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| DM74LS253 3-STATE Data Selector/Multiplexer August 1986 Revised March 2000 DM74LS253 3-STATE Data Selector/Multiplexer General Description Each of these Schottky-clamped data selectors/multiplexers contains inverters and drivers to supply fully complementary, on-chip, binary decoding data selection to the AND-OR gates. Separate output control inputs are provided for each of the two four-line sections. The 3-STATE outputs can interface directly with data lines of bus-organized systems. With all but one of the common outputs disabled (at a high impedance state), the low impedance of the single enabled output will drive the bus line to a HIGH or LOW logic level. Features s 3-STATE version of DM74LS153 with same pinout s Schottky-diode-clamped transistors s Permit multiplexing from N-lines to one line s Performs parallel-to-serial conversion s Strobe/output control s High fanout totem-pole outputs s Typical propagation delay Data to output Select to output 12 ns 21 ns s Typical power dissipation 35 mW Ordering Code: Order Number DM74LS253M DM74LS253N Package Number 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 Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Connection Diagram Function Table Select Inputs B X L L L L H H H H A X L L H H L L H H C0 X L H X X X X X X C1 X X X L H X X X X C2 X X X X X L H X X C3 X X X X X X X L H Data Inputs Output Control G H L L L L L L L L Y Z L H L H L H L H Output Address Inputs A and B are common to both sections. H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance (OFF) (c) 2000 Fairchild Semiconductor Corporation DS006416 www.fairchildsemi.com DM74LS253 Logic Diagram www.fairchildsemi.com 2 DM74LS253 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 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" 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 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 4.75 2 0.8 -2.6 24 70 Nom 5 Max 5.25 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage II IIH IIL IOZH IOZL IOS ICC1 ICC2 Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Off-State Output Current with HIGH Level Output Voltage Applied Off-State Output Current with LOW Level Output Voltage Applied Short Circuit Output Current Supply Current Supply Current Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 12 mA, VCC = Min VCC = Max, VI = 7V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max, VO = 2.7V VIH = Min, VIL = Max VCC = Max, VO = 0.4 VIH = Min, VIL = Max VCC = Max (Note 3) VCC = Max (Note 4) VCC = Max (Note 5) -20 7 8.5 2.4 3.1 0.5 0.4 0.1 20 -0.4 20 -20 -100 12 14 mA A mA A A mA mA mA Min Typ (Note 2) Max -1.5 Units V V V Note 2: All typicals are at VCC = 5V, TA = 25C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 4: ICC1 is measured with all outputs OPEN, and all the inputs grounded. Note 5: ICC2 is measured with the outputs OPEN, OUTPUT CONTROL at 4.5V and all other inputs grounded. 3 www.fairchildsemi.com DM74LS253 Switching Characteristics at VCC = 5V and TA = 25C From (Input) Symbol Parameter To (Output) CL = 45 pF Min tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ 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 Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output (Note 6) Output Disable Time from LOW Level Output (Note 6) Note 6: CL = 5 pF. RL = 667 CL = 150 pF Min Max 35 30 54 44 32 35 ns ns ns ns ns ns ns ns Units Max 25 20 45 32 18 23 41 27 Data to Y Data to Y Select to Y Select to Y Output Control to Y Output Control to Y Output Control to Y Output Control to Y www.fairchildsemi.com 4 DM74LS253 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 DM74LS253 3-STATE Data Selector/Multiplexer 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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