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PI90LV024, PI90LVB024
LVDS Dual 2x2 Crosspoint/Repeater Switch
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 load (PI90LV024) - 50 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 VCC 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 VCC less than 1.5V * TTL Inputs are 5V Tolerant * Power Dissipation at 400Mbit/s of 250mW * Packaging (Pb-free & Green Available): - 28-pin QSOP (Q) - 28-pin TSSOP (L)
Description
The PI90LV024 and PI90LVB024 are monolithic dual 2x2 asynchronous 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 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 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
S0/S1
1A/1B 1DE/2DE 1Y/1Z
Pin Configuration
1B 1A
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
VCC
1Y 1Z 2DE 2Z 2Y
S0
1DE
S1
2A/2B 2Y/2Z
2A 2B
GND
4B 4A
GND
3Y/3Z 3A/3B
4Y 4Z 4DE
S3
3DE
4Y/4Z 3DE/4DE
4A/4B
3Z 3Y
S2
3A 3B
S2/S3
VCC
1
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch MUX Truth Table
Input S3, S1 0 0 1 1 S2, S0 0 1 0 1
1Y/1Z 1A/1B 2A/2B 1A/1B 2A/2B
Output - 3Y/3Z - 3A/3B - 4A/4B - 3A/3B - 4A/4B
2Y/2Z 1A/1B 2A/2B 2A/2B 1A/1B
- 4Y/4Z - 3A/3B - 4A/4B - 4A/4B - 3A/3B
Function Splitter Splitter Router Router
Note: 1. Setting nDE to 0 will set Ouput nY/nZ to High Impedance.
S1/S0
1A/1B
1DE/2DE 1Y/1Z
Cross Point Router
2A/2B
2Y/2Z
3DE/4DE 3Y/3Z
S3/S2
3A/3B
Pass Through Router
4Y/4Z
4A /4B
Router Options S1/S0
1A/1B 1DE/2DE 1Y/1Z
Splitter A
2A/2B
2Y/2Z
3DE/4DE 3Y/3Z
S3/S2
3A/3B
Splitter B
4Y/4Z
4A/4B
Splitter Options
Figure 1. Possible Signal Routing
2
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch Absolute Maximum Ratings Over Operating Free-Air Temperature(1)
Supply Voltage Range, VCC(2)............................................................................. -0.5V to 4V Voltage Range (DE, S0, S1).....................................................................-0.5 to 6V Input Voltage Range, .......................................... VI (A or B)-0.5V to VCC + 0.5V Electrostatic Discharge: A, B, Y, Z, and GND(3)............... 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
Notes: 1. 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-MaximumRated conditions for extended periods may affect device reliability. 2. All voltage values, except differential I/O bus voltages, are with respect to ground terminal. 3. Tested in accordance with MIL-STD-883C Method 3015.7
Recommended Operating Conditions
Parameter VCC VIH VIL | VID | VIC TA Supply Voltage High-Level Input Voltage Low-Level Input Voltage Magnitude of Differential Input Common-Mode Input Voltage (see fig 2) Operating Free-air temperature S0 - S3, 1DE - 4DE Desctiption Min. 3.0 2 0.8 0.1 | VID | 2 -40 0.6 2.4 - | VID | 2 VCC -0.8 85 C V Typ. 3.3 Max. 3.6 Units
3
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
2.5
MAX at VCC > 3.15V
VIC - Common-Mode Input Voltage - V
2
MAX at VCC = 3V
1.5
1
0.5
MIN
0
0.1
0.2
0.3
0.4
0.5
0.6
VID - Differential Input Voltage - V
Figure 2. Common-Mode Input Voltage vs. Differential Voltage
Receiver Electrical Characteristics Over Recommended Operating Conditions (unless otherwise noted)
Symbol VITH+ VITHII II(OFF) Parameter Postive-going differential input voltage threshold Negative-going differential input voltage threshold Input Current (A or B inputs) Power-off Input current (A or B inputs) Test Conditions VCM = 1.2V VI = 0V VI = 2.4V VCC = 0V Min. -100 -2 -1.2 20 -20 A Typ. Max 100 Units mV
4
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch Receiver / Driver Electrical Characteristics Over Recommended Operating Conditions
(unless otherwise noted) Symbol VOD VOD VOC(SS) VOC(SS) VOC(PP) Parameter Differential Output Voltage Magnitude Change in Differential Output Voltage Magnitude between Logic States Steady-State Common-Mode Output Voltage Change in Steady-State Common-Mode Output Voltage between Logic States Peak-to-peak common-mode output voltage No Load ICC Supply Current RL = 100 (LV024) RL = 50 (LVB024) Both Channels Disabled IH IL IOS IOZ IO(OFF) CIN High-Level Input Current Low-Level Input Current Short Circuit Output Current High-Impedance Output Current Power-Off Output Current Input Capacitance DE S1, S2, S3, S4 DE S1, S2, S3, S4 VIH = 5V VIL = 0.8V VOY or VOZ = 0V VOD = 0V VOD = 600mV VO - 0V or VCC VCC - 0V, VO = 3.6V S0 - S3, 1DE - 4DE 1.5 1.5 1.5 3 8 16 26 42 6 RL = 100 (LVB024) See Fig. 4 Test Conditions RL = 100 (LV024) See Fig. 3 Min. 247 -50 1.062 -50 3 Typ. 440 Max 590 50 1.375 50 150 24 40 54 12 40 -3 -20 10 -10 -10 25 25 40 pF nA nA A nA A mA mA mV V mV Units
Note: 1. All typical values are at 25C and with a 3.3V supply
5
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch Differential Receiver to Driver Switching Characteristics Over Recommended Operating Conditions
(unless otherwise noted) Symbol tPLH tPHL tsk(p) tr tf tPHZ tPLZ tPZH tPZL tPHL_R1_DX tPLH_R1_DX tPHL_R2_DX tPLH_R2_DX
Notes: 1. All typical values are at 25C and with a 3.3V supply 2. These parametric values are measured over supply voltage and temperature ranges recommended for the device
Parameter Differential propagation delay, low-to-high Differential propagation delay, high-to-low Pulse skew ( | tPHL - tPLH | ) Transistion, low-to-high Transition, high-to-low LV024 LVB024 LV024 LVB024
Test Conditions
Min.
Typ. 4.0 4.0 0.5 1.0 0.8 1.0 0.8 4.0 4.3 3.0 2.0 95 95 95 95
Max. 6.0 6.0 1.5 1.3 1.5 1.3 10 10 10 10
Units
CL = 10pF (see fig. 5)
ns
Propagation delay time, high-level to high impedance output Propagation delat time, low-level to high impedance output Propagation delat time, high-level to high impedance output Propagation delat time, high-level to lowimpedance output Channel-to-channel skew, receiver to driver(2) See fig. 6
ps
6
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch Parameter Measurement Information

