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ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. "Typical" parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Revised July 2003 74AC138 * 74ACT138 1-of-8 Decoder/Demultiplexer General Description Features The AC/ACT138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three AC/ACT138 devices or a 1-of-32 decoder using four AC/ACT138 devices and one inverter. ICC reduced by 50% Demultiplexing capability Multiple input enable for easy expansion Active LOW mutually exclusive outputs Outputs source/sink 24 mA ACT138 has TTL-compatible inputs Ordering Code: Order Number Package Number 74AC138SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74AC138SJ 74AC138MTC MTC16 74AC138PC Package Description 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide 74ACT138SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 74ACT138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74ACT138PC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code. Connection Diagram Logic Symbols IEEE/IEC Pin Descriptions Pin Names Description A0-A2 Address Inputs E1-E2 Enable Inputs E3 Enable Input O0-O7 Outputs FACT is a trademark of Fairchild Semiconductor Corporation. (c) 2003 Fairchild Semiconductor Corporation DS009925 www.fairchildsemi.com 74AC138 * 74ACT138 1-of-8 Decoder/Demultiplexer November 1988 74AC138 * 74ACT138 Truth Table Inputs Outputs E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 H X X X X X H H H H H H H H X H X X X X H H H H H H H H X X L X X X H H H H H H H H L L H L L L L H H H H H H H L L H H L L H L H H H H H H L L H L H L H H L H H H H H L L H H H L H H H L H H H H L L H L L H H H H H L H H H L L H H L H H H H H H L H H L L H L H H H H H H H H L H L L H H H H H H H H H H H L H = HIGH Voltage Level L = LOW Voltage Level O7 X = Immaterial Functional Description Logic Diagram The AC/ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive activeLOW outputs (O0-O7). The AC/ACT138 features three Enable inputs, two active-LOW (E1, E2) and one activeHIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four AC/ACT138 devices and one inverter (see Figure 1). The AC/ACT138 can be used as an 8-output demultiplexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes. The Enable inputs which are not used must be permanently tied to their appropriate active-HIGH or active-LOW state. Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. FIGURE 1. Expansion to 1-of-32 Decoding www.fairchildsemi.com 2 Recommended Operating Conditions -0.5V to +7.0V Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V -20 mA VI = VCC + 0.5V +20 mA DC Input Voltage (VI) Supply Voltage (VCC) -0.5V to VCC + 0.5V VO = VCC + 0.5V +20 mA 0V to VCC -40C to +85C Minimum Input Edge Rate (V/t) AC Devices DC Output Source VIN from 30% to 70% of VCC 50 mA VCC @ 3.3V, 4.5V, 5.5V 125 mV/ns Minimum Input Edge Rate (V/t) DC VCC or Ground Current 50 mA per Output Pin (ICC or IGND) Storage Temperature (TSTG) 0V to VCC Operating Temperature (TA) -0.5V to VCC + 0.5V or Sink Current (IO) 4.5V to 5.5V Output Voltage (VO) -20 mA DC Output Voltage (VO) 2.0V to 6.0V ACT Input Voltage (VI) DC Output Diode Current (IOK) VO = -0.5V AC ACT Devices -65C to +150 C VIN from 0.8V to 2.0V Junction Temperature (TJ) VCC @ 4.5V, 5.5V 140C PDIP 125 mV/ns Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation of FACT circuits outside databook specifications. DC Electrical Characteristics for AC Symbol VIH Parameter Minimum HIGH Level Input Voltage VIL VOH TA = +25C VCC (V) Typ 3.0 1.5 TA = -40C to +85C Guaranteed Limits 2.1 2.1 4.5 2.25 3.15 3.15 5.5 2.75 3.85 3.85 Maximum LOW Level 3.0 1.5 0.9 0.9 Input Voltage 4.5 2.25 1.35 1.35 5.5 2.75 1.65 1.65 Minimum HIGH Level 3.0 2.99 2.9 2.9 Output Voltage 4.5 4.49 4.4 4.4 5.5 5.49 5.4 5.4 3.0 2.56 2.46 4.5 3.86 3.76 5.5 4.86 4.76 Units Conditions VOUT = 0.1V V or VCC - 0.1V VOUT = 0.1V V or VCC - 0.1V V IOUT = -50 A VIN = VIL or VIH VOL IOH = -12 mA V IOH = -24 mA IOH = -24 mA (Note 2) Maximum LOW Level 3.0 0.002 0.1 0.1 Output Voltage 4.5 0.001 0.1 0.1 5.5 0.001 0.1 0.1 3.0 0.36 0.44 4.5 0.36 0.44 5.5 0.36 0.44 5.5 0.1 1.0 A VI = VCC, GND 75 mA VOLD = 1.65V Max -75 mA VOHD = 3.85V Min 40.0 A VIN = VCC or GND V IOUT = 50 A VIN = VIL or VIH IIN Maximum Input (Note 4) Leakage Current IOLD Minimum Dynamic IOHD Output Current (Note 3) 5.5 ICC (Note 4) Maximum Quiescent Supply Current 5.5 5.5 4.0 IOL = 12 mA V IOL = 24 mA 0 IOL = 24 mA (Note 2) Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC. 3 www.fairchildsemi.com 74AC138 * 74ACT138 Absolute Maximum Ratings(Note 1) 74AC138 * 74ACT138 DC Electrical Characteristics for ACT Symbol Parameter Minimum HIGH Level VIH VIL VOH TA = +25C VCC (V) Typ 4.5 1.5 TA = -40C to +85C Guaranteed Limits 2.0 2.0 Input Voltage 5.5 1.5 2.0 2.0 Maximum LOW Level 4.5 1.5 0.8 0.8 Units V or VCC - 0.1V VOUT = 0.1V V Input Voltage 5.5 1.5 0.8 0.8 Minimum HIGH Level 4.5 4.49 4.4 4.4 Output Voltage 5.5 5.49 5.4 5.4 3.86 3.76 Conditions VOUT = 0.1V or VCC - 0.1V V IOUT = -50 A V IOH = -24 mA VIN = VIL or VIH 4.5 5.5 VOL IOH = -24 mA (Note 5) 4.86 4.76 Maximum LOW Level 4.5 0.001 0.1 0.1 Output Voltage 5.5 0.001 0.1 0.1 4.5 0.36 0.44 5.5 0.36 0.44 5.5 0.1 1.0 A VI = VCC, GND V IOUT = 50 A V IOL 24 mA VIN = VIL or VIH IIN Maximum Input Leakage Current ICCT Maximum IOL.= 24 mA (Note 5) 1.5 mA VI = VCC - 2.1V IOLD Minimum Dynamic 5.5 75 mA VOLD = 1.65V Max IOHD Output Current (Note 6) 5.5 -75 mA VOHD = 3.85V Min ICC Maximum Quiescent 40.0 A VIN = VCC or GND 5.5 ICC/Input Supply Current 0.6 5.5 4.0 Note 5: All outputs loaded; thresholds on input associated with output under test. Note 6: Maximum test duration 2.0 ms, one output loaded at a time. AC Electrical Characteristics for AC Symbol tPLH tPHL tPLH tPHL tPLH tPHL Parameter VCC TA = +25C (V) CL = 50 pF TA = -40C to +85C CL = 50 pF (Note 7) Min Typ Max Min Max Propagation Delay 3.3 1.5 8.5 13.0 1.5 15.0 An to On 5.0 1.5 6.5 9.5 1.5 10.5 Propagation Delay 3.3 1.5 8.0 12.5 1.5 14.0 An to On 5.0 1.5 6.0 9.0 1.5 10.5 Propagation Delay 3.3 1.5 11.0 15.0 1.5 16.0 E1 or E2 to On 5.0 1.5 8.0 11.0 1.5 12.0 Propagation Delay 3.3 1.5 9.5 13.5 1.5 15.0 E1 or E2 to On 5.0 1.5 7.0 9.5 1.5 10.5 Propagation Delay 3.3 1.5 11.0 15.5 1.5 16.5 E3 to On 5.0 1.5 8.0 11.0 1.5 12.5 Propagation Delay 3.3 1.5 8.5 13.0 1.5 14.0 E3 to On 5.0 1.5 6.0 8.0 1.0 9.5 Note 7: Voltage Range 3.3 is 3.3V 0.3V Voltage Range 5.0 is 5.0V 0.5V www.fairchildsemi.com 4 Units ns ns ns ns ns ns Symbol tPLH Parameter Propagation Delay An to On tPHL Propagation Delay An to On tPLH Propagation Delay E1 or E2 to On tPHL Propagation Delay E1 or E2 to On tPLH Propagation Delay E3 to On Propagation Delay tPHL E3 to On VCC TA = +25C (V) CL = 50 pF TA = -40C to +85C CL = 50 pF Units (Note 8) Min Typ Max Min Max 5.0 1.5 7.0 10.5 1.5 11.5 ns 5.0 1.5 6.5 1.5 11.5 ns 5.0 2.5 8.0 11.5 2.0 12.5 ns 5.0 2.0 7.5 11.5 2.0 12.5 ns 5.0 2.5 8.0 12.0 2.0 13.0 ns 5.0 2.0 6.5 10.5 1.5 11.5 ns 10.5 Note 8: Voltage Range 5.0 is 5.0V 0.5V Capacitance Typ Units CIN Symbol Input Capacitance Parameter 4.5 pF VCC = OPEN CPD Power Dissipation Capacitance 60.0 pF VCC = 5.0V 5 Conditions www.fairchildsemi.com 74AC138 * 74ACT138 AC Electrical Characteristics for ACT 74AC138 * 74ACT138 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 74AC138 * 74ACT138 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 7 www.fairchildsemi.com 74AC138 * 74ACT138 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 www.fairchildsemi.com 8 74AC138 * 74ACT138 1-of-8 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: 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. 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ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. 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