54AC/74AC138 # 54ACT/74ACT138 1-of-8 Decoder/Demultiplexer General Description Features The 'AC/'ACT138 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 'AC/'ACT138 devices or a 1-of-32 decoder using four 'AC/'ACT138 devices and one inverter. Y Y Y Y Y Y Y Logic Symbols ICC reduced by 50% Demultiplexing capability Multiple input enable for easy expansion Active LOW mutually exclusive outputs Outputs source/sink 24 mA 'ACT138 has TTL-compatible inputs Standard Military Drawing (SMD) 'AC138: 5962-87622 'ACT138: 5962-87554 Connection Diagrams Pin Assignment for DIP, Flatpak and SOIC Pin Assignment for LCC TL/F/9925-1 IEEE/IEC TL/F/9925 - 2 TL/F/9925 - 3 TL/F/9925-7 Pin Names A0 - A2 E1 - E2 E3 O0 - O7 Description Address Inputs Enable Inputs Enable Input Outputs FACTTM is a trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/9925 RRD-B30M75/Printed in U. S. A. 54AC/74AC138 # 54ACT/74ACT138 1-of-8 Decoder/Demultiplexer March 1993 Functional Description decoder with just four 'AC/'ACT138 devices and one inverter (see Figure 1 ). The 'AC/'ACT138 can be used as an 8output 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 activeLOW state. The 'AC/'ACT138 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 'AC/'ACT138 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. This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) 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/9925 - 4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 2 TL/F/9925 - 5 FIGURE 1. Expansion to 1-of-32 Decoding 3 Absolute Maximum Rating (Note 1) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage (VCC) DC Input Diode Current (IIK) VI e b0.5V VI e VCC a 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO e b0.5V VO e VCC a 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP PDIP Supply Voltage (VCC) 'AC 'ACT Input Voltage (VI) b 0.5V to a 7.0V b 20 mA a 20 mA 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC Output Voltage (VO) Operating Temperature (TA) 74AC/ACT 54AC/ACT b 0.5V to VCC a 0.5V b 20 mA a 20 mA b 40 C to a 85 C b 55 C to a 125 C Minimum Input Edge Rate (DV/Dt) 'AC Devices VIN from 30% to 70% of VCC VCC @ 3.3V, 4.5V, 5.5V Minimum Input Edge Rate (DV/Dt) 'ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V b 0.5V to VCC a 0.5V g 50 mA g 50 mA b 65 C to a 150 C 125 mV/ns 125 mV/ns 175 C 140 C Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. National does not recommend operation of FACT TM circuits outside databook specifications. DC Characteristics for 'AC Family Devices Symbol Parameter VCC (V) 74AC 54AC 74AC TA e a 25 C TA e b 55 C to a 125 C TA e b 40 C to a 85 C Typ VIH VIL VOH IIN Conditions Guaranteed Limits Minimum High Level Input Voltage 3.0 4.5 5.5 1.5 2.25 2.75 2.1 3.15 3.85 2.1 3.15 3.85 2.1 3.15 3.85 V VOUT e 0.1V or VCC b 0.1V Maximum Low Level Input Voltage 3.0 4.5 5.5 1.5 2.25 2.75 0.9 1.35 1.65 0.9 1.35 1.65 0.9 1.35 1.65 V VOUT e 0.1V or VCC b 0.1V Minimum High Level Output Voltage 3.0 4.5 5.5 2.99 4.49 5.49 2.9 4.4 5.4 2.9 4.4 5.4 2.9 4.4 5.4 V 2.56 3.86 4.86 2.4 3.7 4.7 2.46 3.76 4.76 V 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 