SDFS066A - MARCH 1987 - REVISED OCTOBER 1993 * * * * * SN54F251B . . . J PACKAGE SN74F251B . . . D OR N PACKAGE (TOP VIEW) 3-State Versions of SN54F151B and SN74F151B 3-State Outputs Interface Directly With System Bus Performs Parallel-to-Serial Conversion Complementary Outputs Provide True and Inverted Data Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs D3 D2 D1 D0 Y W G GND description 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC D4 D5 D6 D7 A B C SN54F251B . . . FK PACKAGE (TOP VIEW) D2 D3 NC VCC D4 These data selectors/multiplexers contain full binary decoding to select one of eight data sources and feature strobe-controlled complementary outputs. The 3-state outputs can interface with and drive data lines of busorganized systems. When the strobe (G) input is high, both outputs are in a high-impedance state in which both the upper and lower transistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly. 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 G GND NC C B D1 D0 NC Y W The SN54F251B is characterized for operation over the full military temperature range of - 55C to 125C. The SN74F251B is characterized for operation from 0C to 70C. NC - No internal connection FUNCTION TABLE INPUTS OUTPUTS SELECT C B A STROBE G Y W 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. Copyright 1993, Texas Instruments Incorporated !"#$%&'#! ( )*$$+!' &( #" ,*-.)&'#! /&'+0 $#/*)'( )#!"#$% '# (,+)")&'#!( ,+$ '1+ '+$%( #" +2&( !('$*%+!'( ('&!/&$/ 3&$$&!'40 $#/*)'#! ,$#)+((!5 /#+( !#' !+)+((&$.4 !).*/+ '+('!5 #" &.. ,&$&%+'+$(0 * DALLAS, TEXAS 75265 * HOUSTON, TEXAS 77251-1443 POST OFFICE BOX 655303 POST OFFICE BOX 1443 2-1 SDFS066A - MARCH 1987 - REVISED OCTOBER 1993 logic symbol G A B C D0 D1 D2 D3 D4 D5 D6 D7 7 11 MUX EN 0 10 9 4 3 2 1 15 14 13 12 0 G7 2 0 5 1 6 2 3 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, J, and N packages. 2-2 * POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443 * Y W SDFS066A - MARCH 1987 - REVISED OCTOBER 1993 logic diagram (positive logic) G D0 D1 D2 D3 4 3 2 1 5 Data Inputs D4 D5 D6 D7 A Data Select (Binary) 7 B C 6 15 Y W 14 13 12 11 10 9 Pin numbers shown are for the D, J, and N packages. absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 7 V Input voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.2 V to 7 V Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 mA to 5 mA Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . -0.5 V to 5.5 V Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to VCC Current into any output in the low state: SN54F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA SN74F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA Operating free-air temperature range: SN54F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55C to 125C SN74F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed. * POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443 * 2-3 SDFS066A - MARCH 1987 - REVISED OCTOBER 1993 recommended operating conditions SN54F251B SN74F251B MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IIK Low-level input voltage 0.8 0.8 V Input clamp current -18 -18 mA IOH IOL High-level output current -3 -3 mA 24 mA TA Operating free-air temperature 70 C High-level input voltage 2 2 Low-level output current V 20 -55 125 V 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH SN54F251B TYP MAX TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V VCC = 4.75 V, MIN II = - 18 mA IOH = - 1 mA SN74F251B TYP MAX MIN -1.2 IOH = - 3 mA IOH = - 1 mA to - 3 mA -1.2 2.5 3.4 2.5 3.4 2.4 3.3 2.4 3.3 V VCC = 4.5 V IOL = 20 mA IOL = 24 mA 0.3 0.5 IOZH IOZL VCC = 5.5 V, VCC = 5.5 V, VO = 2.7 V VO = 0.5 V II IIH VCC = 5.5 V, VCC = 5.5 V, VI = 7 V VI = 2.7 V IIL IOS VCC = 5.5 V, VCC = 5.5 V, VI = 0.5 V VO = 0 VCC = 5.5 V, See Note 2 Condition A 15 22 15 22 Condition B 16 24 16 24 0.35 * POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443 * V 50 50 A -50 A 0.1 0.1 mA 20 20 A - 0.6 mA -150 mA - 0.6 -60 0.5 -50 -150 -60 All typical values are at VCC = 5 V, TA = 25C. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. NOTE 2: ICC is measured with the outputs open under the following conditions: A. Select input and data input at 4.5 V, output control grounded B. All inputs at 4.5 V 2-4 V 2.7 VOL ICC UNIT mA SDFS066A - MARCH 1987 - REVISED OCTOBER 1993 switching characteristics (see Note 3) PARAMETER FROM (INPUT) VCC = 5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = 25C TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX F251B tPLH tPHL A, B, or C W tPLH tPHL A, B, or C Y tPLH tPHL Any D W tPLH tPHL Any D Y tPZH tPZL G W tPHZ tPLZ G W tPZH tPZL G Y tPHZ tPLZ G Y MIN TYP 3.5 2.5 SN54F251B UNIT SN74F251B MAX MIN MAX MIN MAX 5.4 9 3.5 11.5 3.5 9.5 4.4 7.5 2.5 8 2.5 7.5 4.5 6.2 10.5 3.5 14 4 12.5 4 6 8.5 3 10.9 3.5 9 2.5 3.7 6.5 1.8 8 2 7 1 1.9 4 1 6 1 5 3 3.8 7 2.3 9 2.3 8 3 4.5 7 2.3 9 2.5 8 2.5 3.6 6 2 7 2 7 2.5 3.8 6 2.5 7.5 2.5 6.5 1.9 2.5 5.5 1.4 6 1.5 6 1 2.4 4.5 1 5 1 4.5 3.4 4.8 7 2.7 8.5 2.9 8.5 2.9 4 7.5 2.6 9 2.6 8 1.9 2.5 5.5 1.7 5.5 1.8 5.5 1 2.3 4.5 1 5.5 1 4.5 ns ns ns ns ns ns ns ns For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 3: Load circuits and waveforms are shown in Section 1. * POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443 * 2-5 SDFS066A - MARCH 1987 - REVISED OCTOBER 1993 2-6 * POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251-1443 * IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI's terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI's standard warranty. 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