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PI5C3251
8:1 Mux/DeMux BusSwitch
1 2 3 4 5
Features:
* Near-Zero propagation delay * 5 switches connect inputs to outputs * Direct bus connection when switches are ON * Ultra Low Quiescent Power (0.2 A Typical) - Ideally suited for notebook applications * Pin compatible with 74 series 251 logic devices * Packaging (Pb-free & Green available): - 16-pin 150-mil wide plastic QSOP (Q) - 16-pin 300-mil wide plastic SOIC (S) - 16-pin 150-mil wide plastic SOIC (W) - 16-pin 173-mil wide plastic TSSOP (L)
Description:
Pericom Semiconductor's PI5C3251 is a Dual 8:1 Multiplexer/ demultiplexer with three-state outputs that is pinout compatible with the PI74FCT251T, 74F251, and 74ALS/AS/LS 251. Inputs can be connected to outputs with low on resistance (5) with no additional ground bounce noise or propagation delay.
Block Diagram
I0 I1 I2 I3 I4 I5 I6 I7
Pin Configuration
I3 I2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC I4 I5 I6 I7 S0 S1 S2
6 7 8 9 10 11
Description
E S0 S1 S2
I1 I0 Y NC E Y GND
Truth Table(1)
E H L L L L L L L L Select S2 S1 X X L L L L L H L H H L H L H H H H S0 X L H L H L H L H Y Hi-Z I0 I1 I2 I3 I4 I5 I6 I7 Function Disable S2-0 = 0 S2-0 = 1 S2-0 = 2 S2-0 = 3 S2-0 = 4 S2-0 = 5 S2-0 = 6 S2-0 = 7
Pin Description
Pin Name I0-7 S0-2 E Y GND VCC Data Inputs Select Inputs Enable Data Outputs Ground Power
12 13 14 15
Note: 1. H = High Voltage Level, L = Low Voltage Level 1
PS7016B 09/14/04
PI5C3251 8:1 Mux/DeMux 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 +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.....................................................................................120 mA 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 5%)
Parameters VIH VIL IIH IIL IOZH VIK IOS VH RON Description Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Short Circuit Current(3) Input Hysteresis at Control Pins Switch On-Resistance(4) VCC = Min., VIN = 0.0V, ION = 48 mA VCC = Min., VIN = 2.4V, ION = 15 mA Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 I, Y VCC VCC = Min., IIN = -18 mA I (Y) = 0V, Y (I) = VCC 100 150 5 10 7 15 -0.7 Min. 2.0 -0.5 0.8 1 1 1 -1.2 V mA mV A Typ(2) Max. Units V
Capacitance (TA = 25C, f = 1 MHz)
Parameters(5) Description Input Capacitance I0 - I7 Capacitance, Switch Off Y Capacitance, Switch Off I0 - I7 Capacitance, Switch On VIN = 0V 35 Test Conditions Typ. Max. 6 6 48 54 pF Units CIN CI(OFF) CY(OFF) CI(ON)
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. 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 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. 5. This parameter is determined by device characterization but is not production tested.
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PI5C3251 8:1 Mux/DeMux BusSwitch Power Supply Characteristics
Parameters ICC ICC Description Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) VCC = Max. VCC = Max. VCC = Max., I and Y Pins Open E = GND Control Input Toggling 50% Duty Cycle Test Conditions(1) VIN = GND or VCC VIN = 3.4V(3) Min. Typ(2) 0.1 Max. Units 3.0 2.5 A mA
ICCD
0.25
mA/ MHz
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); 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(2,3) In to Y Bus Select Time Sn to Y Bus Enable Time E to Y Bus Disable Time E to Y CL = 50 pF RL = 500 0.5 0.5 0.5 Conditions(1) Com. Min. Max. 0.25 6.6 ns 6.0 6.0 Unit
Notes: 1. See test circuit and wave forms. 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 0.25 ns for 50 pF 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
PS7016B
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PI5C3251 8:1 Mux/DeMux BusSwitch 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
.008 0.203 REF
.053 1.35 .069 1.75
Detail A
.007 .010
0.178 0.254
SEATING PLANE
.004 0.101 .010 0.254
0.41 .016 1.27 .050
.025 BSC 0.635
.008 .012 0.203 0.305
.228 .244 5.79 6.19
X.XX DENOTES DIMENSIONS IN MILLIMETERS X.XX
Packaging Mechanical: 16-pin SOIC (S)
16
.2914 .2992
7.40 7.60
.010 0.254 x 45 .029 0.737
1
.398 10.10 .413 10.50
.020 0.508 .030 0.762
0-8
.0926 2.35 .1043 2.64
SEATING PLANE
.0091 0.23 .0125 0.32
0.41 .016 1.27 .050
.394 .419 10.00 10.65
.050 BSC 1.27
.013 .020 0.33 0.51
.0040 .0118
0.10 0.30
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
4
PS7016B
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PI5C3251 8:1 Mux/DeMux BusSwitch Packaging Mechanical: 16-pin SOIC (W)
16
.149 .157
3.78 3.99
.0099 .0196
0.25 x 45 0.50
1
.386 .393 9.80 10.00
.0155 .0260 0.393 0.660 REF
0-8
0.41 1.27
.016 .050
.0075 .0098
0.19 0.25
.053 .068
1.35 1.75
SEATING PLANE
.2284 .2440 5.80 6.20
.050 BSC 1.27
.013 .020 0.330 0.508
.0040 0.10 .0098 0.25
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Packaging Mechanical: 16-pin TSSOP (L)
16
.169 .177
4.3 4.5
1
.193 .201 4.9 5.1
.004 .008
.047 max. 1.20
0.09 0.20
0.45 .018 0.75 .030
SEATING PLANE
.252 BSC 6.4
.0256 BSC 0.65
.007 .012
0.19 0.30
.002 .006
0.05 0.15
X.XX DENOTES CONTROLLING X.XX DIMENSIONS IN MILLIMETERS
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PS7016B
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PI5C3251 8:1 Mux/DeMux BusSwitch Ordering Information
Ordering Code PI5C3251Q PI5C3251QE PI5C3251S PI5C3251SE PI5C3251W PI5C3251WE PI5C3251L PI5C3251LE Package Code Q Q S S W W L L Package Description 16-pin 150-mil wide QSOP Pb-free & Green, 16-pin 150-mil wide QSOP 16-pin 300-mil wide SOIC Pb-free & Green, 16-pin 300-mil wide SOIC 16-pin 150-mil wide SOIC Pb-free & Green, 16-pin 150-mil wide SOIC 16-pin 173-mil wide TSSOP Pb-free & Green, 16-pin 173-mil wide 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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PS7016B 09/14/04

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