Table Of Content

• TEXAS INSTRUMENTS NuBuS™ Interface Products 1991 General Information 1tjII ~ ___N_ _U _ B_us_m_ _D_ e_V_ic_e_ D__ a_ta_ _S_ h_ee_t_s_ _______ ~ ~If_411 ___A_ _ P_ PI_ic_a_t_io_n_R_e_p_o_r_ts_· ____________ ~ ~1I_,til ___E _x_p_l_an_a_t_io_n_ _o_ f_L_O_9_iC_S_y__m_ b_ O_IS_ ___ ~ ~1II ___M_ _e _ c_h_an_i_c_al__D _at_ a_ ________________ 12II ~ ___E _S_D_ _G _U_id_e_l_in_e_s _________________ NuBus™ Interface Products Data Book JiJi TEXAS. INSTRUMENTS IMPORTANT NOTICE Texas Instruments (TI) reserves the right to make changes to or to discontinue any semiconductor product or service identified in this publication without notice. TI advises its customers to obtain the latest version of the relevant information to verify, before placing orders, that the information being relied upon is current. TI warrants performance of its semiconductor products to current specifications in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Unless mandated by government requirements, specific testing of all parameters of each device is not necessarily performed. TI assumes no liability for TI applications assistance, customer product design, software performance, or infringement of patents or services described herein. Nor does TI warrant or represent that license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. Texas Instruments products are not intended for use in life-support appliances, devices, or systems. Use of a TI product in such applications without the written consent of the appropriate TI officer is prohibited. Copyright © 1990, Texas Instruments Incorporated FIRST EDITION: APRIL 1990 FIRST REVISION: JANUARY 1991 SECOND REVISION: JUNE 1991 Printed in the U.S.A. INTRODUCTION This Data Book presents technical information on the TI NuBus™ support product line. Specifications and operational information is included for the following high-performance Advanced-CMOS devices: 1. SN74ACT2440 - NuBus™ Interface Controller 2. SN74ACT2441 - MCPt NuBus™ Interface Controller 3. SN74ALS2442 - NuBus'" Block Slave Address Generator 4. SN74BCT2420 - NuBusT Address/Data Tranceiver and Registers " 5. SN74BCT2423/24 - 16-Bit Latched Multiplexer/Demultiplexer Bus Transceivers 6. SN74BCT2425 - MCPt NuBusT Address/Data Tranceivers and Registers. " In addition, this Data Book contains design specification data for all six devices previously listed. Three application reports are also included: Support NuBusT Block Slave Transfers " USing Texas Instruments SN74ACT2440, SN74BCT2420, and SN74ALS2442, Designing Simple NuBus™ Slave-Only Applications USing Texas Instruments SN74ACT2440 and SN74BCT2420, and Memory Interleavel Interface Applications using Texas Instruments SN74BCT2423 and SN74BCT2424. A section on the development of logic symbols to meet both ANSI/IEEE Std 91-1984 and IEC Publication 617-12 is included for the reader's better understanding. The ESO Guidelines utilized by TI are discussed in another section for the reader's better understanding. Package dimensions are given in the Mechanical Data section of the book in metric measurement (and parenthetically In inches). Complete technical data for any Texas Instruments semiconductor product is available from your nearest TI field sales office, local authorized TI distributor, or by calling Texas Instruments at 1-800-232-3200. t Macintosh Coprocessor Platform NuBus is a trademark of Texas Instruments Incorporated. v vi General Information ' 1-1 Contents Page Alphanumeric Index .................................... 1-3 Ordering Instructions ................................... , 1-5 Glossary ........................................" . . . .. 1-7 Timing Interval Conventions ......................... . . . .. 1-11 Explanation of Function Tables . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-15 Timing Diagram Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-17 Basic Data Sheet Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-19 1-2 ALPHANUMERIC INDEX SN74ACT2440 .................... 2-35 SN74BCT2423 .................... . 2-13 SN74ACT2441 .................... 2-67 SN74BCT2424 .................... . 2-13 SN74ALS2442 . . . . . . . . . . . . . . . . . . . .. 2-119 SN74BCT2425 .................... . 2-23 SN74BCT2420..................... 2-3 TEXAS ." INSTRUMENTS POST OFFICE BOX 655303 • DALLAS. TEXAS 75265 1-3