DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Features General Description ■ Switching specifications at 50pF These data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four 3-STATE outputs that can interface directly with data lines of bus-organized systems. A 4-bit word selected from one of two sources is routed to the four outputs. The DM74AS257 presents true data whereas the DM74AS258 presents inverted data to minimize propagation delay time. ■ Switching specifications guaranteed over full temperature and VCC range ■ Advanced oxide-isolated, ion-implanted Schottky TTL process ■ Functionally and pin for pin compatible with Schottky, ■ ■ ■ ■ ■ ■ low power Schottky, and advanced low power Schottky TTL counterpart Improved AC performance over Schottky, low power Schottky, and advanced low power Schottky counterparts 3-STATE buffer-type output drive bus lines directly Expand any data input point Multiplex dual data buses General four functions of two variables (one variable is common) Source programmable counters tm This 3-STATE output feature means that n-bit (paralleled) data selectors with up to 300 sources can be implemented for data buses. It also permits the use of standard TTL registers for data retention throughout the system. Ordering Information Order Number Package Number Package Description DM74AS257M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow DM74AS257N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide DM74AS258M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number. ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers May 2007 Function Table Inputs OUTPUT Control Select Output Y A B X X H X L L L L L H L H X L H X AS257 AS258 Z Z X L H X H L L L H H H L H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance (OFF) Logic Diagrams DM74AS257 ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 DM74AS258 www.fairchildsemi.com 2 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Connection Diagram Symbol VCC VI Parameter Rating Supply Voltage 7V Input Voltage 7V Voltage Applied to Disabled Output TA TSTG θJA 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range –65°C to +150°C Typical Thermal Resistance, N Package 75.0°C/W Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter Min. Nom. Max. Units 4.5 5 5.5 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current –15 mA 48 mA 70 °C IOL LOW Level Output Current TA Free Air Operating Temperature ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 2 0 V www.fairchildsemi.com 3 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Symbol Parameter Conditions VIK Input Clamp Voltage VCC = 4.5V, II = –18 mA VOH HIGH Level Output Voltage VCC = 4.5V, IOH = Max IOH = –2 mA, VCC = 4.5V to 5.5V VOL LOW Level Output Voltage VCC = 4.5V, IOL = Max II Input Current @ Max. Input Voltage VCC = 5.5V, VIH = 7V HIGH Level Input Current VCC = 5.5V, VIH = 2.7V A, B, G IIH Min. Typ. 2.4 3.2 LOW Level Input Current VCC = 5.5V, VIL = 0.4V Output Drive Current VCC = 5.5V, VO = 2.25V IOZH Off-State Output Current, HIGH Level Voltage Applied IOZL ICCH 0.35 V 0.5 V 0.1 mA Select 0.2 20 µA 40 Select –1 mA –0.5 –30 mA VCC = 5.5V, VO = 2.7V –50 µA Off-State Output Current, LOW Level Voltage Applied VCC = 5.5V, VO = 0.4V –50 µA Supply Current DM74AS257 VCC = 5.5V, Outputs Open 12.9 19.7 mA 8.8 13.5 Outputs HIGH Supply Current DM74AS257 Outputs LOW DM74AS258 ICCZ V –112 DM74AS258 ICCL –1.2 A, B, G All Others IO(1) Units VCC – 2 Select IIL Max. Supply Current DM74AS257 Outputs Disabled DM74AS258 19 30.6 15.8 24.6 19.7 31.9 15.5 25.2 mA mA Note: 1. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 4 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Electrical Characteristics Over recommended operating free air temperature range. Symbol Parameter tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output tPZH Output Enable Time to HIGH Level tPZL Output Enable Time to LOW Level tPHZ Output Disable Time from HIGH Level tPLZ Output Disable Time from LOW Level Conditions From To Min Max Units VCC = 4.5V to 5.5V, CL = 50 pF, RL = 500Ω Data Any Y 1 5.5 ns 1 6 ns 2 11 ns 2 10 ns 2 7.5 ns 2 9.5 ns 1.5 6.5 ns 2 7 ns Select OUTPUT Control OUTPUT Control Any Y Any Y Any Y DM74AS258 Switching Characteristics Over recommended operating free air temperature range. Symbol Parameter tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output tPZH Output Enable Time to HIGH Level tPZL Output Enable Time to LOW Level tPHZ Output Disable Time, from HIGH Level tPLZ Output Disable Time from LOW Level ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 Conditions From To Min. Max. Units VCC = 4.5V to 5.5V, CL = 50pF, RL = 500Ω Data Any Y 1 5 ns 1 4 ns 2 9.5 ns 2 10 ns 2 8 ns 2 10 ns 1.5 6 ns 2 6.5 ns Select OUTPUT Control OUTPUT Control Any Y Any Y Any Y www.fairchildsemi.com 5 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers DM74AS257 Switching Characteristics DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Physical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M16A ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 6 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Physical Dimensions (Continued) Dimensions are in inches (millimeters) unless otherwise noted. Figure 2. 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N16E ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 7 The following are registered and unregistered trademarks and service marks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks ACEx® Build it Now™ CorePLUS™ CROSSVOLT™ CTL™ Current Transfer Logic™ EcoSPARK® FACT Quiet Series™ FACT® FAST® FastvCore™ FPS™ FRFET® Global Power ResourceSM Green FPS™ Green FPS™ e-Series™ GTO™ i-Lo™ IntelliMAX™ ISOPLANAR™ MegaBuck™ MICROCOUPLER™ MicroPak™ Motion-SPM™ OPTOLOGIC® OPTOPLANAR® PDP-SPM™ Power220® Power247® POWEREDGE® Power-SPM™ PowerTrench® Programmable Active Droop™ QFET® QS™ QT Optoelectronics™ Quiet Series™ RapidConfigure™ SMART START™ SPM® STEALTH™ SuperFET™ SuperSOT™-3 SuperSOT™-6 SuperSOT™-8 SyncFET™ The Power Franchise® ™ TinyBoost™ TinyBuck™ TinyLogic® TINYOPTO™ TinyPower™ TinyPWM™ TinyWire™ µSerDes™ UHC® UniFET™ VCX™ DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. 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 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 reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I28 ©1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 8 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers TRADEMARKS