V 3.0 4.5 5.5 0.36 0.36 0.36 0.50 0.50 0.50 0.44 0.44 0.44 V 5.5 g 0.1 g 1.0 g 1.0 mA 3.0 4.5 5.5 VOL Units Maximum Low Level Output Voltage Maximum Input Leakage Current 3.0 4.5 5.5 0.002 0.001 0.001 *All outputs loaded; thresholds on input associated with output under test. 4 IOUT e b50 mA *VIN e VIL or VIH b 12 mA b 24 mA IOH b 24 mA IOUT e 50 mA *VIN e VIL or VIH 12 mA IOL 24 mA 24 mA VI e VCC, GND DC Characteristics for 'AC Family Devices (Continued) Symbol Parameter VCC (V) 74AC 54AC 74AC TA e a 25 C TA e b 55 C to a 125 C TA e b 40 C to a 85 C Typ Minimum Dynamic Output Current IOLD IOHD ICC Maximum Quiescent Supply Current Units Conditions VOLD e 1.65V Max Guaranteed Limits 5.5 50 75 mA 5.5 b 50 b 75 mA VOHD e 3.85V Min mA VIN e VCC or GND 5.5 4.0 80.0 40.0 Maximum test duration 2.0 ms, one output loaded at a time. Note: IIN and ICC @ ICC for 54AC 3.0V are guaranteed to be less than or equal to the respective limit @ 25 C is identical to 74AC @ @ 5.5V VCC. 25 C. DC Characteristics for 'ACT Family Devices 74ACT 54ACT 74ACT TA e a 25 C TA e b 55 C to a 125 C TA e b 40 C to a 85 C Parameter VCC (V) VIH Minimum High Level Input Voltage 4.5 5.5 1.5 1.5 2.0 2.0 2.0 2.0 2.0 2.0 V VOUT e 0.1V or VCC b 0.1V VIL Maximum Low Level Input Voltage 4.5 5.5 1.5 1.5 0.8 0.8 0.8 0.8 0.8 0.8 V VOUT e 0.1V or VCC b 0.1V VOH Minimum High Level Output Voltage 4.5 5.5 4.49 5.49 4.4 5.4 4.4 5.4 4.4 5.4 V 3.86 4.86 3.70 4.70 3.76 4.76 V 0.1 0.1 0.1 0.1 0.1 0.1 V 4.5 5.5 0.36 0.36 0.50 0.50 0.44 0.44 V g 0.1 g 1.0 g 1.0 mA VI e VCC, GND 1.6 1.5 mA VI e VCC b 2.1V Symbol Typ 4.5 5.5 VOL Maximum Low Level Output Voltage 4.5 5.5 IIN Maximum Input Leakage Current 5.5 ICCT Maximum ICC/Input 5.5 IOLD Minimum Dynamic Output Current IOHD ICC Maximum Quiescent Supply Current 0.001 0.001 0.6 IOUT e b50 mA *VIN e VIL or VIH b 24 mA IOH b 24 mA IOUT e 50 mA *VIN e VIL or VIH 24 mA IOL 24 mA 5.5 50 75 mA VOLD e 1.65V Max 5.5 b 50 b 75 mA VOHD e 3.85V Min 80.0 40.0 mA VIN e VCC or GND 5.5 4.0 Maximum test duration 2.0 ms, one output loaded at a time. @ Conditions Guaranteed Limits *All outputs loaded; thresholds on input associated with output under test. Note: ICC for 54ACT Units 25 C is identical to 74ACT @ 25 C. 5 AC Electrical Characteristics 74AC 54AC 74AC TA e a 25 C CL e 50 pF TA e b55 C to a 125 C CL e 50 pF TA e b40 C to a 85 C CL e 50 pF Parameter VCC* (V) Min Typ Max Min Max Min Max tPLH Propagation Delay An to On 3.3 5.0 1.5 1.5 8.5 6.5 13.0 9.5 1.0 1.5 16.0 12.0 1.5 1.5 15.0 10.5 ns tPHL Propagation Delay An to On 3.3 5.0 1.5 1.5 8.0 6.0 12.5 9.0 1.0 1.5 15.0 11.5 1.5 1.5 14.0 10.5 ns tPLH Propagation Delay E1 or E2 to On 3.3 5.0 1.5 1.5 11.0 8.0 15.0 11.0 1.0 1.5 16.5 13.0 1.5 1.5 16.0 12.0 ns tPHL Propagation Delay E1 or E2 to On 3.3 5.0 1.5 1.5 9.5 7.0 13.5 9.5 1.0 1.5 15.5 12.0 1.5 1.5 15.0 10.5 ns tPLH Propagation Delay E3 to On 3.3 5.0 1.5 1.5 11.0 8.0 15.5 11.0 1.0 1.5 17.0 13.5 1.5 1.5 16.5 12.5 ns tPHL Propagation Delay E3 to On 3.3 5.0 1.5 1.5 8.5 6.0 13.0 8.0 1.0 1.5 15.0 11.0 1.5 1.0 14.0 9.5 ns Symbol Units *Voltage Range 3.3 is 3.3V g 0.3V Voltage Range 