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| DM74AS257 * DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers September 1986 Revised March 2000 DM74AS257 * DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers General Description These data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four 3STATE 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. Features s Switching specifications at 50 pF s Switching specifications guaranteed over full temperature and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process s Functionally and pin for pin compatible with Schottky, low power Schottky, and advanced low power Schottky TTL counterpart s Improved AC performance over Schottky, low power Schottky, and advanced low power Schottky counterparts s 3-STATE buffer-type output drive bus lines directly s Expand any data input point s Multiplex dual data buses s General four functions of two variables (one variable is common) s Source programmable counters Ordering Code: Order Number DM74AS257M DM74AS257N DM74AS258M DM74AS258N Package Number M16A N16E M16A N16E 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 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Connection Diagram Function Table INPUTS OUTPUT SELECT CONTROL 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 A B AS257 AS258 OUTPUT Y H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance (OFF) (c) 2000 Fairchild Semiconductor Corporation DS006107 www.fairchildsemi.com DM74AS257 * DM74AS258 Logic Diagrams DM74AS257 DM74AS258 www.fairchildsemi.com 2 DM74AS257 * DM74AS258 Absolute Maximum Ratings(Note 1) Supply Voltage, VCC Input Voltage Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package 75.0C/W 7V 7V 5.5V 0C to +70C -65C to +150C 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 Symbol VCC VIH VIL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4.5 2 0.8 -15 48 70 Nom 5 Max 5.5 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH VOL II Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current @ Max Input Voltage IIH IIL IO (Note 2) IOZH IOZL ICCH ICCL ICCZ 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 Supply Current Supply Current DM74AS257 DM74AS258 DM74AS257 DM74AS258 DM74AS257 DM74AS258 VCC = 5.5V Outputs Open Outputs Disabled Outputs LOW VCC = 5.5V, VO = 2.25V VCC = 5.5V VO = 2.7V VCC = 5.5V VO = 0.4V Outputs HIGH 12.9 8.8 19 15.8 19.7 15.5 -50 19.7 13.5 30.6 24.6 31.9 25.2 A mA mA mA mA mA mA VCC = 5.5V, VIL = 0.4V VCC = 5.5V, VIH = 2.7V 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 A, B, G Select Select All Others -30 2.4 VCC - 2 0.35 0.5 0.1 0.2 20 40 -1 -0.5 -112 -50 3.2 Min Typ Max -1.2 Units V V V V mA A mA mA A Note 2: The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. 3 www.fairchildsemi.com DM74AS257 * DM74AS258 DM74AS257 Switching Characteristics over recommended operating free air temperature range Symbol tPLH tPHL tPLH tPHL 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 tPZH tPZL Output Enable Time to HIGH Level Output Enable Time to LOW Level tPHZ tPLZ Output Disable Time, from HIGH Level Output Disable Time, from LOW Level OUTPUT Control Any Y OUTPUT Control Any Y Select Any Y From Data To Any Y Conditions VCC = 4.5V to 5.5V, CL = 50 pF, RL = 500 Min 1 1 2 2 Max 5.5 6 11 10 Units ns ns ns ns 2 2 7.5 9.5 ns ns 1.5 2 6.5 7 ns ns DM74AS258 Switching Characteristics over recommended operating free air temperature range Symbol tPLH tPHL tPLH tPHL 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 tPZH tPZL Output Enable Time to HIGH Level Output Enable Time to LOW Level tPHZ tPLZ Output Disable Time, from HIGH Level Output Disable Time, from LOW Level OUTPUT Control Any Y OUTPUT Control Any Y Select Any Y From Data To Any Y Conditions VCC = 4.5V to 5.5V, CL = 50 pF, RL = 500 Min 1 1 2 2 Max 5 4 9.5 10 Units ns ns ns ns 2 2 8 10 ns ns 1.5 2 6 6.5 ns ns www.fairchildsemi.com 4 DM74AS257 * DM74AS258 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A 5 www.fairchildsemi.com DM74AS257 * DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/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 reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 6 2. A critical component in 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. www.fairchildsemi.com |
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