QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/ MULTIPLEXERS

www.DataSheet4U.com SN54HCT257, SN74HCT257 QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003 D Operating Voltage Range of 4.5 V to 5.5 V D High-Current 3-State Outputs Interface Directly With System Bus D Typical tpd = 17 ns D Low Power Consumption, 80-µA Max ICC D ±6-mA Output Drive at 5 V SN54HCT257 . . . J PACKAGE SN74HCT257 . . . D OR N PACKAGE (TOP VIEW) D Low Input Current of 1 µA Max D Inputs Are TTL-Voltage Compatible D Provide Bus Interface From Multiple D Sources in High-Performance Systems Buffered Inputs and Outputs SN54HCT257 . . . FK PACKAGE (TOP VIEW) NC − No internal connection description/ordering information The ’HCT257 devices 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. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. ORDERING INFORMATION TA PDIP − N −40°C to 85°C PACKAGE† Tube of 25 Tube of 40 SOIC − D CDIP − J −55°C to 125°C Reel of 2500 Reel of 250 Tube of 25 ORDERABLE PART NUMBER SN74HCT257N SN74HCT257D SN74HCT257DR SN74HCT257DT SNJ54HCT257J SNJ54HCT257J HCT257 TOP-SIDE MARKING SN74HCT257N LCCC − FK Tube of 55 SNJ54HCT257FK SNJ54HCT257FK † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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. 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 2Y GND NC 3Y 3B Copyright  2003, Texas Instruments Incorporated 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 1A A/B NC VCC OE 1B 1Y NC 2A 2B 4 5 6 7 8 3 2 1 20 19 18 17 16 15 14 9 10 11 12 13 4A 4B NC 4Y 3A 1 www.DataSheet4U.com SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003 SN54HCT257, SN74HCT257 QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS FUNCTION TABLE INPUTS OE H L L L L SELECT A/B X L L H H DATA A X L H X X B X X X L H Z L H L H OUTPUT Y logic diagram (positive logic) OE 15 A/B 1 1A 2 4 3 1Y 1B 2A 5 7 6 2Y 2B 3A 11 9 10 3Y 3B 4A 14 12 13 4Y 4B Pin numbers shown are for the D, J, and N packages. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 www.DataSheet4U.com SN54HCT257, SN74HCT257 QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† 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): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°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 51-7. recommended operating conditions (see Note 3) SN54HCT257 MIN VCC VIH VIL VI VO tt Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage Input transition (rise and fall) time VCC = 4.5 V to 5.5 V VCC = 4.5 V to 5.5 V 4.5 2 0.8 0 0 VCC VCC 500 0 0 NOM 5 MAX 5.5 SN74HCT257 MIN 4.5 2 0.8 VCC VCC 500 NOM 5 MAX 5.5 UNIT V V V V V ns TA Operating free-air temperature −55 125 −40 85 °C NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VOH VOL II IOZ ICC ∆ICC‡ Ci TEST CONDITIONS VI = VIH or VIL VI = VIH or VIL VI = VCC or 0 VO = VCC or 0, IOH = −20 µA IOH = −6 mA IOL = 20 µA IOL = 6 mA VCC 4.5 V 4.5 V 5.5 V 5.5 V 5.5 V 5.5 V 4.5 V to 5.5 V 1.4 3 TA = 25°C MIN TYP MAX 4.4 3.98 4.499 4.3 0.001 0.17 ±0.1 ±0.01 0.1 0.26 ±100 ±0.5 8 2.4 10 SN54HCT257 MIN 4.4 3.7 0.1 0.4 ±1000 ±10 160 3 10* MAX SN74HCT257 MIN 4.4 3.84 0.1 0.33 ±1000 ±5 80 2.9 10 V nA µA µA mA pF V MAX UNIT VI = VIH or VIL VI = VCC or 0, IO = 0 One input at 0.5 V or 2.4 V, Other inputs at 0 or VCC * 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 www.DataSheet4U.com SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003 SN54HCT257, SN74HCT257 QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) A or B tpd A/B ten tdis tt OE OE Y Y Y Any TO (OUTPUT) Y VCC 4.5 V 5.5 V 4.5 V 5.5 V 4.5 V 5.5 V 4.5 V 5.5 V 4.5 V 5.5 V MIN TA = 25°C TYP MAX 20 17 20 17 20 17 20 17 8 7 30 27 30 27 30 27 30 27 15 14 SN54HCT257 MIN MAX 45 40 45 40 45 40 45 40 22 21 SN74HCT257 MIN MAX 38 34 38 34 38 34 38 34 19 17 ns ns ns ns UNIT switching characteristics over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) A or B tpd A/B ten tt OE Y Y Any TO (OUTPUT) Y VCC 4.5 V 5.5 V 4.5 V 5.5 V 4.5 V 5.5 V 4.5 V 5.5 V MIN TA = 25°C TYP MAX 22 19 22 19 23 20 17 14 38 35 38 35 40 38 42 38 SN54HCT257 MIN MAX 57 53 57 53 60 57 63 57 SN74HCT257 MIN MAX 48 44 48 44 50 48 53 48 ns ns ns UNIT operating characteristics, TA = 25°C PARAMETER Cpd Power dissipation capacitance TEST CONDITIONS No load TYP 13 UNIT pF 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 www.DataSheet4U.com SN54HCT257, SN74HCT257 QUADRUPLE 2 LINE TO 1 LINE DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003 PARAMETER MEASUREMENT INFORMATION VCC S1 RL PARAMETER ten tPZH tPZL tPHZ tPLZ −− 50 pF or 150 pF 1 kΩ RL 1 kΩ CL 50 pF or 150 pF 50 pF S1 Open Closed Open Closed Open S2 Closed Open Closed Open Open From Output Under Test CL (see Note A) Test Point S2 tdis tpd or tt LOAD CIRCUIT 3V Input 1.3 V tPLH In-Phase Output 1.3 V 10% tPHL Out-ofPhase Output 90% 1.3 V 10% tf VOLTAGE WAVEFORMS OUTPUT AND 3-STATE BIDIRECTIONAL I/O PROPAGATION DELAY TIME 90% tr tPLH 1.3 V 10% 90% tr VOH VOL 1.3 V 0V tPHL 90% VOH 1.3 V 10% V OL tf Output Control (Low-Level Enabling) 3V 1.3 V tPZL 1.3 V 0V tPLZ ≈VCC 1.3 V 10% tPHZ 1.3 V 90% VOH ≈0 V VOL Output Waveform 1 (See Note B) tPZH Output Waveform 2 (See Note B) 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 P