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PI3B3125 PI3B3126
3.3V, Hot Insertion, 4-Bit, 2-Port Bus Switch with Individual Enables
Product Features
Near zero propagation delay 5 Ohm switches connect inputs to outputs Fast Switching Speed - 4ns max. Permits Hot Insertion Ultra Low Quiescent Power (0.1A Typical) Ideally suited for notebook applications Packages available: 14-pin 150 mil wide plastic SOIC (W) 14-pin 170 mil wide plastic TSSOP (L) 16-pin 150 mil wide plastic QSOP (Q)
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced using the Companys advanced sub micron CMOS technology, achieving industry leading speed grades. The PI3B3125 and PI3B3126 are 3.3 Volt, 4-bit bus switches designed with four individual 5Ohm bus switches with fast indiviual enables in an industry standard 74XX125/126 pinout. When enabled via the associated Bus Enable (BE) pin, the A pin is directly connected to the B pin for that particular gate. The bus switch introduces no additional propagation delay or additional ground bounce noise. The PI3B3125 device has active LOW enables, and the PI3B3126 has active HIGH enables.
PI3B3125 Logic Block Diagram
A0 BE0 A1 BE1 A2 BE2 A3 BE3 B3 B2 B1 B0
PI3B3126 Logic Block Diagram
A0 BE0 A1 BE1 A2 BE2 A3 BE3 B3 B2 B1 B0
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PS8153D
01/05/00
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B3125/PI3B3126 3.3V, Hot Insertion, 4-Bit, 2-Port BusSwitch
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 +4.6V Supply Voltage to Ground Potential (Outputs & D/O Only) . -0.5V to +4.6V DC Input Voltage ................................................................... -0.5V to +4.6V 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.
PI3B3125 14-Pin Product Pin Configuration
BE0 A0 B0 BE1 A1 B1 GND 1 14 2 13 3 14-PIN 12 4 W, L 11 W14 5 10 6 9 7 8 Vcc BE3 A3 B3 BE2 A2 B2
PI3B3126 14-Pin Product Pin Configuration
BE0 A0 B0 BE1 A1 B1 GND 1 14 2 13 3 14-PIN 12 4 W, L 11 W14 5 10 6 9 7 8 Vcc BE3 A3 B3 BE2 A2 B2
PI3B3125 16-Pin Product Pin Configuration
NC BE0 A0 B0 BE1 A1 B1 GND 1 16 2 15 3 16-PIN 14 4 Q Q16 13 5 12 6 11 7 10 8 9 Vcc BE3 A3 B3 BE2 A2 B2 NC
PI3B3126 16-Pin Product Pin Configuration
NC BE0 A0 B0 BE1 A1 B1 GND 1 16 2 15 3 16-PIN 14 4 Q Q16 13 5 12 6 11 7 10 8 9 Vcc BE3 A3 B3 BE2 A2 B2 NC
Product Pin Description
Pin Name BEn BEn A3-A0 B3-B0 VCC GND Description Switch Enable (PI3B3125) Switch Enable (PI3B3126) Bus A Bus B Power Ground
Truth Table(1)
PI3B3125 BEn X* H L PI3B3126 BEn X L H An Hi-Z Hi-Z Bn Bn Hi-Z Hi-Z An Vcc GND VCC VCC Function Disconnect Disconnect Connect
Notes: 1. H = High Voltage Level, L = Low Voltage Level HI-Z = High Impedance, X = Dont Care * A pull-up resistor should be provided for power-up protection.
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PI3B3125/PI3B3126 3.3V, Hot Insertion, 4-Bit, 2-Port BusSwitch
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 3.3V 10%)
Parameters Description VIH VIL IIH IIL IOFF VIK RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Off Current Clamp Diode Voltage Switch On Resistance(3) Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND VCC = 0, VOUT = 3 to 3.6V VCC = Min., IIN = -18mA VCC = Min., VIN = 0.0V, ION = 48mA or 60mA VCC = Min., VIN = 2.4V, ION = 15mA 5 10 Min. 2.0 -0.5 0.8 1 1 10 -1.2 8 17 Typ.(2) Max. Units V V A A A V
Capacitance (TA = 25C, f = 1 MHz)
Parameters(4) CIN COFF Description Input Capacitance A/B Capacitance, Switch Off Test Conditions VIN = 0V VIN = 0V Typ. 3.5 8 Units 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 = 3.3V, TA = 25C ambient and maximum loading. 3. 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. 4. This parameter is determined by device characterization but is not production tested.
Power Supply Characteristics
Parameters Description ICC ICC Quiescent Power Supply Current Supply Current per Input HIGH Test Conditions(1) VCC = Max. VCC = Max. VIN = GND or VCC VIN = 3.0V(3) Min. Typ.(2) Max. 0.1 3 750 Units A A
Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at VCC = 3.3V, +25C ambient. 3. Per driven input (control inputs only); A and B pins do not contribute to ICC.
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PS8153D
01/05/00
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B3125/PI3B3126 3.3V, Hot Insertion, 4-Bit, 2-Port BusSwitch
PI3B3125 Switching Characteristics over Operating Range
PI3B3125 Com.
Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ
Description Propagation Delay(2,3) Ax to Bx, Bx to Ax Bus Enable Time Bus Disable Time
Conditions(1) CL = 50pF RL = 500 CL = 50pF, RL = 500, R = 500
Min.
Max.
Units
0.25 1.0 1.0 3.0 4.0
ns ns ns
PI3B3126 Switching Characteristics over Operating Range
PI3B3125 Com.
Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ
Description Propagation Delay(2,3) Ax to Bx, Bx to Ax Bus Enable Time Bus Disable Time
Conditions(1) CL = 50pF RL = 500 CL = 50pF, RL = 500, R = 500
Min.
Max.
Units
0.25 1.0 1.0 2.5 4.0
ns ns ns
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
Part Numbe r PI3B3125Q PI3B3125W PI3B3125L PI3B3126Q PI3B3126W PI3B3126L Pin / Package 16- QSOP (Q ) 14- SOIC (W) 14- TSSOP (L) 16- QSOP (Q ) 14- SOIC (W) 14- TSSOP (L) Te mpe rature 40C to +85C 40C to +85C 40C to +85C 40C to +85C 40C to +85C 40C to +85C
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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PS8153D 01/05/00

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