ICS9DS400
IDT
TM
/ICS
TM
Four Output Differential Buffer for PCIe Gen 2 with Spread 1626 09/17/09
Four Output Differential Buffer for PCIe Gen 2 with Spread
Advance Information
1
General Description
Output Features
The 9DS400 is pin compatible to the 9DB403, but adds the
ability to inject spread spectrum onto the incoming differential
clock, while maintaining good phase noise.
4 - 0.7V current-mode differential output pairs.
Supports Spread Injection mode and fanout mode.
Two pin selectable down spread amounts: 0.5% and
0.25%.
50-110 MHz operation in PLL mode
50-400 MHz operation in Bypass mode
Functional Block Diagram
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
Features/Benefits
Bypass mode
Supports undriven differential outputs in PD# and
SRC_STOP# modes for power management.
Recommended Application
DB400 where spread spectrum needs to be added to the
incoming clock.
STOP
LOGIC
SRC_IN
SRC_IN#
DIF(6,5,2,1))
CONTROL
LOGIC
BYPASS#_SSCG
SDATA
SCLK
PD
Spread
Generating
PLL
4
IREF
OE(6,1)#
2
DIF_STOP
SPREAD_EN
M
U
X
Polarities shown assuming that OE_INV = 1
IDT
TM
/ICS
TM
Four Output Differential Buffer for PCIe Gen 2 with Spread 1626 09/17/09
ICS9DS400
Four Output Differential Buffer for PCIe for Gen 2 with Spread
2
Advance Information
Pin Configuration
Power Groups
VDD 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#
OE_1 8 21 OE_6
DIF_2 9 20 DIF_5
DIF_2# 10 19 DIF_5#
VDD 11 18 VDD
BYPASS#_SSCG 12 17 SPREAD_EN
SCLK 13 16 DIF_STOP#
SDATA 14 15 PD#
OE_INV = 0
ICS9DS400
VDD 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#_SSCG 12 17 SPREAD_EN
SCLK 13 16
DIF_STOP
SDATA 14 15
PD
OE_INV = 1
ICS9DS400
See Pin Description Table for pins w/internal pull up or pull down
See Pin Description Table for pins w/internal pull up or pull down
VDD GND
1 4 SRC_IN/SRC_IN#
5,11,18, 24 4 DIF(1,2,5,6)
N/A 27 IREF
28 27
Analog VDD &
GND for PLL core
Pin Number
Description
IDT
TM
/ICS
TM
Four Output Differential Buffer for PCIe Gen 2 with Spread 1626 09/17/09
ICS9DS400
Four Output Differential Buffer for PCIe for Gen 2 with Spread
3
Advance Information
Pin Description for OE_INV = 0
PIN # PIN NAME
PIN
TYPE
DESCRIPTION
INTERNAL
PULL UP
OR PULL
DOWN?
1 VDD PWR Power supply, nominal 3.3V N/A
2 SRC_IN IN 0.7 V Differential SRC TRUE input N/A
3 SRC_IN# IN 0.7 V Differential SRC COMPLEMENTARY input N/A
4 GND PWR Ground pin. N/A
5 VDD PWR Power supply, nominal 3.3V N/A
6 DIF_1 OUT 0.7V differential true clock output N/A
7 DIF_1# OUT 0.7V differential Complementary clock output N/A
8 OE_1 IN
Active high input for enabling output 1.
0 = tri-state outputs, 1= enable outputs
PULL UP
9 DIF_2 OUT 0.7V differential true clock output N/A
10 DIF_2# OUT 0.7V differential Complementary clock output N/A
11 VDD PWR Power supply, nominal 3.3V N/A
12 BYPASS#_SSCG IN
Input to select Bypass(fan-out) or SSCG (PLL) mode
0 = Bypass mode, 1= SSCG mode
PULL UP
13 SCLK IN Clock pin of SMBus circuitry, 5V tolerant. N/A
14 SDATA I/O Data pin for SMBus circuitry, 3.3V tolerant. N/A
15 PD# IN
Asynchronous active low input pin used to power down the device. The
internal clocks are disabled and the VCO and the crystal osc. (if any) are
stopped.
PULL UP
16 DIF_STOP# IN Active low input to stop differential output clocks. PULL UP
17 SPREAD_EN IN Asynchronous, active high input to enable spread spectrum functionality. PULL UP
18 VDD PWR Power supply, nominal 3.3V N/A
19 DIF_5# OUT 0.7V differential Complementary clock output N/A
20 DIF_5 OUT 0.7V differential true clock output N/A
21 OE_6 IN
Active high input for enabling output 6.
0 = tri-state outputs, 1= enable outputs
PULL UP
22 DIF_6# OUT 0.7V differential Complementary clock output N/A
23 DIF_6 OUT 0.7V differential true clock output N/A
24 VDD PWR Power supply, nominal 3.3V N/A
25 OE_INV IN
This latched input selects the polarity of the OE pins.
0 = OE pins active high, 1 = OE pins active low (OE#)
N/A
26 IREF OUT
This pin establishes the reference current for the differential current-mode
output pairs. This pin requires a fixed precision resistor tied to ground in order
to establish the appropriate current. 475 ohms is the standard value.
N/A
27 GNDA PWR Ground pin for the PLL core. N/A
28 VDDA PWR 3.3V power for the PLL core. N/A

9DS400AGLF

Mfr. #:
Manufacturer:
IDT
Description:
Clock Buffer PCIE SPREADING BUFFER
Lifecycle:
New from this manufacturer.
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