TOSHIBA TC74HC148AP/AF TOSHIBA CMOS DIGITAL INTEGRATED CIRCUIT SILICON MONOLITHIC TC74HC148AP, TC74HC148AF 8-TO-3 LINE PRIORITY ENCODER The TC74HC148A is a high speed CMOS 8-to-3 LINE ENCODER fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. All data inputs and outputs of these encoders are active at the low logic level. The encoder detects a low level of the highest order among eight input singals and outputs the corresponding signal position in binaly code. Enable Input EI and Enable Output EO are used to easily cascade without using external circuits. All inputs are equipped with protection circuits against static discharge or transient excess voltage. FEATURES : High Speed----s--esessesseeereseeseseseees tog = 15ns(typ.) at Voc =5V e Low Power Dissipation --------------- loc = 4uA(Max.) at Ta = 25C e High Noise Immunity-++-+++-++-+++++ Vain = Vnit = 28% Voc (Min.) e Output Drive Capability +--+ 10 LSTTL Loads Symmetrical Output Impedance:-| loy | = lot = 4mA(Min.) Balanced Propagation Delays: totH=tpHL e Wide Operating Voltage Range:-:: Vcc (opr.) = 2V~ 6V e Pin and Function Compatible with 74LS148 r iil P ( DIP16-P-300-2.54A ) Weight : 1.00g (Typ.) 16 at aa F (soP1 6-P-300-1.27) Weight : 0.189 (Typ.) PIN ASSIGNMENT 41[ r] 16 Vec 5 20 1] 15 EO 6 3[ []14 Gs 7 4. 13 3 EI 5 [ f] 12 2 A2 6. 11 Al 7[T f]} 10 0 GND 8[ (19 = =AO (TOP VIEW) IEC LOGIC SYMBOL HPRI/ BIN oes 0/Z10 10+ 31 is WZ 11 2U2) SI oy712 12+ 3 UN 3713 13+ (15) aO Nazi ut '8 14 52@ Nois ist PO gs 6s 6/Z16 16+ 7O@ NS 9717 17+ 1x b ) ag V18 20 SN) A, ln EN 3a.) a> 2001-05-17TC74HC148AP/AF TOSHIBA TRUTH TABLE OUTPUTS EO GS AQ Al A2 INPUTS El X: Dont care SYSTEM DIAGRAM El 2001-05-17TOSHIBA TC74HC148AP/AF ABSOLUTE MAXIMUM RATINGS PARAMETER YMBOL VALUE NIT : SYMBO U v *500mW in the range of Ta= Supply Voltage Range Vec 0.5~7 V 40C~65C. From Ta=65C 05~ to 85C a derating factor of DC Input Voltage Vin 0.5~Vec + 0.5 V fOmW/ eC chall be apelied DC Output Voltage Vout 0.5~Vee + 0.5 V until 300mW. Input Diode Current lik +20 mA Output Diode Current lox +20 mA DC Output Current lout +25 mA DC Vec /Ground Current lec +50 mA Power Dissipation Pp 500 (DIP)* / 180 (SOP) mw Storage Temperature Tstg 65~150 C RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL VALUE UNIT Supply Voltage Vec 2~6 Vv Input Voltage Vin 0O~Vec Vv Output Voltage Vout 0~Vec V Operating Temperature Topr 40~85 C Input Rise and Fall Time tr, tf O~ 500(Vec = 4.5V) ns DC ELECTRICAL CHARACTERISTICS Ta=25C Ta = 40~85C PARAMETER SYMBOL TEST CONDITION Vec UNIT (V) | MIN. | TYP. | MAX. | MIN. | MAX. High - Level 2.0 | 1.50 7 7 1.50 7 Input Voltage Vin 4.5 | 3.15 3.15 V P g 6.0] 4.20} | 420] - Low - Level 2.0 0.50 0.50 Input Voltage ViL 4.5 1.35 1.35 V p g 6.0| | 180] | 1.80 2.0 | 1.9 2.0 1.9 . lon = 204A 4.5 | 4.4 4.5 _ 4.4 _ High - Level Vin= _ _ Output Voltage Vou Vig orViL 6.0 | 5.9 6.0 9 Vv loo =4 mA} 4.5] 4.18 | 4.31 _ 4.13 _ lon =5.2mMA | 6.0 | 5.68 | 5.80 _ 5.63 _ 2.0 _ 0.0 0.1 _ 0.1 lo. = 20uA 45} | 00 | 0.1 | 01 Low - Level Ving _ 1 _ 1 Output Voltage Vou Vin or Vit 6.0 Oo | 0. 