TC74HCT138AP/AF/AFN TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HCT138AP,TC74HCT138AF,TC74HCT138AFN 3-to-8 Line Decoder The TC74HCT138A is a high speed CMOS 3-to-8 LINE DECODER fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. This device may be used as a level converter for interfacing TTL or NMOS to High Speed CMOS. The inputs are compatible with TTL, NMOS and CMOS output voltage levels. When the device is enabled, 3 Binary Select inputs (A, B and C) determine which one of the outputs ( Y0 - Y7 ) will go low. When enable input G1 is held low or either G2A or G2B is held high, decoding function is inhibited and all outputs go high. G1, G2A , and G2B inputs are provided to ease cascade connection and for use as an address decoder for memory systems. All inputs are equipped with protection circuits against static discharge or transient excess voltage. Note: xxxFN (JEDEC SOP) is not available in Japan. TC74HCT138AP TC74HCT138AF Features * High speed: tpd = 17 ns (typ.) at VCC = 5 V * Low power dissipation: ICC = 4 A (max) at Ta = 25C * Compatible with TTL outputs: VIH = 2 V (min) * Wide interfacing ability: LSTTL, NMOS, CMOS * Output drive capability: 10 LSTTL loads * * Symmetrical output impedance: |IOH| = IOL = 4 mA (min) tpHL Balanced propagation delays: tpLH - * Pin and function compatible with 74LS138 TC74HCT138AFN VIL = 0.8 V (max) Weight DIP16-P-300-2.54A SOP16-P-300-1.27A SOL16-P-150-1.27 Pin Assignment 1 : 1.00 g (typ.) : 0.18 g (typ.) : 0.13 g (typ.) 2007-10-01 TC74HCT138AP/AF/AFN IEC Logic Symbol Truth Table Inputs Outputs Enable Select Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Selected Output G1 G2 A G 2B C B A L X X X X X H H H H H H H H None X H X X X X H H H H H H H H None X X H X X X H H H H H H H H None H L L L L L L H H H H H H H Y0 H L L L L H H L H H H H H H Y1 H L L L H L H H L H H H H H Y2 H L L L H H H H H L H H H H Y3 H L L H L L H H H H L H H H Y4 H L L H L H H H H H H L H H Y5 H L L H H L H H H H H H L H Y6 H L L H H H H H H H H H H L Y7 X: Don't care Logic Diagram 2 2007-10-01 TC74HCT138AP/AF/AFN Absolute Maximum Ratings (Note 1) Characteristics Symbol Rating Unit Supply voltage range VCC -0.5~7.0 V DC input voltage VIN -0.5~VCC + 0.5 V DC output voltage VOUT -0.5~VCC + 0.5 V Input diode current IIK 20 mA Output diode current IOK 20 mA DC output current IOUT 25 mA DC VCC/ground current ICC 50 mA Power dissipation PD 500 (DIP) (Note 2)/180 (SOP) mW Storage temperature Tstg -65~150 C Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even destruction. Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook ("Handling Precautions"/"Derating Concept and Methods") and individual reliability data (i.e. reliability test report and estimated failure rate, etc). Note 2: 500 mW in the range of Ta = -40 to 65C. From Ta = 65 to 85C a derating factor of -10 mW/C shall be applied until 300 mW. Operating Ranges (Note) Characteristics Symbol Rating Supply voltage VCC 4.5~5.5 V Input voltage VIN 0~VCC V VOUT 0~VCC V Operating temperature Topr -40~85 C Input rise and fall time tr, tf 0~500 ns Output voltage Note: Unit The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND. Electrical Characteristics DC Characteristics Characteristics Symbol Ta = 25C Test Condition Ta = -40~85C VCC (V) Min Typ. Max Min Max Unit High-level input voltage VIH 4.5~5.5 2.0 2.0 V Low-level input voltage VIL 4.5~5.5 0.8 0.8 V High-level output voltage VOH IOH = -20 A VIN = VIH or VIL I OH = -4 mA 4.5 4.4 4.5 4.4 4.5 4.18 4.31 4.13 Low-level output voltage VOL IOL = 20 A VIN = VIH or VIL I = 4 mA OL 4.5 0.0 0.1 0.1 4.5 0.17 0.26 0.33 VIN = VCC or GND 5.5 0.1 1.0 A ICC VIN = VCC or GND 5.5 4.0 40.0 A IC Per input: VIN = 0.5 V or 2.4 V 5.5 2.0 2.9 mA Input leakage current Quiescent supply current IIN V V Other input: VCC or GND 3 2007-10-01 TC74HCT138AP/AF/AFN AC Characteristics (CL = 15 pF, VCC = 5 V, Ta = 25C, input: tr = tf = 6 ns) Characteristics Symbol Test Condition Min Typ. Max Unit 4 8 ns 17 28 ns 15 25 ns 17 28 ns tTLH Output transition time tTHL Propagation delay time tpLH (A, B, C- Y ) tpHL Propagation delay time tpLH (G1- Y ) tpHL Propagation delay time tpLH ( G2 - Y ) tpHL AC Characteristics (CL = 50 pF, input: tr = tf = 6 ns) Characteristics Output transition time Symbol tTLH tTHL Propagation delay time tpLH (A, B, C- Y ) tpHL Propagation delay time tpLH (G1- Y ) tpHL Propagation delay time tpLH ( G2 - Y ) tpHL Input capacitance CIN Power dissipation capacitance CPD Note: (Note) Ta = 25C Test Condition Ta = -40~85C Unit VCC (V) Min Typ. Max Min Max 4.5 8 15 19 5.5 7 14 18 4.5 21 33 44 5.5 18 30 40 4.5 19 30 38 5.5 17 27 34 4.5 22 33 41 5.5 20 30 37 5 10 10 pF 55 pF ns ns ns ns CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr) = CPDVCCfIN + ICC 4 2007-10-01 TC74HCT138AP/AF/AFN Package Dimensions Weight: 1.00 g (typ.) 5 2007-10-01 TC74HCT138AP/AF/AFN Package Dimensions Weight: 0.18 g (typ.) 6 2007-10-01 TC74HCT138AP/AF/AFN Package Dimensions (Note) Note: This package is not available in Japan. Weight: 0.13 g (typ.) 7 2007-10-01 TC74HCT138AP/AF/AFN RESTRICTIONS ON PRODUCT USE * Toshiba Corporation, and its subsidiaries and affiliates (collectively "TOSHIBA"), reserve the right to make changes to the information in this document, and related hardware, software and systems (collectively "Product") without notice. * This document and any information herein may not be reproduced without prior written permission from TOSHIBA. Even with TOSHIBA's written permission, reproduction is permissible only if reproduction is without alteration/omission. * Though TOSHIBA works continually to improve Product's quality and reliability, Product can malfunction or fail. Customers are responsible for complying with safety standards and for providing adequate designs and safeguards for their hardware, software and systems which minimize risk and avoid situations in which a malfunction or failure of Product could cause loss of human life, bodily injury or damage to property, including data loss or corruption. 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