SN54AS250A, SN74AS250A 1-OF-16 DATA GENERATORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994 • • • • 4-Line to 1-Line Multiplexers That Can Select 1-of-16 Data Inputs Applications: Boolean Function Generator Parallel-to-Serial Converter Data Source Selector Buffered 3-State Bus Driver Inputs Permit Multiplexing From n Lines to One Line Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs SN54AS250A . . . JT PACKAGE SN74AS250A . . . DW OR NT PACKAGE (TOP VIEW) E7 E6 E5 E4 E3 E2 E1 E0 OE W D GND description The ′AS250A devices provide full binary decoding to select 1-of-16 data inputs or use sources as an input with an inverting W output. The selected sources are buffered with symmetrical propagation delay times. This reduces the possibility of transients occurring at the output. OE does not affect the internal operations of the data selector/multiplexer. New data can be set up while the outputs are disabled. The SN54AS250A is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74AS250A is characterized for operation from 0°C to 70°C. 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 16 10 15 11 14 12 13 VCC E8 E9 E10 E11 E12 E13 E14 E15 A B C E5 E6 E7 NC VCC E8 E9 SN54AS250A . . . FK PACKAGE (TOP VIEW) E4 E3 E2 NC E1 E0 OE 4 3 2 1 28 27 26 5 25 6 24 7 23 8 22 9 21 10 20 11 19 12 13 14 15 16 17 18 E10 E11 E12 NC E13 E14 E15 W D GND NC C B A A buffered output-enable (OE) input can be used for n-line to 1-line cascading. Taking OE high places the output in the high-impedance state. In the high-impedance state, the output neither loads nor drives the bus lines significantly. 1 NC – No internal connection Copyright 1994, 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. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN54AS250A, SN74AS250A 1-OF-16 DATA GENERATORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994 logic symbol† FUNCTION TABLE INPUTS OE A B C D Ei OUTPUT W L L L L L E0 E0 L H L L L E1 E1 L L H L L E2 E2 9 OE A B L H H L L E3 E3 C L L L H L E4 E4 D L H L H L E5 E5 E0 L L H H L E6 E6 E1 L H H H L E7 E7 E2 L L L L H E8 E8 E3 L H L L H E9 E9 E4 L L H L H E10 E10 E5 L H H L H E11 E11 E6 L L L H H E12 E12 L H L H H E13 E13 L L H H H E14 E14 L H H H H E15 E15 H X X X X X Z E7 E8 E9 E10 E11 E12 E13 E14 E15 15 MUX EN 0 14 G 13 11 0 15 3 8 7 6 5 4 10 3 2 1 23 22 21 20 19 18 17 16 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the DW, JT, and NT packages. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 W SN54AS250A, SN74AS250A 1-OF-16 DATA GENERATORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994 logic diagram (positive logic) E0 E1 E2 E3 E4 E5 E6 E7 Data Inputs E8 E9 E10 E11 E12 E13 E14 E15 A 8 7 6 5 4 3 2 1 10 23 W 22 21 20 19 18 17 16 15 A A B 14 B Data Selects B C 13 C C D 11 D D OE Pin numbers shown are for the DW, JT, and NT packages. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN54AS250A, SN74AS250A 1-OF-16 DATA GENERATORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS137A – DECEMBER 1983 – 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 Operating free-air temperature range, TA: SN54AS250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74AS250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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. recommended operating conditions SN54AS250A SN74AS250A MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IOH Low-level input voltage 0.8 0.8 V High-level output current – 12 – 15 mA IOL TA Low-level output current 32 48 mA 70 °C High-level input voltage 2 Operating free-air temperature 2 – 55 125 V V 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 2 mA VCC = 4 4.5 5V IOH = – 12 mA IOH = – 15 mA VOL 5V VCC = 4 4.5 IOL = 32 mA IOL = 48 mA IOZH IOZL VCC = 5.5 V, VCC = 5.5 V, VO = 2.7 V VO = 0.4 V II IIH VCC = 5.5 V, VCC = 5.5 V, VI = 7 V VI = 2.7 V IIL IO§ VCC = 5.5 V, VCC = 5.5 V, VI = 0.4 V VO = 2.25 V VOH ICC VCC = 5.5 V SN54AS250A TYP‡ MAX MIN SN74AS250A TYP‡ MAX MIN – 1.2 VCC – 2 2.4 – 1.2 UNIT V VCC – 2 V 3.3 2.4 0.35 3.3 0.5 0.35 – 30 0.5 V µA 50 50 – 50 – 50 µA 0.1 0.1 mA 20 20 µA – 0.5 – 0.5 mA – 112 mA – 112 – 30 Outputs high 26 42 26 42 Outputs low 31 50 31 50 mA Outputs disabled 30 48 30 48 ‡ All typical values are at VCC = 5 V, TA = 25°C. § The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN54AS250A, SN74AS250A 1-OF-16 DATA GENERATORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† SN54AS250A tPLH tPHL Data W tPLH tPHL A B, A, B C, C D W tPZH tPZL OE W tPHZ tPLZ OE W UNIT SN74AS250A MIN MAX MIN MAX 2 9.5 2 8 2 8.5 2 7 4 15.5 4 13 4 12 4 10.5 2 7.5 2 7 2 10 2 9 1.5 6.5 1.5 6 2 8.5 2 6.5 ns ns ns ns † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN54AS250A, SN74AS250A 1-OF-16 DATA GENERATORS/MULTIPLEXERS WITH 3-STATE OUTPUTS SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2 VCC S1 RL R1 Test Point From Output Under Test CL (see Note A) From Output Under Test RL Test Point From Output Under Test CL (see Note A) CL (see Note A) LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS 3.5 V Timing Input Test Point LOAD CIRCUIT FOR 3-STATE OUTPUTS 3.5 V High-Level Pulse 1.3 V R2 1.3 V 1.3 V 0.3 V 0.3 V Data Input tw th tsu 3.5 V 1.3 V 3.5 V Low-Level Pulse 1.3 V 0.3 V 1.3 V 0.3 V VOLTAGE WAVEFORMS SETUP AND HOLD TIMES VOLTAGE WAVEFORMS PULSE DURATIONS 3.5 V Output Control (low-level enabling) 1.3 V 1.3 V 0.3 V tPZL Waveform 1 S1 Closed (see Note B) tPLZ [3.5 V 1.3 V tPHZ tPZH Waveform 2 S1 Open (see Note B) 1.3 V VOL 0.3 V VOH 1.3 V 0.3 V [0 V 3.5 V 1.3 V Input 1.3 V 0.3 V tPHL tPLH VOH In-Phase Output 1.3 V 1.3 V VOL tPLH tPHL VOH Out-of-Phase Output (see Note C) 1.3 V 1.3 V VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES 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 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 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. 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