54F/74F138 1-of-8 Decoder/Demultiplexer General Description Features The ’F138 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 ’F138 devices or a 1-of-32 decoder using four ’F138 devices and one inverter. Y Commercial Y Y Y Demultiplexing capability Multiple input enable for easy expansion Active LOW mutually exclusive outputs Guaranteed 4000V minimum ESD protection Package Number Military Package Description N16E 16-Lead (0.300× Wide) Molded Dual-In-Line J16A 16-Lead Ceramic Dual-In-Line 74F138SC (Note 1) M16A 16-Lead (0.150× Wide) Molded Small Outline, JEDEC 74F138SJ (Note 1) M16D 16-Lead (0.300× Wide) Molded Small Outline, EIAJ 54F138FM (Note 2) W16A 16-Lead Cerpack 54F138LM (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C 74F138PC 54F138DM (Note 2) Note 1: Devices also available in 13× reel. Use suffix e SCX and SJX. Note 2: Military grade device with environmental and burn-in processing. Use suffix e DMQB, FMQB and LMQB. Logic Symbols Connection Diagrams Pin Assignment for DIP, SOIC and Flatpak Pin Assignment for LCC TL/F/9478–3 IEEE/IEC TL/F/9478 – 1 TL/F/9478 – 2 TL/F/9478–6 TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/9478 RRD-B30M75/Printed in U. S. A. 54F/74F138 1-of-8 Decoder/Demultiplexer November 1994 Unit Loading/Fan Out 54F/74F Pin Names A0 – A2 E1, E2 E3 O0 – O 7 Description U.L. HIGH/LOW Input IIH/IIL Output IOH/IOL Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs (Active LOW) 1.0/1.0 1.0/1.0 1.0/1.0 50/33.3 20 mA/b0.6 mA 20 mA/b0.6 mA 20 mA/b0.6 mA b 1 mA/20 mA Functional Description of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four ’F138 devices and one inverter (See Figure 1 ). The ’F138 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 ’F138 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 ’F138 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 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 2 Logic Diagram TL/F/9478 – 4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 Absolute Maximum Ratings (Note 1) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Storage Temperature b 65§ C to a 150§ C Ambient Temperature under Bias Junction Temperature under Bias Plastic b 55§ C to a 125§ C Free Air Ambient Temperature Military Commercial b 55§ C to a 125§ C 0§ C to a 70§ C Supply Voltage Military Commercial b 55§ C to a 175§ C b 55§ C to a 150§ C a 4.5V to a 5.5V a 4.5V to a 5.5V VCC Pin Potential to Ground Pin b 0.5V to a 7.0V b 0.5V to a 7.0V Input Voltage (Note 2) b 30 mA to a 5.0 mA Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC e 0V) b 0.5V to VCC Standard Output b 0.5V to a 5.5V TRI-STATEÉ Output Current Applied to Output in LOW State (Max) twice the rated IOL (mA) ESD Last Passing Voltage (Min) 4000V Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied. Note 2: Either voltage limit or current limit is sufficient to protect inputs. DC Electrical Characteristics Symbol 54F/74F Parameter Min VIH Input HIGH Voltage VIL Input LOW Voltage VCD Input Clamp Diode Voltage VOH Output HIGH Voltage 54F 10% VCC 74F 10% VCC 74F 5% VCC VOL Output LOW Voltage 54F 10% VCC 74F 10% VCC IIH Input HIGH Current IBVI Typ Units VCC Conditions Max 2.0 V Recognized as a HIGH Signal 0.8 V b 1.2 V Min IIN e b18 mA V Min IOH e b1 mA IOH e b1 mA IOH e b1 mA 0.5 0.5 V Min IOL e 20 mA IOL e 20 mA 54F 74F 20.0 5.0 mA Max VIN e 2.7V Input HIGH Current Breakdown Test 54F 74F 100 7.0 mA Max VIN e 7.0V ICEX Output HIGH Leakage Current 54F 74F 250 50 mA Max VOUT e VCC VID Input Leakage Test 74F V 0.0 IID e 1.9 mA All Other Pins Grounded IOD Output Leakage Circuit Current 74F 3.75 mA 0.0 VIOD e 150 mV All Other Pins Grounded IIL Input LOW Current IOS Output Short-Circuit Current ICCH Power Supply Current ICCL Power Supply Current 2.5 2.5 2.7 4.75 Recognized as a LOW Signal b 0.6 mA Max VIN e 0.5V b 150 mA Max VOUT e 0V 13 20 mA Max VO e HIGH 13 20 mA Max VO e LOW b 60 4 AC Electrical Characteristics Symbol Parameter 74F 54F 74F TA e a 25§ C VCC e a 5.0V CL e 50 pF TA, VCC e Mil CL e 50 pF TA, VCC e Com CL e 50 pF Units Fig. No. Min Typ Max Min Max Min Max tPLH tPHL Propagation Delay An to On 3.5 4.0 5.6 6.1 7.5 8.0 3.0 4.0 12.0 9.5 3.5 4.0 8.5 9.0 ns F –3 tPLH tPHL Propagation Delay E1 or E2 to On 3.5 3.0 5.4 5.3 7.0 7.0 3.0 3.0 11.0 8.0 3.5 3.0 8.0 7.5 ns F –4 tPLH tPHL Propagation Delay E3 to On 4.0 3.5 6.2 5.6 8.0 7.5 3.5 3.5 12.5 8.5 4.0 3.5 9.0 8.5 ns F –4 TL/F/9478 – 5 FIGURE 1. Expansion to 1-of-32 Decoding 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: 74F 138 S Temperature Range Family 74F e Commercial 54F e Military C X Special Variations QB e Military grade device with environmental and burn-in processing X e Devices shipped in 13× reel Device Type Package Code P e Plastic DIP D e Ceramic DIP F e Flatpak L e Leadless Chip Carrier (LCC) S e Small Outline SOIC JEDEC SJ e Small Outline SOIC EIAJ Temperature Range C e Commercial (0§ C to a 70§ C) M e Military (b55§ C to a 125§ C) 5 6 Physical Dimensions inches (millimeters) 20-Lead Ceramic Leadless Chip Carrier (L) NS Package Number E20A 7 Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Dual-In-Line Package (D) NS Package Number J16A 16-Lead (0.150× Wide) Molded Small Outline Package, JEDEC (S) NS Package Number M16A 8 Physical Dimensions inches (millimeters) (Continued) 16-Lead (0.300× Wide) Molded Small Outline Package, EIAJ (SJ) NS Package Number M16D 16-Lead (0.300× Wide) Molded Dual-In-Line Package (P) NS Package Number N16E 9 54F/74F138 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. 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