5.0 is 5.0V g 0.5V AC Electrical Characteristics Symbol VCC* (V) Parameter 74ACT 54ACT 74ACT TA e a 25 C CL e 50 pF TA e b55 C to a 125 C CL e 50 pF TA e b40 C to a 85 C CL e 50 pF Units Min Typ Max Min Max Min Max 10.5 1.5 12.5 1.5 11.5 ns 1.5 12.5 1.5 11.5 ns tPLH Propagation Delay An to On 5.0 1.5 7.0 tPHL Propagation Delay An to On 5.0 1.5 6.5 tPLH Propagation Delay E1 or E2 to On 5.0 2.5 8.0 11.5 1.5 13.5 2.0 12.5 ns tPHL Propagation Delay E1 or E2 to On 5.0 2.0 7.5 11.5 1.5 12.5 2.0 12.5 ns tPLH Propagation Delay E3 to On 5.0 2.5 8.0 12.0 1.5 14.0 2.0 13.0 ns tPHL Propagation Delay E3 to On 5.0 2.0 6.5 10.5 1.5 12.0 1.5 11.5 ns 10.5 *Voltage Range 5.0 is 5.0V g 0.5V Capacitance Symbol Parameter Typ Units Conditions CIN Input Capacitance 4.5 pF VCC e OPEN CPD Power Dissipation Capacitance 60.0 pF VCC e 5.0V 6 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: 74ACT 138 P Temperature Range Family 74AC e Commercial 54AC e Military 74ACT e Commercial TTL-Compatible 54ACT e Military TTL-Compatible C QR Special Variations X e Devices shipped in 13x reels QR e Commercial grade device with burn-in QB e Military grade device with environmental and burn-in processing shipped in tubes Device Type Package Code P e Plastic DIP D e Ceramic DIP F e Flatpak L e Leadless Ceramic Chip Carrier (LCC) S e Small Outline (SOIC) Temperature Range C e Commercial (b40 C to a 85 C) M e Military (b55 C to a 125 C) 7 Physical Dimensions inches (millimeters) 20 Terminal Ceramic Leadless Chip Carrier (L) NS Package Number E20A 16 Lead Ceramic Dual-In-Line Package (D) NS Package Number J16A 8 Physical Dimensions inches (millimeters) (Continued) 16 Lead Small Outline Integrated Circuit (S) NS Package Number M16A 16 Lead Plastic Dual-In-Line Package (P) NS Package Number N16E 9 54AC/74AC138 # 54ACT/74ACT138 1-of-8 Decoder/Demultiplexer Physical Dimensions inches (millimeters) (Continued) 16 Lead Ceramic Flatpak (F) NS Package Number W16A 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. As used herein: 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 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. National Semiconductor Corporation 2900 Semiconductor Drive P.O. Box 58090 Santa Clara, CA 95052-8090 Tel: 1(800) 272-9959 TWX: (910) 339-9240 National Semiconductor GmbH Livry-Gargan-Str. 10 D-82256 F4urstenfeldbruck Germany Tel: (81-41) 35-0 Telex: 527649 Fax: (81-41) 35-1 National Semiconductor Japan Ltd. Sumitomo Chemical Engineering Center Bldg. 7F 1-7-1, Nakase, Mihama-Ku Chiba-City, Ciba Prefecture 261 Tel: (043) 299-2300 Fax: (043) 299-2500 2. A critical component is 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. National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductores Do Brazil Ltda. Rue Deputado Lacorda Franco 120-3A Sao Paulo-SP Brazil 05418-000 Tel: (55-11) 212-5066 Telex: 391-1131931 NSBR BR Fax: (55-11) 212-1181 National Semiconductor (Australia) Pty, Ltd. Building 16 Business Park Drive Monash Business Park Nottinghill, Melbourne Victoria 3168 Australia Tel: (3) 558-9999 Fax: (3) 558-9998 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.