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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
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 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 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 * Available Packaging: 28-pin QSOP, 28-pin TSSOP
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 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
S0/S1 1A/1B 1DE/2DE 1Y/1Z
Pin Configuration
1B 1A S0 1DE S1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 22 21 20 19 18 17 16 15 VCC 1Y 1Z 2DE 2Z 2Y GND 4B 4A S3 3DE S2 3A 3B
2A/2B
2Y/2Z
2A 2B GND 4Y 4Z 4DE 3Z 3Y VCC
28-Pin L,Q 23
3Y/3Z
3A/3B
4Y/4Z 3DE/4DE
4A/4B S2/S3
1
PS8486A
03/27/01
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PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Table 1. MUX Truth Table
Input S 3,S 1 0 0 1 1 S 2,S 0 0 1 0 1 1Y/1Z-3Y/3Z 1A/1B - 3A/3B 2A/2B - 4A/4B 1A/1B - 3A/3B 2A/2B - 4A/4B Output 2Y/2Z-4Y/4Z 1A/1B - 3A/3B 2A/2B - 4A/4B 2A/2B - 4A/4B 1A/1B - 3A/3B Function Splitter Splitter Router Router
Note: 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
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PS8486A 03/27/01
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PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Absolute Maximum Ratings Over Operating Free-Air Temperature
Supply Voltage Range, VCC(1) .................................................................................. -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(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 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 extended periods may affect device reliability. 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
Recommended Operating Conditions
M in. Supply Voltage, VCC High- Level Input Voltage, VIH S0- S3, 1DE- 4DE Low- Level Input Voltage, VIL Magnitude of Differential Input Voltage VID 0.1 VID Common- Mode input Voltage, VIC (see Figure 2) 2
2.4 -
Nom. 3.3
M ax. 3.6
Units
3.0 2
0.8 0.6 VID 2 VCC -0.8 V
Operating free- air temperature, TA
-4 0
85
C
3
PS8486A
03/27/01
VIC - Common-Mode Input Voltage - V
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PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
2.5 MAX at VCC > 3.15V
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+ VITH- II II (OFF) Parame te r Positive- going differential input voltage threshold VCM = 1.2V Negative- going differential input voltage threshold VI = 0V Input current (A or B inputs) VI = 2.4V Power- off input current (A or B inputs) VCC = 0V -1.2 20 -100 -2 -20 A Te s t Conditions M in. Typ.(1) M ax. 100 mV Units
4
PS8486A
03/27/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
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) Parame te r 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 Ohm (LV024) RL = 50 Ohm (LVB024) Both Channels Disabled IH IIL High- level input current DE S1, S2, S3, S4 DE S1, S2, S3, S4 VIH = 5 VIL = 0.8V VOY or VOZ = 0V, VOD = 0V (LV024) IOS Short- circuit output current VOY or VOZ = 0V, VOD = 0V (LVB024) IOZ IO(OFF) CIN High- Impedence output current Power- off output current Input capacitance VOD = 600mV VO = 0V or VCC VCC = 0V, VO = 3.6V S0- S3, 1DE- 40DE 1.5 1.5 1.5 3 8 16 26 42 6 RL = 50 Ohm (LVB024) See Fig. 4 RL = 100 Ohm (LV024) Te s t Conditions See Fig. 3 M in. 247 -50 1.125 -50 3 Typ.(1) 440 M ax. 590 50 1. 3 7 5 50 150 24 40 54 12 40 -3 -20 10 -10 -10 -10 -10 25 25 40 pF pF nA mA nA A nA A mA mV V mV Units
Low- level input current
Note: 1. All typical values are at 25C and with a 3.3 supply
5
PS8486A
03/27/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
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 tr tf tf tPHZ tPLZ tPZH tPZL tPHL_R1_Dx tPLH_R1_Dx tPHL_R2_Dx tPLH_R2_Dx
Parame te r Differential propagation delay, low- to- high Differential propagation delay, high- to- low Pulse skew (tPHL - tPLH) Transition, low- to- high Transition, low- to- high Transition, high- to- low Transition, high- to- low PI90LV024 PI90LVB024 PI90LV024 PI90LVB024
Te s t Conditions
M in.
