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PI3B3257A
3.3V, Quad 2:1 Mux/DeMux NanoSwitchTM
Features
* Near-Zero propagation delay * 5 switches connect inputs to outputs * * * Fast Switching Speed: 4.8ns max. Ultra-Low Quiescent Power: 0.1A typical - Ideally suited for notebook applications Pin compatible with 74 series 257 logic devices
Description
Pericom Semiconductor's PI3B3257A is a 3.3 Volt, Quad 2:1 multiplexer/demultiplexer with three-state outputs that is pinout and function compatible with the PI74FCT257T, 74F257, and 74ALS/AS/LS257. Inputs can be connected to outputs with low On-Resistance (5) with no additional ground bounce noise or propagation delay.
* Packaging (Pb-free & Green avaliable): - 16-pin 150 mil wide plastic QSOP (Q)
Block Diagram
IA0
IA1 IB0
IB1 IC0
Pin Configuration
IC1 ID0
ID1
S
IA0
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC E
ID0 ID1
SW
SW
IA1
E
SW
SW
SW
YA
IB0
YD
IC0 IC1
S
SW
SW
SW
IB1
YB GND
SW
YC
YA
YB
YC
YD
I
Y
Pin Description
Pin Name
IA N -ID N
E
Description Data Inputs Select Inputs Enable Data Outputs Ground Power No Connect
Truth Table(1)
E H L L S X L H YA Hi-Z
IA 0 IA 1
S YB Hi-Z
IB0 IB1
YC Hi-Z
IC0 IC1
YD Hi-Z
ID 0 ID 1
Function Disable S=0 S=1
E YA-YD GND VCC NC
Note: 1. H = High Voltage Level L = Low Voltage Level
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PS8758A
02/24/05
PI3B3257A 3.3V, Quad 2:1 Mux/DeMux 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: 1. 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 VIH VIL IIH IIL IOZH VIK RON Description Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Switch On-Resistance(3) Test Conditions(1) Min. 2 -0.5 Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 In, Yn VCC VCC = Min., IIN = -18mA VCC = Min., VIN = 0.0V, Ion = 48mA or 64mA VCC = Min., VIN = 2.4V, ION = 15mA
Typ.(2)
Max. Units 0.8 1 1 1 -1.2 V A V
5 8
7 17
Capacitance (TA = 25C, f = 1 MHz)
Parameters CIN COFFYN COFFIN CON Description Input Capacitance YN Capacitance, Switch OFF IN Capacitance, Switch OFF IN/YN Capacitance, Switch ON VIN = 0V Test Conditions Typical 2 7.5 4.0 11 pF Units
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 I and Y pin at indicated current through the switch. On-Resistance is determined by the lower of the voltages on the two (I,Y) pins. 4. This parameter is determined by device characterization but is not production tested.
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PS8758A
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PI3B3257A 3.3V, Quad 2:1 Mux/DeMux NanoSwitchTM Power Supply Characteristics
Parameters ICC ICC Description Quiescent Power Supply Current Supply Current per Input @ TTL HIGH(3, 4) VCC = Max. VCC = Max.
Test Conditions(1) VIN = GND or VCC VIN = 3.0
Min.
Typ.(2) 0.1
Max. Units 3.0 750 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); I and Y 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 I and Y 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
Parameters tIY tSY tPZH tPZL tPHZ tPLZ Description Propagation Delay In to Yn(2,3) Bus Select Time, Sn to Yn Bus Enable Time, E to Yn Bus Disable Time, E to Yn CL = 50pF RL = 500 1 1 1 Conditions(1) Com. Min. Max. 0.25 4.5 4.5 4.8 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 switch's time constant 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 +3.6V 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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PS8758A
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PI3B3257A 3.3V, Quad 2:1 Mux/DeMux NanoSwitchTM Packaging Mechanical: 16-Pin QSOP (Q)
16
.008 0.20 MIN.
.150 .157
3.81 3.99
.008 .013 0.20 0.33
Guage Plane
.010 0.254
1
.189 .197 4.80 5.00
Detail A
.016 .035 0.41 0.89
.041 1.04 REF
0-6
.015 x 45 0.38
.053 1.35 .069 1.75
Detail A
.008 0.203 REF
.007 .010
0.178 0.254
SEATING PLANE
.004 0.101 .010 0.254
0.41 .016 1.27 .050
.228 .244 5.79 6.19
.025 BSC 0.635
.008 .012 0.203 0.305
X.XX DENOTES DIMENSIONS IN MILLIMETERS X.XX
Ordering Information
Ordering Code PI3B3257AQ PI3B3257AQE Packaging Code Q Q Package Description 16-pin 150-mil wide plastic QSOP Pb-Free & Green, 16-pin 150-mil wide plastic QSOP
Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation * 1-800-435-2336 * Fax (408) 435-1100 * www.pericom.com
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PS8758A 02/24/05

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