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| SN54ALS137, SN74ALS137A SN54AS137, SN74AS137 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS WITH ADDRESS LATCHES SDAS203B - APRIL 1982 - REVISED DECEMBER 1994 * * * Combines Decoder and 3-Bit Address Latch Incorporates Two Output Enables to Simplify Cascading Package Options Include Plastic SmallOutline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs SN54ALS137, SN54AS137 . . . J PACKAGE SN74ALS137A, SN74AS137 . . . D OR N PACKAGE (TOP VIEW) description The SN54ALS137, SN74ALS137A, and AS137 are 3-line to 8-line decoders/demultiplexers with latches on the three address inputs. When the latch-enable (LE) input is low, the SN54ALS137, SN74ALS137A, and AS137 act as a decoder/demultiplexer. When LE goes from low to high, the address present at the select (A, B, and C) inputs is stored in the latches. Further address changes are ignored as long as LE remains high. The output-enable (OE1 and OE2) inputs control the outputs independently of the select or latch-enable inputs. All of the outputs are forced high if OE1 is low or OE2 is high. The SN54ALS137, SN74ALS137A, and AS137 are ideally suited for implementing glitch-free decoders in strobed (stored-address) applications in bus-oriented systems. The SN54ALS137 and SN54AS137 are characterized for operation over the full military temperature range of - 55C to 125C. The SN74ALS137A and SN74AS137 are characterized for operation from 0C to 70C. A B C LE OE2 OE1 Y7 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC Y0 Y1 Y2 Y3 Y4 Y5 Y6 SN54ALS137, SN54AS137 . . . FK PACKAGE (TOP VIEW) C LE NC OE2 OE1 4 5 6 7 8 3 2 1 20 19 18 17 16 15 14 9 10 11 12 13 B A NC VCC Y0 Y1 Y2 NC Y3 Y4 NC - No internal connection 4 logic symbols (alternatives) 4 LE A B C 1 2 3 8D 1 2 4 6 5 OE2 & EN C8 X/Y 0 1 2 3 4 OE1 5 6 7 15 14 13 12 11 10 9 7 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 OE1 OE2 6 5 & LE A B C 1 2 3 2 8D 0 G 0 7 C8 DMUX 0 1 2 3 4 5 6 7 15 14 13 12 11 10 9 7 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages. 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) 1994, Texas Instruments Incorporated POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 Y7 GND NC Y6 Y5 1 SN54ALS137, SN74ALS137A SN54AS137, SN74AS137 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS WITH ADDRESS LATCHES SDAS203B - APRIL 1982 - REVISED JANUARY 1995 logic diagram (positive logic) A 1 15 Y0 14 Y1 13 Select Inputs B 2 Y2 12 Y3 Data Outputs 11 C 3 10 Y4 Y5 9 Latch Enable LE 4 Y6 7 OE2 Output Enables OE1 5 6 Y7 Pin numbers shown are for the D, J, and N packages. FUNCTION TABLE INPUTS ENABLE LE X X L L L L L L L L H OE1 X L H H H H H H H H H OE2 H X L L L L L L L L L C X X L L L L H H H H X SELECT B X X L L H H L L H H X A X X L H L H L H L H X Y0 H H L H H H H H H H Y1 H H H L H H H H H H Y2 H H H H L H H H H H OUTPUTS Y3 H H H H H L H H H H Y4 H H H H H H L H H H Y5 H H H H H H H L H H Y6 H H H H H H H H L H Y7 H H H H H H H H H L Outputs corresponding to stored address, L; all others, H 2 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54ALS137, SN74ALS137A SN54AS137, SN74AS137 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS WITH ADDRESS LATCHES SDAS203B - APRIL 1982 - REVISED JANUARY 1995 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: SN54ALS137 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 55C to 125C SN74ALS137A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. recommended operating conditions SN54ALS137 MIN VCC VIH VIL IOH IOL tw tsu th TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Pulse duration, LE low Setup time at A, B, and C before LE Hold time at A, B, and C after LE Operating free-air temperature 15 15 5 - 55 125 4.5 2 0.7 - 0.4 4 10 10 5 0 70 NOM 5 MAX 5.5 SN74ALS137A MIN 4.5 2 0.8 - 0.4 8 NOM 5 MAX 5.5 UNIT V V V mA mA ns ns ns C electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH VOL II IIH IIL IO TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4 5 V 4.5 VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, II = - 18 mA IOH = - 0.4 mA IOL = 4 mA IOL = 8 mA VI = 7 V VI = 2.7 V VI = 0.4 V VO = 2.25 V - 30 MIN SN54ALS137 TYP MAX - 1.5 VCC - 2 0.25 0.4 0.1 20 - 0.1 - 112 - 30 VCC - 2 0.25 0.35 0.4 0.5 0.1 20 - 0.1 - 112 MIN SN74ALS137A TYP MAX - 1.5 UNIT V V V mA A mA mA ICC VCC = 5.5 V 5 11 5 11 mA All typical values are at VCC = 5 V, TA = 25C. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 3 SN54ALS137, SN74ALS137A SN54AS137, SN74AS137 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS WITH ADDRESS LATCHES SDAS203B - APRIL 1982 - REVISED JANUARY 1995 switching characteristics (see Figure 1) VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 , TA = MIN to MAX SN54ALS137 MIN tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL A, B, ABC Y Y Y Y 5 6 4 5 5 5 7 7 MAX 25 25 15 18 21 19 27 25 SN74ALS137A MIN 5 6 3 4 4 4 6 7 MAX 20 20 12 15 17 15 22 20 ns ns ns sn PARAMETER FROM (INPUT) TO (OUTPUT) UNIT OE2 OE1 LE For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. 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: SN54AS137 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 55C to 125C SN74AS137 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. recommended operating conditions SN54AS137 MIN VCC VIH VIL IOH IOL tw tsu th TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Pulse duration, LE low Setup time at A, B, and C before LE Hold time at A, B, and C after LE Operating free-air temperature 5 4.5 1 - 55 125 4.5 2 0.8 -2 20 6.5 4 1 0 70 NOM 5 MAX 5.5 SN74AS137 MIN 4.5 2 0.8 -2 20 NOM 5 MAX 5.5 UNIT V V V mA mA ns ns ns C 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54ALS137, SN74ALS137A SN54AS137, SN74AS137 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS WITH ADDRESS LATCHES SDAS203B - APRIL 1982 - REVISED JANUARY 1995 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH VOL II IIH IIL IO TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, II = - 18 mA IOH = - 2 mA IOL = 20 mA VI = 7 V VI = 2.7 V VI = 0.4 V MIN SN54AS137 TYP MAX - 1.2 VCC - 2 0.35 0.5 0.1 20 - 0.5 VCC - 2 0.35 0.5 0.1 20 -1 MIN SN74AS137 TYP MAX - 1.2 UNIT V V V mA A mA VCC = 5.5 V, VO = 2.25 V - 30 - 112 - 30 - 112 mA ICC VCC = 5.5 V 15 24 15 24 mA All typical values are at VCC = 5 V, TA = 25C. 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) VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 , TA = MIN to MAX SN54AS137 MIN tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL A, B, ABC Y Y Y Y 2 2 2 2 2 2 2 2 MAX 14 14 9 9 11 10 14.5 15 SN74AS137 MIN 2 2 2 2 2 2 3 3 MAX 12.5 12.5 8 8.5 10 9 13.5 14 ns ns ns ns PARAMETER FROM (INPUT) TO (OUTPUT) UNIT OE2 OE1 LE For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 5 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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