M54HC148 RAD-HARD 8 TO 3 LINE PRIORITY ENCODER ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 16ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: ICC = 4µA(MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 54 SERIES 148 SPACE GRADE-1: ESA SCC QUALIFIED 50 krad QUALIFIED, 100 krad AVAILABLE ON REQUEST NO SEL UNDER HIGH LET HEAVY IONS IRRADIATION DEVICE FULLY COMPLIANT WITH SCC-9410-017 DESCRIPTION The M54HC148 is an high speed CMOS 8 TO 3 LINE PRIORITY ENCODER fabricated with silicon gate C2MOS technology. DILC-16 FPC-16 ORDER CODES PACKAGE FM EM DILC FPC M54HC148D M54HC148K M54HC148D1 M54HC148K1 The M54HC148 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. PIN CONNECTION March 2004 1/10 M54HC148 IEC LOGIC SYMBOLS INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN N° SYMBOL 9, 7, 6 A0 to A2 0 to 7 10, 11, 12, 13, 1, 2, 3, 4 15 5 14 8 16 NAME AND FUNCTION Data Outputs Data Inputs EO EI GS GND VCC Enable Output Enable Input Priority Flag Output Ground (0V) Positive Supply Voltage TRUTH TABLE INPUTS OUTPUTS E1 0 1 2 3 4 5 6 7 A2 A1 A0 GS E0 H L L L L L L L L L X H X X X X X X X L X H X X X X X X L H X H X X X X X L H H X H X X X X L H H H X H X X X L H H H H X H X X L H H H H H X H X L H H H H H H X H L H H H H H H H H H L L L L H H H H H H L L H H L L H H H H L H L H L H L H H H L L L L L L L L H L H H H H H H H H X : Don’t Care 2/10 M54HC148 LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage Value Unit -0.5 to +7 V -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 V DC Input Diode Current ± 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 25 mA ± 50 mA VI DC Input Voltage VO DC Output Voltage IIK ICC or IGND DC VCC or Ground Current PD Power Dissipation Tstg Storage Temperature TL Lead Temperature (10 sec) V 300 mW -65 to +150 °C 265 °C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied 3/10 M54HC148 RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage VI Input Voltage VO Output Voltage Top Operating Temperature Input Rise and Fall Time tr, tf Value Unit 2 to 6 V 0 to VCC V 0 to VCC V -55 to 125 °C VCC = 2.0V 0 to 1000 ns VCC = 4.5V 0 to 500 ns VCC = 6.0V 0 to 400 ns DC SPECIFICATIONS Test Condition Symbol VIH VIL VOH VOL II ICC 4/10 Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Input Leakage Current Quiescent Supply Current Value TA = 25°C VCC (V) Min. 2.0 4.5 6.0 2.0 4.5 6.0 Typ. Max. 1.5 3.15 4.2 -40 to 85°C -55 to 125°C Min. Min. Max. 1.5 3.15 4.2 0.5 1.35 1.8 Max. 1.5 3.15 4.2 0.5 1.35 1.8 V 0.5 1.35 1.8 2.0 IO=-20 µA 1.9 2.0 1.9 1.9 4.5 IO=-20 µA 4.4 4.5 4.4 4.4 6.0 IO=-20 µA 5.9 6.0 5.9 5.9 4.5 IO=-4.0 mA 4.18 4.31 4.13 4.10 5.68 Unit V V 6.0 IO=-5.2 mA 2.0 IO=20 µA 0.0 0.1 0.1 0.1 4.5 IO=20 µA 0.0 0.1 0.1 0.1 6.0 IO=20 µA 0.0 0.1 0.1 0.1 4.5 IO=4.0 mA 0.17 0.26 0.33 0.40 6.0 IO=5.2 mA 0.18 0.26 0.33 0.40 6.0 VI = VCC or GND ± 0.1 ±1 ±1 µA 6.0 VI = VCC or GND 4 40 80 µA 5.8 5.63 5.60 V M54HC148 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns) Test Condition 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) Value TA = 25°C VCC (V) Min. 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 Typ. Max. 30 8 7 60 19 16 60 19 16 40 14 12 40 14 12 40 14 12 75 15 13 150 30 26 150 30 26 115 23 20 115 23 20 115 23 20 -40 to 85°C -55 to 125°C Min. Min. Max. 95 19 16 190 38 32 190 38 32 145 29 25 145 29 25 145 29 25 Unit Max. 110 22 19 225 45 38 225 45 38 175 35 30 175 35 30 175 35 30 ns ns ns ns ns ns CAPACITIVE CHARACTERISTICS Test Condition Symbol Parameter VCC (V) Value TA = 25°C Min. Typ. Max. 10 CIN Input Capacitance 5.0 5 CPD Power Dissipation Capacitance (note 1) 5.0 60 -40 to 85°C -55 to 125°C Min. Min. Max. 10 Unit Max. 10 pF pF 1) 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 operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC 5/10 M54HC148 TEST CIRCUIT CL = 50pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50Ω) WAVEFORM 1: PROPAGATION DELAY TIMES,FOR INVERTING AND NON INVERTING OUTPUTS (f=1MHz; 50% duty cycle) 6/10 M54HC148 TYPICAL APPLICATION 7/10 M54HC148 DILC-16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 2.1 2.71 0.083 0.107 a1 3.00 3.70 0.118 0.146 a2 0.63 1.14 0.025 B 1.82 2.39 0.072 b 0.40 0.45 0.50 0.016 0.018 0.020 b1 0.20 0.254 0.30 0.008 0.010 0.012 D 20.06 20.32 20.58 0.790 0.800 0.810 e 7.36 7.62 7.87 0.290 0.300 0.310 e1 0.88 2.54 0.035 0.045 0.094 0.100 e2 17.65 17.78 17.90 0.695 0.700 0.705 e3 7.62 7.87 8.12 0.300 0.310 0.320 F 7.29 7.49 7.70 0.287 0.295 0.303 I 3.83 0.151 K 10.90 12.1 0.429 0.476 L 1.14 1.5 0.045 0.059 0056437F 8/10 M54HC148 FPC-16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 6.75 6.91 7.06 0.266 0.272 0.278 B 9.76 9.94 10.14 0.384 0.392 0.399 C 1.49 1.95 0.059 D 0.102 0.127 0.152 0.004 0.005 0.006 E 8.76 8.89 9.01 0.345 0.350 0.355 F 0.077 1.27 G 0.38 H 6.0 L 18.75 M 0.33 0.050 0.43 0.48 0.015 0.017 0.019 0.237 0.38 N 22.0 0.738 0.43 0.013 0.867 0.015 4.31 0.017 0.170 G F D H 9 16 A N L 8 1 H E B M C 0016030E 9/10 M54HC148 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. 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