SCBS003C − SEPTEMBER 1987 − REVISED NOVEMBER 1993 • • • • • • • • DW OR NT PACKAGE (TOP VIEW) BiCMOS Process With TTL Inputs and Outputs BiCMOS Design Reduces Standby Current Flow-Through Pinout (All Inputs on Opposite Side From Outputs) Functionally Equivalent to SN74ALS29833 and AMD Am29833 High-Speed Bus Transceiver With Parity Generator/ Checker Parity-Error Flag With Open-Collector Output Available Register For Storage of the Parity-Error Flag Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic 300-mil DIPs (NT) OEA A1 A2 A3 A4 A5 A6 A7 A8 ERR CLR GND 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 16 10 15 11 14 12 13 VCC B1 B2 B3 B4 B5 B6 B7 B8 PARITY OEB CLK description The SN74BCT29833 is an 8-bit to 9-bit parity transceiver designed for asynchronous communication between data buses. When data is transmitted from the A to B bus, a parity bit is generated. When data is transmitted from the B to A bus with its corresponding parity bit, the parity-error (ERR) output will indicate whether or not an error in the B data has occurred. The output-enable (OEA, OEB) inputs can be used to disable the device so that the buses are effectively isolated. A 9-bit parity generator/ checker generates a parity-odd (PARITY) output and monitors the parity of the I/O ports with an open-collector parity-error (ERR) flag. ERR is clocked into the register on the rising edge of the CLK input. The error flag register is cleared with a low pulse on the clear (CLR) input. When both OEA and OEB are low, data is transferred from the A bus to the B bus and inverted parity is generated. Inverted parity is a forced error condition which gives the designer more system diagnostic capability. The SN74BCT29833 provides true logic. The SN74BCT29833 is characterized for operation from 0°C to 70°C. FUNCTION TABLE INPUTS OUTPUT AND I/O Bi† ∑ of H’s A B PARITY ERR‡ FUNCTION OEB OEA CLR CLK Ai ∑ of H’s L H X X Odd Even NA NA A L H NA H L H ↑ NA Odd Even B NA NA H L B data to A bus and check parity X X L X X X X NA NA H Clear error-flag register H H H L H H No↑ No↑ ↑ ↑ X X Odd Even X Z Z Z NC H H L Isolation§ L L X X Odd Even NA NA A H L NA A data to B bus and generate inverted parity A data to B bus and generate parity NA = not applicable, NC = no change, X = don’t care † Summation of high-level inputs includes PARITY along with Bi inputs. ‡ Output states shown assume the ERR output was previously high. § In this mode, the ERR output, when enabled, shows inverted parity of the A bus. Copyright 1993, Texas Instruments Incorporated ! " #$%! " &$'(#! )!%* )$#!" # ! "&%##!" &% !+% !%" %," "!$%!" "!)) -!.* )$#! &#%""/ )%" ! %#%""(. #($)% !%"!/ (( &%!%"* • DALLAS, TEXAS 75265 • HOUSTON, TEXAS 77251−1443 POST OFFICE BOX 655303 POST OFFICE BOX 1443 2−1 SCBS003C − SEPTEMBER 1987 − REVISED NOVEMBER 1993 functional logic diagram (positive logic) A1 −A8 8x 8 8 B1 −B8 EN 8x 8 EN OEB PARITY 8 OEA 8 MUX 1 1 2k 9 P 1 1 G1 1D CLK C1 CLR 2−2 R • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • ERR SCBS003C − SEPTEMBER 1987 − REVISED NOVEMBER 1993 error-flag waveforms OEB H L OEA H L Even Bi + PARITY Odd tsu th H L CLK tw tsu tw H L CLR tPHL tPLH H L ERR ERROR-FLAG FUNCTION TABLE INPUTS INTERNAL TO DEVICE OUTPUT PRESTATE OUTPUT FUNCTION CLR CLK POINT P ERRn−1† ERR H H H ↑ ↑ ↑ H X L H L X H L L Sample L X X X H Clear † ERRn−1 represents the state of the ERR output before any changes at CLR, CLK, or point P. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage applied to a disabled I/O port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 2−3 SCBS003C − SEPTEMBER 1987 − REVISED NOVEMBER 1993 recommended operating conditions MIN NOM MAX 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL VOH Low-level input voltage High-level output voltage, ERR 2.4 V IOH IOL High-level output current −24 mA 48 mA TA Operating free-air temperature 70 °C High-level input voltage 2 V V 0.8 Low-level output current 0 V electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK TEST CONDITIONS VCC = 4.5 V, VOH All inputs /outputs except ERR VCC = 4.5 V IOH VOL ERR VCC = 4.5 V, VCC = 4.5 V, II IIH‡ IIL‡ MIN II = −18 mA IOH = − 15 mA TYP† V V 2 20 IOL = 48 mA VI = 5.5 V 0.35 µA 0.5 V 0.1 mA VI = 2.7 V 20 µA VCC = 5.5 V, VI = 0.4 V −0.75 VCC = 5.5 V, VCC = 5.5 V, VO = 0 Outputs open Data IOS§ ICCL UNIT −1.2 2.4 IOH = − 24 mA VOH = 2.4 V VCC = 5.5 V, VCC = 5.5 V, Control MAX −0.2 −75 ICCZ VCC = 5.5 V, Outputs open † All typical values are at VCC = 5 V, TA = 25°C. ‡ These parameters include off-state output current for I/O ports only. § Not more than one output should be tested at a time, and the duration of the test should not exceed one second. mA −250 mA 55 80 mA 30 45 mA timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) MIN tw Pulse duration tsu Setup time before CLK↑ th Hold time after CLK↑ 2−4 CLK high 10 CLK low 10 CLR low 10 Bi and PARITY 12 CLR inactive 12 Bi and PARITY • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 0 MAX UNIT ns ns ns SCBS003C − SEPTEMBER 1987 − REVISED NOVEMBER 1993 switching characteristics (see Note 1) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A or B B or A tPLH tPHL A PARITY tPZH tPZL OEA or OEB A or B tPHZ tPLZ OEA or OEB A or B CLK tPLH tPLH tPHL CLR OEA ERR PARITY VCC = 5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = 25°C VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† MIN TYP MAX MIN MAX 1 5 7 1 8 1.5 5 8 1.5 10 1.5 7 9 1.5 11 1.5 10 13 1.5 15 2 11 15 2 19 2 13 17 2 21 2 8 11 2 15 2 10 14 2 17 1.5 7 10 1.5 12 1.5 13 17 1.5 20 1.5 10 13 1.5 15 1.5 10 13 1.5 15 UNIT ns ns ns ns ns ns † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 1: Load circuits and voltage waveforms are shown in Section 1. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 2−5 SCBS003C − SEPTEMBER 1987 − REVISED NOVEMBER 1993 2−6 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Amplifiers Data Converters DSP Clocks and Timers Interface Logic Power Mgmt Microcontrollers RFID RF/IF and ZigBee® Solutions amplifier.ti.com dataconverter.ti.com dsp.ti.com www.ti.com/clocks interface.ti.com logic.ti.com power.ti.com microcontroller.ti.com www.ti-rfid.com www.ti.com/lprf Applications Audio Automotive Broadband Digital Control Medical Military Optical Networking Security Telephony Video & Imaging Wireless www.ti.com/audio www.ti.com/automotive www.ti.com/broadband www.ti.com/digitalcontrol www.ti.com/medical www.ti.com/military www.ti.com/opticalnetwork www.ti.com/security www.ti.com/telephony www.ti.com/video www.ti.com/wireless Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2008, Texas Instruments Incorporated