National Semiconductor is now part of Texas Instruments. Search http://www.ti.com/ for the latest technical information and details on our current products and services. 54AC138 * 54ACT138 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. n n n n n n n Logic Symbols Connection Diagrams 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 Standard Microcircuit Drawing (SMD) -- 'AC138: 5962-87622 -- 'ACT138: 5962-87554 Pin Assignment for DIP and Flatpak DS100268-1 IEEE/IEC DS100268-2 Pin Assignment for LCC DS100268-7 Pin Names Description A0-A2 Address Inputs E1-E2 Enable Inputs E3 Enable Input O0-O7 Outputs DS100268-3 FACT (R) is a registered trademark of Fairchild Semiconductor Corporation. (c) 1998 National Semiconductor Corporation DS100268 www.national.com 54AC138 * 54ACT138 1-of-8 Decoder/Demultiplexer August 1998 Functional Description pansion 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. 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 active-LOW outputs (O0-O7). The 'AC/'ACT138 features three Enable inputs, two active-LOW (E1, E2) and one active-HIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel ex- Truth Table Inputs Outputs E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7 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 X = Immaterial www.national.com 2 Logic Diagram DS100268-4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 www.national.com FIGURE 1. Expansion to 1-of-32 Decoding DS100268-5 Logic Diagram www.national.com (Continued) 4 Absolute Maximum Ratings (Note 1) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = -0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP Supply Voltage (VCC) 'AC 'ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 54AC/ACT Minimum Input Edge Rate (V/t) 'AC Devices VIN from 30% to 70% of VCC VCC @ 3.3V, 4.5V, 5.5V Minimum Input Edge Rate (V/t) 'ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V -0.5V to +7.0V -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA +20 mA -0.5V to VCC + 0.5V 50 mA 50 mA -65C to +150C 175C 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC -55C to +125C 125 mV/ns 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. National does not recommend operation of FACT (R) circuits outside databook specifications. DC Characteristics for 'AC Family Devices Symbol Parameter VCC 54AC TA = (V) -55C to +125C Units Conditions Guaranteed Limits VIH VIL VOH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage 3.0 2.1 4.5 3.15 5.5 3.85 3.0 0.9 4.5 1.35 5.5 1.65 3.0 2.9 4.5 4.4 5.5 5.4 3.0 2.4 4.5 3.7 5.5 4.7 3.0 0.1 4.5 0.1 5.5 0.1 3.0 0.50 4.5 0.50 VOUT = 0.1V V or VCC - 0.1V V or VCC - 0.1V VOUT = 0.1V IOUT = -50 A V (Note 2) VIN = VIL or VIH VOL Maximum Low Level Output Voltage -12 mA V IOH -24 mA -24 mA IOUT = 50 A V (Note 2) VIN = VIL or VIH IIN Maximum Input 12 mA V IOL 24 mA 5.5 0.50 5.5 1.0 A VI = VCC, GND 24 mA 5.5 50 mA VOLD = 1.65V Max 5.5 -50 mA VOHD = 3.85V Min Leakage Current IOLD IOHD (Note 3) Minimum Dynamic Output Current 5 www.national.com DC Characteristics for 'AC Family Devices Symbol Parameter (Continued) VCC 54AC TA = (V) -55C to +125C Units Conditions Guaranteed Limits ICC Maximum Quiescent Supply Current VIN = VCC or GND 5.5 80.0 A 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. ICC for 54AC @ 25C is identical to 74AC @ 25C. DC Characteristics for 'ACT Family Devices Symbol Parameter VCC 54ACT TA = (V) -55C to +125C Units Conditions Guaranteed Limits VIH VIL VOH VOL IIN V VOUT = 0.1V V or VCC - 0.1V VOUT = 0.1V V or VCC - 0.1V IOUT = -50 A Minimum High Level Input Voltage 4.5 2.0 5.5 2.0 Maximum Low Level Input Voltage 4.5 0.8 5.5 0.8 4.5 4.4 5.5 5.4 4.5 3.70 5.5 4.70 4.5 0.1 5.5 0.1 4.5 0.50 5.5 0.50 5.5 1.0 A VI = VCC, GND 5.5 1.6 mA VI = VCC - 2.1V Minimum High Level Output Voltage Maximum Low Level Output Voltage Maximum Input (Note 5) VIN = VIL or VIH V IOH -24 mA -24 mA V IOUT = 50 A (Note 5) VIN = VIL or VIH V IOL 24 mA 24 mA Leakage Current ICCT Maximum ICC/Input IOLD IOHD ICC (Note 6) Minimum Dynamic Output Current Maximum Quiescent Supply Current 5.5 50 mA VOLD = 1.65V Max 5.5 -50 mA VOHD = 3.85V Min 5.5 80.0 A VIN = VCC or GND 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. Note 7: ICC for 54ACT @ 25C is identical to 74ACT @ 25C. www.national.com 6 AC Electrical Characteristics 54AC TA = -55C VCC Symbol Parameter (V) to +125C CL = 50 pF (Note 8) Min tPLH tPHL tPLH tPHL tPLH tPHL Fig. Units No. Max Propagation Delay 3.3 1.0 16.0 An to On 5.0 1.5 12.0 Propagation Delay 3.3 1.0 15.0 An to On 5.0 1.5 11.5 Propagation Delay 3.3 1.0 16.5 E1 or E2 to On 5.0 1.5 13.0 Propagation Delay 3.3 1.0 15.5 E1 or E2 to On 5.0 1.5 12.0 Propagation Delay 3.3 1.0 17.0 E3 to On 5.0 1.5 13.5 Propagation Delay 3.3 1.0 15.0 E3 to On 5.0 1.5 11.0 ns ns ns ns ns ns Note 8: Voltage Range 3.3 is 3.3V 0.3V Voltage Range 5.0 is 5.0V 0.5V AC Electrical Characteristics 54ACT TA = -55C VCC Symbol Parameter (V) to +125C CL = 50 pF (Note 9) tPLH Propagation Delay Fig. Units Min Max 5.0 1.5 12.5 ns 5.0 1.5 12.5 ns 5.0 1.5 13.5 ns 5.0 1.5 12.5 ns 5.0 1.5 14.0 ns 5.0 1.5 12.0 ns No. 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 O n tPHL Propagation Delay E3 to O n Note 9: Voltage Range 5.0 is 5.0V 0.5V Capacitance Symbol CIN CPD Typ Units Input Capacitance Parameter 4.5 pF Power Dissipation 60.0 pF Conditions VCC = OPEN VCC = 5.0V Capacitance 7 www.national.com 8 Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) NS Package Number E20A 16 Lead Ceramic Dual-In-Line Package (D) NS Package Number J16A 9 www.national.com 54AC138 * 54ACT138 1-of-8 Decoder/Demultiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16 Lead Ceramic Flatpak (F) NS Package Number W16A LIFE SUPPORT POLICY NATIONAL'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 NATIONAL SEMICONDUCTOR CORPORATION. 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