PI2PCIE412-D
Enhanced, 1.8V, PCI Express Compliant,
4-Differential Channel, 2:1 Mux/DeMux Switch,
w/ Single Enable
Features
•
•
•
•
•
•
•
•
•
4 Differential Channel, 2:1 Mux/DeMux
PCI Express signal compliance
Low Bit-to-Bit Skew , 10ps max (between '+' and '-' bits)
Low Crosstalk: -65dB@10 MHz
Low Off Isolation: -65dB@10 MHz
V
CC
Operating Range: +1.5V to +2.0V
ESD Tolerance: 8kV HBM I/O; 2kV HBM select pin
Low channel-to-channel skew, 35ps max
Packaging (Pb-free & Green):
– 42-contact, TQFN (ZH42)
Description
Pericom Semiconductor’s PI2PCIE412-D is an 8 to 4 differential
channel multiplexer/demultiplexer switch. This solution can
switch 2 full PCI Express lanes to one of two locations. Using
a unique design technique, Pericom has been able to minimize
the impedance of the switch such that the attenuation observed
through the switch is negligible. The unique design technique
also offers a layout targeted for PCI Express signals, which
minimizes the channel to channel skew as well as channel to
channel crosstalk as required by the PCI Express specification.
Application
Switch a PCI-Express lane output between two PCI Express lane
inputs.
Block Diagram
A
0
A
1
A
2
A
3
0
B
1
1
B
1
2
B
1
Pin Description
V
DD
GND
V
DD
GND
42 41 40 39
3B
1
0
B
2
1
B
2
2
B
2
3
B
2
4
B
1
5
B
1
6
B
1
7
B
1
4
B
2
5
B
2
6
B
2
7
B
2
A
4
A
5
A
6
A
7
SEL
GND
A
0
A
1
GND
V
DD
A
2
A
3
V
DD
SEL
GND
A
4
A
5
V
DD
GND
A
6
A
7
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
GND
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
0
B
1
1
B
1
2
B
1
3
B
1
0
B
2
1
B
2
2
B
2
3
B
2
V
DD
4
B
1
5
B
1
6
B
1
7
B
1
4
B
2
5
B
2
6
B
2
7
B
2
Function
A
N
to
N
B
1
A
N
to
N
B
2
SEL
L
H
1
V
DD
GND
V
DD
GND
Truth Table
18 19 20 21
PS8788B
01/23/06
PI2PCIE412-D
Enhanced, 1.8V, PCI Express Compliant,
4-Differential Channel, 2:1 Mux/DeMux Switch
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ....................................................–65°C to +150°C
Supply Voltage to Ground Potential ................................–0.5V to +2.5V
DC Input Voltage ...............................................................–0.5V to V
CC
DC Output Current ....................................................................... 120mA
Power Dissipation ........................................................................... 0.5W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device. This
is a stress rating only and functional operation of the device
at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Expo-
sure to absolute maximum rating conditions for extended
periods may affect reliability.
DC Electrical Characteristics for Switching over Operating Range
(T
A
= –40°C to +85°C, V
CC
= 1.5V to 2.0V)
Paramenter
VIH
VIL
VIK
IIH
IIL
Description
Input HIGH Voltage
Input LOW Voltage
Clamp Diode Voltage
Input HIGH Current
Input LOW Current
Test Conditions
(1)
Min
0.65 x V
CC
–0.5
–0.7
0.35 x V
CC
–1.2
±5
±5
µA
V
Typ
(2)
Max
Units
Guaranteed HIGH level
Guaranteed LOW level
V
CC
= Max., I
IN
= –18mA
V
CC
= Max., V
IN
= V
CC
V
CC
= Max., V
IN
= GND
Power Supply Characteristics
Parameters
I
CC
Description
Quiescent Power Supply Current
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or V
CC
Min.
Typ.
(2)
200
Max.
Units
µA
Dynamic Electrical Characteristics Over the Operating Range
(TA= -40º to +85ºC, VCC = 1.8V±10%, GND=0V)
Parameter
X
TALK
O
IRR
Description
Crosstalk
OFF Isolation
Test Conditions
See Fig. 1 for Measurement Setup, f = 10 MHz
See Fig. 2 for Measurement Setup, f = 10 MHz
Min.
Typ.
(2)
-65
-65
Max.
Units
dB
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 1.8V,
T
A
= 25°C ambient and maximum loading.
2
PS8788B
01/23/06
PI2PCIE412-D
Enhanced, 1.8V, PCI Express Compliant,
4-Differential Channel, 2:1 Mux/DeMux Switch
½½½½½½½
½
½½½½½½½½
½½½½½½
½½½½½½
½½½½½½
½
½½½½½½½½½½½½
½½½
½½½½½
½
½½½
½½½½
Fig 1. Crosstalk Setup
½½½½½½½
½
½½½½½½½½
½½½½½½
½½½½½½
½½½½½½
½½½
½½½½
½
½
½½½½½½½½½½½½
Fig 2. Off-isolation setup
3
PS8788B
01/23/06
PI2PCIE412-D
Enhanced, 1.8V, PCI Express Compliant,
4-Differential Channel, 2:1 Mux/DeMux Switch
Fig 3. Crosstalk
Fig 4. Off Isolation
4
PS8788B
01/23/06
PI2PCIE412-D
Enhanced, 1.8V, PCI Express Compliant,
4-Differential Channel, 2:1 Mux/DeMux Switch
Switching Characteristics
(TA= -40º to +85ºC, VCC = 1.8V±10%)
Paramenter
tPZH, tPZL
tPHZ, tPLZ
tb-b
tch-ch
Description
Line Enable Time - SEL to AN, BN
Line Disable Time - SEL to AN, BN
Bit-to-bit skew within the same differential pair
Channel-to-channel skew
Min.
0.5
0.5
Max.
8.0
4.0
10
35
Units
ns
ps
ps
Test Circuit for Electrical Characteristics
(1-5)
2 x V
CC
V
CC
200-ohm
Pulse
Generator
V
IN
R
T
D.U.T
V
OUT
4pF
C
L
200-ohm
Notes:
1. C
L
= Load capacitance: includes jig and probe capacitance.
2. R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator
3. Output 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
output 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
4. All input impulses are supplied by generators having the following characteristics: PRR ≤ MHz, Z
O
= 50Ω, t
R
≤ 2.5ns, t
F
≤ 2.5ns.
5. The outputs are measured one at a time with one transition per measurement.
Switching Waveforms
½½½
½
½½
½½
½
½½
½
½½
½½
½½½
½½½½
½½½½½½½½
½½½½
½
½½½½½
½½½½
½½½½
½
½½½
½½½½½½½
½½½½
½½½
½½½
½½½½
½
½½½½½
½½½½½½½½
½
½½½
½½½½½½½
Voltage Waveforms Enable and Disable Times
Switch Positions
Test
t
PLZ
, t
PZL
(output on B-side)
t
PHZ
, t
PZH
(output on B-side)
Prop Delay
Switch
2 x V
CC
GND
Open
5
PS8788B
01/23/06
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