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PI5C3125C PI5C3126C
4-Bit BusSwitch with 2V Undershoot Protection
Product Features
RON is 5ohm typical Undershoot protection on A port only: 2V Direct bus connection when switches are ON Industrial Operation Temperature: 40C to +85C Near zero propagation delay Low Channel ON Capacitance: 14pF max. Packages available: 14-pin 173 mil wide plastic TSSOP (L) 14-pin 150 mil wide plastic SOIC (W) 16-pin 150 mil wide plastic QSOP (Q)
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading performance. The PI5C3125C and PI5C3126C are 5V, 4-bit, 2-port bus switches. They are intended for PCI Hot-Plug applications. Industry leading advantages include a propagation delay of 250ps, resulting from its 5-ohm channel resistance and low I/O capacitance. The A-ports switch data to B outputs and are bidirectional. The PI5C3125C device has active LOW enables, and the PI5C3126C has active HIGH enables. The A-port can handle up to 2V undershoot when the switch is disabled.
Applications
PCI Hot Plugging for live insertion Memory bank sharing
PI5C3125C Logic Block Diagram
A0 BE0 A1 BE1 A2 BE2 A3 BE3 B3 B2 B1 B0
PI5C3126C Logic Block Diagram
A0 BE0 A1 BE1 A2 BE2 A3 BE3 B3 B2 B1 B0
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PI5C3125C/3126C 4-Bit Bus Switch with 2V Undershoot Protection
PI5C3125 14-Pin Configuration
BE0 A0 B0 BE1 A1 B1 GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Vcc BE3 A3 B3 BE2 A2 B2
PI5C3126 14-Pin Configuration
BE0 A0 B0 BE1 A1 B1 GND 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Vcc BE3 A3 B3 BE2 A2 B2
14-Pin L,W
14-Pin L,W
PI5C3125 16-Pin Configuration
NC BE0 A0 B0 BE1 A1 B1 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Vcc BE3 A3 B3 BE2 A2 B2 NC
PI5C3126 16-Pin Configuration
NC BE0 A0 B0 BE1 A1 B1 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Vcc BE3 A3 B3 BE2 A2 B2 NC
16-Pin Q
16-Pin Q
Product Pin Description
Pin Name BEn BEn A3-A0 B3-B0 VCC GND Description Switch Enable (PI5C3125C) Switch Enable (PI5C3126C) Bus A Bus B Power Ground
Truth Table(1)
PI5C3125C PI5C3126C BEn BEn An X* X Hi-Z H L Hi-Z L H Bn Bn Hi-Z Hi-Z An V CC GND VCC VCC Function Disconnect Disconnect Connect
Notes: 1. H = High Voltage Level, L = Low Voltage Level HI-Z = High Impedance, X = Dont Care * A pull-up resistor should be provided for power-up protection.
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.
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PI5C3125C/3126C 4-Bit Bus Switch with 2V Undershoot Protection
DC Electrical Characteristics (Over the Operating Range, TA = 40C to +85C, VCC = 5V 10%)
Parameters Description VIH VIL IIH IIL IOZH VIK VUP RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Undershoot Protection Voltage(3) Switch On Resistance(4) Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 A, B VCC VCC = Min., IIN = 18mA Max Inputs, Undershoot Pulse Duration <25ns VCC = Min., VIN = 0.0V, ION = 48mA VCC = Min., VIN = 2.4V, ION = 15mA 5 10 Min. 2.0 0.5 0.8 1 1 1 1.8 2.0 7 15 Typ(2) Max. Units V V A A A V V ohm
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. Max. 6 6 8 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. 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.
Power Supply Characteristics
Parameters Description ICC ICC Quiescent Power Supply Current Supply Current per Input @ TTL HIGH VCC = Max. VCC = Max. Test Conditions(1) VIN = GND or VCC VIN = 3.4V(3) Min. Typ(2) Max. 100 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.
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PI5C3126C Switching Characteristics over Operating Range
PI5C3126C Com Parame te rs tPLH tPHL tPZH tPZL tPHZ tPLZ De s cription Propagation Delay(2,3) A to B, B to A Bus Enable Time Bus Disable Time CL = 50pF RL = 500ohm 0.5 0.5 Conditions M in. M ax. 0.25 6.6 6.0 ns Units
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PI5C3125C/3126C 4-Bit Bus Switch with 2V Undershoot Protection
PI5C3125C Switching Characteristics over Operating Range
PI5C3125C Com Parame te rs tPLH tPHL tPZH tPZL tPHZ tPLZ D e s cription Propagation Delay(2,3) A to B, B to A Bus Enable Time Bus Disable Time CL = 50pF RL = 500ohm 0.5 0.5 Conditions M in. M ax. 0.25 6.6 6.0 ns Units
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 0.25ns 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 +5.5V regardless of the supply voltage. For example, given a +5.0V supply, BE, maybe driven LOW to 0V and HIGH to 5.5V. Driving BE Rail-to-Rail(R) minimizes power consumption. Power-Supply Sequencing Proper power-supply sequencing is recommended for all CMOS devices. Always apply Vcc before applying signals to the input/ output or control pins.
(R)Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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PI5C3125C/3126C 4-Bit Bus Switch with 2V Undershoot Protection
14-Pin SOIC (W)
14
.149 .157
3.78 3.99 .0099 .0196 0.25 x 45 0.50
1
.336 .344 8.55 8.75
0-8 0.41 1.27 .2284 .2440 5.80 6.20 .016 .050
.0075 .0098
0.19 0.25
.0155 .026 0.393 0.660 REF
.053 .068
1.35 1.75 SEATING PLANE
.050 BSC 1.27
.013 .020 0.330 0.508
.0040 0.10 .0098 0.25
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
16-Pin QSOP (Q)
16
.150 .157
3.81 3.99 .015 x 45 0.38
1 .189 .197 4.80 5.00
.007 .010 0.41 .016 1.27 .050 .228 .244 5.79 6.19 SEATING PLANE .004 0.101 .010 0.254 X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
0.178 0.254
.008 0.203 REF
.053 1.35 .069 1.75
.025 BSC 0.635
.008 .012 0.203 0.305
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PI5C3125C/3126C 4-Bit Bus Switch with 2V Undershoot Protection
14-Pin TSSOP (L)
14
0.169 0.177
4.3 4.5
1 0.193 0.201 4.90 5.10 0.047 1.20 max. SEATING PLANE 0.45 0.75 0.018 0.030 0.004 0.09 0.008 0.20
0.240 0.264 6.1 6.7
0.0256 typical 0.65
0.007 0.012 0.19 0.30
0.002 0.05 0.006 0.15
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Pericom Semiconductor Corporation 2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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