PI90LV024_04 PERICOM | Alldatasheet
Document overview
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- PDF pages: 12
Technical content
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: –40°C to 85°C
- Low V oltage Differential Signaling with Output V oltages of ±350mV into: – 100Ω load (PI90LV024) – 50Ω 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 func - tion 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 V oltage 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 100Ω 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 50Ω 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 PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch VCC 2DE GND 3DE 1DE GND 4DE VCC 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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Figure 1. Possible Signal Routing
- Setting nDE to 0 will set Ouput nY/nZ to High Impedance.
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
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Absolute Maximum Ratings Over Operating Free-Air Temperature(1) Recommended Operating Conditions Parameter Desctiption Min. Typ. Max. Units VCC Supply V oltage 3.0 3.3 3.6 V VIH High-Level Input V oltage S0 - S3, 1DE - 4DE VIL Low-Level Input V oltage 0.8 | VID | Magnitude of Differential Input 0.1 0.6 VIC Common-Mode Input V oltage (see fig 2) | VID | 2.4 - | VID | VCC -0.8 TA Operating Free-air temperature -40 85 °C Notes: 1. Stresses beyond those listed under "Absolute Maximum Ratings" may cause perma- nent 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 "Recom- mended Operating Conditions" is not implied. Exposure to Absolute-Maximum- Rated 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
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Figure 2. Common-Mode Input Voltage vs. Differential Voltage
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
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Receiver / Driver Electrical Characteristics Over Recommended Operating Conditions (unless otherwise noted) Symbol Parameter Test Conditions Min. Typ. Max Units VOD Differential Output V oltage Magnitude RL = 100Ω (LV024) See Fig. 3 247 440 590 mV∆VOD Change in Differential Output V oltage Mag- nitude between Logic States -50 50 VOC(SS) Steady-State Common-Mode Output V oltage RL = 100Ω (LVB024) See Fig. 4 1.062 1.375 V ∆VOC(SS) Change in Steady-State Common-Mode Output V oltage between Logic States -50 3 50 mV VOC(PP) Peak-to-peak common-mode output voltage 150 ICC Supply Current No Load 16 24 mARL = 100Ω (LV024) 26 40 RL = 50Ω (LVB024) 42 54 Both Channels Disabled 6 12 IH High-Level Input Current DE VIH = 5V 40 nA S1, S2, S3, S4 -3 µA IL Low-Level Input Current DE VIL = 0.8V -20 nA S1, S2, S3, S4 10 µA IOS Short Circuit Output Current VOY or VOZ = 0V -10 mAVOD = 0V -10 IOZ High-Impedance Output Current VOD = 600mV 1.5 ±25 nAVO - 0V or VCC 1.5 ±25 IO(OFF) Power-Off Output Current VCC - 0V , VO = 3.6V 1.5 ±40 CIN Input Capacitance 3 pFS0 - S3, 1DE - 4DE 8 Note: 1. All typical values are at 25°C and with a 3.3V supply
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
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Differential Receiver to Driver Switching Characteristics Over Recommended Operating Conditions (unless otherwise noted) Symbol Parameter Test Conditions Min. Typ. Max. Units tPLH Differential propagation delay, low-to-high CL = 10pF (see fig. 5) 4.0 6.0 ns tPHL Differential propagation delay, high-to-low 4.0 6.0 tsk(p) Pulse skew ( | tPHL - tPLH | ) 0.5 - tr Transistion, low-to-high LV024 1.0 1.5 LVB024 0.8 1.3 tf Transition, high-to-low LV024 1.0 1.5 LVB024 0.8 1.3 tPHZ Propagation delay time, high-level to high impedance output See fig. 6 4.0 10 tPLZ Propagation delat time, low-level to high impedance output 4.3 10 tPZH Propagation delat time, high-level to high impedance output 3.0 10 tPZL Propagation delat time, high-level to lowimpedance output 2.0 10 tPHL_R1_DX Channel-to-channel skew, receiver to driver(2) pstPLH_R1_DX 95 tPHL_R2_DX 95 tPLH_R2_DX 95 Notes: 1. All typical values are at 25°C and with a 3.3V supply 2. These parametric values are measured over supply voltage and temperature ranges recommended for the device
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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
- All input pulses are supplied by a generator having the following characteristics: tr or tf ≤ 1ns, pulse repetition rate (PRR) - 50 Mpps,
- CL includes instrumentation and fixture capacitance within 6mm of the D.U.T.
- The measurement of VOC(PP) is made on test equipment with a –3dB bandwidth of at least 300 MHz.
- All input pulses are supplied by a generator having the following characteristics: tr or tf ≤ 1ns, pulse repetition rate (PRR) - 50 Mpps, pulse
- CL includes instrumentation and fixture capacitance within 6mm of the D.U.T.
- The measurement of VOC(PP) is made on test equipment with a –3dB bandwidth of at least 300 MHz.
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Figure 5. Differential Receiver to Driver Propagation Delay and Driver Transition Time Waveforms
- All input pulses are supplies by a generator having the following characteristics: pulse repetition rate (PPR) = 50 Mpps, pulse
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Figure 6. Enable and Disable Timing Circuit
- All input pulses are supplies by a generator having the following characteristics: pulse repetition rate (PPR) = 0.5 Mpps, pulse
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
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PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
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.378 .386 .047 1.20 .002 .006 SEATING PLANE .0256 BSC .018 .030 .252 BSC .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 (Q) Packaging Mechanical: 28-Pin TSSOP (L) .386 .394 .053 .069 .004 .010 SEATING PLANE .025 BSC .007 .010 .228 .244 0.150 0.157 .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 1.270.101 0.254.008 .012 0.203 0.305 3.81 3.99 0.178 0.254 .033 0.84 .015 x 45˚ REF Detail A Detail A .008 0.20 MIN. Guage Plane .010 0.254 .041 1.04 REF .016 .035 0.41 0.89 0˚-6˚ .008 .013 0.20 0.33
PI90LV024, PI90LVB024 LVDS Dual 2x2 Crosspoint/Repeater Switch
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Ordering Information
Ordering Code Package Code Packaging Description PI90LV024Q Q 28-pin 150-mil SOIC PI90LV024QE Q Pb-free & Green, 28-pin 150-mil SOIC PI90LV024L L 28-pin 170-mil TSSOP PI90LV024LE L Pb-free & Green, 28-pin 170-mil TSSOP PI90LVB024Q Q 28-pin 150-mil SOIC PI90LVB024QE Q Pb-free & Green, 28-pin 150-mil SOIC PI90LVB024L L 28-pin 170-mil TSSOP PI90LVB024LE L Pb-free & Green, 28-pin 170-mil TSSOP Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com Notes: 1. Thermal Characteristics can be found on the company web site at www.pericom.com/packaging/