SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS132C - DECEMBER 1982 - REVISED FEBRUARY 1999 D D D D D 3-State Version of 'HC151 High-Current 3-State Outputs Interface Directly With System Bus or Can Drive up to 15 LSTTL Loads Perform Parallel-to-Serial Conversion Complementary Outputs Provide True and Inverted Data Package Options Include Plastic Small-Outline (D), Shrink Small-Outline (DB), and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs SN54HC251 . . . J OR W PACKAGE SN74HC251 . . . D, DB, OR N PACKAGE (TOP VIEW) D3 D2 D1 D0 Y W OE GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC D4 D5 D6 D7 A B C SN54HC251 . . . FK PACKAGE (TOP VIEW) The 3-state outputs can interface with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (in the high-impedance state), the low impedance of the single enabled output drives the bus line to a high or low logic level. Both outputs are controlled by the output-enable (OE) input. The outputs are disabled when OE is high. D1 D0 NC Y W 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 D5 D6 NC D7 A OE GND NC C B These data selectors/multiplexers contain full binary decoding to select 1-of-8 data sources and feature strobe-controlled complementary 3-state outputs. D2 D3 NC VCC D4 description NC - No internal connection The SN54HC251 is characterized for operation over the full military temperature range of -55C to 125C. The SN74HC251 is characterized for operation from -40C to 85 C. 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 1999, Texas Instruments Incorporated 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. On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 1 SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS132C - DECEMBER 1982 - REVISED FEBRUARY 1999 FUNCTION TABLE INPUTS OUTPUTS SELECT OE Y W C B A X X X H Z Z L L L L D0 D0 L L H L D1 D1 L H L L D2 D2 L H H L D3 D3 H L L L D4 D4 H L H L D5 D5 H H L L D6 D6 H H H L D7 D7 D0, D1 . . . D7 = the level of the respective D input logic symbol OE A B C D0 D1 D2 D3 D4 D5 D6 D7 MUX 7 EN 11 0 10 9 0 G7 2 4 3 2 0 5 1 6 2 1 3 15 14 13 12 4 5 6 7 This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, DB, J, N, and W packages. 2 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 Y W SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS132C - DECEMBER 1982 - REVISED FEBRUARY 1999 logic diagram (positive logic) OE A B C D0 D1 D2 7 11 10 9 4 TG 3 TG 2 TG 5 D3 D4 TG 15 TG 6 D5 D6 D7 Y 1 14 W TG 13 TG 12 TG Pin numbers shown are for the D, DB, J, N, and W packages. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 3 SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS132C - DECEMBER 1982 - REVISED FEBRUARY 1999 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, JA (see Note 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113C/W DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -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. 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 (see Note 3) SN54HC251 VCC Supply voltage VIH High-level input voltage VCC = 2 V VCC = 4.5 V VCC = 6 V VCC = 2 V VIL Low-level input voltage VI VO Input voltage Output voltage tt Input transition (rise and fall) time SN74HC251 MIN NOM MAX MIN NOM MAX 2 5 6 2 5 6 1.5 1.5 3.15 3.15 4.2 4.2 V V 0 0.5 0 0.5 0 1.35 0 1.35 0 1.8 0 1.8 0 0 0 VCC VCC 0 VCC VCC VCC = 2 V VCC = 4.5 V 0 1000 0 1000 0 500 0 500 VCC = 6 V 0 400 0 400 VCC = 4.5 V VCC = 6 V UNIT 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. 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS132C - DECEMBER 1982 - REVISED FEBRUARY 1999 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = -20 A VOH VI = VIH or VIL IOH = -6 mA IOH = -7.8 mA IOL = 20 A VOL VI = VIH or VIL IOL = 6 mA IOL = 7.8 mA II IOZ VI = VCC or 0 VO = VCC or 0, ICC Ci VI = VCC or 0, VI = VIH or VIL IO = 0 VCC MIN TA = 25C TYP MAX SN54HC251 MIN MAX SN74HC251 MIN 2V 1.9 1.998 1.9 1.9 4.5 V 4.4 4.499 4.4 4.4 6V 5.9 5.999 5.9 5.9 4.5 V 3.98 4.3 3.7 3.84 6V 5.48 5.8 5.2 MAX UNIT V 5.34 2V 0.002 0.1 0.1 0.1 4.5 V 0.001 0.1 0.1 0.1 6V 0.001 0.1 0.1 0.1 4.5 V 0.17 0.26 0.4 0.33 6V 0.15 0.26 0.4 0.33 6V 0.1 100 1000 1000 nA 6V 0.01 0.5 10 5 A 8 160 80 A 10 10 10 pF 6V 2 V to 6 V 3 V switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 1) PARAMETER tt SN74HC251 VCC 2V 58 205 300 256 A, B, or C W or Y 4.5 V 21 41 60 51 6V 19 35 51 44 2V 44 195 283 244 4.5 V 17 39 57 49 6V 15 33 48 41 2V 30 145 210 181 4.5 V 10 29 42 36 Any D tdis SN54HC251 TO (OUTPUT) tpd d ten TA = 25C MIN TYP MAX FROM (INPUT) OE OE W or Y W or Y W or Y W or Y MIN MAX MIN MAX 6V 9 25 36 31 2V 25 195 283 244 4.5 V 15 39 57 49 6V 14 33 48 41 2V 20 75 110 95 4.5 V 8 15 22 19 6V 6 13 19 16 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 UNIT ns ns ns ns 5 SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS132C - DECEMBER 1982 - REVISED FEBRUARY 1999 switching characteristics over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) A, B, or C TO (OUTPUT) W or Y tpd d Any D ten OE tt W or Y W or Y W or Y VCC MIN TA = 25C TYP MAX SN54HC251 MIN MAX SN74HC251 MIN MAX 2V 72 300 450 375 4.5 V 25 60 90 75 6V 22 52 77 65 2V 59 300 450 375 4.5 V 21 60 90 75 6V 18 52 77 65 2V 50 230 340 285 4.5 V 17 46 68 57 6V 15 40 58 50 2V 45 210 315 265 4.5 V 17 42 63 53 6V 13 36 53 45 UNIT ns ns ns operating characteristics, TA = 25C PARAMETER Cpd 6 TEST CONDITIONS Power dissipation capacitance No load POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TYP 70 UNIT pF SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SCLS132C - DECEMBER 1982 - REVISED FEBRUARY 1999 PARAMETER MEASUREMENT INFORMATION VCC PARAMETER Test Point From Output Under Test S1 RL CL (see Note A) tPZH ten 1 k tPZL tPHZ tdis S2 RL 1 k CL S1 S2 50 pF or 150 pF Open Closed Closed Open Open Closed Closed Open Open Open 50 pF tPLZ tpd or tt -- LOAD CIRCUIT 50 pF or 150 pF VCC Input 50% 50% 0V tPLH In-Phase Output 50% 10% tPHL 90% VOH 50% 10% V OL tf 90% tr tPHL Out-of-Phase Output 90% tPLH 50% 10% 50% 10% 90% VOH VOL tf tr VOLTAGE WAVEFORMS PROPAGATION DELAY AND OUTPUT TRANSITION TIMES Output Control (Low-Level Enabling) VCC 50% 50% 0V tPZL Output Waveform 1 (See Note B) tPLZ VCC 50% 10% VCC VOL tPZH Input 50% 10% 90% VCC 90% 50% 10% 0 V tr Output Waveform 2 (See Note B) 90% VOH 0V tPHZ tf VOLTAGE WAVEFORM INPUT RISE AND FALL TIMES 50% 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 , 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 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. 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