SN54F251B, SN74F251B 1-OF-8 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

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1 -State Versio of SNFB and SNFB -State Outputs Interface Directly ith System Bus Performs Parallel-to-Serial onversion omplementary Outputs Provide True and Inverted Data Package Optio Include Plastic Small-Outline Packages, eramic hip arriers, and Standard Plastic and eramic 00-mil DIPs description These data selectors/multiplexers contain full binary decoding to select one of eight data sources and feature strobe-controlled complementary outputs. The -state outputs can interface with and drive data lines of busorganized systems. hen the strobe () input is high, both outputs are in a high-impedance state in which both the upper and lower traistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly. The SNFB is characterized for operation over the full military temperature range of to. The SNFB is characterized for operation from 0 to 0. SNFB...J PKE SNFB...D OR N PKE (TOP VIE) ND V D D D D B SNFB... FK PKE (TOP VIE) N ND N N V B D N No internal connection D D N D FUNTION TBLE INPUTS SELET STROBE OUTPUTS B X X X H Z Z L L L L L L H L L H L L L H H L H L L L D D H L H L D D H H L L D D H H H L D D,,... D = the level of the respective D input. PRODUTION DT information is current as of publication date. Products conform to specificatio per the terms of Texas Itruments standard warranty. Production processing does not necessarily include testing of all parameters. opyright 99, Texas Itruments Incorporated POST OFFIE BOX 0 DLLS, TEXS

2 logic symbol B D D D D 0 9 EN 0 0 MUX 0 This symbol is in accordance with NSI/IEEE Std 9-98 and IE Publication -. Pin numbers shown are for the D, J, and N packages. POST OFFIE BOX 0 DLLS, TEXS

3 logic diagram (positive logic) Data Inputs D D D D Data Select (Binary) B 0 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, V V to V Input voltage range (see Note ) V to V Input current range m to m Voltage range applied to any output in the disabled or power-off state V to. V Voltage range applied to any output in the high state V to V urrent into any output in the low state: SNFB m SNFB m Operating free-air temperature range: SNFB to SNFB to 0 Storage temperature range to 0 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 conditio beyond those indicated under recommended operating conditio is not implied. Exposure to absolute-maximum-rated conditio for extended periods may affect device reliability. NOTE : The input voltage ratings may be exceeded provided the input current ratings are observed. POST OFFIE BOX 0 DLLS, TEXS

4 recommended operating conditio SNFB SNFB MIN NOM MX MIN NOM MX V Supply voltage.... V VIH High-level input voltage V VIL Low-level input voltage V IIK Input clamp current 8 8 m IOH High-level output current m IOL Low-level output current 0 m T Operating free-air temperature 0 0 UNIT electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PRMETER TEST ONDITIONS SNFB SNFB MIN TP MX MIN TP MX VIK V =. V, II = 8 m.. V VOH V =V. VOL V =V. IOH = m.... IOH = m.... V V =. V, IOH = m to m. IOL = 0 m IOL = m IOZH V =. V, VO =. V 0 0 µ IOZL V =. V, VO = 0. V 0 0 µ II V =. V, VI = V m IIH V =. V, VI =. V 0 0 µ IIL V =. V, VI = 0. V m IOS V =. V, VO = m I V =. V, ondition See Note ondition B ll typical values are at V = V, T =. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. NOTE : I is measured with the outputs open under the following conditio:. Select input and data input at. V, output control grounded B. ll inputs at. V UNIT V m POST OFFIE BOX 0 DLLS, TEXS

5 switching characteristics (see Note ) PRMETER tpzh tpzl tphz tplz tpzh tpzl tphz FROM (INPUT) TO (OUTPUT), B, or, B, or ny D ny D V = V, L = 0 pf, R = 00 Ω, R = 00 Ω, T = V =. V to. V, L = 0 pf, R = 00 Ω, R = 00 Ω, T = MIN to MX FB SNFB SNFB MIN TP MX MIN MX MIN MX tplz For conditio shown as MIN or MX, use the appropriate value specified under recommended operating conditio. NOTE : Load circuits and waveforms are shown in Section..... UNIT POST OFFIE BOX 0 DLLS, TEXS

6 POST OFFIE BOX 0 DLLS, TEXS

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