SN54/74LS280 9-BIT ODD/EVEN PARITY GENERATORS/CHECKERS The SN54/ 74LS280 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. * * * * * 9-BIT ODD/ EVEN PARITY GENERATORS/ CHECKERS 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 J SUFFIX CERAMIC CASE 632-08 14 1 INPUTS VCC F E D C B A 14 13 12 11 10 9 8 F E D C G H 1 G 2 H INPUTS I 3 NC 14 B 1 A N SUFFIX PLASTIC CASE 646-06 EVEN ODD 14 4 5 6 7 GND I INPUT EVEN ODD 1 D SUFFIX SOIC CASE 751A-02 OUTPUTS ORDERING INFORMATION FUNCTION TABLE NUMBER OF INPUTS A THRU 1 THAT ARE HIGH SN54LSXXXJ SN74LSXXXN SN74LSXXXD OUTPUTS EVEN ODD H L L H 0, 2, 4, 6, 8 1, 3, 5, 7, 9 Ceramic Plastic SOIC H = HIGH Level, L = LOW Level GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 - 55 0 25 25 125 70 C IOH Output Current -- High 54, 74 - 0.4 mA IOL Output Current -- Low 54 74 4.0 8.0 mA FAST AND LS TTL DATA 5-456 SN54/74LS280 FUNCTIONAL BLOCK DIAGRAM A B C (8) (9) (10) (5) EVEN D E F (11) (12) (13) (6) ODD G H I (1) (2) (4) DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH Current IIL Input LOW Current IOS Short Circuit Current (Note 1) ICC Power Supply Current Typ Max Unit 2.0 54 0.7 74 0.8 - 0.65 - 1.5 Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = - 18 mA 54 2.5 3.5 V 74 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table 54, 74 0.25 0.4 V IOL = 4.0 mA 74 0.35 0.5 V IOL = 8.0 mA - 20 VCC = VCC MIN, VIN = VIL or VIH per Truth Table 20 A 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 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits Symbol Parameter Min Typ Max Unit tPLH tPHL Propagation Delay, Data to Output EVEN 33 29 50 45 ns tPLH tPHL Propagation Delay, Data to Output ODD 23 31 35 50 ns FAST AND LS TTL DATA 5-457 Test Conditions CL = 15 pF Case 751A-02 D Suffix 14-Pin Plastic SO-14 "! !! ( ( ! " " ! " # %# (" ! "# !# -A- 8 P -B1 ! #! " #! ! * ! !" $ !" M J F R X 45 K D " ! ! " * C G " 7 & 14 "#! ! ! ! ) ) ) ) Case 632-08 J Suffix 14-Pin Ceramic Dual In-Line -A- "! ! " ! & 14 8 " ! " " -B1 ! 7 * " -T- L G J " ! & # * !" $ !" " M N D ! " * K F $ " $ " " C $ & ! ! ! ! ! ) ) ) ) Case 646-06 N Suffix 14-Pin Plastic "! 14 " B 1 A ! ( ! " # # F L C J N K M FAST AND LS TTL DATA 5-458 ! " * !" $ !" D ! $ ! H #! " " ! ( " " 7 G ! $" '' !" " !" " %# 8 * ! ! ! ! # Motorola reserves the right to make changes without further notice to any products herein. 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ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. FAST AND LS TTL DATA 5-459