SN74LS147 SN74LS148 10-Line-to-4-Line and 8-Line-to-3-Line Priority Encoders The SN74LS147 and the SN74LS148 are Priority Encoders. They provide priority decoding of the inputs to ensure that only the highest order data line is encoded. Both devices have data inputs and outputs which are active at the low logic level. The LS147 encodes nine data lines to four-line (8-4-2-1) BCD. The implied decimal zero condition does not require an input condition because zero is encoded when all nine data lines are at a high logic level. The LS148 encodes eight data lines to three-line (4-2-1) binary (octal). By providing cascading circuitry (Enable Input EI and Enable Output EO) octal expansion is allowed without needing external circuitry. http://onsemi.com LOW POWER SCHOTTKY GUARANTEED OPERATING RANGES Symbol VCC Parameter Supply Voltage 16 Min Typ Max Unit 4.75 5.0 5.25 V 0 25 70 °C TA Operating Ambient Temperature Range IOH Output Current – High – 0.4 mA IOL Output Current – Low 8.0 mA 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Semiconductor Components Industries, LLC, 1999 December, 1999 – Rev. 6 1 Device Package Shipping SN74LS147N 16 Pin DIP 2000 Units/Box SN74LS147D 16 Pin 2500/Tape & Reel SN74LS148N 16 Pin DIP 2000 Units/Box SN74LS148D 16 Pin 2500/Tape & Reel Publication Order Number: SN74LS147/D SN74LS147 SN74LS148 SN74LS147 (TOP VIEW) OUTPUT INPUTS OUTPUT VCC NC D 3 2 1 9 A 16 15 14 13 12 11 10 9 D 3 2 1 9 5 6 7 8 C B 2 5 3 6 4 7 5 8 6 C 7 B 4 1 4 A INPUTS 8 GND OUTPUTS SN74LS148 (TOP VIEW) OUTPUTS INPUTS OUTPUT VCC EO GS 3 2 1 0 A0 16 15 14 13 12 11 10 9 EO GS 3 2 1 0 5 6 7 EI A2 A1 2 5 3 6 4 7 5 E1 6 A2 7 A1 4 1 4 A0 INPUTS OUTPUTS http://onsemi.com 2 8 GND SN74LS147 SN74LS148 SN74LS147 FUNCTION TABLE SN74LS148 FUNCTION TABLE INPUTS OUTPUTS INPUTS OUTPUTS 1 2 3 4 5 6 7 8 9 D C B A EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO H X X X X X X X X L H X X X X X X X L H H X X X X X X L H H H X X X X X L H H H H X X X X L H H H H H X X X L H H H H H H X X L H H H H H H H X L H H H H H H H H L H H H H H H H H H L L H 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 L H L H L H L H L 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 H = HIGH Logic Level, L = LOW Logic Level, X = Irrelevant FUNCTIONAL BLOCK DIAGRAMS 1 2 3 4 5 6 7 8 9 (11) 0 (12) (9) (10) (15) (11) (14) 1 A (13) EO GS (12) 2 (1) (8) (13) A0 3 (7) (2) (1) B 4 (7) (2) (3) 5 (4) (6) (3) 6 C (4) (5) (6) 7 (14) (10) A1 (5) D EI SN74LS147 SN74LS148 http://onsemi.com 3 A2 SN74LS147 SN74LS148 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL O Output LOW Voltage IIH Min Typ Max 2.0 0.8 – 0.65 2.7 – 1.5 3.5 Unit Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = – 18 mA V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VCC = VCC MIN, VIN = VIL or VIH per Truth Table 0.25 0.4 V IOL = 4.0 mA 0.35 0.5 V IOL = 8.0 mA Input HIGH Current All Others Inputs 1 – 7 (LS148) 20 40 µA VCC = MAX, VIN = 2.7 V All Others Inputs 1 – 7 (LS148) 0.1 0.2 mA VCC = MAX, VIN = 7.0 V – 0.4 – 0.8 mA VCC = MAX, VIN = 0.4 V – 100 mA VCC = MAX IIL Input LOW Current All Others Inputs 1 – 7 (LS148) IOS Short Circuit Current (Note 1) ICCH Power Supply Current Output HIGH 17 mA VCC = MAX, All Inputs = 4.5 V ICCL Output LOW 20 mA VCC = MAX, Inputs 7 & E1 = GND All Other Inputs = 4.5 V – 20 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. http://onsemi.com 4 SN74LS147 SN74LS148 AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C) SN74LS147 Symbol tPLH From (Input) To (Output) Any Any tPHL tPLH Any Any tPHL Limits Waveform Min Typ Max In-phase output 12 18 12 18 Out-of-phase output 21 33 15 23 Unit Test Conditions ns CL = 15 pF, RL = 2.0 kΩ ns SN74LS148 Symbol tPLH From (Input) 1 thru 7 To (Output) A0 A1 A0, A1, or A2 tPHL tPLH 1 thru 7 A0 A1 A0, A1, or A2 tPHL tPLH 0 thru 7 EO tPHL tPLH 0 thru 7 GS tPHL tPLH EI A0 A1 A0, A1, or A2 tPHL tPLH EI GS tPHL tPLH tPHL EI EO Limits Waveform Min Typ Max In-phase output 14 18 15 25 Out-of-phase output 20 36 16 29 Out-of-phase output 7.0 18 25 40 In-phase output 35 55 Unit Test Conditions ns ns ns ns 9.0 21 In-phase output 16 25 12 25 In-phase output 12 17 14 36 12 21 28 30 40 45 CL = 15 pF, F RL = 2.0 kΩ ns ns In- hase In-phase output http://onsemi.com 5 ns (LS148) SN74LS147 SN74LS148 PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. –A– 16 9 1 8 B F C L S –T– SEATING PLANE K H G D M J 16 PL 0.25 (0.010) M T A M http://onsemi.com 6 DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01 SN74LS147 SN74LS148 PACKAGE DIMENSIONS D SUFFIX PLASTIC SOIC PACKAGE CASE 751B–05 ISSUE J –A– 16 9 1 8 –B– P NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 8 PL 0.25 (0.010) M B S G R K F X 45 _ C –T– SEATING PLANE J M D 16 PL 0.25 (0.010) M T B S A S http://onsemi.com 7 DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019 SN74LS147 SN74LS148 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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