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Renesas Electronics Components Datasheet

9DB423B Datasheet

4-OUTPUT DIFFERENTIAL BUFFER

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4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI
DATASHEET
ICS9DB423
General Description
The ICS9DB423B is compatible with the Intel DB400Q
Differential Buffer Specification. This buffer provides 4
PCI-Express SRC or 4 QPI clocks. The ICS9DB423B is
driven by a differential output pair from a CK410B+ or
CK509B main clock generator.
Recommended Application
DB400Q compatible part with PCIe Gen1, Gen 2 and QPI
support
Key Specifications
Output cycle-cycle jitter < 50ps
Output to Output skew <50ps
Phase jitter: PCIe Gen1 < 86ps peak to peak
Phase jitter: PCIe Gen2 < 3.0/3.1ps rms
Phase jitter: QPI < 0.5ps rms
Functional Block Diagram
2
OE(6,1)
Features/Benefits
Spread spectrum modulation tolerant, 0 to -0.5% down
spread and +/- 0.25% center spread
Supports undriven differential outputs in Power Down
and DIF_STOP# for modes for power management.
Output Features
4 - 0.7V current-mode differential output pairs
Supports zero delay buffer mode and fanout mode
Bandwidth programming available
50-133 MHz operation in PLL mode
33-400 MHz operation in Bypass mode
SRC_IN
SRC_IN#
SPREAD
COMPATIBLE
PLL
M
U
X
4
STOP
LOGIC
DIF(6,5,2,1)
PD
BYPASS#_133_100
SDATA
SCLK
CONTROL
LOGIC
IREF
IDT® 4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI
1
ICS9DB423B
REV E 091812


Renesas Electronics Components Datasheet

9DB423B Datasheet

4-OUTPUT DIFFERENTIAL BUFFER

No Preview Available !

ICS9DB423B
4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI
Pin Configuration
VDDR 1
SRC_IN 2
SRC_IN# 3
GND 4
VDD 5
DIF_1 6
DIF_1# 7
OE_1 8
DIF_2 9
DIF_2# 10
VDD 11
BYPASS#_133_100 12
SCLK 13
SDATA 14
28 VDDA
27 GNDA
26 IREF
25 OE_INV
24 VDD
23 DIF_6
22 DIF_6#
21 OE_6
20 DIF_5
19 DIF_5#
18 VDD
17 HIGH_BW#
16 DIF_STOP#
15 PD#
OE_INV = 0
VDDR 1
28 VDDA
SRC_IN 2
27 GNDA
SRC_IN# 3
26 IREF
GND 4
25 OE_INV
VDD 5
24 VDD
DIF_1 6
23 DIF_6
DIF_1# 7
22 DIF_6#
OE1# 8
21 OE6#
DIF_2 9
20 DIF_5
DIF_2# 10
19 DIF_5#
VDD 11
18 VDD
BYPASS#_133_100 12
17 HIGH_BW#
SCLK 13
16 DIF_STOP
SDATA 14
15 PD#
OE_INV = 1
Note: Pin 15 is always active low. This is different
than 9DB403.
28-pin SSOP and TSSOP
Polarity Inversion Pin List Table
Pins
8
15
16
Various
OE_INV
0
1
OE_1
OE1#
PD#
PD#
DIF_STOP# DIF_STOP
OE_x
OE_x#
Power Groups
Pin Number
VDD
GND
1
4
5,11,18, 24
4
N/A
27
28
27
Description
SRC_IN/SRC_IN#
DIF(1,2,5,6)
IREF
Analog VDD & GND for PLL core
Frequency Selection
BYPASS#_133_100
Low
Mid
High
Bypass Readback Table
BYPASS#_133_100
Low
Mid
High
Voltage
MODE
<0.8V
Bypass
1.2<Vin<1.8V QPI 133MHz
Vin > 2.0V PCIe 100MHz
Byte0, bit 3
0
1
0
Byte 0 bit 1
0
0
1
IDT® 4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI
2
ICS9DB423B
REV E 091812


Part Number 9DB423B
Description 4-OUTPUT DIFFERENTIAL BUFFER
Maker Renesas
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9DB423B Datasheet PDF






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