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DM74LS155 * DM74LS156 Dual 2-Line to 4-Line Decoders/Demultiplexers
August 1986 Revised April 2000
DM74LS155 * DM74LS156 Dual 2-Line to 4-Line Decoders/Demultiplexers
General Description
These TTL circuits feature dual 1-line-to-4-line demultiplexers with individual strobes and common binary-address inputs in a single 16-pin package. When both sections are enabled by the strobes, the common address inputs sequentially select and route associated input data to the appropriate output of each section. The individual strobes permit activating or inhibiting each of the 4-bit sections as desired. Data applied to input C1 is inverted at its outputs and data applied at C2 is true through its outputs. The inverter following the C1 data input permits use as a 3-to-8line decoder, or 1-to-8-line demultiplexer, without external gating. Input clamping diodes are provided on these circuits to minimize transmission-line effects and simplify system design.
Features
s Applications: Dual 2-to-4-line decoder Dual 1-to-4-line demultiplexer 3-to-8-line decoder 1-to-8-line demultiplexer s Individual strobes simplify cascading for decoding or demultiplexing larger words s Input clamping diodes simplify system design s Choice of outputs: Totem-pole (DM74LS155) Open-collector (DM74LS156)
Ordering Code:
Order Number DM74LS155M DM74LS155N DM74LS156M DM74LS156N 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
(c) 2000 Fairchild Semiconductor Corporation
DS006395
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DM74LS155 * DM74LS156
Function Tables
3-Line-to-8-Line Decoder or 1-Line-to-8-Line Demultiplexer Inputs Select C (Note 1) X L L L L H H H H B X L L H H L L H H A X L H L H L H L H Strobe Or Data G (Note 2) H L L L L L L L L (0) 2Y0 H L H H H H H H H (1) 2Y1 H H L H H H H H H (2) 2Y2 H H H L H H H H H Outputs (3) 2Y3 H H H H L H H H H (4) 1Y0 H H H H H L H H H (5) 1Y1 H H H H H H L H H (6) 1Y2 H H H H H H H L H (7) 1Y3 H H H H H H H H L
2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer Inputs Select B X L L H H X A X L H L H X Strobe G1 H L L L L X Data C1 X H H H H L 1Y0 H L H H H H Outputs 1Y1 H H L H H H 1Y2 H H H L H H 1Y3 H H H H L H Select B X L L H H X A X L H L H X Inputs Strobe G2 H L L L L X Data C2 X L L L L H 2Y0 H L H H H H Outputs 2Y1 H H L H H H 2Y2 H H H L H H 2Y3 H H H H L H
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
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DM74LS155 * DM74LS156
Absolute Maximum Ratings(Note 3)
Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0C to +70C -65C to +150C
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
Symbol VCC VIH VIL VOH 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 -0.4 8 70 Nom 5 Max 5.25 Units V V V mA mA C
DM74LS155 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 IOS ICC Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output 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 = 4 mA, VCC = Min VCC = Max, VI = 7V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max (Note 5) VCC = Max (Note 6) -20 6.1 2.7 3.4 0.35 0.25 0.5 0.4 0.1 20 -0.36 -100 10 mA A mA mA mA Min Typ (Note 4) Max -1.5 Units V V
V
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 = 25C From (Input) Symbol Parameter To (Output) A, B, C2, G1 or G2 to Y A, B, C2, G1 or G2 to Y A or B to Y A or B to Y C1 to Y C1 to Y CL = 15 pF Min tPLH tPHL tPLH tPHL tPLH tPHL 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 Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Max 18 27 18 27 20 27 RL = 2 k CL = 50 pF Min Max 22 35 24 35 24 35 ns ns ns ns ns ns Units
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DM74LS155 * DM74LS156
DM74LS156 Recommended Operating Conditions
Symbol VCC VIH VIL VOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4.75 2 0.8 5.5 8 70 Nom 5 Max 5.25 Units V V V V mA C
DM74LS156 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) Symbol VI ICEX VOL Parameter Input Clamp Voltage HIGH Level Output Current LOW Level Output Voltage II IIH IIL ICC Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Supply Current Conditions VCC = Min, II = -18 mA VCC = Min, VO = 5.5V VIL = Max, VIH = Min VCC = Min, IOL = Max VIL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max, VI = 7V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max (Note 8) 6.1 0.35 0.25 Min Typ (Note 7) Max -1.5 100 0.5 0.4 0.1 20 -0.36 10 mA A mA mA Units V A
V
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 = 25C From (Input) Symbol tPLH tPHL 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 Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output To (Output) A, B, C2, G1 or G2 to Y A, B, C2, G1 or G2 to Y A or B to Y A or B to Y C1 to Y C1 to Y CL = 15 pF Min Max 28 33 28 33 28 34 RL = 2 k CL = 50 pF Min Max 53 43 53 43 53 43 ns ns ns ns ns ns Units
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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
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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 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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