PI3B3251 PERICOM | Alldatasheet
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Technical content
1 PS8150D 05/15/01
3.3V , 8:1 Mux/Demux BusSwitch 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 Product Features
- Near zero propagation delay 5 Ohm switches connect inputs to outputs Ultra Low Quiescent Power (0.1µA Typical) – Ideally suited for notebook applications Pin compatible with 74 series 251 logic devices Packages available: – 16-pin 150 mil wide plastic QSOP (Q) – 16-pin 150 mil wide plastic SOIC (W) – 16-pin 173 mil wide plastic TSSOP (L) Select ES 2 S1 S0 Y Function HXXX Hi-Z Disable LLLL I 0 S2-0 = 0 L L L H I1 S2-0 = 1 L L H L I2 S2-0 = 2 L L H H I3 S2-0 = 3 L H L L I4 S2-0 = 4 L H L H I5 S2-0 = 5 L H H L I6 S2-0 = 6 L H H H I7 S2-0 = 7 Truth Table(1) Logic Block Diagram Product 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 PI3B3251 is a 3.3V 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 Ohm) with no additional ground bounce noise or propagation delay. Product Pin Configuration Product Pin Description Pin Name Description I0–7 Data Inputs S0–2 Select Inputs E Enable Y Data Outputs GND Ground VCC Power Note: 1. H = High Voltage Level L = Low Voltage Level VCCI3 1 I4I2 2 I5I1 3 I6I0 4 I7Y 5 S0NC 6 S1E 7 S28 GND 16-Pin Q, W, L E I1 I2 I3 I4 I5 I6 I7 Y
3.3V, 8:1 Mux/Demux BusSwitch
2 PS8150D 05/15/01
1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 Capacitance (TA = 25°C, f = 1 MHz) Parameters(5) Description Test Conditions Typ. Units CIN Input Capacitance V IN = 0V 3.0 pF CI(OFF) I0 - I7 Capacitance, Switch Off V IN = 0V 8.0 pF CY(OFF) Y Capacitance, Switch Off V IN = 0V 64.0 pF CI(ON) I0 - I7 Capacitance, Switch On V IN = 0V 72.0 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 = 25°C 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. 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. Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Parameters Description Test Conditions (1) Min. Typ (2) Max. Units VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V VIL Input LOW Voltage Guaranteed Logic LOW Level –0.5 0.8 V IIH Input HIGH Current V CC = Max., VIN = VCC ±1 µA IIL Input LOW Current V CC = Max., VIN = GND ±1 µA IOZH High Impedance Output Current 0 ≤ IN, YN ≤ VCC ±1 µA VIK Clamp Diode Voltage V CC = Min., IIN = –18mA –1.2 V RON Switch On Resistance(3) VCC = Min., VIN = 0.0V, ION = 48mA or 64mA 5 8 Ω VCC = Min., VIN = 2.4V, ION = 15mA 10 17
3.3V, 8:1 Mux/Demux BusSwitch
3 PS8150D 05/15/01
1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 PI3B3251 Com. Parameters Description Conditions (1) Min. Max. Units tPD Propagation Delay(2,3) CL = 50pF 0.25 In to Y R L = 500Ω tSY Bus Enable Time C L = 50pF RL = 500Ω 1 4.5 Sn to Y tPZH Bus Enable Time C L = 50pF RL = 500Ω 1 3.5 tPZL E to Y tPHZ Bus Disable Time C L = 50pF RL = 500Ω 1 5.5 tPLZ E to Y Power Supply Characteristics Parameters Description Test Conditions (1) Min. Typ.(2) Max. Units ICC Quiescent Power V CC = Max. V IN = GND or VCC 0.1 3 µA Supply Current ∆∆∆∆∆ICC Supply Current per V CC = Max. V IN = 3.0V(3) 750 µA Input @ TTL HIGH Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at V CC = 3.3V, +25°C ambient. 3. Per TTL driven input (control input only); I and Y pins do not contribute to ICC. Switching Characteristics over Operating Range 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. Pericom Semiconductor Corporation 2380 Bering Drive • San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com ns rebmuNtraPe gakcaP/niPe rutarepmeT Q1523B3IP) Q(POSQ-61C °58+otC°04– W1523B3IP) W(CIOS-61C °58+otC°04– L1523B3IP) L(POSST-61C °58+otC°04–