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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B3244
3.3V, Hot Insertion, 8-Bit, 2-Port NanoSwitchTM
Features
Near-Zero propagation delay 5-ohm switches connect inputs to outputs when enabled Fast Switching Speed - 4.5ns max. Ultra-Low Quiescent Power (0.2A Typical) - Ideally suited for notebook applications * Pin compatible with 74 series 244 logic devices * Packaging: - 20-pin 150-mil wide plastic QSOP (Q) - 20-pin 173-mil wide plastic TSSOP (L) * * * *
Description
Pericom Semiconductor's PI3B series of logic circuits are produced using the Company's advanced sub-micron CMOS technology, achieving industry leading performance. The PI3B3244 features a set of 3.3V 8-bit bus switches, which is 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.
Block Diagram
BE1
1A0 1A1 1A2 1A3
SW
Pin Configuration
BE1
1B0 1B1 1B0 1B1
A
SW
SW
SW
B
SW
1A0 2B3 1A1 2B2 1A2 2B1 1A3 2B0
GND
20 1 19 2 18 3 17 4 5 20-Pin 16 Q,L 15 6 14 7 13 8 12 9 11 10
Vcc BE2
1B0 2A3 1B1 2A2 1B2 2A1 1B3 2A0
BE2
2A0 2A1 2A2 2A3
SW
2B0 2B1 2B2 2B3
BE
Pin Description
Pin Name BEn A0-7 B0-7 GND VCC Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power
SW
SW
SW
Truth Table(1)
BE1 H L H L BE2 H H L L 1A, 1B Disconnect 1A = 1B Disconnect 1A = 1B 2A, 2B Disconnect Disconnect 2A = 2B 2A = 2B
Note: 1. H = High Voltage Level, L = Low Voltage Level
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PS8149F 08/25/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B3244 3.3V, Hot Insertion 8-Bit, 2-Port NanoSwitchTM
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 ................................................. -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.
DC Electrical Characteristics (Over the 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
(3)
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
Min. 2.0 -0.5
Typ(2)
Max. 0.8 1 1 1 -1.2
Units V V A A A V
High Impedance Output Current 0 IN, YN VCC 5 10
8 17
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. 3.0 8.0 16.0 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 = 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.
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PS8149F
08/25/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B3244 3.3V, Hot Insertion 8-Bit, 2-Port NanoSwitchTM
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 = 3.0V(3) Min. Typ(2) 0.1 Max. 3.0 750 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 TTL driven input (control inputs only); A and B pins do not contribute to ICC.
Switching Characteristics over Operating Range
Conditions(1)
(2,3)
Parameters Description tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay Ax to Bx Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx
PI3B3244 Com. Min. Max. 0.25 1.0 1.0 4.0 4.5
Units ns ns ns
CL = 50 pF, RL = 500 CL = 50 pF, RL = 500, RL = 500
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.
Applications Information Logic Inputs
The logic control inputs can be driven up to +3.6 regardless of the supply voltage. For example, given a + 3.3V supply, IN may be driven low to 0V and high to 3.6V. Driving IN Rail-to-Rail(R) minimizes power consumption.
Power-Supply Sequencing and Hot-Plug Information
Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC and GND before applying signals to input/output or control pins.
Rail-to-Rail is a registeredtrademark of Nippon Motorola, Ltd
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PS8149F
08/25/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B3244 3.3V, Hot Insertion 8-Bit, 2-Port NanoSwitchTM
Packaging Mechanical: 20-Pin QSOP (Q)
20
.008 0.20 MIN.
.150 .157
3.81 3.99
Guage Plane
.008 .013 0.20 0.33
.010 0.254
1 .337 8.56 .344 8.74
Detail A
.016 .035 0.41 0.89
.041 1.04 REF
0-6
.058 REF 1.47
.053 1.35 .069 1.75 SEATING PLANE
.015 x 45 0.38
Detail A
.007 .010 .016 .050 0.41 1.27
0.178 0.254
.025 BSC 0.635
.004 0.101 .010 0.254 .008 0.203 .012 0.305
.228 .244 5.79 6.19
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Packaging Mechanical: 20-Pin TSSOP (L)
20
.169 .177
4.3 4.5
1 .252 .260 6.4 6.6 .004 0.09 .008 0.20 .047 1.20 Max 0.45 0.75 .018 .030
SEATING PLANE
.238 .269 6.1 6.7
.0256 BSC 0.65
.007 .012 0.19 0.30
.002 0.05 .006 0.15
X.XX X.XX
DENOTES CONTROLLING DIMENSIONS IN MILLIMETERS
Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com
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PS8149F 08/25/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B3244 3.3V, Hot Insertion 8-Bit, 2-Port NanoSwitchTM
Ordering Information
Ordering Code PI3B3244Q PI3B3244QE PI3B3244L PI3B3244LE Package Code Q Q L L Package Type 20-pin QSOP Pb-free & Green, 20-pin QSOP 20-pin TSSOP Pb-free & Green, 20-pin TSSOP
Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com
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PS8149F 08/25/04

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