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PI3C3244
Product Features
Near zero propagation delay High Bandwidth (>400 MHz) Rail-to-Rail 3.3V or 2.5V Switching 5V I/O Tolerant 2.5V Supply Voltage Operation Permits Hot Insertion Pin compatible with 74 series 244 logic devices Packages available: 20-pin 150 mil wide plastic QSOP (Q) 20-pin 173 mil wide plastic TSSOP (L)
Product Description
2.5V/3.3V, High Bandwidth, Hot Insertion, 8-Bit, 2-Port Bus Switch
Pericom Semiconductors PI3C series of logic circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading performance. The PI3C3244 features a set of 2.5V or 3.3V 8-bit bus switches, which is a pinout and function compatible with the P74FCT244T, 74F244, and 74ALS/AS/LS2448-bit drivers. Two enable signals (BEn) turn the switches on similar to the enable signals of the 244. The bus switch create no additional propagation delay or ground bounce noise. It is very useful in switching signals that have high bandwidth (>400 MHz).
Logic Block Diagram
*-
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Product Pin Configuration
BE1
1A0 2B3 1A1 2B2 1A2 2B1 1A3 2B0
GND
1 20 2 19 3 18 4 20-Pin 17 5 L,Q 16 6 15 7 14 8 13 9 12 10 11
VCC BE2
1B0 2A3 1B1 2A2 1B2 2A1 1B3 2A0
Truth Table(1)
BE1 H L BE2 H H L L 1A, 1B Disconnect 1A = 1B Disconnect 1A = 1B 2A, 2B Disconnect Disconnect 2A = 2B 2A = 2B
Product Pin Description
Pin Name BEn A07 B07 GND VCC Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power
H L
Note: 1. H = High Voltage Level L = Low Voltage Level
1
PS8149B
12/10/99
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PI3C3244 2.5V/3.3V, High Bandwidth, Hot Insertion, 8-Bit, 2-Port Bus Switch
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Note: Storage Temperature..................................................... 65C to +150C Stresses greater than those listed under MAXIMUM Ambient Temperature with Power Applied ....................... 40C to +85C RATINGS may cause permanent damage to the device. Supply Voltage to Ground Potential .................................. 0.5V to +4.6V This is a stress rating only and functional operation of the device at these or any other conditions above those DC Input Voltage ............................................................... 0.5V to +5.5V indicated in the operational sections of this specification DC Output Current ......................................................................... 120mA is not implied. Exposure to absolute maximum rating Power Dissipation ............................................................................. 0.5W conditions for extended periods may affect reliability.
1 2 3 4
DC Electrical Characteristics (Over Operating Range, TA = -40C to +85C, VCC = 3.3V 10%)
Parameters Description VIH VIL IIH IIL IOZH VIK RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Clamp Diode Voltage Switch On Resistance(4) Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND VCC = Min., IIN = -18mA VCC = Min., VIN = 0.0V, ION = 48mA or 64mA VCC = Min., VIN = 2.4V, ION = 15mA -0.73 5 8 Min. 2.0 -0.5 0.8 1 1 1 -1.2 7 15 V A Typ.(2) Max. Units V
5 6 7 8
High Impedance Output Current 0 A, B VCC
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. 3.5 5.0 10.0 Units pF
9 10 11 12 13 14 15
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. 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
PS8149B
12/10/99
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PI3C3244 2.5V/3.3V, High Bandwidth, Hot Insertion, 8-Bit, 2-Port Bus Switch
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. 260 500 A 750 Units
1 2 3 4 5
Units
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 input only); A and B pins do not contribute to ICC.
Switching Characteristics over 3.3V Operating Range
PI3C3244 Com. Min. Max. 0.25 1.5 CL = 50 pF, RL = 500, R = 500 1.5 6.5 5.5 ns
Parameters Description tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Ax to Bx Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx Delay(2,3)
Conditions(1) CL = 50 pF, RL = 500
6 7 8
Units
Switching Characteristics over 2.5V Operating Range
PI3C3244 Com. Min. Max. 0.25 1.5 CL = 50 pF, RL = 500, R = 500 1.5 9.8 8.3 ns
Parameters Description t PLH t PHL t PZH t PZL t PHZ tPLZ Propagation Delay Ax to Bx Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx
(2,3)
Conditions(1) CL = 50 pF, RL = 500
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.
3
PS8149B
12/10/99
VOUT, (V)
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PI3C3244 2.5V/3.3V, High Bandwidth, Hot Insertion, 8-Bit, 2-Port Bus Switch
4.0
1
VCC = 3.3V 3.1V 2.9V 2.7V 2.5V 2.3V 3.8V 3.6V 3.4V 3.2V 3.0V 2.8V
2 3 4 5 6
2.0
0.0 0.0
1.0
2.0 VIN, (V)
3.0
4.0
5.0
Output Voltage vs. Input Voltage over Various Supply Voltages Output Voltage vs. Input Voltageover Various Supply Voltages
7 8
Ordering Information
Part PI3C3244L PI3C3244Q Pin-Package 20- TSSO P (L) 20- Q SO P (Q ) Te mpe rature 40C to +85C 40C to +85C
9 10 11 12 13 14 15
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
4
PS8149B 12/10/99

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