SN74LS280 9-Bit Odd/Even Parity Generators/Checkers The SN74LS280 is a Universal 9-Bit Parity Generator / Checker. It features odd / even outputs to facilitate either odd or even parity. By cascading, the word length is easily expanded. The LS280 is designed without the expander input implementation, but the corresponding function is provided by an input at Pin 4 and the absence of any connection at Pin 3. This design permits the LS280 to be substituted for the LS180 which results in improved performance. The LS280 has buffered inputs to lower the drive requirements to one LS unit load. • • • • • http://onsemi.com LOW POWER SCHOTTKY Generates Either Odd or Even Parity for Nine Data Lines Typical Data-to-Output Delay of only 33 ns Cascadable for n-Bits Can Be Used To Upgrade Systems Using MSI Parity Circuits Typical Power Dissipation = 80 mW 14 1 INPUTS VCC F E D C B A 14 13 12 11 10 9 8 F E D C B G H I PLASTIC N SUFFIX CASE 646 A ∑ ∑ EVEN ODD 14 1 1 G 2 H 3 NC 4 5 6 7 I ∑ ∑ GND INPUT EVEN ODD SOIC D SUFFIX CASE 751A INPUTS OUTPUTS FUNCTION TABLE OUTPUTS NUMBER OF INPUTS A THRU 1 THAT ARE HIGH 0, 2, 4, 6, 8 1, 3, 5, 7, 9 ∑EVEN ∑ODD H L L H ORDERING INFORMATION H = HIGH Level, L = LOW Level GUARANTEED OPERATING RANGES Symbol VCC Parameter Supply Voltage 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 Semiconductor Components Industries, LLC, 1999 December, 1999 – Rev. 6 1 Device Package Shipping SN74LS280N 14 Pin DIP 2000 Units/Box SN74LS280D 14 Pin 2500/Tape & Reel Publication Order Number: SN74LS280/D SN74LS280 FUNCTIONAL BLOCK DIAGRAM A (8) B (9) C (10) D E F (5) ∑ EVEN (11) (12) (13) (6) ∑ ODD G H (1) (2) I (4) 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 Input HIGH Current IIL Input LOW Current IOS Short Circuit Current (Note 1) ICC Power Supply Current 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 20 µA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V – 0.4 mA VCC = MAX, VIN = 0.4 V – 100 mA VCC = MAX 27 mA VCC = MAX – 20 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) Limits Symbol Parameter Min Typ Max Unit tPLH tPHL Propagation Delay, Data to Output ΣEVEN 33 29 50 45 ns tPLH tPHL Propagation Delay, Data to Output ΣODD 23 31 35 50 ns http://onsemi.com 2 Test Conditions CL = 15 pF SN74LS280 PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 646–06 ISSUE M 14 8 1 7 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. B A F DIM A B C D F G H J K L M N L N C –T– SEATING PLANE J K H D 14 PL G M 0.13 (0.005) 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. –A– 8 –B– 1 P 7 PL 0.25 (0.010) 7 G M B M R X 45 _ C F –T– SEATING PLANE D 14 PL 0.25 (0.010) T B J M K M S A MILLIMETERS MIN MAX 18.16 18.80 6.10 6.60 3.69 4.69 0.38 0.53 1.02 1.78 2.54 BSC 1.32 2.41 0.20 0.38 2.92 3.43 7.37 7.87 ––– 10_ 0.38 1.01 M D SUFFIX PLASTIC SOIC PACKAGE CASE 751A–03 ISSUE F 14 INCHES MIN MAX 0.715 0.770 0.240 0.260 0.145 0.185 0.015 0.021 0.040 0.070 0.100 BSC 0.052 0.095 0.008 0.015 0.115 0.135 0.290 0.310 ––– 10_ 0.015 0.039 S http://onsemi.com 3 DIM A B C D F G J K M P R MILLIMETERS MIN MAX 8.55 8.75 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 0.337 0.344 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_ 0.228 0.244 0.010 0.019 SN74LS280 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). 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