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Part: 74LCX157M
Category:
Description: Low Voltage Quad 2-Input Multiplexer With 5V Tolerant Inputs
Company: Fairchild Semiconductor
Datasheet: Download 74LCX157M datasheet File size : 201 kB
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74LCX157 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs
May 1995 Revised February 2001
74LCX157 Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs
General Description
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. The 74LCX157 is fabricated with advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation.
Features
s 5V tolerant inputs s 2.3V3.6V VCC specifications provided s 5.8 ns tPD max (VCC = 3.3V), 10 µA ICC max s Power down high impedance inputs and outputs s ±24 mA output drive (VCC = 3.0V) s Implements patented noise/EMI reduction circuitry s Latch-up performance exceeds 500 mA s ESD performance: Human body model > 2000V Machine model > 200V
Ordering Code:
Order Number 74LCX157M 74LCX157SJ 74LCX157MTC Package Number M16A M16D MTC16 Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 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 I0aI0d I1aI1d E S ZaZd Description Source 0 Data Inputs Source 1 Data Inputs Enable Input Select Input Outputs
© 2001 Fairchild Semiconductor Corporation
DS012465
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74LCX157
Functional Description
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: Za = E · (I1a · S + I0a · S) Zb = E · (I1b · S + I0b · S) 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.
Truth Table
Inputs E H L L L L S X H H L L I0 X X X L H I1 X L H X X Outputs Z L L H L H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
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.
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74LCX157
Absolute Maximum Ratings(Note 1)
Symbol VCC VI VO IIK IOK IO ICC IGND TSTG Parameter Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Source/Sink Current DC Supply Current per Supply Pin DC Ground Current per Ground Pin Storage Temperature Value Conditions Units V V Output in HIGH or LOW State (Note 2) VI VCC V mA mA mA mA mA
-0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 -5 0 -5 0 +5 0 ±5 0 ±100 ±100 -65 to +150
°C
Recommended Operating Conditions (Note 3)
Symbol VCC VI VO IOH/IOL Supply Voltage Input Voltage Output Voltage Output Current HIGH or LOW State VCC = 3.0V - 3.6V VCC = 2.7V - 3.0V VCC = 2.3V - 2.7V TA Free-Air Operating Temperature Input Edge Rate, VIN = 0.8V - 2.0V, VCC = 3.0V Parameter Operating Data Retention Min 2.0 1 .5 0 0 Max 3.6 3.6 5.5 VC C Units V V V mA
±2 4 ±1 2 ±8 -4 0
0 85 10
°C
ns/V
t/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 Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage IOH = -100 µA IOH = -8 mA IOH = -12 mA IOH = -18 mA IOH = -24 mA VOL LOW Level Output Voltage IOL = 100 µA IOH = 8 mA IOL = 12 mA IOL = 16 mA IOL = 24 mA II IOFF ICC ICC Input Leakage Current Power-Off Leakage Current Quiescent Supply Current Increase in ICC per Input 0 VI 5.5V VI or VO = 5.5V VI = V CC or GND 3.6V VI 5.5V VIH = VCC -0.6V Conditions VCC (V) 2.3 - 2.7 2.7 - 3.6 2.3 - 2.7 2.7 - 3.6 2.3 - 3.6 2.3 2.7 3.0 3.0 2.3 - 3.6 2.3 2.7 3.0 3.0 2.3 - 3.6 0 2.3 - 3.6 2.3 - 3.6 2.3 - 3.6 VCC - 0.2 1.8 2.2 2.4 2.2 0 .2 0.6 0 .4 0 .4 0.55 ±5.0 10 10 ±10 500 µA µA µA µA V V TA = -40°C to +85°C M in 1 .7 2 .0 0 .7 0 .8 Max V V Units
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74LCX157
AC Electrical Characteristics
TA = -40°C to +85°C, RL = 500 Symbol Parameter VCC = 3.3V ± 0.3V CL = 50 pF Min tPHL tPLH tPHL tPLH tPHL tPLH tOSHL tOSLH Propagation Delay SZn Propagation Delay EZn Propagation Delay InZn Output to Output Skew (Note 4) 1 .5 1 .5 1 .5 1 .5 1 .5 1 .5 Max 7.0 7 .0 7.0 7 .0 5.8 5 .8 1.0 1.0 VCC = 2.7V CL = 50 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 M ax 8.0 8 .0 8.0 8 .0 6.3 6 .3 VCC = 2.5V ± 0.2V CL = 30 pF Min 1 .5 1 .5 1 .5 1 .5 1 .5 1 .5 Max 8.4 8.4 8.4 8.4 7.0 7.0 ns ns ns ns Units
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 CL = 50 pF, VIH = 3.3V, VIL = 0V CL= 30 pF, VIH = 2.5V, VIL = 0V CL = 50 pF, VIH = 3.3V, VIL = 0V CL= 30 pF, VIH = 2.5V, VIL = 0V VCC (V) 3.3 2.5 3.3 2.5 TA = 25°C Typical 0 .8 0.6 -0.8 -0.6 V V Units
Capacitance
Symbol CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance Parameter Conditions VCC = Open, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC, f = 10 MHz Typical 7 8 25 Units pF pF pF
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74LCX157
AC LOADING and WAVEFORMS Generic for LCX Family
FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance) Test tPLH, tPHL tPZL, tPLZ tPZH, tPHZ Switch Open 6V at VCC = 3.3 ± 0.3V VCC x 2 at VCC = 2.5 ± 0.2V G ND
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 FIGURE 2. Waveforms (Input Characteristics; f =1MHz, tr = tf = 3ns) Symbol Vmi Vm o Vx Vy VC C 3.3V ± 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 2.7V 1.5V 1.5V VOL + 0.3V VOH - 0.3V
trise and tfall
2.5V ± 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V
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