PI5C3245 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 8-Bit, 2-Port Bus Switch Product Features Product Description Near zero propagation delay 5ohm 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 Packages available: 20-pin 173 mil wide plastic TSSOP (L) 20-pin 300 mil wide plastic PDIP (P) 20-pin 150 mil wide plastic QSOP (Q) 20-pin 300 mil wide plastic SOIC (S) Pericom Semiconductors PI5C series of logic circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading performance. The PI5C3245 is a 8-bit, 2-port bus switch designed with a low ON resistance (5ohm) 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). Product Pin Configuration Logic Block Diagram A0 B0 A7 B7 NC A0 A1 A2 A3 A4 A5 A6 A7 GND 1 20 2 19 3 18 4 20-Pin 17 L,P,Q,S 5 16 VCC BE B0 B1 B2 6 7 8 9 10 B3 B4 B5 B6 B7 15 14 13 12 11 BE Product Pin Description Truth Table(1) Function Disconnect Connect BE H L Pin Name BE A07 B07 GND VCC A07 Hi-Z B07 Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance 1 Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power PS7015A 06/28/99 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 R ON Switch 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 Capacitance (TA = 25°C, f = 1 MHz) Parameters(5) 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. 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. 5. This parameter is determined by device characterization but is not production tested. 2 PS7015A 06/28/99 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 ∆ICC 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 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. 1 2 3 4 5 6 Switching Characteristics over Operating Range Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ Conditions(1) Description Propagation Delay(2,3) CL = 50pF Ax to Bx, Bx to Ax RL = 500ohm Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx PI5C3245 Com. Min. Max. 7 Units 8 0.25 1.5 6.5 1.5 5.5 ns 9 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. Ordering Information P/N Package Width PI5C3245Q 20 - Q SO P (Q 20) 150- mil PI5C3245S 20 - SO IC (Q 20) 300- mil 10 11 12 13 14 15 Pericom Semiconductor Corporation 2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com 3 PS7015A 06/28/99