1
PS8486A 03/27/01
Features
Dual 2x2 Crosspoint/Repeater Switch
Meets or Exceeds the Requirements of ANSI TIA/
EIA-644-1995
Designed for Signaling Rates up to 650 Mbit/s (325 MHz)
Operates from a 3.3V Supply: 40C to 85C
Low Voltage Differential Signaling with Output Voltages
of 350mV into:
100 Ohm load (PI90LV024)
50 Ohm load Bus LVDS Signaling (PI90LVB024)
Accepts 350mV differential inputs
Wide common mode input range: 0.2V to 2.7V
Output drivers are high impedance when disabled or when
V
CC
1.5V
Inputs are open, short, and terminated fail safe
Propagation Delay Time: 3.5ns
ESD protection is 10kV on bus pins
Bus Pins are High Impedance when disabled or with
V
CC
less than 1.5V
TTL Inputs are 5V Tolerant
Power Dissipation at 400Mbit/s of 250mW
Available Packaging: 28-pin QSOP, 28-pin TSSOP
Description
The PI90LV024 and PI90LVB024 are monolithic dual 2x2 asynch-
ronous crosspoint/repeater switches. The crosspoint function is
based on a multiplexer tree architecture. Each 2x2 switch can be
considered as a pair of 2:1 multiplexers that share the same inputs.
The signal path through each switch is fully differential with minimal
propagation delay. The signal path is unregistered, so no clock is
required for the data inputs. The signal line drivers and receivers use
Low Voltage Differential Signaling (LVDS) to achieve signaling
rates as high as 650 Mbps.
The LVDS standard provides a minimum differential output voltage
magnitude of 247mV into a 100 Ohm load and receipt of 100mV
signals with up to 1V of ground potential difference between a
transmitter and receiver. The PI90LVB024 doubles the output drive
current to achieve Bus LVDS signaling levels with a 50 Ohm load.
The intended application of these devices is for loop-through and
redundant channel switching for both point-to-point base-band
(PI90LV024) and multipoint (PI90LVB024) data transmissions over
controlled impedance media. The package pin assignments enables
easy routing for applications requiring signal feedback.
Block Diagram
Pin Configuration
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
CC
1Y
1Z
2DE
2Z
2Y
GND
4B
4A
S3
3DE
S2
3A
3B
1B
1A
S0
1DE
S1
2A
2B
GND
4Y
4Z
4DE
3Z
3Y
V
CC
28-Pin
L,Q
1DE/2DE
1Y/1Z
2Y/2Z
4A/4B
3A/3B
S2/S3
S0/S1
1A/1B
2A/2B
4Y/4Z
3Y/3Z
3DE/4DE
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
2
PS8486A 03/27/01
Figure 1. Possible Signal Routing
Table 1. MUX Truth Table
S1/S0
1A/1B
2A/2B
3DE/4DE
3Y/3Z
4Y/4Z
1DE/2DE
1Y/1Z
2Y/2Z
S3/S2
3A/3B
4A / 4B
Cross Point
Router
Pass Through
Router
S1/S0
1A/1B
2A/2B
3DE/4DE
3Y/3Z
4Y/4Z
1DE/2DE
1Y/1Z
2Y/2Z
S3/S2
3A/3B
4A/4B
Splitter A
Splitter B
Splitter Options
Router Options
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2
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3
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Y
3
-
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1
/
Y
1
Z
4
/
Y
4
-
Z
2
/
Y
2
0
0
B
3
/
A
3
-
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1
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1
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3
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3
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1
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2
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2
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3
-
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1
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A
1
r
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o
R
Note: Setting nDE to 0 will set Ouput nY/nZ to High Impedance.
3
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
PS8486A 03/27/01
Supply Voltage Range, V
CC
(1)
..................................................................................
0.5V to 4V
Voltage Range (DE, S0, S1) ......................................................................... 0.5 to 6V
Input Voltage Range, V
I
(A or B) ................................................. 0.5V to V
CC
+ 0.5V
Electrostatic Discharge: A, B, Y, Z, and GND
(2)
........................
Class 3, A: 16kV, B:600V
All Pins ................................................ Class 3, A: 7kV, B:500V
Storage Temperature Range ................................................................ 65C to 150C
Lead Temperature 1, 6 mm (1/16 inch) from case for 10 seconds ........................ 260C
Absolute Maximum Ratings Over Operating Free-Air Temperature
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent
damage to the device. These are stress ratings only, and functional operation of the device
at these or any other conditions beyond those indicated under "Recommended Operating
Conditions" is not implied. Exposure to Absolute-Maximum-Rated conditions for ex-
tended periods may affect device reliability.
