74LS257

DM74LS257B FAIRCHILD | Alldatasheet

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I 3-STATE versions LS157 and LS158 with same pinouts I Schottky-clamped for significant improvement in A-C performance I Provides bus interface from multiple sources in high-performance systems I Average propagation delay from data input 12 ns I Typical power dissipation: 50 mW Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table H = HIGH Level X = Don’t Care L = LOW Level Z = High Impedance (off) Logic Diagram Order Number Package Number Package Description DM74LS257BM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS257BN N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Inputs Output Y Output Select A B LS257Control HX X X Z LL L X L LL H X H LH X L L LH X H H

www.fairchildsemi.com 2 DM74LS257B Absolute Maximum Ratings(Note 1) Note 1: 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 tables are not guaranteed at the absolute maximum ratings. The Recommended Operating Conditions table will define the conditions for actual device operation. Recommended Operating Conditions Note 2: All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 4: ICC is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°CSymbol Parameter Min Nom Max Units VCC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −2.6 mA IOL LOW Level Output Current 24 mA TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 2) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V VOH HIGH Level Output Voltage V IL = Max, VIH = Min 2.4 3.1 V VOL LOW Level Output V IL = Max, VIH = Min 0.35 0.5 V Voltage I OL = 12 mA, VCC = Min 0.25 0.4 II Input Current @ Max V CC = Max, Select 0.2 mA Input Voltage V I = 7V Other 0.1 IIH HIGH Level Input V CC = Max, Select 40 µA Current V I = 2.7V Other 20 IIL LOW Level Input V CC = Max, Select −0.8 mA Current V I = 0.4V Other −0.4 IOZH OFF-State Output Current with V CC = Max, VO = 2.7V 20 µA HIGH Level Output Voltage Applied VIH = Min, VIL = Max IOZL OFF-State Output Current with V CC = Max, VO = 0.4V −20 µA LOW Level Output Voltage Applied VIH = Min, VIL = Max IOS Short Circuit Output Current V CC = Max (Note 3) −20 −100 mA ICCH Supply Current with Outputs HIGH VCC = Max (Note 4) 5.9 10 mA ICCL Supply Current with Outputs LOW VCC = Max (Note 4) 9.2 16 mA ICCZ Supply Current with Outputs Disabled VCC = Max (Note 4) 12 19 mA

3 www.fairchildsemi.com DM74LS257B Switching Characteristics VCC = 5V and TA = 25°C Note 5: C L = 5 pF Symbol Parameter RL = 667Ω UnitsFrom (Input) C L = 45 pF C L = 150 pF To (Output) Min Max Min Max tPLH Propagation Delay Time Data to Output 18 27 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Data to Output 18 27 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Output 28 35 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Output 35 42 ns HIGH-to-LOW Level Output tPZH Output Enable Time Output Control to Y 15 27 ns to HIGH Level Output tPZL Output Enable Time Output Control to Y 28 38 ns to LOW Level Output tPHZ Output Disable Time from Output Control to Y 28 ns HIGH Level Output (Note 5) tPLZ Output Disable Time from Output Control to Y 25 ns LOW Level Output (Note 5)

www.fairchildsemi.com 4 DM74LS257B Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 5 www.fairchildsemi.com DM74LS257B 3-STATE Quad 2-Data Selectors/Multiplexers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD ’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 FAIRCHILD 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 (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com