Typ.(1) 4.0 4.0 0.5
M ax. 6.0 6.0 - 1.5 1.3 1.5 1.3 10 10 10 10
Units
CL = 10pF (See Fig. 5)
1.0 0.8 1. 0 0.8 4.0 4.3
ns
Propagation delay time, high- level- to- high- impedence output Propagation delay time, low- level- to- high- impedence output (See Fig. 6) Propagation delay time, high- impedence- to- high- level output Propagation delay time, high- impedence- to- low- level output
3.0 2.0 95
Channel- to- channel skew, receiver to driver(2)
95 95 95
ps
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
6
PS8486A
03/27/01
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PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Parameter Measurement Information
DE A Pulse Generator B R Input (see Note A) D Z Y VOD RL (see Note B)
CL = 10 pF (2 Places) (see Note C)
VI(B) VI(A)
1.4 V 1V VOD 0
100% 80%
20% 0% tf tr
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. RL = 100 or 50 1%. C. CL includes instrumentation and fixture capacitance within 6mm of the D.U.T. D. 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
DE A Pulse Generator R B Input (see Note A) Z Y D
RL (see Note B) (2 Places)
VI(B) VI(A) VOC(PP) (see Note D)
1.4 V 1V
VOC CL = 10 pF (2 Places) (see Note C)
VOC(SS)
VCC
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. RL = 100 or 50 1%. C. CL includes instrumentation and fixture capacitance within 6mm of the D.U.T. D. The measurement of VOC(PP) is made on test equipment with a -3dB bandwidth of at least 300 MHz.
Figure 4. Test Circuit and Definitions for the Driver Common-Mode Output Voltage
7
PS8486A
03/27/01
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DE A Pulse Generator B R D Z 10 pF 10 pF Y RL (see Note A) VIB 0-V Differential VIA tPLH VOZ 0-V Differential VOY 1.2-V CM 1V tPHL 1.4 V 1.2-V CM 1V 1.4 V VOY - VOZ 80% 0-V Differential 20%
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
tr
tf
Notes: A. RL = 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.
Figure 5. Differential Receiver to Driver Propagation Delay and Driver Transition Time Waveforms
8
PS8486A
03/27/01
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DE 1 V or 1.4 V A R 1.2 V B Y D Z RL/2 (see Note A) 1.2 V RL/2 (see Note A) 2V DE 1.4 V 0.8 V tPZH VOY or VOZ tPHZ 1.4 V 1.25 V 1.2 V tPZL tPLZ 1.2 V VOY or VOZ Notes: 1.15 V 1 V 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.
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Figure 6. Enable and Disable Timing Circuit
9
PS8486A
03/27/01
V OH - High-Level Ouptut Voltage - V
3 2.5
V OL - Low-Level Output Voltage - V
V OH - High-Level Output Voltage - V
V OL - Low-Level Output Voltage - V
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Typical Characteristics
PI90LV024 PI90LV024
HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT
3.5 VCC = 3.3 V TA = 25C 4
LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT
VCC = 3.3 V TA = 25C 3
2 1.5 1 .5 0 -4 -3 -2 -1 0 IOH - High-Level Output Current - mA
2
1
0 0 2 4 6 IOL - Low-Level Output Current - mA
Figure 7
PI90LVB024
Figure 8
PI90LVB024
HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT
3.5 VCC = 3.3 V TA = 25C 3 2.5 4
LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT
VCC = 3.3 V TA = 25C 3
2 1.5 1 .5 0 -8 -6 -4 -2 0 IOH - High-Level Output Current - mA
2
1
0 0 2 4 6 8 10 12 IOL - Low-Level Output Current - mA
Figure 9
Figure 10
10
PS8486A
03/27/01
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PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Packaging Mechanical: 28-Pin QSOP
28
0.150 0.157
3.81 3.99 .015 x 45
1 .386 9.804 .394 10.009 0.41 .016 1.27 .050 .033 REF 0.84 1.35 .053 1.75 .069 SEATING PLANE .228 .244 5.79 6.19
.007 0.178 .010 0.254
.025 BSC 0.635
.008 0.203 .012 0.305
.004 0.101 .010 0.254
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Packaging Mechanical: 28-Pin TSSOP
28
.169 .177
4.3 4.5
1 .378 .386 9.6 9.8 .047 1.20 Max SEATING PLANE 0.45 0.75 .018 .030 .004 .008 0.09 0.20
.252 BSC 6.4
.0256 BSC 0.65
.007 .012 0.19 0.30
.002 .006
0.05 0.15
X.XX DENOTES CONTROLLING X.XX DIMENSIONS IN MILLIMETERS
11
PS8486A
03/27/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
Ordering Information
Orde ring Code PI90LV024Q PI90LV024L PI90LVB024Q PI90LVB024L Package Name Q 28 L28 Q 28 L28 Package Type 28- pin 150- mil SOIC 28- pin 170- mil TSSOP -40C to 85C 28- pin 150- mil SOIC 28- pin 170- mil TSSOP Ope rating Range
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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PS8486A 03/27/01

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