Recommended Operating Conditions
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2.4
Notes:
1. All voltage values, except differential I/O bus voltages, are with respect to ground terminal.
2. Tested in accordance with MIL-STD-883C Method 3015.7
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
4
PS8486A 03/27/01
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2
Receiver Electrical Characteristics Over Recommended Operating Conditions
(unless otherwise noted)
Figure 2. Common-Mode Input Voltage vs. Differential Voltage
2.5
2
1.5
1
0.5
0
0.1
0.2
0.3
0.4
0.5
0.6
MAX at V
CC
> 3.15V
MAX at V
CC
= 3V
MIN
VID Differential Input Voltage V
V
IC
Common-Mode Input
V
olta
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5
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
PS8486A 03/27/01
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Receiver / Driver Electrical Characteristics Over Recommended Operating Conditions
(unless otherwise noted)
Note:
1. All typical values are at 25C and with a 3.3 supply
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
6
PS8486A 03/27/01
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9
Differential Receiver to Driver Switching Characteristics Over Recommended Operating Conditions
(unless otherwise noted)
Notes:
1. All typical values are at 25C and with a 3.3 supply
2. These parametric values are measured over supply voltage and temperature ranges recommended for the device
7
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
PS8486A 03/27/01
Parameter Measurement Information
Figure 3. Test Circuit and Voltage Definitions for the Differential Output Signal
Figure 4. Test Circuit and Definitions for the Driver Common-Mode Output Voltage
Y
Z
VOD
Input
(see Note A)
CL = 10 pF
(2 Places)
(see Note C)
RL (see Note B)
100%
80%
20%
0%
VOD
0
tf
tr
VI(B)
VI(A)
1.4 V
1 V
A
Pulse
Generator
B
R
D
DE
Notes: A. All input pulses are supplied by a generator having the following characteristics: tr or tf
1ns, pulse repetition rate (PRR) - 50 Mpps,
pulse width = 10 0.2ns.
B. R
L
= 100
or 50
1%.
C. C
L
includes instrumentation and fixture capacitance within 6mm of the D.U.T.
D. The measurement of V
OC(PP)
is made on test equipment with a 3dB bandwidth of at least 300 MHz.
Y
Z
Input
(see Note A)
CL = 10 pF
(2 Places)
(see Note C)
VOC
A
VCC
VOC(PP)
(see Note D)
VOC(SS)
VI(B)
VI(A)
Pulse
Generator
DE
B
R
D
1.4 V
1 V
RL (see Note B)
(2 Places)
Notes: A. All input pulses are supplied by a generator having the following characteristics: tr or tf
1ns, pulse repetition rate (PRR) - 50 Mpps,
pulse width = 10 0.2ns.
B. R
L
= 100
or 50
1%.
C. C
L
includes instrumentation and fixture capacitance within 6mm of the D.U.T.
D. The measurement of V
OC(PP)
is made on test equipment with a 3dB bandwidth of at least 300 MHz.
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
8
PS8486A 03/27/01
Figure 5. Differential Receiver to Driver Propagation Delay and Driver Transition Time Waveforms
R
D
10 pF
Pulse
Generator
80%
20%
0-V Differential
VOY VOZ
VIB
VIA
1.4 V
1 V
tPLH
tPHL
tr
tf
A
B
10 pF
VOZ
VOY
1.4 V
1 V
0-V Differential
0-V Differential
1.2-V CM
1.2-V CM
DE
RL (see Note A)
Y
Z
Notes: A. R
L
= 100
or 50
1%
B. All input pulses are supplies by a generator having the following characteristics:
pulse repetition rate (PPR) = 50 Mpps, pulse width = 10 0.2ns.
9
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
PS8486A 03/27/01
Figure 6. Enable and Disable Timing Circuit
A
B
R
D
Y
Z
DE
1.2 V
RL/2
(see Note A)
RL/2
(see Note A)
2 V
1.4 V
0.8 V
1.2 V
1.15 V
1 V
1.4 V
1.25 V
1.2 V
tPZH
tPHZ
tPZL
tPLZ
DE
1.2 V
1 V or 1.4 V
VOY or VOZ
VOY or VOZ
Notes:
A. RL = 100
or 50
1%
B. All input pulses are supplied by a generator having the following characteristics: pulse repetition rate (PRR) = 0.5 Mpps,
pulse width = 500
10ns.
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
1 0
PS8486A 03/27/01
IOH High-Level Output Current mA
PI90LV024
PI90LVB024
PI90LVB024
PI90LV024
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
1
.5
0
2
1
3
4
1.5
VCC = 3.3 V
TA = 25
C
2
2.5
0
3
V
OH
High-Le
vel
Ouptut V
o
lta
g
e
V
3.5
IOL Low-Level Output Current mA
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
1
0
4
0
2
VCC = 3.3 V
TA = 25
C
3
6
2
V
OL
Lo
w-Le
vel
Output V
olta
g
e
V
4
IOH High-Level Output Current mA
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
1
.5
0
4
2
3
8
1.5
VCC = 3.3 V
TA = 25
C
2
2.5
0
6
V
OH
High-Le
vel
Output V
o
lta
g
e
V
3.5
IOL Low-Level Output Current mA
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
1
0
8
0
2
VCC = 3.3 V
TA = 25
C
3
12
4
V
OL
Lo
w-Le
vel
Output V
o
lta
g
e
V
4
6
10
2
Typical Characteristics
Figure 7
Figure 8
Figure 9
Figure 10
1 1
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
PS8486A 03/27/01
.378
.386
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.252
BSC
1
28
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
9.6
9.8
0.65
0.19
0.30
.007
.012
.004
.008
Max
Packaging Mechanical: 28-Pin QSOP
Packaging Mechanical: 28-Pin TSSOP
.386
.394
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
0.150
0.157
1
28
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
9.804
10.009
1.35
1.75
5.79
6.19
0.41
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.033
0.84
.015 x 45
REF
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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
1 2
PS8486A 03/27/01
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
Ordering Information
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