PI3B16861/PI3B162861 3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 PI3B16861 Ω) PI3B162861 (25Ω 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch Product Features Product Description • • • • • • Near-zero propagation delay 5Ω or 25Ω switches connect inputs to outputs Fast Switching Speed - 5ns (max.) Direct bus connection when switches are ON Permits Hot Insertion 32X384 function with flow through pinout make board layout easier • Vcc Operating Range: 3.0V to 3.6V • Industrial operating temperature: –40°C to +85°C • Packages available: – 48-pin 240-mil wide plastic TSSOP (A) – 48-pin 300-mil wide plastic SSOP (V) – 48-pin 150-mil wide plastic BQSOP (B) Pericom Semiconductor’s PI3B series of Bus Switch circuits are produced in the Company’s advanced 0.35 micron CMOS technology, achieving industry leading speed. The PI3B16861 is configured as a 3.3 volt, hot insertion, 20-bit, 2-port bus switch designed with a low ON resistance (5Ω) allowing inputs to be connected directly to outputs. The bus switch creates no additional propagational delay or additional ground bounce noise. The switch is turned ON by the Bus Enable (BEx) input signal. The PI3B162861 device has a built-in 25-ohm series resistor to reduce noise resulting from reflections, thus eliminating the need for an external terminating resistor. Logic Block Diagram Product Pin Configuration A0 NC A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 GND NC A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 GND B0 A9 B9 BE1 A10 B10 A19 B19 BE2 Truth Table(1) Function Disconnect Connect BEX A19-A0 H Hi-Z L B19-B0 1 2 48 47 3 4 5 6 46 45 44 43 7 8 9 42 41 40 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VCC BE1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 VCC BE2 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 Product Pin Description Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance Pin Name BEx A19-A0 B19-B0 1 Description Bus Enable Inputs (Active LOW) Bus A Bus B PS8175B 11/06/98 PI3B16861/PI3B162861 3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch 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 .................................. –0°C to +85°C Supply Voltage Range .................................................................. –0.5V to +4.6V DC Input Voltage ......................................................................... –0.5V to +4.6V 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, V = 3.0V to 3.6V) CC Parameters Description Test Conditions (1) 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 — –0.7 –1.2 V RON Switch On Resistance(3) VCC = Min., VIN = 0.0V, 16861 — 5 8 Ω 162861 20 28 40 16861 — 10 15 162861 20 35 48 I ON = 48mA V CC = Min., V IN = 2.4V, I ON = 15mA Ω Capacitance (TA = 25°C, f = 1 MHz) Parameters(4) Description Test Conditions Typ Units CIN COFF Input Capacitance A/B Capacitance, Switch Off VIN = 0V VIN = 0V 3.0 8.5 pF pF CON A/B Capacitance, Switch On VIN = 0V 17.0 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 = 3.3V, TA = 25°C ambient and maximum loading. 3. 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. 4. This parameter is determined by device characterization but is not production tested. 2 PS8175B 11/06/98 PI3B16861/PI3B162861 3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Switching Characteristics over Operating Range PI3B16861/PI3B162861 Com. Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ Description Propagation Delay(2,3) Ax to Bx, Bx to Ax Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx Conditions(1) CL = 50pF RL = 500Ω CL = 50pF, RL = 500Ω, R = 500Ω 16861 162861 Min. Max. Units — — 1 0.25 1.25 4.5 ns 1 5 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. Power Supply Characteristics Parameters Description Test Conditions(1) Min. Typ(2) Max. Units ICC Quiescent Power Supply Current VCC = Max. VIN = GND or VCC 10 µA ∆ICC Supply Current per Input @ TTL HIGH VCC = Max. VIN = 3.0V(3) 750 µA ICCD Supply Current per Input per MHz(4) VCC = Max. A and B Pins Open BE = GND Control Input Toggling 50% Duty Cycle 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 = 3.3V, +25°C ambient. 3. Per TTL driven input (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. Pericom Semiconductor Corporation 2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com 3 PS8175B 11/06/98