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DM74S253 Dual 3-STATE 1-of-4 Line Data Selector/Multiplexer
August 1986 Revised May 2000
DM74S253 Dual 3-STATE 1-of-4 Line 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 enable output will drive the bus line to a HIGH or LOW logic level.
Features
s 3-STATE version of S153 with same pin-out s Schottky-diode-clamped transistors s Permits multiplexing from N lines to 1 line s Performs parallel-T-serial conversion s Strobe/output control s High fan-out totem-pole outputs s Typical propagation delay From data to output From select to output 6 ns 12 ns
s Typical power dissipation 275 mW
Ordering Code:
Order Number DM74S253N Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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
(c) 2000 Fairchild Semiconductor Corporation
DS006481
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DM74S253
Logic Diagram
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DM74S253
Absolute Maximum Ratings(Note 1)
Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 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 4.75 2 0.8 -6.5 20 70 Nom 5 Max 5.25 Units V V V mA mA C
Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOZH IOZL IOS ICC 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 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 Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max VIL = Max, VIH = Min VCC = Min, IOL = Max VIH = Min, VIL = Max VCC = Max, VI = 5.5V VCC = Max, VI = 2.7V VCC = Max, VI = 0.5V VCC = Max, VO = 2.4V VIH = Min, VIL = Max VCC = Max, VO = 0.5V VIH = Min, VIL = Max VCC = Max (Note 3) VCC = Max (Note 4) -40 55 2.4 3.2 0.5 1 50 -2 50 -50 -100 70 Min Typ (Note 2) Max -1.2 Units V V V mA A mA A A mA mA
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: ICC is measured with all outputs OPEN.
Switching Characteristics
at VCC = 5V and TA = 25C RL = 280 Symbol Parameter From (Input) To (Output) 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 to HIGH Level Output (Note 5) Output Disable Time to LOW Level Output (Note 5) 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 CL = 15 pF Min Max 9 9 18 18 16.5 18 9.5 15 CL = 50 pF Min Max 12 12 21 21 19.5 21 ns ns ns ns ns ns ns ns Units
Note 5: CL = 5 pF.
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DM74S253 Dual 3-STATE 1-of-4 Line Data Selector/Multiplexer
Physical Dimensions inches (millimeters) unless otherwise noted
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 4 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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