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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3245
8-Bit, 2-Port Bus Switch
Product Features

Near zero propagation delay 5 switches connect inputs to outputs Direct bus connection when switches are on Ultra Low Quiescent Power (0.2A Typical) Ideally suited for notebook applications Pin compatible with 74 series 245 logic devices Packages available: 20-pin 173 mil wide plastic TSSOP (L) 20-pin 300 mil wide plastic PDIP (P) 20-pin 150 mil wide plastic QSOP (Q) 20-pin 300 mil wide plastic SOIC (S)
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading performance. The PI5C3245 is a 8-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 (BE) input signal. The pinout is compatible with PI74FCT245T (Octal Bidirectional Transceiver).
Logic Block Diagram
Product Pin Configuration
A0
B0
A7
B7
NC A0 A1 A2 A3 A4 A5 A6 A7 GND
1 20 2 19 3 18 4 20-Pin 17 L20 5 P20 16 6 Q20 15 7 S20 14 8 13 9 12 10 11
VCC BE B0 B1 B2 B3 B4 B5 B6 B7
BE
Truth Table(1)
Function Disconnect Connect BE H L A0-7 Hi-Z B0-7
Product Pin Description
Pin Name BE A0-7 B0-7 GND VCC Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power
Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
1
PS7015A
06/28/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3245 8-Bit, 2-Port Bus Switch
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.
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC =5V 5%)
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 Switch On 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 100 150 5 10 7 15 -0.7 Min. 2.0 -0.5 0.8 1 1 1 -1.2 Typ(2) Max. Units V V A A A V mA mV
Input Hysteresis at Control Pins 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 Max. 6 6 8 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.
2
PS7015A
06/28/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3245 8-Bit, 2-Port Bus Switch
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 BE = GND Control Input Toggling 50% Duty Cycle VIN = GND or VCC VIN = 3.4V(3) Min. Typ(2) 0.1 Max. 3.0 2.5 0.25 Units A
1 2
mA mA/ MHz
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, +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.
5 6 7 8
Switching Characteristics over Operating Range
Conditions(1) CL = 50pF RL = 500 PI5C3245 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 BE to Ax or Bx Bus Disable Time BE to Ax or Bx
Units
9 10 11 12 13 14 15
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.
Ordering Information
P/N PI5C3245Q PI5C3245S Package 20 - Q SO P (Q 20) 20 - SO IC (Q 20) Width 150- mil 300- mil
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
3
PS7015A 06/28/99

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