74LS257

54LS257A NSC | Alldatasheet

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Y TRI-STATE versions LS157 and LS158 with same pin- outs Y Schottky-clamped for significant improvement in A-C performance Y Provides bus interface from multiple sources in high- performance systems Y Average propagation delay from data input 12 ns Y Typical power dissipation LS257B 50 mW LS258B 35 mW Y Alternate military/aerospace devices (54LS257A/ 54LS258A) are available. Contact a National Semicon- ductor Sales Office/Distributor for specifications. Connection Diagrams Dual-In-Line Package TL/F/6417–1 Order Number 54LS257ADMQB, 54LS257AFMQB, 54LS257ALMQB, DM54LS257BJ, DM54LS257BW, DM74LS257BM or DM74LS257BN See NS Package Number E20A, J16A, M16A, N16E or W16A Dual-In-Line Package TL/F/6417–2 Order Number 54LS258ADMQB, 54LS258AFMQB, 54LS258ALMQB, DM54LS258BJ, DM54LS258BW, DM74LS258BM or DM74LS258BN See NS Package Number E20A, J16A, M16A, N16E or W16A Function Table Inputs Output Y Output Select A B LS257 LS258Control HX X X Z Z LL L X L H LL H X H L LH X L L H LH X H H L H e High Level, L e Low Level, X e Don’t Care, Z e High Impedance (off) TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note) 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 DM54LS and 54LS b55§Ct o a125§C DM74LS 0 §Ct o a70§C Storage Temperature Range b65§Ct o a150§C Note: The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaran- teed. 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. Recommended Operating Conditions Symbol Parameter DM54LS257B DM74LS257B Units Min Nom Max Min Nom Max VCC Supply Voltage 4.5 5 5.5 4.75 5 5.25 V VIH High Level Input Voltage 2 2 V VIL Low Level Input Voltage 0.7 0.8 V IOH High Level Output Current b1 b2.6 mA IOL Low Level Output Current 12 24 mA TA Free Air Operating Temperature b55 125 0 70 §C ’LS257B Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units(Note 1) VI Input Clamp Voltage V CC e Min, I I eb 18 mA b1.5 V VOH High Level Output V CC e Min, I OH e Max DM54 2.4 3.4 VVoltage V IL e Max, V IH e Min DM74 2.4 3.1 VOL Low Level Output V CC e Min, I OL e Max DM54 0.25 0.4 Voltage V IL e Max, V IH e Min DM74 0.35 0.5 V IOL e 12 mA, V CC e Min DM74 0.25 0.4 II Input Current @ Max V CC e Max, Select 0.2 mAInput Voltage V I e 7V Other 0.1 IIH High Level Input V CC e Max, Select 40 mACurrent V I e 2.7V Other 20 IIL Low Level Input V CC e Max, Select b0.8 mACurrent V I e 0.4V Other b0.4 IOZH Off-State Output Current V CC e Max, V O e 2.7V with High Level Output V IH e Min, V IL e Max 20 mA Voltage Applied IOZL Off-State Output Current V CC e Max, V O e 0.4V with Low Level Output V IH e Min, V IL e Max b20 mA Voltage Applied IOS Short Circuit V CC e Max DM54 b20 b100 mAOutput Current (Note 2) DM74 b20 b100 ICCH Supply Current with V CC e Max (Note 3) 5.9 10 mAOutputs High ICCL Supply Current with V CC e Max (Note 3) 9.2 16 mAOutputs Low ICCZ Supply Current with V CC e Max (Note 3) 12 19 mAOutputs Disabled Note 1: All typicals are at V CC e 5V, T A 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.

