DM74LS154N

Revised March 2000 DM74LS154 4-Line to 16-Line Decoder/Demultiplexer General Description Features Each of these 4-line-to-16-line decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, G1 and G2, are LOW. The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input LOW. When either strobe input is HIGH, all outputs are HIGH. These demultiplexers are ideally suited for implementing high-performance memory decoders. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. ■ Decodes 4 binary-coded inputs into one of 16 mutually exclusive outputs ■ Performs the demultiplexing function by distributing data from one input line to any one of 16 outputs ■ Input clamping diodes simplify system design ■ High fan-out, low-impedance, totem-pole outputs ■ Typical propagation delay 3 levels of logic 23 ns Strobe 19 ns ■ Typical power dissipation 45 mW Ordering Code: Order Number Package Number Package Description DM74LS154WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS154N N24A 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram © 2000 Fairchild Semiconductor Corporation Logic Diagram DS006394 www.fairchildsemi.com DM74LS154 4-Line to 16-Line Decoder/Demultiplexer August 1986 DM74LS154 Function Table Inputs Outputs G1 G2 D C B A 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 L L L L L L L H H H H H H H H H H H H H H H L L L L L H H L H H H H H H H H H H H H H H L L L L H L H H L H H H H H H H H H H H H H L L L L H H H H H L H H H H H H H H H H H H L L L H L L H H H H L H H H H H H H H H H H L L L H L H H H H H H L H H H H H H H H H H L L L H H L H H H H H H L H H H H H H H H H L L L H H H H H H H H H H L H H H H H H H H L L H L L L H H H H H H H H L H H H H H H H L L H L L H H H H H H H H H H L H H H H H H L L H L H L H H H H H H H H H H L H H H H H L L H L H H H H H H H H H H H H H L H H H H L L H H L L H H H H H H H H H H H H L H H H L L H H L H H H H H H H H H H H H H H L H H L L H H H L H H H H H H H H H H H H H H L H L L H H H H H H H H H H H H H H H H H H H L L H X X X X H H H H H H H H H H H H H H H H H L X X X X H H H H H H H H H H H H H H H H H H X X X X H H H H H H H H H H H H H H H H H = HIGH Level L = Low Level X = Don’t Care www.fairchildsemi.com 2 Supply Voltage 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. 7V Input Voltage 7V 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Recommended Operating Conditions Symbol Parameter Min Nom Max 4.75 5 5.25 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −0.4 mA IOL LOW Level Output Current 8 mA TA Free Air Operating Temperature 70 °C 2 V 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = −18 mA VOH HIGH Level VCC = Min, IOH = Max Output Voltage VIL = Max, VIH = Min VOL Min Typ (Note 2) Max −1.5 2.7 3.4 Units V V LOW Level VCC = Min, IOL = Max 0.25 0.4 Output Voltage VIL = Max, VIH = Min 0.35 0.5 IOL = 4 mA, VCC = Min 0.25 0.4 V II Input Current @ Max Input Voltage VCC = Max, VI = 7V 0.1 IIH HIGH Level Input Current VCC = Max, VI = 2.7V 20 µA IIL LOW Level Input Current VCC = Max, VI = 0.4V −0.4 mA IOS Short Circuit Output Current VCC = Max (Note 3) −100 mA ICC Supply Current VCC = Max (Note 4) 14 mA −20 9 mA Note 2: All typicals are at VCC = 5V, TA = 25°C. 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 and all inputs GROUNDED. Switching Characteristics at VCC = 5V and TA = 25°C RL = 2 kΩ From (Input) Symbol Parameter To (Output) CL = 15 pF Min tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output Max CL = 50 pF Min Units Max Data to Output 30 35 ns Data to Output 30 35 ns Strobe to Output 20 25 ns Strobe to Output 25 35 ns 3 www.fairchildsemi.com DM74LS154 Absolute Maximum Ratings(Note 1) DM74LS154 Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M24B www.fairchildsemi.com 4 DM74LS154 4-Line to 16-Line Decoder/Demultiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600 Wide Package Number N24A 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: 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. 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 5 www.fairchildsemi.com