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PI5C3308
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2- Bit Bus Switch with Active Low Enable
Product Features
* Near zero propagation delay * 5-Ohm switches connect inputs to outputs * Direct bus connection when switches are ON * Ultra Low Quiescent Power (0.2A Typical) - Ideally suited for notebook applications * Packages available: - 8-pin plastic SOIC (W)
Product Description
Pericom Semiconductor's PI5C series of logic circuits are produced using the Company's advanced submicron CMOS technology, achieving industry leading speed grades. The PI5C3308 is a 2-bit digital switch designed with a fast enable. When enabled via the associated Bus Enable (BE) pin, the "A" pin is directly connected to the "B" pin. The bus switch introduces no additional propagation delay or additional ground bounce noise. The PI5C3308 device has an active LOW enable.
PI5C3308 Logic Block Diagram
Product Pin Configuration
A1
B1
A1 B1 BE2 GND 1 8 Vcc BE1 B2 A2
BE1
2 3 4
8-Pin W
7 6 5
A2
B2
BE2
Truth Table(1)
BE H L A Hi- Z B B Hi- Z A Function Disconnect Connect
Product Pin Description
Pin Name BE A2- A1 B2- B1 VCC GND De s cription Switch Enable Bus A Bus B Power Ground
Notes: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance X = Don't Care
1
PS8368B
01/11/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3308 2-Bit Bus Switch with Active Low Enable
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%)
Parame te rs VIH VIL IIH IIL IOZH IOZL VH De s cription Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Te s t Conditions (1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND M in. 2.0 - 0.5 0.8 1 1 1 1 300 VCC = 4.5V, VIN = 0.0V, ION = 30mA or 64mA RON Switch On Resistance(3) VCC = 4.5V, VIN = 2.4V, ION = 15mA VCC = 4V, VIN = 2.4V, ION = 15mA 5 10 14 7 15 20 mV Typ.(2) M ax. Units V
High Impedence Output Current VCC = Max., VOUT = 0V or VCC Low Impedence Output Current VCC = Max., VOUT = 0V or VCC Input Hysteresis at Control Pins
Capacitance (TA = 25C, f = 1 MHz)
Parameters(4) 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. 3 5 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. 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.
2
PS8368B
01/11/01
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3308 2-Bit Bus Switch with Active Low Enable
Power Supply Characteristics
Parameters Description ICC ICC Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Test Conditions(1) VCC = Max. VCC = Max. VIN = GND or VCC VIN = 3.4V
(3)
Min.
Typ.(2) 0.1
Max. 3.0 2.5
Units A mA
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.
Switching Characteristics over Operating Range
PI3C3308 Parame te rs De s cription Conditions (1) VCC = 4.5V M in. tPLH tPHL tPZH tPZL tPHZ tPLZ Propogation Delay(2,3) A to B, B to A Bus Enable Time Bus Disable Time C L = 50pF RL = 500 -- 1. 0 1 M ax. 0.25 4.9 4.2 VCC = 4V M in. M ax. 0.25 5.5 4.5 ns 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.
Ordering Information
Part PI5C3308W Pin - Package 8 - SOIC (W) Te mpe rature -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
3
PS8368B 01/11/01

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