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. 1 of 8 54FCT138 1-of-8 Decoder/Demultiplexer General Description Features The FCT138 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 FCT138 devices or a 1-of-32 decoder using four FCT138 devices and one inverter. n n n n Demultiplexing capability Multiple input enable for easy expansion Active LOW mutually exclusive outputs Outputs sink capability of 32mA, source capability of 12mA n TTL input and output level compatible n CMOS power consumption n Standard Microcircuit Drawing (SMD) 5962-8765401 Ordering Code Military Package Package Description Number 54FCT138DMQB J16A 16-Lead Ceramic Dual-In-Line 54FCT138FMQB W16A 16-Lead Cerpack 54FCT138LMQB E20A 20-Lead Ceramic Leadless Chip Carrier, Type C Logic Symbols 54FCT138 1-of-8 Decoder/Demultiplexer October 1999 Connection Diagrams Pin Assignment for DIP and Flatpak DS100963-1 IEEE/IEC DS100963-2 Pin Assignment for LCC DS100963-7 Pin Names Description A0-A2 Address Inputs E1-E2 Enable Inputs E3 Enable Input O0-O7 Outputs DS100963-3 FACT (R) is a registered trademark of Fairchild Semiconductor Corporation. (c) 1999 National Semiconductor Corporation DS100963 www.national.com 2 of 8 54FCT138 Functional Description pansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four FCT138 devices and one inverter (see Figure 1). The FCT138 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 FCT138 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 FCT138 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 exInputs 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 Logic Diagram DS100963-4 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 3 of 8 DS100963-5 (Continued) 3 54FCT138 FIGURE 1. Expansion to 1-of-32 Decoding Logic Diagram www.national.com 4 of 8 54FCT138 Absolute Maximum Ratings (Note 1) in LOW State (Max) DC Latchup Source Current If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias Ceramic VCC Pin Potential to Ground Pin Input Voltage (Note 1) Input Current (Note 1) Voltage Applied to Any Output in the Disabled or Power-Off State in the HIGH State Current Applied to Output Twice the rated IOL (mA) -500 mA Recommended Operating Conditions -65C to +150C -55C to +125C Free Air Ambient Temperature Military Supply Voltage Military Minimum Input Edge Rate Data Input Enable Input -55C to +175C -0.5V to +7.0V -0.5V to +7.0V -30 mA to +5.0 mA -55C to +125C +4.5V to +5.5V (V/t) 50 mV/ns 20 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. -0.5V to +5.5V -0.5V to VCC DC Characteristics for 'FCT Family Devices Symbol Parameter FCT138 Min VIH Input HIGH Voltage VIL Input LOW Voltage VCD Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH Current Units 2.0 54FCT 4.3 54FCT 2.4 VCC Conditions Max V Recognized HIGH Signal 0.8 V -1.2 V Min Recognized LOW Signal IIN = -18 mA V Min V Min IOH = -12 mA IOL = 300 A A Max IOL = 32 mA VIN = VCC 54FCT 0.2 54FCT 0.5 5 IOH = -300 A VIN = 0.0V VOUT = 0.0V IIL Input LOW Current -5 A Max IOS Output Short-Circuit Current -60 mA Max ICCQ Quiescent Power Supply Current 1.5 mA Max ICC Quiescent Power Supply Current 2.0 mA Max ICCD Dynamic ICC 0.4 mA/ MHz Max Outputs Open, VCC = 5.5V, VIN 5.3V or VIN < 0.2V, One Bit Toggling, 50% Duty Cycle, OE = GND, LE = VCC ICCT Total Power Supply Current 5.5 mA Max Outputs Open, fCP = 10 MHz, VCC = 5.5V, VIN 5.3V or VIN < 0.2V, One Bit Toggling, 50% Duty Cycle, OE = GND, LE = VCC VIN < 0.2V or VIN 5.3V, VCC = 5.5V VI = 3.4V, VCC = 5.5V 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. www.national.com 4 5 of 8 54FCT TA = -55C VCC Symbol Parameter (V) to +125C CL = 50 pF (Note 4) tPLH Propagation Delay Fig. Units Min Max 5.0 1.0 12.0 ns 5.0 1.0 12.0 ns 5.0 1.0 12.5 ns 5.0 1.0 12.5 ns 5.0 1.0 12.5 ns 5.0 1.0 12.5 ns 54FCT138 AC Electrical Characteristics 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 4: 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 5 www.national.com 6 of 8 54FCT138 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 www.national.com 6 7 of 8 54FCT138 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 AND GENERAL COUNSEL OF NATIONAL 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 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. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Francais Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 2. A critical component is 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. 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