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| SN54ALS257, SN54ALS258, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS124B - APRIL 1982 - REVISED DECEMBER 1994 * * * 3-State Outputs Interface Directly With System Bus Provide Bus Interface From Multiple Sources in High-Performance Systems Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs SN54ALS257, SN54ALS258 . . . J PACKAGE SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 . . . D OR N PACKAGE (TOP VIEW) description These data selectors/multiplexers are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at a high logic level. The SN54ALS257 and SN54ALS258 are characterized for operation over the full military temperature range of - 55C to 125C. The SN74ALS257A, SN74ALS258A, SN74AS257, and SN74AS258 are characterized for operation from 0C to 70C. A/B 1A 1B 1Y 2A 2B 2Y GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC OE 4A 4B 4Y 3A 3B 3Y SN54ALS257, SN54ALS258 . . . FK PACKAGE (TOP VIEW) 1B 1Y NC 2A 2B 3 4 5 6 7 8 A/B NC VCC OE 2 1 20 19 18 17 16 15 1A 14 9 10 11 12 13 4A 4B NC 4Y 3A NC - No internal connection FUNCTION TABLE INPUTS DATA OE H L L L L A /B A X L L H H X L H X X B X X X L H OUTPUT Y SN54ALS257 SN74ALS257A SN74AS257 Z L H L H SN54ALS258 SN74ALS258A SN74AS258 Z H L H L 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 2Y GND NC 3Y 3B 1 SN54ALS257, SN54ALS258, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS124B - APRIL 1982 - REVISED DECEMBER 1994 logic symbols SN54ALS257, SN74ALS257A, SN74AS257 15 OE A /B 1A 1B 2A 2B 3A 3B 4A 4B 2 3 5 6 11 10 14 13 12 4Y 9 3Y 7 2Y 1 1 1 EN G1 MUX 4 15 OE A /B 1A 1Y 1B 2A 2B 3A 3B 4A 4B 2 3 5 6 11 10 14 13 12 4Y 9 3Y 7 2Y 1 1 1 SN54ALS258, SN74ALS258A, SN74AS258 EN G1 MUX 4 1Y 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. logic diagrams (positive logic) SN54ALS257, SN74ALS257A, SN74AS257 OE A/B 15 1 OE A /B 15 1 SN54ALS258, SN74ALS258A, SN74AS258 1A 1B 2A 2B 3A 3B 4A 4B 2 4 3 5 7 6 11 9 10 14 12 13 4Y 3Y 2Y 1Y 1A 1B 2A 2B 3A 3B 4A 4B 2 4 3 5 7 6 11 9 10 14 12 13 4Y 3Y 2Y 1Y Pin numbers shown are for the D, J, and N packages. 2 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54ALS257, SN54ALS258, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS124B - APRIL 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 Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54ALS257, SN54ALS258 . . . . . . . . . . . . . . . . - 55C to 125C SN74ALS257A, SN74ALS258A . . . . . . . . . . . . . . . . . 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 SN54ALS257 SN54ALS258 MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature - 55 4.5 2 0.7 -1 12 125 0 NOM 5 MAX 5.5 SN74ALS257A SN74ALS258A MIN 4.5 2 0.8 - 2.6 24 70 NOM 5 MAX 5.5 V V V mA mA C UNIT electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4 5 V 4.5 VCC = 4 5 V 4.5 VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, SN54ALS257 SN54ALS257, SN74ALS257A ICC SN54ALS258, SN54ALS258 SN74ALS258A VCC = 5.5 V VCC = 5.5 V II = - 18 mA IOH = - 0.4 mA IOH = - 1 mA IOH = - 2.6 mA IOL = 12 mA IOL = 24 mA VO = 2.7 V VO = 0.4 V VI = 7 V VI = 2.7 V VI = 0.4 V VO = 2.25 V Outputs high Outputs low Outputs disabled Outputs high Outputs low Outputs disabled - 20 3 8 9 2.5 7 8 SN54ALS257 SN54ALS258 MIN VCC - 2 2.4 TYP MAX - 1.5 VCC - 2 3.3 2.4 0.25 0.4 20 - 20 0.1 20 - 0.1 - 112 6 12 14 4 11 13 - 30 3 8 9 2.5 7 8 3.2 0.25 0.35 0.4 0.5 20 - 20 0.1 20 - 0.1 - 112 6 12 14 4 11 13 mA V A A mA A mA mA V SN74ALS257A SN74ALS258A MIN TYP MAX - 1.5 V UNIT VOH IOZH IOZL II IIH IIL IO 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 SN54ALS257, SN54ALS258, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS124B - APRIL 1982 - REVISED DECEMBER 1994 switching characteristics (see Figure 1) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX SN54ALS257 MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ A or B Any Y Any Y Any Y Any Y 2 2 7 6 4 5 2 4 MAX 12 14 21 25 20 22 12 35 SN74ALS257A MIN 2 2 6 6 4 5 2 4 MAX 10 12 18 22 16 18 10 15 ns ns ns ns