PI5C32244 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 8-bit, 2-Port BusSwitch with 25ohm Series Resistor Product Features Product Description Near zero propagation delay 25ohm series resistor termination Direct bus connection when switches are ON Ultra Low Quiescent Power (0.2µA Typical) Ideally suited for notebook applications Pin compatible with 74 Series 244 logic devices Packages available: 20-pin 150 mil wide plastic QSOP (Q) Pericom Semiconductors PI5C series of logic circuits are produced in the Companys advanced submicron CMOS technology, achieving industry leading performance. The PI5C32244 features a set of eight bus switches which is pinout and function compatible with the PI74FCT244T, 74F244, and 74ALS/AS/LS 244 8-bit drivers. Two enable signals (BEn) turn the switches on similar to the enable signals of the 244. The bus switch creates no additional propagation delay or ground bounce noise. The device has a built-in 25ohm resistor to reduce noise resulting from reflections, thus eliminating the need for an external terminating resistor. Logic Block Diagram BE1 Product Pin Configuration 1A0 1B0 1A1 1B1 1A2 1B2 BE1 1A0 2B3 1A1 1A3 2B2 1B3 1A2 2B1 1A3 BE2 2B0 GND 2A0 2B0 2A1 2B1 2A2 2B2 2A3 2B3 BE2 H H L L 1A, 1B Disconnect 1A = 1B Disconnect 1A = 1B 20 19 VCC BE2 3 18 4 17 5 20-Pin 16 Q 6 15 1B0 7 8 14 13 1B2 9 10 12 11 1B3 2A3 1B1 2A2 2A1 2A0 Product Pin Description Pin Name BEn A0-A3 B0-B3 GND VCC Truth Table(1) BE1 H L H L 1 2 2A, 2B Disconnect Disconnect 2A = 2B 2A = 2B Description Bus Output Enable (Active LOW) Bus A Bus B Ground Power Note: 1. H = High Voltage Level L = Low Voltage Level 1 PS8145 11/07/97 PI5C32244 8-Bit, 2-Port Bus Switch with 25ohm Series Resistor 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 IOZH High Impedance Output Current 0 ≤ A, B ≤ VCC ±1 µA VIK Clamp Diode Voltage VCC = Min., IIN = 18 mA 0.7 IOS Short Circuit Current A (B) = 0V, B (A) = VCC 100 VH Input Hysteresis at Control Pins RON Switch On Resistance (3) (4) 1.2 V mA 150 VCC = Min., VIN = 0.0V, ION = 48 mA VCC = Min., VIN = 2.4V, ION = 15 mA 18 18 mV 28 35 40 48 ohm 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. 2 PS8145 11/07/97 PI5C32244 8-Bit, 2-Port Bus Switch with 25ohm Series Resistor 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 BE1 or BE2 = 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 conditions shown as Max. or Min., 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. Switching Characteristics over Operating Range 5 6 7 PI5C32244 Com. Parameters Description Conditions(1) tPLH tPHL Propagation Delay(2,3) Ax to Bx CL = 50 pF RL = 500Ω tPZH tPZL Bus Enable Time BEX to Ax or Bx tPHZ tPLZ Bus Disable Time BEX to Ax or Bx Min Max 8 Unit 2 ns 1.5 5.6 ns 1.5 5.2 ns 9 10 11 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. 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 PS8145 11/07/97