PI3VT3245 8-Bit, 2-Port, Low Voltage Translator Bus Switch Features Description • • • • • Pericom Semiconductor’s PI3VT series of logic circuits are produced using the Company’s advanced submicron CMOS technology, achieving industry leading performance. 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) The PI3VT3245 is a 2.5V or 3.3V 8-bit, 2-port bus switch designed with a low On-Resistance (5Ω). 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 A0 NC 1 20 VCC A0 2 19 BE A1 3 18 B0 A2 4 17 B1 A3 5 16 B2 A4 6 15 B3 A5 7 14 B4 A6 8 13 B5 A7 9 12 B6 GND 10 11 B7 B0 A7 B7 BE Truth Table(1) Function BE A0-7 Disconnect H Hi-Z Connect L B0-7 Pin Description Pin Name Notes: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance 1 Description BE Bus Enable Input (Active Low) A0-A7 Bus A B0-B7 Bus B VCC Power GND Ground 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 ......................................................... –65°C to +150°C Ambient Temperature with Power Applied ........................ –40°C to +85°C Supply Voltage to Ground Potential..................................... –0.5V to +4.6V DC Input Voltage ................................................................. –0.5V to +5.5V DC Output Current............................................................................ 120mA 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. Power Dissipation ................................................................................ 0.5W DC Electrical Characteristics (Over Operating Range, TA = –40°C to +85°C, VCC = 3.3V ±10%) Description Test Conditions(1) VIH Input HIGH Voltage Guaranteed logic HIGH level 2.0 VCC +0.3V VIL Input LOW Voltage Guaranteed logic LOW level -0.5 0.8 IIH Input HIGH Current VCC = Max., VIN = VCC ±1 IIL Input LOW Current VCC = Max., VIN = GND ±1 IOZH High Impedance Output Current 0 ≤ A, B ≤ VCC ±1 Parameters RON Vp Switch On-Resistance Min. Max. VCC = Min, VIN = 0V, ION = -8mA 5 8 VCC = Min., VIN = 1.7V, ION = -8mA 15 22 VCC = 2.3V., VIN = 0V, ION = -8mA 6 9 VCC = 2.3V., VIN = 1.3V, ION = -8mA 25 30 2.5 2.9 VIN = VCC = 3.3V, IOUT = -5µA Pass Voltage Typ.(2) 2.3 VIN = VCC = 2.5V, IOUT = -5µA Units V µA Ω V 1.8 Capacitance (TA = 25°C, f = 1 MHz) Parameters(5) Description CIN Input Capacitance COFF A/B Capacitance, Switch Off CON A/B Capacitance, Switch On Test Conditions Typ. Units 3.5 VIN = 0V 5.0 pF 11.2 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 = 25°C 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 Description ICC Quiescent Power Supply Current ∆ICC Quiescent Current per Input HIGH Test Conditions(1) VCC = Max. Min. Typ.(2) Max. VIN = GND or VCC VIN = 3 3V(3) 50 Units µA 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, +25°C ambient. 3. Per driven input (control input only); A and B pins do not contribute to ΔICC. Switching Characteristics over 3.3V ±0.3V Operating Range Parameters Conditions(1) Description tPLH tPHL Propogation Delay(2,3) Ax to Bx CL = 50pF, RL = 500Ω tPZH tPZL Enable Time BE to Ax or Bx tPHZ tPLZ Disable Time BE to Ax or Bx CL = 50pF, RL = 500Ω, R = 500Ω Com. Min. Max. Units 0.25 1.5 9.8 1.5 8.3 ns Switching Characteristics over 2.5V ±0.2V Operating Range Parameters Conditions(1) Description tPLH tPHL Propogation Delay(2,3) Ax to Bx CL = 50pF, RL = 500Ω tPZH tPZL Enable Time BE to Ax or Bx tPHZ tPLZ Disable Time BE to Ax or Bx CL = 50pF, RL = 500Ω, R = 500Ω Com. Min. Max. Units 0.25 1.5 9.8 1.5 8.3 ns 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 .008 .013 0.20 0.33 Guage Plane .010 0.254 1 Detail A .337 8.56 .344 8.74 0˚-6˚ .016 .035 0.41 0.89 .041 1.04 REF .058 REF 1.47 .015 x 45˚ 0.38 .053 1.35 .069 1.75 Detail A .007 .010 SEATING PLANE .016 .050 .025 BSC 0.635 .004 0.101 .010 0.254 .008 0.203 .012 0.305 0.178 0.254 0.41 1.27 .228 .244 5.79 6.19 X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS Packaging Mechanical: 20-pin TSSOP (L) 20 .169 .177 1 .252 .260 6.4 6.6 .0256 BSC 0.65 4.3 4.5 .004 0.09 .008 0.20 .047 1.20 Max .007 .012 0.19 0.30 0.45 0.75 SEATING PLANE .018 .030 .238 .269 6.1 6.7 .002 0.05 .006 0.15 X.XX X.XX 4 DENOTES CONTROLLING DIMENSIONS IN MILLIMETERS 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