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. 16 P ( DIP16-P-300-2.54A ) Weight : 1.00g (Typ.) F (SOP 16-P-300-1.27 ) Weight : 0.18g (Typ.) PIN ASSIGNMENT FEATURES : \/ : 4 1 C i 16 Vec e High Speed senneesecesceneeaeeeseeesenconsenses toa = 15ns(typ.) at Vcc =5V e Low Power Dissipation --------+++--++- loc = 4vA(Max.) at Ta= 25C 520 [] 15 0 High Noise Immunity: Vin = Vnit = 28% Voc (Min.) 6 3 [] 14 Gs + Output Drive Capability 10 LSTTL Loads 740 [] 13 e Symmetrical Output Impedance---| lon | = lot = 4mA(Min.) A5[ f] 12 Balanced Propagation Delays: tpLH=tpHL A2 6 0 1 111 + Wide Operating Voltage Range-- Vcc (opr.) =2V~6V Al 7 [110 0 Pin and Function Compatible with 74LS148 GND 8[ (19 = =AO (TOP VIEW) IEC LOGIC SYMBOL HPRI/ BIN op CON oz10 10F 31 1OD ON aa at 2 CAL 9712 12+ 3 UBL 3713 13+ rat) 9 4WLN azia tat (14) 52 Nozi5 ist Pas 6GLN ezi6 16+ 7ON 7217 7+ 1 bh (9) AO ej 2) EN 3xP-6) a> 961001EBA2 @ TOSHIBA is continually working to improve the quality and the 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 observe standards of safety, and to avoid situations in which a malfunction or failure of a TOSHIBA product 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 products specifications. Also, please keep in mind the precautions and conditions set forth in the TOSHIBA Semiconductor Reliability Handbook. 1997-08-07 1/6TOSHIBA TC74HC148AP/AF TRUTH TABLE INPUTS OUTPUTS El 0 1 2 3 4 5 6 7 A2 | A1 | AO | GS | EO H x X x X x X x x H H H H H L H H H H H H H H H H H H L L x X x X x X x L L L L L H L x Xx x Xx x Xx L H L L H L H L x X x X x L H H L H L L H L x X x X L H H H L H H L H L x X x L H H H H H L L L H L x Xx L H H H H H H L H L H L x L H H H H H H H H L L H L L H H H H H H H H H H L H X: Dont care SYSTEM DIAGRAM El 0 1 2 3 4 5 6 7 961001EBA2" @ The products described in this document are subject to foreign exchange and foreign trade control 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. 1997-08-07 2/6TOSHIBA TC74HC148AP/AF ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL VALUE UNIT *500mW in the range of Ta= supply Voltage Range Vec 0.5~7 V 5a G5 08 C. From Ta= 65C N5~ to 85C a derating factor o DC Input Voltage Vin 0.5~Vec + 0.5 V ~10mW/C shall be applied DC Output Voltage Vout 0.5~Vec + 0.5 Vv until 300mW. Input Diode Current lik +20 mA Output Diode Current lox +20 mA DC Output Current lout +25 mA DC Vec /Ground Current lee +50 mA Power Dissipation Pp 500 (DIP)* / 180 (SOP) mw Storage Temperature Tstg 65~150 a @ RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL VALUE UNIT Supply Voltage Vec 2~6 Vv Input Voltage Vin O~Vec Vv Output Voltage Vout O~Vec Vv Operating Temperature Topr 40~85 0~ 1000 (Vec = 2.0V) Input Rise and Fall Time tr, tr O~ 500(V.- =4.5V) ns O~ 400(Vc = 6.0V) DC ELECTRICAL CHARACTERISTICS Ta=25C Ta = -40~85C PARAMETER SYMBOL TEST CONDITION Vec UNIT (V) | MIN. | TYP. | MAX. | MIN. | MAX. High-Level Vis as}3is| | |aas| |v P g 6.0| 4.20] | 420] Low - Level 2.0 7 7 0.50 7 0.50 Input Voltage Vit 4.5 1.35 1.35 V P g 6.0] | 180] | 1.80 2.0] 1.9 2.0 1.9 lo=20uA | 45] 44 | 4.5 | 44 High - Level Vin= _ _ Output Voltage Vou Vin or Vit 60 | 59 | 60 > V lon =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 lor = 20uA 45/ | 0.0 | 0.1 - |01 Low - Level Vo. | Mine 6o0| |o0 |o1 | |o1 | y Output Voltage Vinor Vi, lo=4 mA 45| | 0.17 | 0.26] - | 0.33 lol =5.2mMA 6.0 _ 0.18 | 0.26 _ 0.33 Input Leakage Current lin Vin = Vcc or GND 6.0 _ _ +0.1 _ +1.0 A Quiescent Supply Current lee Vin=Vec or GND 6.0 _ _ 4.0 _ 40.0 & 1997-08-07 3/6TOSHIBA 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 . _ 4 8 THLE Propagation Delay Time toy _ 15 25 (IN AQ, Al, A2) toHL Propagation Delay Time toy _ 15 5 (INEO, GS) tout ns Propagation Delay Time toy _ 1 19 (EIEO) tout Propagation Delay Time toy _ 1 19 (EI GS) toHL Propagation Delay Time toi _ 1 19 (EI AO, A1, A2) tox AC ELECTRICAL CHARACTERISTICS ( C, = 50pF, Input t, = t;=6ns ) Ta = 25C Ta = 40~85C PARAMETER SYMBOL | TEST CONDITION VeclV)| MIN. | TYP. | MAX.| MIN. ] MAX. UNIT 20 | | 30 75 | 95 Output Transition Time t. 45 | 8 15 - 19 THL 6.0 = 7 13 = 16 Propagation Delay Time toLH 20 _ 2 130 _ 130 (INAO, Al, A2) ton 6.0 _ 15 26 _ 33 Propagation Delay Time toi ae _ 6 130 _ 138 (INEO, GS) tot 60 | | 15 | 26 | 33 | O. Propagation Delay Time toLH as _ is ae _ M0 (EI-EO) ton 6.0 | 1 20 | 25 Propagation Delay Time tou ae _ ta ae _ 0 (EIGS) tone 6.0 | 12 20 | 25 Propagation Delay Time tolH ae _ 1a Be _ M0 (EIA0, Al, A2) tot 60 | | 12 | 20 | - 25 Input Capacitance Cin _ 5 10 _ 10 F 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: lec (opr) =Cpp * Veo + fin + lec 1997-08-07 4/6TOSHIBA TC74HC148AP/AF TYPICAL APPLICATION 4 BIT CASCADE CONNECTION = 1 ~~ O a pPFR w O & O w O N O = w = No = = = Qo -p wo oO oo El EQ El EO P E0O= L WITH IN = uy? GS GS A2 A1 AO TC74HCO8 GR > de ADP 4 Oo PRIORITY FLAG A3 A2 Al AO 1997-08-07 5/6TOSHIBA TC74HC148AP/AF DIP 16PIN OUTLINE DRAWING (DIP16-P-300-2.54A ) Unit in mm Bonmnmnoons nN gOS 8 s FP wy res H 1 == 19.75MAX 19.25+0.2 0.95+0.1 0.735TYP a 1,440.1 0.520.1 Fara 25a Weight : 1.00g (Typ.) SOP 16PIN (200mil BODY) OUTLINE DRAWING ( SOP16-P-300-1.27 } Unit in mm id ad HAH 0.705TYP an - 10.25) 710.1] Weight : 0.18g (Typ.) (300mit) ww =e eT wo = 3 | 0.810.2 1997-08-07 6/6