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| SN74BCT2952 OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCBS063A - FEBRUARY 1991 - REVISED NOVEMBER 1993 * * * * * * * State-of-the-Art BiCMOS Design Significantly Reduces ICCZ ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015 Two 8-Bit, Back-to-Back Registers Store Data Flowing in Both Directions A Port Sinks 24 mA and Sources 3 mA B Port Sinks 64 mA and Sources 15 mA Noninverting Outputs Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic 300-mil DIPs (NT) DW OR NT PACKAGE (TOP VIEW) description B8 B7 B6 B5 B4 B3 B2 B1 OEAB CLKAB CLKENAB GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC A8 A7 A6 A5 A4 A3 A2 A1 OEBA CLKBA CLKENBA The SN74BCT2952 consists of two 8-bit back-to-back registers that store data flowing in both directions between two bidirectional buses. Data on the A or B bus is stored in the registers on the low-to-high transition of the clock (CLKAB or CLKBA) input provided that the clock-enable (CLKENAB or CLKENBA) input is low. Taking the output-enable (OEAB or OEBA) input low accesses the data on either port. The SN74BCT2952 is characterized for operation from 0C to 70C. FUNCTION TABLE INPUTS CLKENAB H X L L X CLKAB X H or L X OEAB L L L L H A X X L H X OUTPUT B B0 B0 L H Z logic symbol 15 OEBA CLKENBA CLKBA OEAB CLKENAB CLKAB A1 13 14 9 11 10 16 EN3 G1 1 C5 EN4 G2 2 C6 3 6D A2 A3 A4 A5 A6 A7 A8 17 18 19 20 21 22 23 1 1 5D 4 7 6 5 4 3 2 1 B2 B3 B4 B5 B6 B7 B8 8 B1 A-to-B data flow is shown; B-to-A data flow is similar but uses CLKENBA, CLKBA, and OEBA. Level of B before the indicated steady-state input conditions were established. This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. 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. Copyright (c) 1993, Texas Instruments Incorporated POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 2-1 SN74BCT2952 OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCBS063A - FEBRUARY 1991 - REVISED NOVEMBER 1993 logic diagram (positive logic) CLKENAB 11 CLKAB 10 9 OEAB CLKENBA 13 CLKBA 14 OEBA 15 C1 A1 16 1D 8 B1 C1 1D To Seven Other Channels absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.5 V to 7 V Input voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.5 V to 7 V Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . - 0.5 V to 5.5 V Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.5 V to VCC Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 mA Current into any output in the low state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to 70C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to 150C 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. NOTE 1: The input negative-voltage rating may be exceeded if the input clamp-current rating is observed. 2-2 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN74BCT2952 OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCBS063A - FEBRUARY 1991 - REVISED NOVEMBER 1993 recommended operating conditions (see Note 2) MIN VCC VIH VIL IIK IOH IOL Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level High level output current Low-level Low level output current A ports B ports A ports B ports 0 4.5 2 0.8 -18 -3 -15 24 64 70 NOM 5 MAX 5.5 UNIT V V V mA mA mA C TA Operating free-air temperature NOTE 2: Unused or floating pins (input or I/O) must be held high or low. electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK A port VOH B port A port B port Control inputs A or B ports Control inputs A or B ports Control inputs A or B ports Any A Any B VCC = 4.5 V, VCC = 4 5 V 4.5 VCC = 4 5 V 4.5 VCC = 4.75 V, VOL II IIH IIL IOS ICCH ICCL ICCZ Ci Control inputs VCC = 4 5 V 4.5 VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 5.5 V VCC = 5.5 V VCC = 5.5 V VCC = 5 V, VI = 2.5 V or 0.5 V VO = 2.5 V or 0.5 V TEST CONDITIONS II = - 18 mA IOH = - 1 mA IOH = - 3 mA IOH = - 3 mA IOH = - 15 mA IOH = - 3 mA IOL = 24 mA IOL = 64 mA VI = 5 5 V 5.5 VI = 2 7 V 2.7 VI = 0 5 V 0.5 VO = 0 - 60 -100 2 38 2 6 MIN 2.5 2.4 2.4 2 2.7 0.35 0.42 0.5 0.55 1 0.1 70 20 -70 -20 -150 -250 5 55 5 V mA A A mA mA mA mA pF pF TYP 3.4 3.3 3.3 3.1 V MAX -1.2 UNIT V Cio A or B ports VCC = 5 V, 12.5 All typical values are at VCC = 5 V, TA = 25C. For I/O ports, the parameters IIH and IIL include the off-shoot output current. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. ICCH and ICCL are measured in the A-to-B mode. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 2-3 SN74BCT2952 OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCBS063A - FEBRUARY 1991 - REVISED NOVEMBER 1993 timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC = 5 V, TA = 25C MIN fclock tw tsu th Clock frequency Pulse duration, CLK high or low A or B Setup time before CLK Hold time after CLK CLKENAB or CLKENBA A or B CLKENAB or CLKENBA 4 2.5 2 1.5 2.5 MAX 125 4 2.5 2 1.5 2.5 125 MHz ns ns ns MIN MAX UNIT switching characteristics over recommended ranges of supply voltage and operating free-air temperature, CL = 50 pF (unless otherwise noted) (see Note 3) PARAMETER fmax tPLH tPHL tPZH tPZL tPHZ FROM (INPUT) TO (OUTPUT) VCC = 5 V, TA = 25C MIN 125 CLKBA or CLKAB A or B A or B 3.5 5 2.9 5.2 3.5 2.7 5.7 7 5.2 7.6 5.3 4.3 7.5 9.5 6.9 11.4 7.1 6 TYP MAX 125 3.5 5 2.9 5.2 3.5 2.7 9 10.5 8.2 12.9 8.4 7 MHz ns ns ns MIN MAX UNIT OEBA or OEAB OEBA or OEAB A or B tPLZ NOTE 3: Load circuits and voltage waveforms are shown in Section 1. 2-4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale 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. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any 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. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 1998, Texas Instruments Incorporated |
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