74LS156

DM74LS155 FAIRCHILD | Alldatasheet

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■ Applications: Dual 2-to-4-line decoder Dual 1-to-4-line demultiplexer 3-to-8-line decoder 1-to-8-line demultiplexer ■ Individual strobes simplify cascading for decoding or demultiplexing larger words ■ Input clamping diodes simplify system design ■ Choice of outputs: Totem-pole (DM74LS155) Open-collector (DM74LS156) Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Order Number Package Number Package Description DM74LS155M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS155N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74LS156M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS156N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

www.fairchildsemi.com 2 DM74LS155 • DM74LS156 Function Tables 3-Line-to-8-Line Decoder or 1-Line-to-8-Line Demultiplexer 2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer H = HIGH level L = LOW level X = don't care Note 1: C = inputs C1 and C2 connected together Note 2: G = inputs G1 and G2 connected together Logic Diagram Inputs Outputs Select Strobe (0) (1) (2) (3) (4) (5) (6) (7)Or Data C (Note 1) B A G (Note 2) 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3 X X X H HHHHHHHH L L L L LHHHHHHH L L H L HLHHHHHH L H L L HHLHHHHH L H H L HHHLHHHH H L L L HHHHLHHH H L H L HHHHHLHH H H L L HHHHHHLH H H H L HHHHHHHL Inputs Outputs Select Strobe Data 1Y0 1Y1 1Y2 1Y3BA G 1 C 1 X X H X HHHH L L L H LHHH LH L H H L H H HL L H H H L H HH L H H H H L X X X L HHHH Inputs Outputs Select Strobe Data 2 Y 02 Y 12 Y 22 Y 3BA G 2 C 2 X X H X HHHH LL L L L H H H LH L L H L H H HL L L H H L H HH L L H H H L X X X H HHHH

3 www.fairchildsemi.com DM74LS155 • DM74LS156 Absolute Maximum Ratings(Note 3) Note 3: 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. DM74LS155 Recommended Operating Conditions over recommended operating free air temperature range (unless otherwise noted) Note 4: All typicals are at VCC = 5V, TA = 25° C. Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 6: ICC is measured with all outputs OPEN, A,B, and C1 inputs at 4.5V, and C2, G1, and G2 inputs GROUNDED. DM74LS155 Switching Characteristics at VCC = 5V and TA = 25°C Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units V CC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V VOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 4) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V VOH HIGH Level V CC = Min, IOH = Max 2.7 3.4 V Output Voltage V IL = Max, VIH = Min VOL LOW Level V CC = Min, IOL = Max 0.35 0.5 Output Voltage V IL = Max, VIH = Min V IOL = 4 mA, VCC = Min 0.25 0.4 II Input Current @ Max Input Voltage VCC = Max, VI = 7V 0.1 mA IIH HIGH Level Input Current V CC = Max, VI = 2.7V 20 µA IIL LOW Level Input Current V CC = Max, VI = 0.4V −0.36 mA IOS Short Circuit Output Current V CC = Max (Note 5) −20 −100 mA ICC Supply Current V CC = Max (Note 6) 6.1 10 mA From (Input) R L = 2 kΩ Symbol Parameter To (Output) C L = 15 pF C L = 50 pF Units Min Max Min Max tPLH Propagation Delay Time A, B, C2, G1 18 22 ns LOW-to-HIGH Level Output or G2 to Y tPHL Propagation Delay Time A, B, C2, G1 27 35 ns HIGH-to-LOW Level Output or G2 to Y tPLH Propagation Delay Time A or B 18 24 ns LOW-to-HIGH Level Output to Y tPHL Propagation Delay Time A or B 27 35 ns HIGH-to-LOW Level Output to Y tPLH Propagation Delay Time C1 20 24 ns LOW-to-HIGH Level Output to Y tPHL Propagation Delay Time C1 27 35 ns HIGH-to-LOW Level Output to Y

www.fairchildsemi.com 4 DM74LS155 • DM74LS156 DM74LS156 Recommended Operating Conditions over recommended operating free air temperature range (unless otherwise noted) Note 7: All typicals are at VCC = 5V, TA = 25° C. Note 8: ICC is measured with all outputs OPEN, A, B, and C1 inputs at 4.5V, and C2, G1, and G2 GROUNDED. DM74LS156 Switching Characteristics at VCC = 5V and TA = 25°C Symbol Parameter Min Nom Max Units VCC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL LOW Level Input Voltage 0.8 V VOH HIGH Level Output Voltage 5.5 V IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 7) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V ICEX HIGH Level V CC = Min, VO = 5.5V 100 µA Output Current V IL = Max, VIH = Min VOL LOW Level V CC = Min, IOL = Max 0.35 0.5 Output Voltage V IL = Max, VIH = Min V IOL = 4 mA, VCC = Min 0.25 0.4 II Input Current @ Max Input Voltage VCC = Max, VI = 7V 0.1 mA IIH HIGH Level Input Current V CC = Max, VI = 2.7V 20 µA IIL LOW Level Input Current V CC = Max, VI = 0.4V −0.36 mA ICC Supply Current V CC = Max (Note 8) 6.1 10 mA From (Input) R L = 2 kΩ Symbol Parameter To (Output) C L = 15 pF C L = 50 pF Units Min Max Min Max tPLH Propagation Delay Time A, B, C2, G1 28 53 ns LOW-to-HIGH Level Output or G2 to Y tPHL Propagation Delay Time A, B, C2, G1 33 43 ns HIGH-to-LOW Level Output or G2 to Y tPLH Propagation Delay Time A or B 28 53 ns LOW-to-HIGH Level Output to Y tPHL Propagation Delay Time A or B 33 43 ns HIGH-to-LOW Level Output to Y tPLH Propagation Delay Time C1 28 53 ns LOW-to-HIGH Level Output to Y tPHL Propagation Delay Time C1 34 43 ns HIGH-to-LOW Level Output to Y

5 www.fairchildsemi.com DM74LS155 • DM74LS156 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A

www.fairchildsemi.com 6 DM74LS155 • DM74LS156 Dual 2-Line to 4-Line Decoders/Demultiplexers 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 rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com