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| DM74ALS138 3 to 8 Line Decoder/Demultiplexer September 1986 Revised February 2000 DM74ALS138 3 to 8 Line Decoder/Demultiplexer General Description These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing applications, requiring very short propagation delay times. In high-performance memory systems these decoders can be used to minimize the effects of system decoding. When used with high-speed memories, the delay times of these decoders are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoder is negligible. The DM74ALS138 decodes one-of-eight lines, based upon the conditions at the three binary select inputs and the three enable inputs. Two active-LOW and one active-HIGH enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented with no external inverters, and 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications. This decoder/demultiplexer features fully buffered inputs, presenting only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and simplify system design. Features s Designed specifically for high speed: Memory decoders Data transmission systems s 3- to 8-line decoder incorporates 3 enable inputs to simplify cascading and/or data reception s Low power dissipation...23 mW typ s Switching specifications guaranteed over full temperature and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process Ordering Code: Order Number DM74ALS138M DM74ALS138SJ DM74ALS138N Package Number M16A M16D N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 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 Enable Inputs G1 X L H H H H H H H H C G2 (Note 1) H X L L L L L L L L X X L L L L H H H H Select Inputs B X X L L H H L L H H Outputs A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X L H L H L H L H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L H H H H H H H H H H L Note 1: G2 = G2A + G2B (c) 2000 Fairchild Semiconductor Corporation DS006111 www.fairchildsemi.com DM74ALS138 Logic Diagram www.fairchildsemi.com 2 DM74ALS138 Absolute Maximum Ratings(Note 2) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 75.5C/W 104.0C/W 7V 7V 0C to +70C -65C to +150C Note 2: 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 4.5 2 0.8 -0.4 8 70 Nom 5 Max 5.5 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH VOL II IIH IIL IO 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 Output Drive Current Supply Current IOH = -0.4 mA VCC = 4.5V to 5.5V VCC = 4.5V VCC = 5.5V, VIH = 7V VCC = 5.5V, VIH = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V VCC = 5.5V VO = 2.25V -30 5 IOL = 8 mA 0.35 0.5 0.1 20 -0.1 -112 10 V mA A mA mA mA Conditions VCC = 4.5V, II = -18 mA VCC - 2 Min Typ Max -1.5 Units V V Switching Characteristics over recommended operating free air temperature range. Symbol 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 Conditions VCC = 4.5V to 5.5V RL = 500 CL = 50 pF From (Input) To (Output) A, B, C to Y A, B, C to Y Enable to Y Enable to Y Min 6 6 4 5 Max 22 18 17 17 Units ns ns ns ns 3 www.fairchildsemi.com DM74ALS138 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 4 DM74ALS138 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 5 www.fairchildsemi.com DM74ALS138 3 to 8 Line Decoder/Demultiplexer 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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