Notes: 1. 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. 2. RL = 100 or 50 1%. 3. CL includes instrumentation and fixture capacitance within 6mm of the D.U.T. 4. The measurement of VOC(PP) is made on test equipment with a -3dB bandwidth of at least 300 MHz.
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
Notes: 1. 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. 2. RL = 100 or 50 1%. 3. CL includes instrumentation and fixture capacitance within 6mm of the D.U.T. 4. The measurement of VOC(PP) is made on test equipment with a -3dB bandwidth of at least 300 MHz.
7
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch

Figure 5. Differential Receiver to Driver Propagation Delay and Driver Transition Time Waveforms
Notes: 1. RL = 100 or 50 1% 2. All input pulses are supplies by a generator having the following characteristics: pulse repetition rate (PPR) = 50 Mpps, pulse width = 10 0.2ns.
8
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch

Notes: 1. RL = 100 or 50 1% 2. All input pulses are supplies by a generator having the following characteristics: pulse repetition rate (PPR) = 0.5 Mpps, pulse width = 500 10ns.
Figure 6. Enable and Disable Timing Circuit
9
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Typical Characteristics

Figure 7

Figure 8

Figure 9

Figure 10
10
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch Packaging Mechanical: 28-Pin QSOP (Q)
28
.008 0.20 MIN.
0.150 0.157
3.81 3.99
.008 .013 0.20 0.33
Guage Plane
.010 0.254
1
Detail A
.016 .035 0.41 0.89
.041 1.04 REF
0-6
.386 9.804 .394 10.009
.033 REF 0.84
1.35 .053 1.75 .069
.015 x 45
Detail A
SEATING PLANE
0.41 .016 1.27 .050
.007 0.178 .010 0.254
.025 BSC 0.635
.008 0.203 .012 0.305
.004 0.101 .010 0.254
.228 .244 5.79 6.19
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Packaging Mechanical: 28-Pin TSSOP (L)
28
.169 .177
4.3 4.5
.004 .008
0.09 0.20
1
.378 .386 9.6 9.8
0.45 .018 0.75 .030
.252 BSC 6.4
SEATING PLANE
.047 1.20 Max
X.XX DENOTES CONTROLLING X.XX DIMENSIONS IN MILLIMETERS
.0256 BSC 0.65
.007 .012 0.19 0.30
.002 .006
0.05 0.15
11
PS8486B
08/19/04
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Ordering Information
Ordering Code PI90LV024Q PI90LV024QE PI90LV024L PI90LV024LE PI90LVB024Q PI90LVB024QE PI90LVB024L PI90LVB024LE Package Code Q Q L L Q Q L L Packaging Description 28-pin 150-mil SOIC Pb-free & Green, 28-pin 150-mil SOIC 28-pin 170-mil TSSOP Pb-free & Green, 28-pin 170-mil TSSOP 28-pin 150-mil SOIC Pb-free & Green, 28-pin 150-mil SOIC 28-pin 170-mil TSSOP Pb-free & Green, 28-pin 170-mil TSSOP
Notes: 1. Thermal Characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com
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PS8486B 08/19/04

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