PI5C16862C 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 20-Bit, 2-Port Bus Switch with Undershoot Protection Product Features Product Description • • • • • Near-zero propagation delay 5ohm switches connect inputs to outputs Undershoot Protection up to 1V Direct bus connection when switches are ON 32X384 function with flow through pinout make board layout easier • Ultra-low quiescent power (120µA typical) ideally suited for notebook applications • Industrial operating temperature: 40°C to +85°C • Packages available: 48-pin 240-mil wide plastic TSSOP (A) 48-pin 150-mil wide plastic BQSOP (B) Pericom Semiconductors PI5C series of Bus Switch circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading speed. Logic Block Diagram Product Pin Configuration The PI5C16862C is configured as a 20-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 (BEx) input signal. The PI5C16862C can withstand undershoot of up to 1V. 48-Pin A,B Truth Table(1) Function Disconnect Connect BEX A19-A0 H Hi-Z L B19-B0 Product Pin Description Pin Name BEx A19-A0 B19-B0 Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance 1 Description Bus Enable Inputs (Active LOW) Bus A Bus B PS8391A 06/10/99 PI5C16862C 20-Bit, 2-Port Bus Switch with Undershoot Protection 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 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 .............................................................................. 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 the Operating Range, TA = 40°C to +85°C, VCC = 5V ±10%) Test Conditions(1) Parameters Description Min. Typ.(2) Max. Units VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V VIL Input LOW Voltage Guaranteed Logic LOW Level 0.5 0.8 V IIH Input HIGH Current VCC = Max., VIN = VCC ±1 µA IIL Input LOW Current VCC = Max., VIN = GND ±1 µA IOZH High Impedance Output Current 0 ≤A, B ≤VCC ±1 µA VIK Clamp Diode Voltage VCC = Min., IIN = 18mA 1.8 V A (B) = 0V, B (A) = VCC 100 mA 150 mV VCC = Min., VIN = 0.0V, ION = 48mA 5.5 8 VCC = Min., VIN = 2.4V, ION = 15mA 9 16 (3) IOS Short Circuit Current VH Input Hysteresis at Control Pins RON Switch On Resistance(4) ohm Capacitance (TA = 25°C, f = 1 MHz) Parameters(5) Description Test Conditions Typ. 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 10 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 PS8391A 06/10/99 PI5C16862C 20-Bit, 2-Port Bus Switch with Undershoot Protection 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 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 BEX = GND Control Input Toggling 50% Duty Cycle Typ.(2) Max. Units 120 200 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. PI5C16862 Switching Characteristics over Operating Range Parameters tP L H tP H L tPZH tPZL tPHZ tPLZ Description Conditions(1) Propagation Delay(2,3) Ax to Bx, Bx to Ax Bus Enable Time BEX to Ax or Bx Bus Disable Time BEx to Ax or Bx CL = 50pF RL = 500ohm PI5C16862C Com. Min. Max. Units 0.25 1.5 6.5 1.5 5.5 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. Pericom Semiconductor Corporation 2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com 3 PS8391A 06/10/99