74LCX138 Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs General Description Features The LCX138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three LCX138 devices or a 1-of-32 decoder using four LCX138 devices and one inverter. The 74LCX138 is fabricated with advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation. Y Y Y Y Y Y Y Y Y Y 5V tolerant inputs 6.0 ns tPD max, 10 mA ICCQ max Power down high impedance inputs and outputs Supports live insertion/withdrawal 2.0V - 3.6V VCC supply operation g 24 mA output drive Implements patented Quiet SeriesTM noise/EMI reduction circuitry Functionally compatible with 74 series 138 Latch-up performance exceeds 500 mA ESD performance: Human body model l 2000V Machine model l 200V Logic Symbols Connection Diagram Pin Assignment for SOIC and TSSOP IEEE/IEC TL/F/12417-1 TL/F/12417 - 3 TL/F/12417 - 2 Pin Names A0 - A2 E1 - E2 E3 O 0 - O7 Order Number See NS Package Number Description Address Inputs Enable Inputs Enable Input Outputs SOIC JEDEC SOIC EIAJ TSSOP 74LCX138M 74LCX138MX 74LCX138SJ 74LCX138SJX 74LCX138MTC 74LCX138MTCX M16A M16D MTC16 Quiet SeriesTM is a trademark of National Semiconductor Corporation. C1996 National Semiconductor Corporation TL/F/12417 RRD-B30M17/Printed in U. S. A. http://www.national.com 74LCX138 Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs November 1996 Functional Description The LCX138 can be used as an 8-output demultiplexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes. The Enable inputs which are not used must be permanently tied to their appropriate active-HIGH or active-LOW state. The LCX138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active-LOW outputs (O0 - O7). The LCX138 features three Enable inputs, two active-LOW (E1, E2) and one active-HIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. Truth Table Inputs Outputs E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7 H X X X H X X X L X X X X X X X X X H H H H H H H H H H H H H H H H H H H H H H H H L L L L L L L L H H H H L H L H L L H H L L L L L H H H H L H H H H L H H H H L H H H H H H H H H H H H H H H H L L L L L L L L H H H H L H L H L L H H H H H H H H H H H H H H H H H H H H H H L H H H H L H H H H L H H H H L H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Logic Diagram TL/F/12417 - 4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. http://www.national.com 2 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Symbol Parameter Value Conditions Units VCC Supply Voltage b 0.5 to a 7.0 VI DC Input Voltage b 0.5 to a 7.0 V VO DC Output Voltage IIK DC Input Diode Current b 50 VI k GND mA IOK DC Output Diode Current b 50 a 50 VO k GND VO l VCC mA IO DC Output Source/Sink Current ICC DC Supply Current per Supply Pin IGND DC Ground Current per Ground Pin TSTG Storage Temperature V b 0.5 to VCC a 0.5 Output in High or Low State (Note 2) V g 50 mA g 100 mA g 100 mA b 65 to a 150 C 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'' table 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. Recommended Operating Conditions Symbol Parameter VCC Supply Voltage Operating Data Retention VI Input Voltage VO Output Voltage HIGH or LOW State IOH/IOL Output Current VCC e 3.0V - 3.6V VCC e 2.7V TA Free-Air Operating Temperature Dt/DV Input Edge Rate, VIN e 0.8V-2.0V, VCC e 3.0V Min Max Units 2.0 1.5 3.6 3.6 V 0 5.5 V 0 VCC V g 24 g 12 mA b 40 85 C 0 10 ns/V DC Electrical Characteristics Symbol Parameter VCC (V) Conditions VIH HIGH Level Input Voltage 2.7 - 3.6 VIL LOW Level Input Voltage 2.7 - 3.6 VOH HIGH Level Output Voltage VOL LOW Level Output Voltage TA e b40 C to a 85 C Min Units Max 2.0 V 0.8 V IOH e b100 mA 2.7 - 3.6 VCC b 0.2 V IOH e b12 mA 2.7 2.2 V IOH e b18 mA 3.0 2.4 V IOH e b24 mA 3.0 2.2 V IOL e 100 mA 2.7 - 3.6 0.2 V IOL e 12 mA 2.7 0.4 V IOL e 16 mA 3.0 0.4 V IOL e 24 mA 3.0 0.55 V g 5.0 mA mA II Input Leakage Current 0 s VI s 5.5V 2.7 - 3.6 IOFF Power-Off Leakage Current 10 Quiescent Supply Current VI or VO e 5.5V VI e VCC or GND 0 ICC 2.7 - 3.6 10 mA 3.6V s VI, VO s 5.5V 2.7 - 3.6 g 10 mA VIH e VCC b0.6V 2.7 - 3.6 500 mA DICC Increase in ICC per Input 3 http://www.national.com AC Electrical Characteristics (Preliminary) TA e b40 C to a 85 C Symbol Parameter VCC e 3.3V g 0.3V Units VCC e 2.7V Min Max Min Max tPHL tPLH Propagation Delay An to Yn 1.5 1.5 6.0 6.0 1.5 1.5 7.0 7.0 ns tPHL tPLH Propagation Delay E3 to Yn 1.5 1.5 6.5 6.5 1.5 1.5 7.5 7.5 ns tPHL tPLH Propagation Delay E1 or E2 to Yn 1.5 1.5 6.0 6.0 1.5 1.5 7.0 7.0 ns tOSHL tOSLH Output to Output Skew (Note 3) 1.0 1.0 ns Note 3: 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 Parameter Conditions Quiet Output Dynamic Peak VOL CL e 50 pF, VIH e 3.3V, VIL e 0V Quiet Output Dynamic Valley VOL CL e 50 pF, VIH e 3.3V, VIL e 0V VCC (V) TA e 25 C Units Typical 3.3 0.8 V 3.3 b 0.8 V Capacitance Typical Units CIN Symbol Input Capacitance Parameter VCC e Open, VI e 0V or VCC 7 pF COUT Output Capacitance VCC e 3.3V, VI e 0V or VCC 8 pF CPD Power Dissipation Capacitance VCC e 3.3V, VI e 0V or VCC, F e 10 MHz 25 pF http://www.national.com Conditions 4 74LCX138 Ordering Information The device number is used to form part of a simplified purchasing code where the package type and temperature range are defined as follows: TL/F/12417 - 5 5 http://www.national.com http://www.national.com 6 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead (0.0150x Wide) Molded Small Outline Package, JEDEC Order Number 74LCX138M or 74LCX138MX NS Package Number M16A 16-Lead Small Outline Package EIAJ (SJ) Order Number 74LCX138SJ or 74LCX138SJX NS Package Number M16D 7 http://www.national.com 74LCX138 Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs Physical Dimensions All dimensions are in millimeters (Continued) 16-Lead Thin Shrink Small Outline Package (MTC) Order Number 74LCX138MTC or 74LCX138MTCX NS Package Number MTC16 LIFE SUPPORT POLICY NATIONAL'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 NATIONAL SEMICONDUCTOR CORPORATION. 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