PI5C32245 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 8-Bit, 2-Port Bus Switch Ω Series Resistor with 25Ω Product Features: Product Description: • • • • • Near zero propagation delay 25Ω series resistor termination 5Ω switches connect inputs to outputs Direct bus connection when switches are ON Ultra Low Quiescent Power (0.2 µA Typical) – Ideally suited for notebook applications • Pin compatible with 74 series 245 logic devices • Packages available: – 20-pin 150 mil wide plastic QSOP (Q) Pericom Semiconductor’s PI5C series of logic circuits are produced in the Company’s advanced 0.8 micron CMOS technology, achieving industry leading performance. The PI5C32245 is a 8-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 switches are turned ON by the Bus Enable (BE) input signal. Pinout is compatible with PI74FCT245T (Octal Bidirectional Transceiver). The device has a built-in 25Ω 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 B0 A7 B7 1 2 20 19 VCC BE A1 A2 3 18 4 20-PIN 17 B0 B1 A3 A4 5 6 16 15 B2 B3 A5 A6 7 8 14 13 B4 B5 A7 9 12 B6 10 11 B7 GND Q BE Product Pin Description Truth Table(1) Function Disconnect Connect 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 149 Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power PS8136 08/20/97 PI5C32245 8-BIT, 2-PORT BusSwitch Ω Series Resistor with 25Ω 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%) Test Conditions(1) Parameters Description 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 IOZH High Impedance Output Current 0 ≤ A, B ≤ VCC ±1 µA VIK Clamp Diode Voltage VCC = Min., IIN = –18 mA –1.2 V (3) IOS Short Circuit Current VH Input Hysteresis at Control Pins RON Switch On Resistance (4) A (B) = 0V, B (A) = VCC –0.7 100 mA 150 VCC = Min., VIN = 0.0V, ION = 48 mA VCC = Min., VIN = 2.4V, ION = 15 mA mV 28 35 Ω 40 48 Capacitance (TA = 25°C, f = 1 MHz) Parameters(5) Description Test Conditions CIN COFF Input Capacitance A/B Capacitance, Switch Off CON A/B Capacitance, Switch On Typ Max. Units VIN = 0V VIN = 0V 6 6 pF pF 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. 150 PS8136 08/20/97 PI5C32245 8-BIT, 2-PORT BusSwitch Ω Series Resistor with 25Ω 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 1 2 3 4 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. PI5C32245 8 Com. tPLH tPHL tPZH tPZL tPHZ tPLZ Description (2,3) Propagation Delay Ax to Bx, Bx to Ax Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx 6 7 Switching Characteristics over Operating Range Parameters 5 Conditions(1) Min. Max. Unit 1.25 ns 1.5 7.5 ns 1.5 5.5 ns CL = 50 pF RL = 500Ω 9 10 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 0.25 ns for 50 pF 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. 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 151 PS8136 08/20/97