PI5C3245 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 8-Bit, 2-Port Bus Switch Features Description • • • • Near-Zero propagation delay 5-ohm switches connect inputs to outputs Direct bus connection when switches are on Ultra Low Quiescent Power (0.2μA typical) – Ideally suited for notebook applications • Pin compatible with 74 series 245 logic devices • Packaging (Pb-free & Green available): – 20-pin 173-mil wide plastic TSSOP (L) – 20-pin 150-mil wide plastic QSOP (Q) – 20-pin 300-mil wide plastic SOIC (S) Pericom Semiconductor’s PI5C3245 is a 8-bit, 2-port bus switch designed with a low On-Resistance (5-ohm) allowing inputs to be connected directly to outputs. The bus switch creates no additional propagational delay or additional ground bounce noise. The switches are turned on by the Bus Enable (BE) input signal. The pinout is compatible with PI74FCT245T (Octal Bidirectional Transceiver). Block Diagram Pin Configuration A0 B0 A7 B7 NC A0 A1 A2 A3 A4 A5 A6 A7 GND BE BE H L Pin Name BE A0–7 B0 –7 GND VCC A0–7 Hi-Z B0–7 Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance 06-0239 20 19 18 17 16 15 14 13 12 11 VCC BE B0 B1 B2 B3 B4 B5 B6 B7 Pin Description Truth Table(1) Function Disconnect Connect 1 2 3 4 5 6 7 8 9 10 1 Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power PS7015D 05/11/06 PI5C3245 8-Bit, 2-Port Bus Switch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 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 (Inputs & Vcc Only) .......... –0.5V to +7.0V Supply Voltage to Ground Potential (Outputs & D/O Only) ....... –0.5V to +7.0V DC Input Voltage ......................................................................... –0.5V to +7.0V DC Output Current ................................................................................... 120 mA 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 the Operating Range, TA = –40°C to +85°C, VCC =5V ±5%) Parameters Description Test Conditions(1) Min. VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 VIL Input LOW Voltage Guaranteed Logic LOW Level –0.5 IIH Input HIGH Current IIL Typ(2) Max. Units V 0.8 V VCC = Max., VIN = VCC ±1 μA Input LOW Current VCC = Max., VIN = GND ±1 μA I OZH High Impedance Output Current 0 ≤A, B ≤VCC ±1 μA VIK Clamp Diode Voltage VCC = Min., IIN = –18mA –0.7 IOS Short Circuit Current(3) A (B) = 0V, B (A) = VCC 100 VH Input Hysteresis at Control Pins Switch On R ON Resistance(4) –1.2 V mA 150 VCC = Min., VIN = 0.0V, VCC = Min., VIN = 2.4V, ION = 48mA ION = 15mA mV 5 10 7 15 ohm 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 = 5.0V, 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. Capacitance (TA = 25°C, f = 1 MHz) Parameters(1) Description Test Conditions Max. Units CIN COFF Input Capacitance A/B Capacitance, Switch Off VIN = 0V VIN = 0V 6 6 pF pF CON A/B Capacitance, Switch On VIN = 0V 8 pF Notes: 1. This parameter is determined by device characterization but is not production tested. 06-0239 2 PS7015D 05/11/06 PI5C3245 8-Bit, 2-Port Bus Switch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Power Supply Characteristics Test Conditions(1) Parameters Description Min. ICC Quiescent Power Supply Current VCC = Max. VIN = GND or VCC ΔICC Supply Current per Input @ TTL HIGH VCC = Max. VIN = 3.4V(3) ICCD Supply Current per Input per MHz(4) VCC = Max., A and B Pins Open BE = GND Control Input Toggling 50% Duty Cycle Typ(2) Max. Units 0.1 3.0 μA 2.5 mA 0.25 mA/ MHz 1 2 Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at VCC = 5.0V, +25°C ambient. 3. Per TTL driven input (VIN = 3.4V, control inputs only); A and B pins do not contribute to ICC. 4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design. 3 4 5 6 Switching Characteristics over Operating Range Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ Description Conditions Propagation Delay(1,2) CL = 50pF Ax to Bx, Bx to Ax RL = 500-ohm Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx PI5C3245 Com. Min. Max. 7 Units 0.25 1.5 6.5 1.5 5.5 8 ns 9 Notes: 1. This parameter is guaranteed but not tested on Propagation Delays. 2. 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. 10 11 12 13 14 15 06-0239 3 PS7015D 05/11/06 PI5C3245 8-Bit, 2-Port Bus Switch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Packaging Mechanical: 20-pin SOIC (S) 20 .2914 .2992 7.40 7.60 0.254 x 45˚ 0.737 .010 .029 1 .496 12.60 .511 12.99 0.23 0.32 0.41 .016 1.27 .050 .020 0.508 REF .030 0.762 .0926 .1043 2.35 2.65 SEATING PLANE .050 BSC 1.27 .0091 .0125 0-8˚ .0040 .0118 .013 .020 0.33 0.51 .394 .419 10.00 10.65 0.10 0.30 X.XX DENOTES CONTROLLING X.XX DIMENSIONS IN MILLIMETERS Packaging Mechanical: 20-pin TSSOP (L) 20 .169 .177 4.3 4.5 1 .252 .260 6.4 6.6 .0256 BSC 0.65 06-0239 .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 4 PS7015D 05/11/06 PI5C3245 8-Bit, 2-Port Bus Switch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Packaging Mechanical: 20-pin QSOP (Q) 1 20 2 .008 0.20 MIN. .150 .157 .008 .013 0.20 0.33 3.81 3.99 Guage Plane .010 0.254 1 Detail A .337 8.56 .344 8.74 .041 1.04 REF .058 REF 1.47 4 .015 x 45˚ 0.38 .053 1.35 .069 1.75 5 Detail A .007 .010 SEATING PLANE .016 .050 .025 BSC 0.635 3 0˚-6˚ .016 .035 0.41 0.89 .004 0.101 .010 0.254 0.178 0.254 0.41 1.27 6 .228 .244 5.79 6.19 .008 0.203 .012 0.305 7 X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS 8 9 Ordering Information Ordering Code Package Code Package Type 10 PI5C3245Q Q 20-pin 150-mil wide plastic QSOP PI5C3245QE Q Pb-free & Green, 20-pin 150-mil wide plastic QSOP PI5C3245S S 20-pin 300-mil wide plastic SOIC PI5C3245L L 20-pin 173-mil wide plastic TSSOP PI5C3245LE L Pb-free & Green, 20-pin 173-mil wide plastic TSSOP 11 12 Notes: • Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ • E = Pb-free & Green • Adding an X suffix = Tape/Reel 13 14 15 Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com 06-0239 5 PS7015D 05/11/06