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| PI3VT3245 8-Bit, 2-Port, Low Voltage Translator Bus Switch Features * * * * * Near-Zero propagation delay Low On-Resistance switches connect inputs to outputs 2.5V to 3.3V Supply voltage operation 2.5V or 1.8V switching Packaging (Pb-free & Green available): - 20-pin, 150-mil wide plastic QSOP (Q) - 20-pin, 173-mil wide plastic TSSOP (L) Description Pericom Semiconductor's PI3VT series of logic circuits are produced using the Company's advanced submicron CMOS technology, achieving industry leading performance. The PI3VT3245 is a 2.5V or 3.3V 8-bit, 2-port bus switch designed with a low On-Resistance (5). The switches are turned ON or enabled by the Bus Enable (BE) input signal. Given a 3.3V supply and an input voltage of 3.3V, the switch translates to an output voltage of 2.5V. Similarly, when operated with a 2.5V supply and given 2.5V inputs, the device translates the outputs to 1.8V. Applications * 3.3V to 2.5V level shifting (voltage translation) * 2.5V to 1.8V level shifting (voltage translation) Block Diagram Pin Configuration NC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC BE B0 B1 B2 B3 B4 B5 B6 B7 A0 B0 A0 A1 A2 A7 B7 A3 A4 A5 BE A6 A7 GND Truth Table(1) Function Disconnect Connect Notes: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance BE H L A0-7 Hi-Z B0-7 Pin Description Pin Name BE A0-A7 B0-B7 VCC GND Bus A Bus B Power Ground Description Bus Enable Input (Active Low) 1 PS8530B 08/13/04 PI3VT3245 8-Bit, 2-Port, Low Voltage Translator Bus Switch Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ......................................................... -65C to +150C Ambient Temperature with Power Applied ........................ -40C to +85C Supply Voltage to Ground Potential..................................... -0.5V to +4.6V DC Input Voltage ................................................................. -0.5V to +5.5V 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. Exposure to absolute maximum rating conditions for extended periods may affect reliability. DC Electrical Characteristics (Over Operating Range, TA = -40C to +85C, VCC = 3.3V 10%) Parameters VIH VIL IIH IIL IOZH Description Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Test Conditions(1) Min. 2.0 -0.5 Guaranteed logic HIGH level Guaranteed logic LOW level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 A, B VCC VCC = Min, VIN = 0V, ION = -8mA RON Switch On-Resistance VCC = Min., VIN = 1.7V, ION = -8mA VCC = 2.3V., VIN = 0V, ION = -8mA VCC = 2.3V., VIN = 1.3V, ION = -8mA Vp Pass Voltage VIN = VCC = 3.3V, IOUT = -5A VIN = VCC = 2.5V, IOUT = -5A 2.3 5 15 6 25 2.5 1.8 Typ.(2) Max. VCC +0.3V 0.8 1 1 1 8 22 9 30 2.9 Units V A V Capacitance (TA = 25C, f = 1 MHz) Parameters(5) Description Input Capacitance A/B Capacitance, Switch Off A/B Capacitance, Switch On VIN = 0V Test Conditions Typ. 3.5 5.0 11.2 pF Units CIN COFF CON Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 3.3V, TA = 25C ambient and maximum loading. 3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second. 4. Measured by the voltage drop between A and B pin at indicated current through the switch. On-Resistance is determined by the lower of the voltages on the two (A,B) pins. 5. This parameter is determined by device characterization but is not production tested. 2 PS8530B 08/13/04 PI3VT3245 8-Bit, 2-Port, Low Voltage Translator Bus Switch Power Supply Characteristics Parameters ICC ICC Description Quiescent Power Supply Current Quiescent Current per Input HIGH Test Conditions(1) VCC = Max. VIN = GND or VCC VIN = 3V(3) Min. Typ.(2) Max. 3 50 Units A Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at VCC = 3.3V, +25C ambient. 3. Per driven input (control input only); A and B pins do not contribute to ICC. Switching Characteristics over 3.3V 0.3V Operating Range Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ Description Propogation Delay(2,3) Ax to Bx Enable Time BE to Ax or Bx Disable Time BE to Ax or Bx Conditions(1) CL = 50pF, RL = 500 CL = 50pF, RL = 500, R = 500 1.5 1.5 Com. Min. Max. 0.25 9.8 8.3 ns Units Switching Characteristics over 2.5V 0.2V Operating Range Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ Description Propogation Delay(2,3) Ax to Bx Enable Time BE to Ax or Bx Disable Time BE to Ax or Bx Conditions(1) CL = 50pF, RL = 500 CL = 50pF, RL = 500, R = 500 1.5 1.5 Com. Min. Max. 0.25 9.8 8.3 ns Units Notes: 1. See test circuit and waveforms. 2. This parameter is guaranteed but not tested on Propagation Delays. 3. The bus switch contributes no propagational delay other than the RC delay of the On-Resistance of the switch and the load capacitance. The time constant for the switch alone is of the order of 0.25ns for 50pF load. Since this time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side. 3 PS8530B 08/13/04 PI3VT3245 8-Bit, 2-Port, Low Voltage Translator Bus Switch Packaging Mechanical: 20-pin QSOP (Q) 20 .008 0.20 MIN. .150 .157 3.81 3.99 Guage Plane .008 .013 0.20 0.33 1 .010 0.254 .337 8.56 .344 8.74 Detail A .016 .035 0.41 0.89 .041 1.04 REF 0-6 .058 REF 1.47 .053 1.35 .069 1.75 SEATING PLANE .015 x 45 0.38 Detail A .007 .010 .016 .050 0.41 1.27 0.178 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: 20-pin TSSOP (L) 20 .169 .177 4.3 4.5 1 .252 .260 6.4 6.6 .004 0.09 .008 0.20 .047 1.20 Max SEATING PLANE 0.45 0.75 .018 .030 .238 .269 .0256 BSC 0.65 .007 .012 0.19 0.30 .002 0.05 .006 0.15 6.1 6.7 X.XX X.XX DENOTES CONTROLLING DIMENSIONS IN MILLIMETERS 4 PS8530B 08/13/04 PI3VT3245 8-Bit, 2-Port, Low Voltage Translator Bus Switch Ordering Information Ordering Code PI3VT3245L PI3VT3245LE PI3VT3245Q PI3VT3245QE Packaging Code L L Q Q Package Description 20-pin TSSOP Pb-free & Green, 20-pin TSSOP 20-pin QSOP Pb-free & Green, 20-pin QSOP 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 5 PS8530B 08/13/04 |
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