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PI5C16862C
20-Bit, 2-Port Bus Switch with Undershoot Protection
Product Features
* * * * * Near-zero propagation delay 5 switches connect inputs to outputs Undershoot Protection up to 1V Direct bus connection when switches are ON 32X384 function with flow through pinout make board layout easier * Ultra-low quiescent power (120A typical) ideally suited for notebook applications * Industrial operating temperature: 40C to +85C * Packages available: 48-pin 240-mil wide plastic TSSOP (A) 48-pin 150-mil wide plastic BQSOP (B)
Product Description
Pericom Semiconductors PI5C series of Bus Switch circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading speed. The PI5C16862C is configured as a 20-bit, 2-port bus switch designed with a low ON resistance (5) 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 (BEx) input signal. The PI5C16862C can withstand undershoot of up to 1V.
Logic Block Diagram
Product Pin Configuration
48-Pin A,B
Truth Table(1)
Function Disconnect Connect BEX A19-A0 H Hi-Z L B19-B0
Product Pin Description
Pin Name BEx A19-A0 B19-B0
1
Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
Description Bus Enable Inputs (Active LOW) Bus A Bus B
PS8391A 06/10/99
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PI5C16862C 20-Bit, 2-Port Bus Switch with Undershoot Protection
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 .............................................................................. 120mA 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 = 40C to +85C, VCC = 5V 10%)
Parameters Description VIH VIL IIH IIL IOZH VIK IOS VH RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage 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 VCC VCC = Min., IIN = -18mA A (B) = 0V, B (A) = VCC VCC = Min., VIN = 0.0V, ION = 48mA VCC = Min., VIN = 2.4V, ION = 15mA
Min. 2.0 -0.5 -- -- -- -- 100 -- -- --
Typ.(2) -- -- -- -- -- -- 150 5.5 9
Max. -- 0.8 1 1 1 -1.8 -- -- 8 16
Units V V A A A V mA mV
Input Hysteresis at Control Pins Switch On Resistance(4)
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. 6 6 10 Units pF pF 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= 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 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.
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PS8391A
06/10/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C16862C 20-Bit, 2-Port Bus Switch with Undershoot Protection
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) Test Conditions(1) VCC = Max. VCC = Max. VCC = Max., A and B Pins Open BEX = GND Control Input Toggling 50% Duty Cycle VIN = GND or VCC VIN = 3.4V(3) Min. Typ.(2) 120 Max. 200 2.5 0.25 Units A mA 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, +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.
PI5C16862 Switching Characteristics over Operating Range
PI5C16862C Com. Min. Max.
0.25 1.5 1.5 6.5 5.5 ns
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)
CL = 50pF RL = 500
Units
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.
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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PS8391A 06/10/99

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