’LS257B Switching Characteristics at V CC e 5V and T A e 25§C (See Section 1 for Test Waveforms and Output Load) From (Input) RL e 667X Symbol Parameter To (Output) CL e 45 pF C L e 150 pF Units Min Max Min Max tPLH Propagation Delay Time Data to 18 27 nsLow to High Level Output Output tPHL Propagation Delay Time Data to 18 27 nsHigh to Low Level Output Output tPLH Propagation Delay Time Select to 28 35 nsLow to High Level Output Output tPHL Propagation Delay Time Select to 35 42 nsHigh to Low Level Output Output tPZH Output Enable Time Output 15 27 nsto High Level Output Control to Y tPZL Output Enable Time Output 28 38 nsto Low Level Output Control to Y tPHZ Output Disable Time from Output 26 nsHigh Level Output (Note 1) Control to Y tPLZ Output Disable Time from Output 25 nsLow Level Output (Note 1) Control to Y Note 1: CL e 5 pF. Recommended Operating Conditions Symbol Parameter DM54LS258B DM74LS258B Units Min Nom Max Min Nom Max VCC Supply Voltage 4.5 5 5.5 4.75 5 5.25 V VIH High Level Input Voltage 2 2 V VIL Low Level Input Voltage 0.7 0.8 V IOH High Level Output Current b1 b2.6 mA IOL Low Level Output Current 12 24 mA TA Free Air Operating Temperature b55 125 0 70 §C ’LS258B Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions Min Typ Max Units(Note 1) VI Input Clamp Voltage V CC e Min, I I eb 18 mA b1.5 V VOH High Level Output V CC e Min, I OH e Max DM54 2.4 3.4 VVoltage V IL e Max, V IH e Min DM74 2.4 3.1 VOL Low Level Output V CC e Min, I OL e Max DM54 0.25 0.4 Voltage V IL e Max, V IH e Min DM74 0.35 0.5 V IOL e 12 mA, V CC e Min DM74 0.25 0.4 II Input Current @ Max V CC e Max, Select 0.2 mAInput Voltage V I e 7V Other 0.1 IIH High Level Input V CC e Max, Select 40 mACurrent V I e 2.7V Other 20

’LS258B Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) (Continued) Symbol Parameter Conditions Min Typ Max Units(Note 1) IIL Low Level Input V CC e Max, Select b0.8 mACurrent V I e 0.4V Other b0.4 IOZH Off-State Output Current V CC e Max, V O e 2.7V with High Level Output V IH e Min, V IL e Max 20 mA Voltage Applied IOZL Off-State Output Current V CC e Max, V O e 0.4V with Low Level Output V IH e Min, V IL e Max b20 mA Voltage Applied IOS Short Circuit V CC e Max DM54 b20 b100 mAOutput Current (Note 2) DM74 b20 b100 ICCH Supply Current with V CC e Max (Note 3) 4.1 7 mAOutputs High ICCL Supply Current with V CC e Max (Note 3) 91 4 m AOutputs Low ICCZ Supply Current with V CC e Max (Note 3) 12 19 mAOutputs Disabled Note 1: All typicals are at V CC e 5V, T A 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 V CC e 5V and T A e 25§C (See Section 1 for Test Waveforms and Output Load) From (Input) RL e 667X Symbol Parameter To (Output) CL e 45 pF C L e 150 pF Units Min Max Min Max tPLH Propagation Delay Time Data to 18 27 nsLow to High Level Output Output tPHL Propagation Delay Time Data to 18 27 nsHigh to Low Level Output Output tPLH Propagation Delay Time Select to 28 35 nsLow to High Level Output Output tPHL Propagation Delay Time Select to 35 42 nsHigh to Low Level Output Output tPZH Output Enable Time Output 15 27 nsto High Level Output Control to Y tPZL Output Enable Time Output 28 38 nsto Low Level Output Control to Y tPHZ Output Disable Time from Output 26 nsHigh Level Output (Note 4) Control to Y tPLZ Output Disable Time from Output 25 nsLow Level Output (Note 4) Control to Y Note 4: CL e 5 pF.

TL/F/6417–3 LS258B TL/F/6417–4

Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS257ALMQB or 54LS258ALMQB 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS257ADMQB, 54LS258ADMQB, DM54LS257BJ or DM54LS258BJ

Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS257BM or DM74LS258BM 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS257BN or DM74LS258BN

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 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 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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