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PI5C32X2384 20-Bit Bus Switch
PI5C32X2384
20-Bit Bus Switch with 25 Series Resistor
Product Features
* * * * * Near-zero propagation delay 25 series resistor 5 switches connect inputs to outputs Direct bus connection when switches are ON Ultra-low quiescent power 32X2384 (0.2A typical) - Ideally suited for notebook applications * Packages available: - 48-pin 150-mil wide plastic BQSOP (B) - 48-pin 240-mil wide plastic TSSOP (A)
Product Description
Pericom Semiconductor's PI5C series of BusSwitch circuits are produced in the Company's advanced sub-micron CMOS technology, achieving industry leading performance. The PI5C32X2384 is a 20-bit bus switches designed with a low ON resistance 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. Four bus enable signals are provided, one for each of the upper and lower five bits of the two 10-bit buses. There is an internal 25 series resistor to reduce noise reflection in high-speed applications.
Logic Block Diagram
A0 B0 A5 B5
Product Pin Configuration
BEA B0 A0 A1 B1 B2 A2 A3 B3 B4 A4 GND BEC B5 A5 A6 B6 B7 A7 A8 B8 B9 A9 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VCC B19 A19 A18 B18 B17 A17 A16 B16 B15 A15 BEB VCC B14 A14 A13 B13 B12 A12 A11 B11 B10 A10 BED
A4 A15
B4 B15
A9 A10
B9 B10
48-PIN A, B
A19
B19
A14
B14
BEA BEB BEC BED
Truth Table(1)
Function BEA BEB B4-B0 B19-B15 Disconnect H H Hi-Z Hi-Z Connect L H A4-A0 Hi-Z Connect H L Hi-Z A19-A15 Connect L L A4-A0 A19-A15 Function BEC BED B9-B5 B14-B10 Disconnect H H Hi-Z Hi-Z Connect L H A9-A5 Hi-Z Connect H L Hi-Z A14-A10 Connect L L A9-A5 A14-A10 Note: 1. H = High Voltage Level, L = Low Voltage Level, Hi-Z = High Impedance
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Product Pin Description
Pin Name BEx A19-A0 B19-B0 GND VCC Description Bus Enable Inputs (Active LOW) Bus A Bus B Ground Power
PS8101C
01/18/99
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ........................................................... -65C to +150C Ambient Temperature with Power Applied .......................... -40C to +85C 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.
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 = 25C 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 AB and CD pin at indicated current through the switch. ON resistance is determined by the lower of the voltages on the two (A or B, C or D) pins. 5. This parameter is determined by device characterization but is not production tested.
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PI5C32X2384 20-Bit Bus Switch
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 5V 5%)
Parameters Description VIH VIL IIH IIL IOZH IOS VH RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Short Circuit Current
(3)
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 - (A,B)(C,D) - VCC A,B (C,D) = 0V, C,D (A,B) = VCC
Min. 2.0 -- -- -- -- -- --
Typ(2) -- -- -- -- -- 300 150 28 35
Max. -- 0.8 1 1 1 -- -- 40 48
Units V V A A A mA mV
Input Hysteresis at Control Pins Switch ON Resistance(4) VCC = Min., VIN = 0.0V ION = 48mA VCC = Min., VIN = 2.4V ION = 15mA
20 20
Capacitance (TA = 25C, f = 1 MHz)
Parameters(5) CIN COFF CON Description Input Capacitance A/B Capacitance, Switch Off A/B Capacitance, Switch On Test Conditions VIN = 0V VIN = 0V VIN = 0V Typ -- -- -- Max. 6 6 8 Units pF pF pF
2
PS8101C
01/18/99
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PI5C32X2384 20-Bit Bus Switch
Power Supply Characteristics
Parameters ICC ICC ICCD Description Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) VCC = Max. VCC = Max. VCC = Max., A and B Pins Open BE1 or BE2 = GND Control Input Toggling 50% Duty Cycle Test Conditions(1) VIN = GND or VCC VIN = 3.4V(3) PI5C32X2384 Min. Typ(2) 0.1 Max. 3.0 2.5 0.25 Units A mA mA/ MHz
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, +25C 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.
PI5C32X2384 Switching Characteristics over Operating Range
Parameters Description tPLH tPHL tPZH tPZL tPHZ tPLZ 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 Conditions
(1)
PI5C32X2384 Min Typ Max -- 1.5 1.5 1.25 -- -- -- 7.5 5.5
Units ns ns ns
CL = 50pF RL = 500
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 1.25ns 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
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PS8101C 01/18/99

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