 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| 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. GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current - High Output Current - Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 -0.4 8.0 Unit V C mA mA http://onsemi.com LOW POWER SCHOTTKY 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Device SN74LS147N SN74LS147D SN74LS147DR2 SN74LS148N SN74LS148D SN74LS148DR2 Package 16 Pin DIP SOIC-16 SOIC-16 16 Pin DIP SOIC-16 SOIC-16 Shipping 2000 Units/Box 38 Units/Rail 2500/Tape & Reel 2000 Units/Box 38 Units/Rail 2500/Tape & Reel (c) Semiconductor Components Industries, LLC, 2001 1 October, 2001 - Rev. 7 Publication Order Number: SN74LS147/D SN74LS147, SN74LS148 SN74LS147 (TOP VIEW) OUTPUT VCC 16 NC 15 D 14 D 4 5 1 4 2 5 6 3 6 INPUTS 7 4 7 8 5 8 C 6 C B 7 B 8 GND 3 13 3 INPUTS 2 12 2 1 11 1 9 10 9 A OUTPUT A 9 OUTPUTS SN74LS148 (TOP VIEW) OUTPUTS VCC 16 EO 15 EO 4 5 1 4 2 5 6 3 6 INPUTS 7 4 7 EI 5 E1 A2 6 A2 GS 14 GS 3 13 3 INPUTS 2 12 2 1 11 1 0 10 0 A0 A1 7 A1 8 GND OUTPUT A0 9 OUTPUTS http://onsemi.com 2 SN74LS147, SN74LS148 SN74LS147 FUNCTION TABLE INPUTS 1 H X X X X X X X X L 2 H X X X X X X X L H 3 H X X X X X X L H H 4 H X X X X X L H H H 5 H X X X X L H H H H 6 H X X X L H H H H H 7 H X X L H H H H H H 8 H X L H H H H H H H 9 H L H H H H H H H H D H L L H H H H H H H OUTPUTS C H H H L L L L H H H B H H H L L H H L L H A H L H L H L H L H L EI H L L L L L L L L L 0 X H X X X X X X X L 1 X H X X X X X X L H 2 X H X X X X X L H H 3 X H X X X X L H H H SN74LS148 FUNCTION TABLE INPUTS 4 X H X X X L H H H H 5 X H X X L H H H H H 6 X H X L H H H H H H 7 X H L H H H H H H H A2 H H L L L L H H H H OUTPUTS A1 H H L L H H L L H H A0 H H L H L H L H L H GS H H L L L L L L L L EO H L H H H H H H H H H = HIGH Logic Level, L = LOW Logic Level, X = Irrelevant FUNCTIONAL BLOCK DIAGRAMS 1 (11) 0 (12) (9) (13) 2 (1) 3 (2) (7) B 4 (3) 5 (4) (6) A 1 (10) (15) (11) (14) EO GS 2 3 (12) (8) (13) (1) (7) A0 4 5 6 7 (2) A1 (3) C 6 (4) 7 (6) 8 9 (5) (10) (14) A2 D (5) EI SN74LS147 SN74LS148 http://onsemi.com 3 SN74LS147, SN74LS148 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 2.7 -0.65 3.5 0.25 VOL Output LOW Voltage 0.35 Input HIGH Current All Others Inputs 1-7 (LS148) All Others Inputs 1-7 (LS148) IIL IOS ICCH ICCL Input LOW Current All Others Inputs 1-7 (LS148) Short Circuit Current (Note 1) Power Supply Current Output HIGH Output LOW -20 0.5 20 40 0.1 0.2 -0.4 -0.8 -100 17 20 V A 0.4 Min 2.0 0.8 -1.5 Typ Max Unit V V V V V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = -18 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VIN = 2.7 V IIH mA VCC = MAX, VIN = 7.0 V mA mA mA mA VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX, All Inputs = 4.5 V VCC = MAX, Inputs 7 & E1 = GND All Other Inputs = 4.5 V 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 = 25C) SN74LS147 Symbol tPLH tPHL tPLH tPHL Any Any From (Input) Any To (Output) Any Limits Waveform In hase In-phase output Out of hase Out-of-phase output Min Typ 12 12 21 15 Max 18 ns 18 33 ns 23 CL = 15 pF, F, RL = 2.0 k Unit Test Conditions SN74LS148 Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL EI EO EI GS EI A0, A1 A0 A1, or A2 0 thru 7 GS 0 thru 7 EO 1 thru 7 A0, A1 A0 A1, or A2 From (Input) 1 thru 7 To (Output) A0, A1 A0 A1, or A2 Limits Waveform In hase In-phase output Out of hase Out-of-phase output Out of hase Out-of-phase output In-phase In hase output In hase In-phase output In hase In-phase output In-phase In phase output Min Typ 14 15 20 16 7.0 25 35 9.0 16 12 12 14 12 28 30 Max 18 ns 25 36 ns 29 18 ns 40 55 ns 21 25 ns 25 17 ns 36 21 40 45 ns (LS148) CL = 15 pF, RL = 2.0 k Unit Test Conditions http://onsemi.com 5 SN74LS147, SN74LS148 PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 648-08 ISSUE R -A- 16 9 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. 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 B 1 8 F S C L -T- H G D 16 PL SEATING PLANE K J TA M M 0.25 (0.010) M http://onsemi.com 6 SN74LS147, SN74LS148 PACKAGE DIMENSIONS D SUFFIX PLASTIC SOIC PACKAGE CASE 751B-05 ISSUE J -A- 16 9 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. 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 -B- 1 8 P 8 PL 0.25 (0.010) M B S G F K C -T- SEATING PLANE R X 45 _ M D 16 PL M J 0.25 (0.010) TB S A S http://onsemi.com 7 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. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-0031 Phone: 81-3-5740-2700 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. http://onsemi.com 8 SN74LS147/D |
Price & Availability of SN74LS147-D
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |