PI5C3257 QUAD 2:1 MUX/DEMUX BusSwitch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 PI5C3257 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Quad 2:1 MUX/DEMUX BusSwitch Product Features: Product Description: • Near zero propagation delay • 5Ω 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 257 logic devices • Packages available: – 16-pin 150 mil wide plastic QSOP (Q) – 16-pin 300 mil wide plastic SOIC (S) – 16-pin 150 mil wide plastic SOIC (W) – 20-pin 150 mil wide plastic TSSOP (R) 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 PI5C3257 is a Quad 2:1 multiplexer/demultiplexer with threestate outputs that is pinout and function compatible with the PI74FCT257T, 74F257, and 74ALS/AS/LS257. Inputs can be connected to outputs with low on resistance (5Ω) with no additional ground bounce noise or propagation delay. 16-Pin Product Configuration Logic Block Diagram IA1 IA0 IB0 IB1 IC0 IC1 ID0 ID1 IB0 IB1 YB GND E S 16 1 15 2 14 3 16-PIN 13 4 12 5 11 6 10 7 9 8 VCC E ID0 ID1 YD IC0 IC1 YC 20-Pin Product Configuration YA YB S X L H YA Hi-Z IA0 IA1 YC YD Product Pin Description Truth Table(1) E H L L S IA0 IA1 YA YB Hi-Z IB0 IB1 YC Hi-Z IC0 IC1 YD Hi-Z ID0 ID1 Note: 1. H = High Voltage Level L = Low Voltage Level Function Disable S=0 S=1 Pin Name IAn-IDn S E YA-YD GND VCC NC 158 Description Data Inputs Select Inputs Enable Data Outputs Ground Power No Connect NC S IA0 IA1 YA IB0 IB1 YB GND NC 20 1 19 2 18 3 4 20-PIN17 5 R20 16 15 6 14 7 13 8 12 9 11 10 NC VCC E ID0 ID1 YD IC0 IC1 YC NC PS7018A 03/13/96 PI5C3257 QUAD 2:1 MUX/DEMUX BusSwitch 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................................................. –55°C to +125°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 ≤ I, Y ≤ 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 (4) Switch On Resistance I (Y) = 0V, Y (I) = VCC –0.7 100 mA 150 VCC = Min., VIN = 0.0V, ION = 48 mA VCC = Min., VIN = 2.4V, ION = 15 mA mV 5 10 Ω 7 15 Capacitance (TA = 25°C, f = 1 MHz) Parameters(5) Description Test Conditions CIN COFF Input Capacitance In/Yn Capacitance, Switch Off CON In/Yn Capacitance, Switch On Typ Max. Units VIN = 0V VIN = 0V 6 6 pF pF VIN = 0V 14 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 I and Y pin at indicated current through the switch. ON resistance is determined by the lower of the voltages on the two (I,Y) pins. 5. This parameter is determined by device characterization but is not production tested. 159 PS7018A 03/13/96 PI5C3257 QUAD 2:1 MUX/DEMUX BusSwitch 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., I and Y 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); I and Y 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 I and Y inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design. Switching Characteristics over Operating Range PI5C3257 Com. Parameters (1) Description Conditions CL = 50 pF RL = 500Ω tPZH tPZL Propagation Delay(2,3) In to Yn BusSelectTime Sn to Yn BusDisableTime E to Yn tPHZ BusDisableTime tPLZ E to Yn t IY tSY Min Max Unit 0.25 ns 0.5 5.2 ns 0.5 4.8 ns 0.5 5.0 ns Notes: 1. See test circuit and wave forms. 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. Pericom Semiconductor Corporation 2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com 160 PS7018A 03/13/96