0. Vv lo.=4 mA 45} | 0.17 | 0.26] | 0.33 lo. =5.2mA 6.0 _ 0.18 | 0.26 _ 0.33 Input Leakage Current lin Vin =Vecc or GND 6.0 _ _ +0.1 _ +1.0 A Quiescent Supply Current lee Vin =Vec or GND 6.0 _ _ 4.0 _ 40.0 e 3 2001-05-17TOSHIBA TC74HC148AP/AF AC ELECTRICAL CHARACTERISTICS (C_ = 15pF, Vcc=5V, Ta = 25C, Input t, = t=6ns) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT t Output Transition Time L. _ 4 8 THL Propagation Delay Time toy _ 15 25 (INAO, A1, A2) tout Propagation Delay Time toy _ 15 25 (INEO, GS) tox ns Propagation Delay Time toy _ 1 19 (EIEO) tout Propagation Delay Time toa _ Tr 19 (EIGS) toHL Propagation Delay Time toy _ Tr 19 (EIA0, A1, A2) toa AC ELECTRICAL CHARACTERISTICS ( C, = 50pF, Input t, = t;=6ns ) Ta =25C Ta = 40~85C PARAMETER SYMBOL | TEST CONDITION VectV)| MIN. | TYP. | MAX.| MIN. | MAX. UNIT t 20 {| | 30 | 75 | | 95 Output Transition Time L. 4.5 8 15 19 THL 6.0 _ 7 13 _ 16 Propagation Delay Time to a8 _ 3 13 _ 128 (INAO, A1, A2) toHL 6.0 _ 15 26 _ 33 Propagation Delay Time toy a8 _ 23 3 _ 133 (INEO, GS) tort 6o | | 15 | 26 | 33 | Propagation Delay Time toy ae _ a "2 _ 39 (EI-EO) ton 6.0 | 11 20 | - 25 Propagation Delay Time toy ae _ a "2 _ 38 (EIGS) tox 6.0 | 12 20 | - 25 Propagation Delay Time toi ae _ a "2 _ 3 (EIA0, Al, A2) ton 6.0 | 12 20 | 25 Input Capacitance Cin 5 10 10 FE Power Dissipation Capacitance | Cpp (1) 55 _ _ _ P Note (1) Cpp 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) =Cpp * Vee * fin + lec 4 2001-05-17TOSHIBA TC74HC148AP/AF TYPICAL APPLICATION 4BIT CASCADE CONNECTION 15 14 13 12 11 10 9 8 7654 3 21 0 765423210 76543 210 El EO El EO P E0= L WITH IN = H GS A2 Al AO GS A2 Al AO oO oO 1 T ] 0 TC74HCO8 PRIORITY FLAG A3 A2 Al AO 5 2001-05-17TOSHIBA TC74HC148AP/AF DIP 16PIN PACKAGE DIMENSIONS (DIP16-P-300-2.54A ) Unit in mm 18 moo ee & a uu + a ~2 3 3 / 19.75MAx 19.250.2 0.95:0.1 Q.735TYP | | Weight : 1.00g (Typ.) Unit in mm SOP 16PIN (200mil BODY) PACKAGE DIMENSIONS ( SOP16-P-300-1.27 ) 16 90 HHEHHEEE HEH HAHAHA oe 0.705TYP i 0.43104 10.25 0) 1.27 10.8MAX 0.1578-45 0,810.2 Weight : 0.18g (Typ.) 6 2001-05-17TOSHIBA TC74HC148AP/AF RESTRICTIONS ON PRODUCT USE 000707EBA @ TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the Handling Guide for Semiconductor Devices, or TOSHIBA Semiconductor Reliability Handbook etc.. @ The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (Unintended Usage). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer's own risk. @ The products described in this document are subject to the foreign exchange and foreign trade laws. @ The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. @ The information contained herein is subject to change without notice. 7 2001-05-17