54F/74F251A 8-Input Multiplexer with TRI-STATEÉ Outputs General Description Features The ’F251A is a high-speed 8-input digital multiplexer. It provides, in one package, the ability to select one bit of data from up to eight sources. It can be used as a universal function generator to generate any logic function of four variables. Both assertion and negation outputs are provided. Y Commercial Y Y Multifunctional capability On-chip select logic decoding Inverting and non-inverting TRI-STATE outputs Package Number Military Package Description N16E 16-Lead (0.300× Wide) Molded Dual-In-Line J16A 16-Lead Ceramic Dual-In-Line 74F251ASC (Note 1) M16A 16-Lead (0.150× Wide) Molded Small Outline, JEDEC 74F251ASJ (Note 1) M16D 16-Lead (0.300× Wide) Molded Small Outline, EIAJ 54F251AFM (Note 2) W16A 16-Lead Cerpack 54F251ALL (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C 74F251APC 54F251ADM (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/9504–3 IEEE/IEC TL/F/9504 – 1 TL/F/9504 – 2 TL/F/9504–5 TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/9504 RRD-B30M75/Printed in U. S. A. 54F/74F251A 8-Input Multiplexer with TRI-STATE Outputs November 1994 Unit Loading/Fan Out 54F/74F Pin Names S0 – S2 OE I0 – I7 Z Z Description U.L. HIGH/LOW Input IIH/IIL Output IOH/IOL Select Inputs TRI-STATE Output Enable Input (Active LOW) Multiplexer Inputs TRI-STATE Multiplexer Output Complementary TRI-STATE Multiplexer Output 1.0/1.0 1.0/1.0 1.0/1.0 150/40 (33.3) 150/40 (33.3) 20 mA/b0.6 mA 20 mA/b0.6 mA 20 mA/b0.6 mA b 3 mA/24 mA (20 mA) b 3 mA/24 mA (20 mA) Functional Description Truth Table This device is a logical implementation of a single-pole, 8position switch with the switch position controlled by the state of three Select inputs, S0, S1, S2. Both assertion and negation outputs are provided. The Output Enable input (OE) is active LOW. When it is activated, the logic function provided at the output is: Z e OE # (I0 # S0 # S1 # S2 a I1 # S0 # S1 # S2 a I2 # S0 # S1 # S2 a I3 # S0 # S1 # S2 a I4 # S0 # S1 # S2 a I5 # S0 # S1 # S2 a I6 # S0 # S1 # S2 a I7 # S0 # S1 # S2) When the Output Enable is HIGH, both outputs are in the high impedance (High Z) state. This feature allows multiplexer expansion by tying the outputs of up to 128 devices together. When the outputs of the TRI-STATE devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. The Output Enable signals should be designed to ensure there is no overlap in the active LOW portion of the enable voltages. Inputs Outputs OE S2 S1 S0 Z Z H L L L X L L L X L L H X L H L Z I0 I1 I2 Z I0 I1 I2 L L L L L L H H H H H L L H H H L H L H I3 I4 I5 I6 I7 I3 I4 I5 I6 I7 H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Z e High Impedance Logic Diagram TL/F/9504 – 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 Current Applied to Output in LOW State (Max) Absolute Maximum Ratings (Note 1) twice the rated IOL (mA) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. 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. Storage Temperature b 65§ C to a 150§ C Note 2: Either voltage limit or current limit is sufficient to protect inputs. Ambient Temperature under Bias Junction Temperature under Bias Plastic b 55§ C to a 125§ C Recommended Operating Conditions b 55§ C to a 175§ C b 55§ C to a 150§ C VCC Pin Potential to Ground Pin Free Air Ambient Temperature Military Commercial b 0.5V to a 7.0V b 0.5V to a 7.0V Input Voltage (Note 2) Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC e 0V) Standard Output TRI-STATE Output b 55§ C to a 125§ C 0§ C to a 70§ C Supply Voltage Military Commercial b 30 mA to a 5.0 mA a 4.5V to a 5.5V a 4.5V to a 5.5V b 0.5V to VCC b 0.5V to a 5.5V 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 Typ Units 2.0 54F 10% VCC 54F 10% VCC 74F 10% VCC 74F 10% VCC 74F 5% VCC 74F 5% VCC VCC Conditions Max V 0.8 V b 1.2 V 2.5 2.4 2.5 2.4 2.7 2.7 Recognized as a HIGH Signal Recognized as a LOW Signal Min IIN e b18 mA V Min IOH IOH IOH IOH IOH IOH IOL e 20 mA IOL e 24 mA e e e e e e b 1 mA b 3 mA b 1 mA b 3 mA b 1 mA b 3 mA VOL Output LOW Voltage 54F 10% VCC 74F 10% VCC 0.5 0.5 V Min IIH Input HIGH Current 54F 74F 20.0 5.0 mA Max VIN e 2.7V IBVI 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 b 0.6 mA Max VIN e 0.5V IOZH Output Leakage Current 50 mA Max VOUT e 2.7V IOZL Output Leakage Current b 50 mA Max VOUT e 0.5V IOS Output Short-Circuit Current b 150 mA Max VOUT e 0V IZZ Bus Drainage Test 500 mA 0.0V VOUT e 5.25V ICCL Power Supply Current 15 22 mA Max VO e LOW ICCZ Power Supply Current 16 24 mA Max VO e HIGH Z 4.75 b 60 3 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 Min Typ Max Min Max Min Max tPLH tPHL Propagation Delay Sn to Z 3.5 3.2 6.0 5.0 9.0 7.5 3.5 3.2 11.5 8.0 3.5 3.2 9.5 7.5 ns tPLH tPHL Propagation Delay Sn to Z 4.5 4.0 7.5 6.0 10.5 8.5 3.5 3.0 14.0 10.5 4.5 4.0 12.5 9.0 ns tPLH tPHL Propagation Delay In to Z 3.0 1.5 5.0 2.5 6.5 4.0 2.5 1.5 8.0 6.0 3.0 1.5 7.0 5.0 ns tPLH tPHL Propagation Delay In to Z 3.5 3.5 5.0 5.5 7.0 7.0 2.5 3.5 9.0 9.0 2.5 3.5 8.0 7.5 ns tPZH tPZL Output Enable Time OE to Z 2.5 2.5 4.3 4.3 6.0 6.0 2.0 2.5 7.0 7.5 2.5 2.5 7.0 6.5 tPHZ tPLZ Output Disable Time OE to Z 2.5 1.5 4.0 3.0 5.5 4.5 2.5 1.5 6.0 5.0 2.5 1.5 6.0 4.5 tPZH tPZL Output Enable Time OE to Z 3.5 3.5 5.0 5.5 7.0 7.5 3.0 3.5 8.5 9.0 3.0 3.5 7.5 8.0 tPHZ tPLZ Output Disable Time OE to Z 2.0 1.5 3.8 3.0 5.5 4.5 2.0 1.5 5.5 5.5 2.0 1.5 5.5 4.5 4 ns ns 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 251A 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) Physical Dimensions inches (millimeters) 20-Lead Ceramic Leadless Chip Carrier (L) NS Package Number E20A 5 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 6 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 7 54F/74F251A 8-Input Multiplexer with TRI-STATE Outputs 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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