74S138

DM74S138 FAIRCHILD | Alldatasheet

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Technical content

Features

I Designed specifically for high speed: Memory decoders Data transmission systems I DM74S138 3-to-8-line decoders incorporates 3 enable inputs to simplify cascading and/or data reception I DM74S139 contains two fully independent 2-to-4-line decoders/demultiplexers I Schottky clamped for high performance I Typical propagation delay time (3 levels of logic) DM74S138 8 ns DM74S139 7.5 ns I Typical power dissipation DM74S138 245 mW DM74S139 300 mW Ordering Code: Order Number Package Number Package Description DM74S138N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74S139N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

www.fairchildsemi.com 2 DM74S138  DM74S139 Connection Diagrams DM74S138 DM74S139 Function Tables DM74S138 DM74S139 * G2 = G2A + G2B H = HIGH level L = LOW level X = don’t care (either LOW or HIGH logic level) Logic Diagrams DM74S138 DM74S139 Inputs OutputsEnable Select G1 G2* C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X HX X X HHHHH H HH L XX X X HHHHH H HH H L LLL L H H H H H H H HL L L H H L H H H H H H HL L H L H H L H H H H H H LL H H HHHLH H HH H LH L L HHHHLH HH H LH L H HHHHHLHH H LH H L HHHHH HLH H LH H H HHHHH H HL Inputs OutputsEnable Select G BAY 0Y 1Y 2Y 3 H X X HHHH L L L LHHH LL H H L H H LH L H H L H L H H HHHL

3 www.fairchildsemi.com DM74S138  DM74S139 Absolute Maximum Ratings(Note 1) 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

Electrical Characteristics

over recommended operating free air temperature (unless otherwise noted) 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 enabled and OPEN. Supply Voltage 7V Input Voltage 5.5V 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 IOH HIGH Level Output Current −1m A IOL LOW Level Output Current 20 mA TA Free Air Operating Temperature 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 2) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.2 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 0.5 V Output Voltage V IH = Min, VIL = Max II Input Current @ Max Input Voltage VCC = Max, VI = 5.5V 1 mA IIH HIGH Level Input Current V CC = Max, VI = 2.7V 50 µA IIL LOW Level Input Current V CC = Max, VI = 0.5V −2m A IOS Short Circuit Output Current V CC = Max (Note 3) −40 −100 mA ICC Supply Current (DM74S138) V CC = Max (Note 4) 49 74 mA ICC Supply Current (DM74S139) V CC = Max (Note 4) 60 90 mA

www.fairchildsemi.com 4 DM74S138  DM74S139 DM74S138 Switching Characteristics at VCC = 5V and TA = 25°C DM74S139 Switching Characteristics at VCC = 5V and TA = 25°C R L = 280Ω Symbol Parameter From (Input) Levels C L = 15 pF C L = 50 pF Units To (Output) of Delay Min Max Min Max tPLH Propagation Delay Time Select to Output 2 7 9 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Output 2 10.5 14 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Output 3 12 14 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Output 3 12 15 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Enable to Output 2 8 10 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Enable to Output 2 11 14 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Enable to Output 3 11 13 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Enable to Output 3 11 14 ns HIGH-to-LOW Level Output R L = 280Ω Symbol Parameter From (Input) Levels C L = 15 pF C L = 50 pF Units To (Output) of Delay Min Max Min Max tPLH Propagation Delay Time Select to Output 2 7.5 10 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Output 2 10 13 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Select to Output 3 12 13 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Select to Output 3 12 15 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time Enable to Output 2 8 10 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time Enable to Output 2 10 13 ns HIGH-to-LOW Level Output

5 www.fairchildsemi.com DM74S138  DM74S139 Decoder/Demultiplexer 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 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