54LS257A/DM54LS257B/DM74LS257B, 54LS258A/DM54LS258B/DM74LS258B TRI-STATEE Quad 2-Data Selectors/Multiplexers General Description Features These Schottky-clamped high-performance multiplexers feature TRI-STATE outputs that can interface directly with data lines of bus-organized systems. With all but one of the common outputs disabled (at a high impedance state), the low impedance of the single enabled output will drive the bus line to a high or low logic level. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output enable circuitry is designed such that the output disable times are shorter than the output enable times. This TRI-STATE output feature means that n-bit (paralleled) data selectors with up to 258 sources can be implemented for data buses. It also permits the use of standard TTL registers for data retention throughout the system. Y Y Y Y Y Y TRI-STATE versions LS157 and LS158 with same pinouts Schottky-clamped for significant improvement in A-C performance Provides bus interface from multiple sources in highperformance systems Average propagation delay from data input 12 ns Typical power dissipation LS257B 50 mW LS258B 35 mW Alternate military/aerospace devices (54LS257A/ 54LS258A) are available. Contact a National Semiconductor Sales Office/Distributor for specifications. Connection Diagrams Dual-In-Line Package Dual-In-Line Package TL/F/6417 - 2 TL/F/6417 - 1 Order Number 54LS258ADMQB, 54LS258AFMQB, 54LS258ALMQB, DM54LS258BJ, DM54LS258BW, DM74LS258BM or DM74LS258BN See NS Package Number E20A, J16A, M16A, N16E or W16A Order Number 54LS257ADMQB, 54LS257AFMQB, 54LS257ALMQB, DM54LS257BJ, DM54LS257BW, DM74LS257BM or DM74LS257BN See NS Package Number E20A, J16A, M16A, N16E or W16A Function Table Inputs Output Y Output Control Select A B LS257 LS258 H L L L L X L L H H X L H X X X X X L H Z L H L H Z H L H L H e High Level, L e Low Level, X e Don't Care, Z e High Impedance (off) TRI-STATEE is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/6417 RRD-B30M105/Printed in U. S. A. 54LS257A/DM54LS257B/DM74LS257B, 54LS258A/DM54LS258B/DM74LS258B TRI-STATE Quad 2-Data Selectors/Multiplexers June 1989 Absolute Maximum Ratings (Note) Note: 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. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55 C to a 125 C DM54LS and 54LS DM74LS 0 C to a 70 C Storage Temperature Range b 65 C to a 150 C Recommended Operating Conditions Symbol DM54LS257B Parameter DM74LS257B Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage 0.7 0.8 V IOH High Level Output Current b1 b 2.6 mA IOL Low Level Output Current 24 mA TA Free Air Operating Temperature 70 C 2 2 V 12 b 55 125 V 0 'LS257B Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Min Typ (Note 1) DM54 2.4 3.4 DM74 2.4 3.1 Conditions Max Units b 1.5 V VI Input Clamp Voltage VOH High Level Output Voltage VCC e Min, II e b18 mA VCC e Min, IOH e Max VIL e Max, VIH e Min Low Level Output Voltage VCC e Min, IOL e Max VIL e Max, VIH e Min DM54 0.25 DM74 0.35 0.5 IOL e 12 mA, VCC e Min DM74 0.25 0.4 Input Current @ Max Input Voltage VCC e Max, VI e 7V Select 0.2 Other 0.1 High Level Input Current VCC e Max, VI e 2.7V Select 40 Other 20 Low Level Input Current VCC e Max, VI e 0.4V Select b 0.8 Other b 0.4 Off-State Output Current with High Level Output Voltage Applied VCC e Max, VO e 2.7V VIH e Min, VIL e Max 20 mA Off-State Output Current with Low Level Output Voltage Applied VCC e Max, VO e 0.4V VIH e Min, VIL e Max b 20 mA Short Circuit Output Current VCC e Max (Note 2) ICCH Supply Current with Outputs High VCC e Max (Note 3) 5.9 10 mA ICCL Supply Current with Outputs Low VCC e Max (Note 3) 9.2 16 mA ICCZ Supply Current with Outputs Disabled VCC e Max (Note 3) 12 19 mA VOL II IIH IIL IOZH IOZL IOS 0.4 DM54 b 20 b 100 DM74 b 20 b 100 Note 1: All typicals are at VCC e 5V, TA e 25 C. Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 3: ICC is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions. 2 V V mA mA mA mA 'LS257B Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) Symbol RL e 667X From (Input) To (Output) Parameter CL e 45 pF Min CL e 150 pF Max Min Units Max tPLH Propagation Delay Time Low to High Level Output Data to Output 18 27 ns tPHL Propagation Delay Time High to Low Level Output Data to Output 18 27 ns tPLH Propagation Delay Time Low to High Level Output Select to Output 28 35 ns tPHL Propagation Delay Time High to Low Level Output Select to Output 35 42 ns tPZH Output Enable Time to High Level Output Output Control to Y 15 27 ns tPZL Output Enable Time to Low Level Output Output Control to Y 28 38 ns tPHZ Output Disable Time from High Level Output (Note 1) Output Control to Y 26 ns tPLZ Output Disable Time from Low Level Output (Note 1) Output Control to Y 25 ns Note 1: CL e 5 pF. Recommended Operating Conditions Symbol DM54LS258B Parameter DM74LS258B Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage 0.7 0.8 V IOH High Level Output Current b1 b 2.6 mA IOL Low Level Output Current 12 24 mA 70 C Max Units b 1.5 V TA 2 Free Air Operating Temperature 2 b 55 125 V V 0 'LS258B Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL II IIH Parameter Conditions Min Typ (Note 1) Input Clamp Voltage VCC e Min, II e b18 mA High Level Output Voltage VCC e Min, IOH e Max VIL e Max, VIH e Min DM54 2.4 3.4 DM74 2.4 3.1 Low Level Output Voltage VCC e Min, IOL e Max VIL e Max, VIH e Min DM54 0.25 0.4 DM74 0.35 0.5 IOL e 12 mA, VCC e Min DM74 0.25 0.4 Input Current @ Max Input Voltage VCC e Max, VI e 7V Select 0.2 Other 0.1 High Level Input Current VCC e Max, VI e 2.7V Select 40 Other 20 3 V V mA mA 'LS258B Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) (Continued) Symbol IIL Parameter Conditions Min Typ (Note 1) Max Low Level Input Current VCC e Max, VI e 0.4V Off-State Output Current with High Level Output Voltage Applied VCC e Max, VO e 2.7V VIH e Min, VIL e Max 20 mA Off-State Output Current with Low Level Output Voltage Applied VCC e Max, VO e 0.4V VIH e Min, VIL e Max b 20 mA Short Circuit Output Current VCC e Max (Note 2) ICCH Supply Current with Outputs High VCC e Max (Note 3) 4.1 7 mA ICCL Supply Current with Outputs Low VCC e Max (Note 3) 9 14 mA ICCZ Supply Current with Outputs Disabled VCC e Max (Note 3) 12 19 mA IOZH IOZL IOS Select b 0.8 Other b 0.4 Units DM54 b 20 b 100 DM74 b 20 b 100 mA mA Note 1: All typicals are at VCC e 5V, TA e 25 C. Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 3: ICC is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions. 'LS258B Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter RL e 667X From (Input) To (Output) CL e 45 pF Min Max CL e 150 pF Min Units Max tPLH Propagation Delay Time Low to High Level Output Data to Output 18 27 ns tPHL Propagation Delay Time High to Low Level Output Data to Output 18 27 ns tPLH Propagation Delay Time Low to High Level Output Select to Output 28 35 ns tPHL Propagation Delay Time High to Low Level Output Select to Output 35 42 ns tPZH Output Enable Time to High Level Output Output Control to Y 15 27 ns tPZL Output Enable Time to Low Level Output Output Control to Y 28 38 ns tPHZ Output Disable Time from High Level Output (Note 4) Output Control to Y 26 ns tPLZ Output Disable Time from Low Level Output (Note 4) Output Control to Y 25 ns Note 4: CL e 5 pF. 4 Logic Diagrams LS257B TL/F/6417 - 3 LS258B TL/F/6417 - 4 5 Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS257ALMQB or 54LS258ALMQB NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS257ADMQB, 54LS258ADMQB, DM54LS257BJ or DM54LS258BJ NS Package Number J16A 6 Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS257BM or DM74LS258BM NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS257BN or DM74LS258BN NS Package Number N16E 7 54LS257A/DM54LS257B/DM74LS257B, 54LS258A/DM54LS258B/DM74LS258B TRI-STATE Quad 2-Data Selectors/Multiplexers Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS257AFMQB or 54LS258AFMQB 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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