Revised September 2000 74LCX257 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs and Outputs General Description Features The LCX257 is a quad 2-input multiplexer with 3-STATE outputs. Four bits of data from two sources can be selected using a Common Data Select input. The four outputs present the selected data in true (non inverted) form. The outputs may be switched to a high impedance state by placing a logic HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems. 5V tolerant inputs and outputs The 74LCX257 is fabricated with advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. 2.3V-3.6V VCC specifications provided 6.0 ns tPD max (VCC = 3.3V, In Zn), 10 A ICC max Power down high impedance inputs and outputs Supports live insertion/withdrawal (Note 1) Implements patented noise/EMI reduction circuitry Latch-up performance exceeds 500 mA ESD performance: Human body model > 2000V Machine model > 200V Note 1: To ensure the high-impedance state during power up or down, OE should be tied to VCC through a pull-up resistor: the minimum value or the resistor is determined by the current-sourcing capability of the driver. Ordering Code: Order Number 74LCX257M 74LCX257SJ 74LCX257MTC Package Number Package Description M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Logic Symbols Connection Diagram IEEE/IEC Pin Descriptions Pin Names (c) 2000 Fairchild Semiconductor Corporation DS012466 Description S Common Data Select Input OE 3-STATE Output Enable Input I0a-I0d Data Inputs from Source 0 I1a-I1d Data Inputs from Source 1 Za-Zd 3-STATE Multiplexer Outputs www.fairchildsemi.com 74LCX257 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs and Outputs May 1995 74LCX257 Functional Description Truth Table The LCX257 is a quad 2-input multiplexer with 3-STATE outputs. It selects four bits of data from two sources under control of a Common Data Select input. When the Select input is LOW, the I0x inputs are selected and when Select is HIGH, the I1x inputs are selected. The data on the selected inputs appears at the outputs in true (non inverted) form. The device is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Output Select Data Enable Input Inputs Outputs OE S I0 I1 Z H X X X Z L H X L L L H X H H Za = OE * (11a * S + I0a * S) L L L X L Zb = OE * (11b * S + I0b * S) L L H X H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Zc = OE * (11c * S + I0c * S) Zd = OE * (11d * S + I0d * S) When the Output Enable (OE) is HIGH, the outputs are forced to a high impedance state. If the outputs are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. Designers should ensure the Output Enable signals to 3-STATE devices whose outputs are tied together are designed so there is no overlap. Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 Symbol Parameter Value VCC Supply Voltage -0.5 to +7.0 VI DC Input Voltage -0.5 to +7.0 VO DC Output Voltage -0.5 to +7.0 Conditions Units V V Output in 3-STATE -0.5 to VCC + 0.5 Output in HIGH or LOW State (Note 2) IIK DC Input Diode Current -50 VI < GND IOK DC Output Diode Current -50 VO < GND +50 VO > VCC V mA mA IO DC Output Source/Sink Current 50 mA ICC DC Supply Current per Supply Pin 100 mA IGND DC Ground Current per Ground Pin 100 mA TSTG Storage Temperature -65 to +150 C Recommended Operating Conditions (Note 4) Symbol VCC Parameter Supply Voltage VI Input Voltage VO Output Voltage IOH/IOL Output Current TA Free-Air Operating Temperature t/V Input Edge Rate, VIN = 0.8V-2.0V, VCC = 3.0V Min Max Operating 2.0 3.6 Data Retention 1.5 3.6 0 5.5 HIGH or LOW State 0 VCC 3-STATE 0 5.5 VCC = 3.0V - 3.6V 24 VCC = 2.7V - 3.0V 12 VCC = 2.3V - 2.7V 8 Units V V V mA -40 85 C 0 10 ns/V Note 2: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Note 3: IO Absolute Maximum rating must be observed. Note 4: Unused Inputs must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VIH VIL VOH VOL Parameter Conditions HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage IOH = -100 A VCC (V) TA = -40C to +85C Min 2.3 - 2.7 1.7 2.7 - 3.6 2.0 Max V 2.3 - 2.7 0.7 2.7 - 3.6 0.8 2.3 - 3.6 Units V VCC - 0.2 IOH = -8 mA 2.3 1.8 IOH = -12 mA 2.7 2.2 IOH = -18 mA 3.0 2.4 IOH = -24 mA 3.0 2.2 IOL = 100 A 2.3 - 3.6 0.2 IOL = 8 mA 2.3 0.6 IOL = 12 mA 2.7 0.4 IOL = 16 mA 3.0 0.4 V V IOL = 24 mA 3.0 0.55 II Input Leakage Current 0 VI 5.5V 2.3 - 3.6 5.0 A IOZ 3-STATE Output Leakage 0 VO 5.5V 2.3 - 3.6 5.0 A 0 10 A VI = V IH or VIL IOFF Power-Off Leakage Current VI or VO = 5.5V 3 www.fairchildsemi.com 74LCX257 Absolute Maximum Ratings(Note 1) 74LCX257 DC Electrical Characteristics Symbol (Continued) Parameter VCC Conditions TA = -40C to +85C (V) ICC ICC Quiescent Supply Current Increase in ICC per Input Min Units Max VI = VCC or GND 2.3 - 3.6 10 3.6V VI, VO 5.5V (Note 5) 2.3 - 3.6 10 VIH = VCC -0.6V 2.3 - 3.6 500 A A Note 5: Outputs disabled or 3-STATE only. AC Electrical Characteristics TA = -40C to +85C, RL = 500 Symbol Parameter VCC = 3.3V 0.3V VCC = 2.7V VCC = 2.5V 0.2V CL= 50 pF CL = 50 pF CL= 30 pF Min Max Min Max Min Max tPHL Propagation Delay 1.5 7.0 1.5 8.5 1.5 9.1 tPLH SZn 1.5 7.0 1.5 8.5 1.5 9.1 tPHL Propagation Delay 1.5 6.0 1.5 6.5 1.5 7.2 tPLH InZn 1.5 6.0 1.5 6.5 1.5 7.2 tPZL Output Enable Time 1.5 7.0 1.5 8.5 1.5 9.1 tPZH OE Zn 1.5 7.0 1.5 8.5 1.5 9.1 tPLZ Output Disable Time 1.5 5.5 1.5 6.0 1.5 6.6 tPHZ OE Zn 1.5 5.5 1.5 6.0 1.5 6.6 tOSHL Output to Output Skew (Note 6) 1.0 ns ns ns ns ns 1.0 tOSLH Units Note 6: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Dynamic Switching Characteristics Symbol VOLP VOLV VCC TA = 25C (V) Typical CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.8 CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.6 CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 -0.8 CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 -0.6 Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Conditions Units V V Capacitance Typical Units CIN Symbol Input Capacitance Parameter VCC = Open, VI = 0V or VCC 7 pF COUT Output Capacitance VCC = 3.3V, VI = 0V or VCC 8 pF CPD Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, f = 10 MHz 25 pF www.fairchildsemi.com Conditions 4 74LCX257 AC LOADING and WAVEFORMS Generic for LCX Family FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance) Test Switch tPLH, tPHL Open tPZL, tPLZ 6V at VCC = 3.3 0.3V VCC x 2 at VCC = 2.5 0.2V tPZH,tPHZ GND Waveform for Inverting and Non-Inverting Functions 3-STATE Output High Enable and Disable Times for Logic Propagation Delay. Pulse Width and trec Waveforms Setup Time, Hold Time and Recovery Time for Logic trise and tfall 3-STATE Output Low Enable and Disable Times for Logic FIGURE 2. Waveforms (Input Characteristics; f =1MHz, tR = tF = 3ns) Symbol VCC 3.3V 0.3V 2.7V 2.5V 0.2V Vmi 1.5V 1.5V VCC/2 Vmo 1.5V 1.5V VCC/2 Vx VOL + 0.3V VOL + 0.3V VOL + 0.15V Vy VOH - 0.3V VOH - 0.3V VOH - 0.15V 5 www.fairchildsemi.com 74LCX257 Schematic Diagram Generic for LCX Family www.fairchildsemi.com 6 74LCX257 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A 7 www.fairchildsemi.com 74LCX257 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D www.fairchildsemi.com 8 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 9 www.fairchildsemi.com 74LCX257 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs and Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued)