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| DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers May 2007 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Features Switching specifications at 50pF Switching specifications guaranteed over full tm General Description 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. 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. 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 Ordering Information Order Number DM74AS257M DM74AS257N DM74AS258M Package Number M16A N16E M16A Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide 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. (c)1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Connection Diagram Function Table Inputs OUTPUT Control Select H L L L L H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance (OFF) X L L H H Output Y A X L H X X B X X X L H AS257 AS258 Z L H L H Z H L H L Logic Diagrams DM74AS257 DM74AS258 (c)1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 2 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. Symbol VCC VI TA TSTG JA Supply Voltage Input Voltage Parameter Rating 7V 7V 5.5V 0C to +70C -65C to +150C 75.0C/W Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical Thermal Resistance, N Package 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 VCC VIH VIL IOH IOL TA Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature Min. 4.5 2 Nom. 5 Max. 5.5 0.8 -15 48 Units V V V mA mA C 0 70 (c)1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 3 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Electrical Characteristics Over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH VOL II IIH IIL IO(1) IOZH IOZL ICCH ICCL ICCZ Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current @ Max. Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Off-State Output Current, HIGH Level Voltage Applied Off-State Output Current, LOW Level Voltage Applied Supply Current DM74AS257 DM74AS258 Supply Current DM74AS257 DM74AS258 Supply Current DM74AS257 DM74AS258 Conditions VCC = 4.5V, II = -18 mA VCC = 4.5V, IOH = Max IOH = -2 mA, VCC = 4.5V to 5.5V VCC = 4.5V, IOL = Max VCC = 5.5V, VIH = 7V A, B, G Select VCC = 5.5V, VIH = 2.7V A, B, G Select VCC = 5.5V, VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V, VO = 2.7V VCC = 5.5V, VO = 0.4V VCC = 5.5V, Outputs Open Outputs HIGH Outputs LOW Outputs Disabled Select All Others Min. 2.4 VCC - 2 Typ. 3.2 0.35 Max. -1.2 Units V V 0.5 0.1 0.2 20 40 -1 -0.5 V mA A mA mA A A mA mA mA -30 -112 -50 -50 12.9 8.8 19 15.8 19.7 15.5 19.7 13.5 30.6 24.6 31.9 25.2 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. (c)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 DM74AS257 Switching Characteristics Over recommended operating free air temperature range. Symbol tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time, LOW-to-HIGH Level Output Propagation Delay Time, HIGH-to-LOW Level Output Propagation Delay Time, LOW-to-HIGH Level Output Propagation Delay Time, HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Enable Time to LOW Level Output Disable Time from HIGH Level Output Disable Time from LOW Level Conditions VCC = 4.5V to 5.5V, CL = 50 pF, RL = 500 From Data To Any Y Min 1 1 Max 5.5 6 11 10 7.5 9.5 6.5 7 Units ns ns ns ns ns ns ns ns Select Any Y 2 2 OUTPUT Control Any Y 2 2 OUTPUT Control Any Y 1.5 2 DM74AS258 Switching Characteristics Over recommended operating free air temperature range. Symbol tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time, LOW-to-HIGH Level Output Propagation Delay Time, HIGH-to-LOW Level Output Propagation Delay Time, LOW-to-HIGH Level Output Propagation Delay Time, HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Enable Time to LOW Level Output Disable Time, from HIGH Level Output Disable Time from LOW Level Conditions VCC = 4.5V to 5.5V, CL = 50pF, RL = 500 From Data To Any Y Min. 1 1 Max. 5 4 9.5 10 8 10 6 6.5 Units ns ns ns ns ns ns ns ns Select Any Y 2 2 OUTPUT Control Any Y 2 2 OUTPUT Control Any Y 1.5 2 (c)1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 5 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 (c)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 (c)1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 7 DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers TRADEMARKS 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(R) Build it NowTM CorePLUSTM CROSSVOLTTM CTLTM Current Transfer LogicTM EcoSPARK(R) FACT Quiet SeriesTM FACT(R) FAST(R) FastvCoreTM FPSTM FRFET(R) Global Power ResourceSM Green FPSTM Green FPSTM e-SeriesTM GTOTM i-LoTM IntelliMAXTM ISOPLANARTM MegaBuckTM MICROCOUPLERTM MicroPakTM Motion-SPMTM OPTOLOGIC(R) OPTOPLANAR(R) PDP-SPMTM Power220(R) Power247(R) POWEREDGE(R) Power-SPMTM PowerTrench(R) Programmable Active DroopTM QFET(R) QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM SMART STARTTM SPM(R) STEALTHTM SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 SyncFETTM The Power Franchise(R) TM TinyBoostTM TinyBuckTM TinyLogic(R) TINYOPTOTM TinyPowerTM TinyPWMTM TinyWireTM SerDesTM UHC(R) UniFETTM VCXTM 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. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. 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. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I28 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. Preliminary First Production No Identification Needed Full Production Obsolete Not In Production (c)1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 Rev. 1.2 www.fairchildsemi.com 8 |
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