Revised February 2001 74LCX157 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs General Description Features The LCX157 is a high-speed quad 2-input multiplexer. Four bits of data from two sources can be selected using the common Select and Enable inputs. The four outputs present the selected data in the true (noninverted) form. The LCX157 can also be used as a function generator. ■ 5V tolerant inputs The 74LCX157 is fabricated with advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. ■ 2.3V–3.6V VCC specifications provided ■ 5.8 ns tPD max (VCC = 3.3V), 10 µA ICC max ■ Power down high impedance inputs and outputs ■ ±24 mA output drive (VCC = 3.0V) ■ Implements patented noise/EMI reduction circuitry ■ Latch-up performance exceeds 500 mA ■ ESD performance: Human body model > 2000V Machine model > 200V Ordering Code: Order Number 74LCX157M 74LCX157SJ 74LCX157MTC 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 © 2001 Fairchild Semiconductor Corporation DS012465 Pin Names Description I0a–I0d Source 0 Data Inputs I1a–I1d Source 1 Data Inputs E Enable Input S Select Input Za–Zd Outputs www.fairchildsemi.com 74LCX157 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs May 1995 74LCX157 Functional Description Truth Table The LCX157 is a quad 2-input multiplexer. It selects four bits of data from two sources under the control of a common Select input (S). The Enable input (E) is active-LOW. When E is HIGH, all of the outputs (Z) are forced LOW regardless of all other inputs. The LCX157 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: Inputs Outputs E S I0 I1 H X X X L L H X L L L H X H H Za = E • (I1a • S + I0a • S) L L L X L Zb = E • (I1b • S + I0b • S) L L H X H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Zc = E • (I1c • S + I0c • S) Zd = E • (I1d • S + I0d • S) A common use of the LCX157 is the moving of data from two groups of registers to four common output busses. The particular register from which the data comes is determined by the state of the Select input. A less obvious use is as a function generator. The LCX157 can generate any four of the sixteen different functions of two variables with one variable common. This is useful for implementing gating functions. 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 Z Symbol Parameter Value Conditions VCC Supply Voltage −0.5 to +7.0 VI DC Input Voltage −0.5 to +7.0 VO DC Output Voltage IIK DC Input Diode Current −50 VI < GND IOK DC Output Diode Current −50 VO < GND +50 VO > VCC Units V V −0.5 to VCC + 0.5 Output in HIGH or LOW State (Note 2) 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 3) Symbol VCC Parameter Supply Voltage Min Max Operating 2.0 3.6 Data Retention 1.5 3.6 VI Input Voltage VO Output Voltage HIGH or LOW State IOH/IOL Output Current VCC = 3.0V − 3.6V ±24 VCC = 2.7V − 3.0V ±12 VCC = 2.3V − 2.7V ±8 TA Free-Air Operating Temperature ∆t/∆V Input Edge Rate, VIN = 0.8V − 2.0V, VCC = 3.0V Units V 0 5.5 V 0 VCC V mA −40 85 °C 0 10 ns/V Note 1: 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 2: IO Absolute Maximum Rating must be observed. Note 3: 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 µA VCC TA = −40°C to +85°C (V) Min 2.3 − 2.7 1.7 2.7 − 3.6 2.0 Units Max V 2.3 − 2.7 0.7 2.7 − 3.6 0.8 2.3 − 3.6 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 µA 2.3 − 3.6 0.2 IOH = 8 mA 2.3 0.6 IOL = 12 mA 2.7 0.4 IOL = 16 mA 3.0 0.4 V V V IOL = 24 mA 3.0 0.55 II Input Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA IOFF Power-Off Leakage Current VI or VO = 5.5V 0 10 µA ICC Quiescent Supply Current ∆ICC Increase in ICC per Input VI = V CC or GND 2.3 − 3.6 10 3.6V ≤ VI ≤ 5.5V 2.3 − 3.6 ±10 VIH = VCC −0.6V 2.3 − 3.6 500 3 µA µA www.fairchildsemi.com 74LCX157 Absolute Maximum Ratings(Note 1) 74LCX157 AC Electrical Characteristics TA = −40°C to +85°C, RL = 500Ω 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 8.0 1.5 8.4 tPLH S→Zn 1.5 7.0 1.5 8.0 1.5 8.4 tPHL Propagation Delay 1.5 7.0 1.5 8.0 1.5 8.4 tPLH E→Zn 1.5 7.0 1.5 8.0 1.5 8.4 tPHL Propagation Delay 1.5 5.8 1.5 6.3 1.5 7.0 tPLH In→Zn 1.5 5.8 1.5 6.3 1.5 7.0 tOSHL Output to Output Skew 1.0 tOSLH (Note 4) 1.0 Units ns ns ns ns Note 4: 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). Parameter guaranteed by design. Dynamic Switching Characteristics Symbol VOLP VOLV Parameter Quiet Output Dynamic Peak VOL Quiet Output Dynamic Valley VOL Conditions VCC TA = 25°C (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 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 74LCX157 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 Low Enable and Disable Times for Logic Propagation Delay. Pulse Width and trec Waveforms Setup Time, Hold Time and Recovery Time for Logic 3-STATE Output High Enable and Disable Times for Logic trise and tfall 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 74LCX157 Schematic Diagram Generic for LCX Family www.fairchildsemi.com 6 74LCX157 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 74LCX157 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 74LCX157 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued)