SN74ALS280, SN74AS280 9-BIT PARITY GENERATORS/CHECKERS SDAS038C – DECEMBER 1982 – REVISED DECEMBER 1994 • • • • D OR N PACKAGE (TOP VIEW) Generate Either Odd or Even Parity for Nine Data Lines Cascadable for n-Bit Parity Can Be Used to Upgrade Existing Systems Using MSI Parity Circuits Package Options Include Plastic Small-Outline (D) Packages and Standard Plastic (N) 300-mil DIPs G H NC I Σ EVEN Σ ODD GND description 1 14 2 13 3 12 4 11 5 10 6 9 7 8 VCC F E D C B A NC – No internal connection These universal 9-bit parity generators/checkers utilize advanced Schottky high-performance circuitry and feature odd (Σ ODD) and even (Σ EVEN) outputs to facilitate operation of either odd- or even-parity applications. The word-length capability is easily expanded by cascading. These devices can be used to upgrade the performance of most systems utilizing the SN74ALS180 and SN74AS180 parity generators/checkers. Although the SN74ALS280 and SN74AS280 are implemented without expander inputs, the corresponding function is provided by the availability of an input (I) at terminal 4 and the absence of any internal connection at terminal 3. This permits the SN74ALS280 and SN74AS280 to be substituted for the SN74ALS180 and SN74AS180 in existing designs to produce an identical function even if the devices are mixed with existing SN74ALS180 and SN74AS180 devices. All SN74AS280 inputs are buffered to lower the drive requirements. The SN74ALS280 and SN74AS280 are characterized for operation from 0°C to 70°C. FUNCTION TABLE NO. OF INPUTS A–I THAT ARE HIGH Σ EVEN 0, 2, 4, 6, 8 H L 1, 3, 5, 7, 9 L H OUTPUTS Σ ODD logic symbol† A B C D E F G H I 8 2k 9 10 5 11 Σ EVEN 12 13 6 Σ ODD 1 2 4 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Copyright 1994, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN74ALS280, SN74AS280 9-BIT PARITY GENERATORS/CHECKERS SDAS038C – DECEMBER 1982 – REVISED DECEMBER 1994 logic diagram (positive logic) A B C D E F G H I 8 9 10 5 Σ EVEN 6 Σ ODD 11 12 13 1 2 4 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Operating free-air temperature range, TA: SN74ALS280 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74ALS280, SN74AS280 9-BIT PARITY GENERATORS/CHECKERS SDAS038C – DECEMBER 1982 – REVISED DECEMBER 1994 recommended operating conditions SN74ALS280 MIN NOM MAX 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IOH Low-level input voltage High-level output current – 2.6 mA IOL TA Low-level output current 24 mA 70 °C High-level input voltage 2 V 0.8 Operating free-air temperature V 0 V electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH SN74ALS280 TYP† MAX TEST CONDITIONS MIN VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 0.4 mA VCC = 4.5 V, IOH = – 2.6 mA IOL = 12 mA VOL VCC = 4 4.5 5V II IIH VCC = 5.5 V, VCC = 5.5 V, IIL IO‡ VCC = 5.5 V, VCC = 5.5 V, – 1.5 VCC – 2 2.4 IOL = 24 mA VI = 7 V VO = 2.25 V – 30 V V 3.3 0.25 0.4 0.35 0.5 0.1 VI = 2.7 V VI = 0.4 V UNIT V mA 20 µA – 0.1 mA – 112 mA ICC VCC = 5.5 V 10 16 mA † All typical values are at VCC = 5 V, TA = 25°C. ‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL Any Σ EVEN tPLH tPHL Any Σ ODD VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX§ SN74ALS280 MIN MAX 3 20 3 20 3 20 4 22 UNIT ns ns § For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN74ALS280, SN74AS280 9-BIT PARITY GENERATORS/CHECKERS SDAS038C – DECEMBER 1982 – REVISED DECEMBER 1994 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Operating free-air temperature range, TA: SN74AS280 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. recommended operating conditions SN74AS280 MIN NOM MAX 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IOH Low-level input voltage 0.8 V High-level output current –2 mA IOL TA Low-level output current 20 mA 70 °C High-level input voltage 2 Operating free-air temperature V V 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER SN74AS280 TYP‡ MAX TEST CONDITIONS MIN VIK VOH VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 2 mA VOL II VCC = 4.5 V, VCC = 5.5 V, IOL = 20 mA VI = 7 V IIH IIL IO§ VCC = 5.5 V, VCC = 5.5 V, VI = 2.7 V VI = 0.4 V – 1.5 VCC – 2 UNIT V V 0.35 0.5 V 0.1 mA 20 µA – 0.5 mA VCC = 5.5 V, VO = 2.25 V – 30 – 112 mA ICC VCC = 5.5 V 25 35 mA ‡ All typical values are at VCC = 5 V, TA = 25°C. § The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX¶ UNIT SN74AS280 tPLH tPHL Any Σ EVEN tPLH tPHL Any Σ ODD MIN MAX 3 12 3 11 3 12 3 11.5 ¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 ns ns SN74ALS280, SN74AS280 9-BIT PARITY GENERATORS/CHECKERS SDAS038C – DECEMBER 1982 – REVISED DECEMBER 1994 APPLICATION INFORMATION 25-LINE PARITY GENERATOR/CHECKER 81-LINE PARITY GENERATOR/CHECKER A B C A B C Σ EVEN D D E F E F G Σ ODD G H I H I A A B C B C Σ EVEN D H - Even L = Odd E F G Σ ODD H I H - Odd L = Even D E F G G H I H I A B C D D E F E F Σ ODD G H I H I Three SN74ALS280/SN74AS280 devices can be used to implement a 25-line parity generator/ checker. B C E F B C Σ EVEN A Σ ODD D A G Σ ODD Σ EVEN H - Even L = Odd Σ ODD H - Odd L = Even Σ ODD To Other SN74AS280s Longer word lengths can be implemented by cascading SN74ALS280/SN74AS280 devices. Parity can be generated for word lengths up to 81 bits. As an alternative, the Σ ODD outputs of two or three parity generators/checkers can be decoded with a 2-input (′AS86A or ′ALS86) exclusive-OR gate for 18- or 27-line parity applications. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN74ALS280, SN74AS280 9-BIT PARITY GENERATORS/CHECKERS SDAS038C – DECEMBER 1982 – REVISED DECEMBER 1994 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2 VCC S1 RL R1 Test Point From Output Under Test CL (see Note A) From Output Under Test RL Test Point From Output Under Test CL (see Note A) CL (see Note A) LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS 3.5 V Timing Input Test Point LOAD CIRCUIT FOR 3-STATE OUTPUTS 3.5 V High-Level Pulse 1.3 V R2 1.3 V 1.3 V 0.3 V 0.3 V Data Input tw th tsu 3.5 V 1.3 V 3.5 V Low-Level Pulse 1.3 V 0.3 V 1.3 V 0.3 V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES VOLTAGE WAVEFORMS PULSE DURATIONS 3.5 V Output Control (low-level enabling) 1.3 V 1.3 V 0.3 V tPZL Waveform 1 S1 Closed (see Note B) tPLZ [3.5 V 1.3 V tPHZ tPZH Waveform 2 S1 Open (see Note B) 1.3 V VOL 0.3 V VOH 1.3 V 0.3 V [0 V 3.5 V 1.3 V Input 1.3 V 0.3 V tPHL tPLH VOH In-Phase Output 1.3 V 1.3 V VOL tPLH tPHL VOH Out-of-Phase Output (see Note C) 1.3 V 1.3 V VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. When measuring propagation delay items of 3-state outputs, switch S1 is open. D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%. E. The outputs are measured one at a time with one transition per measurement. Figure 1. Load Circuits and Voltage Waveforms 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PACKAGE OPTION ADDENDUM www.ti.com 8-Aug-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty SN74ALS280D ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74ALS280DE4 ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74ALS280DR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74ALS280DRE4 ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74ALS280N ACTIVE PDIP N 14 CU NIPDAU Level-NC-NC-NC SN74ALS280N3 OBSOLETE PDIP N 14 SN74AS280D ACTIVE SOIC D SN74AS280DE4 ACTIVE SOIC SN74AS280DR ACTIVE SN74AS280DRE4 Lead/Ball Finish MSL Peak Temp (3) 25 Pb-Free (RoHS) TBD Call TI 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM D 14 50 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74AS280N ACTIVE PDIP N 14 Pb-Free (RoHS) CU NIPDAU Level-NC-NC-NC SN74AS280N3 OBSOLETE PDIP N 14 TBD Call TI SN74AS280NSR ACTIVE SO NS 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74AS280NSRE4 ACTIVE SO NS 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM 25 Call TI Call TI (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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