SN54HCT257, SN74HCT257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS072B – NOVEMBER 1988 – REVISED MAY 1997 D D D D D SN54HCT257 . . . J PACKAGE SN74HCT257 . . . N PACKAGE (TOP VIEW) Inputs Are TTL-Voltage Compatible Provide Bus Interface From Multiple Sources in High-Performance Systems High-Current 3-State Outputs Interface Directly With System Bus Buffered Inputs and Outputs Package Options Include Ceramic Chip Carriers (FK) and Standard Plastic (N) and Ceramic (J) 300-mil DIPs A/B 1A 1B 1Y 2A 2B 2Y GND description The SN54HCT257 is characterized for operation over the full military temperature range of –55°C to 125°C. The SN74HCT257 is characterized for operation from –40°C to 85°C. FUNCTION TABLE 1B 1Y NC 2A 2B A B H X X X Z L L L X L L L H X H L H X L L L H X H H 3 14 4 13 5 12 6 11 7 10 8 9 VCC OE 4A 4B 4Y 3A 3B 3Y 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 4A 4B NC 4Y 3A 2Y GND NC 3Y 3B OUTPUT Y DATA SELECT A/B 15 SN54HCT257 . . . FK PACKAGE (TOP VIEW) INPUTS OE 16 2 1A A/B NC VCC OE The ’HCT257 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 the high logic level. 1 NC – No internal connection Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 1997, Texas Instruments Incorporated UNLESS OTHERWISE NOTED this document contains PRODUCTION DATA information 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. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN54HCT257, SN74HCT257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS072B – NOVEMBER 1988 – REVISED MAY 1997 logic symbol† OE A/B 1A 1B 2A 2B 3A 3B 4A 4B 15 1 EN G1 2 1 3 MUX 4 1Y 1 5 7 6 11 9 10 14 12 13 2Y 3Y 4Y † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the J and N packages. logic diagram (positive logic) OE A/B 1A 1B 2A 2B 3A 3B 4A 4B 15 1 2 4 3 5 7 2Y 6 11 9 3Y 10 14 12 13 Pin numbers shown are for the J and N packages. 2 1Y POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 4Y SN54HCT257, SN74HCT257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS072B – NOVEMBER 1988 – REVISED MAY 1997 absolute maximum ratings over operating free-air temperature range† Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA Package thermal impedance, θJA (see Note 2): N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero. recommended operating conditions SN54HCT257 VCC VIH Supply voltage VIL VI Low-level input voltage VO tt TA Operating free-air temperature High-level input voltage VCC = 4.5 V to 5.5 V VCC = 4.5 V to 5.5 V SN74HCT257 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 2 2 UNIT V V 0 0.8 0 0.8 V Input voltage 0 0 VCC VCC V 0 VCC VCC 0 Output voltage Input transition (rise and fall) time 0 500 0 500 ns –55 125 –40 85 °C V electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VCC VOH VI = VIH or VIL IOH = –20 µA IOH = –6 mA 45V 4.5 VOL VI = VIH or VIL IOL = 20 µA IOL = 6 mA 45V 4.5 II IOZ VI = VCC or 0 VO = VCC or 0, ICC VI = VCC or 0, One input at 0.5 V or 2.4 V, Other inputs at 0 or VCC ∆ICC‡ VI = VIH or VIL IO = 0 Ci MIN TA = 25°C TYP MAX SN54HCT257 MIN MAX SN74HCT257 MIN 4.4 4.499 4.4 4.4 3.98 4.3 3.7 3.84 MAX UNIT V 0.001 0.1 0.1 0.1 0.17 0.26 0.4 0.33 5.5 V ±0.1 ±100 ±1000 ±1000 nA 5.5 V ±0.01 ±0.5 ±10 ±5 µA 8 160 80 µA 1.4 2.4 3 2.9 mA 3 10 10* 10 pF 5.5 V 5.5 V 4.5 V to 5.5 V V * On products compliant to MIL-PRF-38535, this parameter is not production tested. ‡ This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC. PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN54HCT257, SN74HCT257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS072B – NOVEMBER 1988 – REVISED MAY 1997 switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) A or B Y tpd d Y A/B ten OE Y tdis di OE Y tt Any VCC MIN TA = 25°C TYP MAX SN54HCT257 MIN MAX SN74HCT257 MIN MAX 4.5 V 20 30 45 38 5.5 V 17 27 40 34 4.5 V 20 30 45 38 5.5 V 17 27 40 34 4.5 V 20 30 45 38 5.5 V 17 27 40 34 4.5 V 20 30 45 38 5.5 V 17 27 40 34 4.5 V 8 15 22 19 5.5 V 7 14 21 17 UNIT ns ns ns ns switching characteristics over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) A or B Y tpd d ten A/B Y OE Y tt Any VCC MIN TA = 25°C TYP MAX SN54HCT257 MIN MAX SN74HCT257 MIN MAX 4.5 V 22 38 57 48 5.5 V 19 35 53 44 4.5 V 22 38 57 48 5.5 V 19 35 53 44 4.5 V 23 40 60 50 5.5 V 20 38 57 48 4.5 V 17 42 63 53 5.5 V 14 38 57 48 UNIT ns ns ns operating characteristics, TA = 25°C PARAMETER Cpd TEST CONDITIONS Power dissipation capacitance No load PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TYP 13 UNIT pF SN54HCT257, SN74HCT257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS072B – NOVEMBER 1988 – REVISED MAY 1997 PARAMETER MEASUREMENT INFORMATION VCC From Output Under Test CL (see Note A) PARAMETER S1 Test Point tPZH ten RL S2 1 kΩ tPZL tPHZ tdis 3V 1.3 V 0V tPLH In-Phase Output 1.3 V 10% tPHL 90% 90% tr tPHL Out-ofPhase Output 90% VOH 1.3 V 10% V OL tf tPLH 1.3 V 10% 1.3 V 10% tf S2 50 pF or 150 pF Open Closed Closed Open 1 kΩ –– LOAD CIRCUIT 1.3 V S1 50 pF tPLZ tpd or tt Input CL RL Output Control (Low-Level Enabling) 50 pF or 150 pF Open Closed Closed Open Open Open 3V 1.3 V 1.3 V 0V tPZL Output Waveform 1 (See Note B) tPLZ ≈ VCC 1.3 V 10% VOL tPZH 90% VOH VOL tr VOLTAGE WAVEFORMS OUTPUT AND 3-STATE BIDIRECTIONAL I/O PROPAGATION DELAY TIME Output Waveform 2 (See Note B) 1.3 V 90% VOH ≈0V tPHZ VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS NOTES: A. CL includes probe and test-fixture 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. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns. D. The outputs are measured one at a time with one input transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd. Figure 1. Load Circuit and Voltage Waveforms 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 1998, Texas Instruments Incorporated