M54HC148 M74HC148 8 TO 3 LINE PRIORITY ENCODER . . . . . . . . HIGH SPEED tPD = 15 ns (TYP.) AT VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA (MAX.) AT TA = 25 °C HIGH NOISE IMMUNITY VNIH = VNIL = 28 % VCC (MIN.) OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE IOH = IOL = 4 mA (MIN.) BALANCED PROPAGATION DELAYS tPLH = tPHL WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V PIN AND FUNCTION COMPATIBLE WITH 54/74LS148 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HC148F1R M74HC148M1R M74HC148B1R M74HC148C1R DESCRIPTION The M54/74HC148 is a high speed CMOS 8-TO-3 LINE PRIORITY ENCODER fabricated in silicon gate C2MOS technology. PIN CONNECTIONS (top view) It has the same high speed performance for LSTTL combined with true CMOS low power consumption. The M54/74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry. Data inputs are active at the low logic level. All inputs are equipped with protection circuits against static discharge and transient excess voltage. INPUT AND OUTPUT EQUIVALENT CIRCUIT NC = No Internal Connection October 1992 1/11 M54/M74HC148 TRUTH TABLE INPUTS OUTPUTS E1 H 0 X 1 X 2 X 3 X 4 X 5 X 6 X 7 X A2 H A1 H A0 H GS H E0 H L H H H H H H H H H H H H L L L X X X X X X X X X X X X X L L H L L L L L H L L H 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 L X X X L L H H H H H H H H H H H H H LL H H L L L H H L L H H H H H H H H H H L H X: Don’t Care LOGIC DIAGRAM 2/11 M54/M74HC148 PIN DESCRIPTION IEC LOGIC SYMBOL PIN No SYMBOL NAME AND FUNCTION 9, 7, 6 11, 12, 13, 1, 2, 3, 4, 10 15 A0 to A2 0 to 7 Data Outputs Data Inputs EO Enable Output 5 EI Enable Input 14 8 GS GND Priority Flag Output Ground (0V) 16 V CC Positive Supply Voltage ABSOLUTE MAXIMUM RATINGS Symbol Value Unit VCC VI Supply Voltage DC Input Voltage -0.5 to +7 -0.5 to VCC + 0.5 V V VO DC Output Voltage -0.5 to VCC + 0.5 V IIK IOK DC Input Diode Current DC Output Diode Current ± 20 ± 20 mA mA IO DC Output Source Sink Current Per Output Pin ± 25 mA ICC or IGND Parameter DC VCC or Ground Current PD Power Dissipation Tstg TL Storage Temperature Lead Temperature (10 sec) ± 50 mA 500 (*) mW -65 to +150 300 o o C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied. (*) 500 mW: ≅ 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage VI Input Voltage VO Top Output Voltage Operating Temperature: M54HC Series M74HC Series Input Rise and Fall Time tr, tf VCC = 2 V Value 2 to 6 Unit V 0 to VCC V 0 to VCC -55 to +125 -40 to +85 0 to 1000 V C o C ns VCC = 4.5 V 0 to 500 VCC = 6 V 0 to 400 o 3/11 M54/M74HC148 DC SPECIFICATIONS Test Conditions Symbol VIH V IL V OH Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage II ICC 4/11 Low Level Output Voltage Input Leakage Current Quiescent Supply Current TA = 25 C 54HC and 74HC Min. Typ. Max. VCC (V) -40 to 85 oC -55 to 125 oC 74HC 54HC Min. Max. Min. Max. 2.0 1.5 1.5 1.5 4.5 6.0 3.15 4.2 3.15 4.2 3.15 4.2 2.0 0.5 0.5 0.5 1.35 1.35 1.35 6.0 1.8 1.8 1.8 2.0 4.5 6.0 6.0 2.0 Unit V 4.5 4.5 VOL Value o VI = IO=-20 µA VIH or V IL IO=-4.0 mA 1.9 2.0 1.9 1.9 4.4 5.9 4.5 6.0 4.4 5.9 4.4 5.9 4.18 4.31 4.13 4.10 IO=-5.2 mA 5.68 5.8 0.0 5.63 0.1 0.1 0.1 V V 5.60 0.0 0.1 0.1 0.1 6.0 4.5 VI = IO= 20 µA VIH or V IL IO= 4.0 mA 0.0 0.17 0.1 0.26 0.1 0.33 0.1 0.40 6.0 IO= 5.2 mA 0.18 0.26 0.33 0.40 VI = VCC or GND ±0.1 ±1 ±1 µA VI = VCC or GND 4 40 80 µA 4.5 6.0 6.0 V M54/M74HC148 AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns) Test Conditions Symbol Parameter tTLH tTHL Output Transition Time tPLH tPHL Propagation Delay Time (In - A0, A1, A2) tPLH tPHL Propagation Delay Time (In - EO, GS) tPLH tPHL Propagation Delay Time (EI - EO) tPLH tPHL Propagation Delay Time (EI - GS) tPLH tPHL Propagation Delay Time (EI - A0, A1, A2) CIN CPD (*) Value o VCC (V) TA = 25 C 54HC and 74HC Min. Typ. Max. -40 to 85 oC -55 to 125 oC 74HC 54HC Min. Max. Min. Max. 2.0 30 75 95 110 4.5 6.0 8 7 15 13 19 16 22 19 2.0 60 150 190 225 4.5 19 30 38 45 6.0 16 26 32 38 2.0 60 150 190 225 4.5 6.0 19 16 30 26 38 32 45 38 2.0 40 115 145 175 4.5 6.0 14 12 23 20 29 25 35 30 Unit ns ns ns ns 2.0 40 115 145 175 4.5 6.0 14 12 23 20 29 25 35 30 2.0 40 115 145 175 4.5 6.0 14 12 23 20 29 25 35 30 ns Input Capacitance 5 10 10 10 pF Power Dissipation Capacitance 60 ns pF (*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN + ICC SWITCHING CHARACTERISTICS TEST CIRCUIT TEST CIRCUIT ICC (Opr.) INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF SWITCHING CHARACTERISTICS TEST. 5/11 M54/M74HC148 TYPICAL APPLICATION 4-BIT CASCADE CONNECTION 6/11 M54/M74HC148 Plastic DIP16 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.050 P001C 7/11 M54/M74HC148 Ceramic DIP16/1 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 20 0.787 B 7 0.276 D E 3.3 0.130 0.38 e3 0.015 17.78 0.700 F 2.29 2.79 0.090 0.110 G 0.4 0.55 0.016 0.022 H 1.17 1.52 0.046 0.060 L 0.22 0.31 0.009 0.012 M 0.51 1.27 0.020 0.050 N P Q 10.3 7.8 8.05 5.08 0.406 0.307 0.317 0.200 P053D 8/11 M54/M74HC148 SO16 (Narrow) MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.004 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45° (typ.) D 9.8 E 5.8 10 0.385 6.2 0.228 0.393 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8° (max.) P013H 9/11 M54/M74HC148 PLCC20 MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 9.78 10.03 0.385 0.395 B 8.89 9.04 0.350 0.356 D 4.2 4.57 0.165 0.180 d1 2.54 0.100 d2 0.56 0.022 E 7.37 8.38 0.290 0.330 e 1.27 0.050 e3 5.08 0.200 F 0.38 0.015 G 0.101 0.004 M 1.27 0.050 M1 1.14 0.045 P027A 10/11 M54/M74HC148 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A 11/11