (receiver). This VDD should be treated as an Analog
power rail and filtered appropriately.
6 CLK_IN IN True Input for differential reference clock.
7 CLK_IN# IN Complementary Input for differential reference clock.
8 GNDDIG GND Ground pin for digital circuitry.
9 SCLK_3.3 IN Clock pin of SMBus circuitry, 3.3V tolerant.
10 SDATA_3.3 I/O Data pin for SMBus circuitry, 3.3V tolerant.
11 VDDDIG1.5 PWR 1.5V digital power (dirty power)
12 VDDIO PWR Power supply for differential outputs
13 vOE0# IN
Active low input for enabling output 0. This pin has an internal 120kohm pull-down.
1 =disable outputs, 0 = enable outputs
14 DIF0 OUT Differential true clock output.
15 DIF0# OUT Differential complementary clock output.
16 VDD1.5 PWR Power supply, nominally 1.5V
17 VDDIO PWR Power supply for differential outputs
18 DIF1 OUT Differential true clock output.
19 DIF1# OUT Differential complementary clock output.
20 NC N/A No connection.
21 vOE1# IN
Active low input for enabling output 1. This pin has an internal 120kohm pull-down.
1 =disable outputs, 0 = enable outputs
22 DIF2 OUT Differential true clock output.
23 DIF2# OUT Differential complementary clock output.
24 vOE2# IN
Active low input for enabling output 2. This pin has an internal 120kohm pull-down.
1 =disable outputs, 0 = enable outputs
25 VDDO1.5 PWR Power supply for outputs, nominally 1.5V.
26 VDDIO PWR Power supply for differential outputs
27 DIF3 OUT Differential true clock output.
28 DIF3# OUT Differential complementary clock output.
29 vOE3# IN
Active low input for enabling output 3. This pin has an internal 120kohm pull-down.
1 =disable outputs, 0 = enable outputs
30 NC N/A No connection.
31 VDD1.5 PWR Power supply, nominally 1.5V
32 VDDIO PWR Power supply for differential outputs
33 DIF4 OUT Differential true clock output.
34 DIF4# OUT Differential complementary clock output.
35 vOE4# IN
Active low input for enabling output 4. This pin has an internal 120kohm pull-down.
1 =disable outputs, 0 = enable outputs
36 DIF5 OUT Differential true clock output.
37 DIF5# OUT Differential complementary clock output.
38 vOE5# IN
Active low input for enabling output 5. This pin has an internal 120kohm pull-down.
1 =disable outputs, 0 = enable outputs
39 VDDIO PWR Power supply for differential outputs
40 ^CKPWRGD_PD# IN
Input notifies device to sample latched inputs and start up on first high assertion. Low enters
Power Down Mode, subsequent high assertions exit Power Down Mode. This pin has internal
120kohm pull-up resistor.
41 EPAD GND Connect paddle to ground.

9DBU0731AKLF

Mfr. #:
Manufacturer:
IDT
Description:
Clock Buffer 2 O/P 1.5V PCIE 45mW GEN1-2-3 Com Temp
Lifecycle:
New from this manufacturer.
Delivery:
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