PARAMETER FROM (INPUT) TO (OUTPUT) UNIT A /B OE OE For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions. switching characteristics (see Figure 1) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX SN54ALS258 SN74ALS258A MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ A or B Any Y Any Y Any Y Any Y 1 2 5 8 5 5 2 3 MAX 12 9 28 25 20 21 12 37 MIN 2 2 5 6 4 5 2 4 MAX 8 7 25 20 18 18 10 18 ns ns ns ns PARAMETER FROM (INPUT) TO (OUTPUT) UNIT A /B OE OE For conditions shown 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 Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN74AS257, SN74AS258 . . . . . . . . . . . . . . . . . . . . . . 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. 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54ALS257, SN54ALS258, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS124B - APRIL 1982 - REVISED DECEMBER 1994 recommended operating conditions SN74AS257 SN74AS258 MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature 0 4.5 2 0.8 - 15 48 70 NOM 5 MAX 5.5 V V V mA mA C UNIT electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH VOL IOZH IOZL II IIH IIL IO SN74AS257 ICC SN74AS258 VCC = 5.5 V A, B, or OE A/B A, B, or OE A/B A, B, or OE A/B TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4.5 V, VCC = 4.5 V, VCC = 5.5 V, VCC = 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 II = - 18 mA IOH = - 2 mA IOH = - 15 mA IOL = 48 mA VO = 2.7 V VO = 0.4 V VI = 7 V VI = 2 7 V 2.7 VI = 0 4 V 0.4 VO = 2.25 V Outputs high Outputs low Outputs disabled Outputs high Outputs low - 30 12.1 19 19.7 8.4 15.2 SN74AS257 SN74AS258 MIN VCC - 2 2.4 TYP MAX - 1.2 3.2 0.35 0.5 50 - 50 0.1 0.2 20 40 - 0.5 -1 - 112 19.7 30.6 31.9 13.5 24.6 mA V V V A A mA A UNIT mA mA Outputs disabled 15.5 25.2 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 5 SN54ALS257, SN54ALS258, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS124B - APRIL 1982 - REVISED DECEMBER 1994 switching characteristics (see Figure 1) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX SN74AS257 MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ A or B Any Y Any Y Any Y Any Y 1 1 2 2 2 2 1.5 2 MAX 5.5 6 11 10 7.5 9.5 6.5 7 ns ns ns ns PARAMETER FROM (INPUT) TO (OUTPUT) UNIT A /B OE OE For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions. switching characteristics (see Figure 1) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX SN74AS258 MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ A or B Any Y Any Y Any Y Any Y 1 1 2 2 2 2 1.5 2 MAX 5 4 9.5 10 8 10 6 6.5 ns ns ns ns PARAMETER FROM (INPUT) TO (OUTPUT) UNIT A /B OE OE For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions. 6 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54ALS257, SN54ALS258, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS124B - APRIL 1982 - REVISED DECEMBER 1994 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V VCC S1 RL From Output Under Test CL (see Note A) RL Test Point R1 From Output Under Test CL (see Note A) Test Point From Output Under Test CL (see Note A) R2 Test Point RL = R1 = R2 LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS LOAD CIRCUIT FOR 3-STATE OUTPUTS Timing Input tsu Data Input 1.3 V 3.5 V 1.3 V 0.3 V th 3.5 V 1.3 V 0.3 V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES High-Level Pulse 3.5 V 1.3 V tw 1.3 V 0.3 V Low-Level Pulse 3.5 V 1.3 V 1.3 V 0.3 V VOLTAGE WAVEFORMS PULSE DURATIONS Output Control (low-level enabling) tPZL Waveform 1 S1 Closed (see Note B) 3.5 V 1.3 V 1.3 V 0.3 V tPLZ 1.3 V VOL 0.3 V VOH 1.3 V 0.3 V 3.5 V Input tPLH In-Phase Output 1.3 V 1.3 V 1.3 V 0.3 V tPHL VOH 1.3 V VOL tPLH VOH 1.3 V VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES 1.3 V VOL [3.5 V tPHZ tPZH Waveform 2 S1 Open (see Note B) tPHL Out-of-Phase Output (see Note C) [0 V 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 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 7 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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