INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: * The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications * The IC06 74HC/HCT/HCU/HCMOS Logic Package Information * The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT251 8-input multiplexer; 3-state Product specification File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification 8-input multiplexer; 3-state 74HC/HCT251 The 74HC/HCT251 are the logic implementations of single-pole 8-position switches with the state of three select inputs (S0, S1, S2) controlling the switch positions. Assertion (Y) and negation (Y) outputs are both provided. The output enable input (OE) is active LOW. The logic function provided at the output, when activated, is: FEATURES * True and complement outputs * Both outputs are 3-state for further multiplexer expansion * Multifunction capability * Permits multiplexing from n-lines to one line Y = OE.(I0.S0.S1.S2 + I1.S0.S1.S2 + + I2.S0.S1.S2 + I3.S0.S1.S2 + + I4.S0.S1.S2 + I5.S0.S1.S2 + + I6.S0.S1.S2 + I7.S0.S1.S2) * Output capability: standard * ICC category: MSI Both outputs are in the high impedance OFF-state (Z) when the output enable input is HIGH, allowing multiplexer expansion by tying the outputs. GENERAL DESCRIPTION The 74HC/HCT251 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. QUICK REFERENCE DATA GND = 0 V; Tamb = 25 C; tr = tf = 6 ns TYPICAL SYMBOL PARAMETER CONDITIONS UNIT HC tPHL/ tPLH propagation delay CL = 15 pF; VCC = 5 V In to Y 15 19 ns In to Y 17 19 ns Sn to Y 20 20 ns Sn to Y 21 21 ns 3.5 3.5 pF 44 46 pF CI input capacitance CPD power dissipation capacitance per package notes 1 and 2 Notes 1. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD x VCC2 x fi + (CL x VCC2 x fo) where: fi = input frequency in MHz fo = output frequency in MHz (CL x VCC2 x fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC - 1.5 V ORDERING INFORMATION See "74HC/HCT/HCU/HCMOS Logic Package Information". December 1990 HCT 2 Philips Semiconductors Product specification 8-input multiplexer; 3-state 74HC/HCT251 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 4, 3, 2, 1, 15, 14, 13, 12 I0 to I7 multiplexer inputs 5 Y multiplexer output 6 Y complementary multiplexer output 7 OE 3-state output enable input (active LOW) 8 GND ground (0 V) 11, 10, 9 S0, S1, S2 select inputs 16 VCC positive supply voltage Fig.1 Pin configuration. December 1990 Fig.2 Logic symbol. 3 Fig.3 IEC logic symbol. Philips Semiconductors Product specification 8-input multiplexer; 3-state 74HC/HCT251 FUNCTION TABLE INPUTS OUTPUTS OE S2 S1 S0 I0 I1 I2 I3 I4 I5 I6 I7 Y Y H X X X X X X X X X X X Z Z L L L L L L L L L L L L L L H H L H X X X X L H X X X X X X X X X X X X X X X X X X X X X X X X H L H L L H L H L L L L L L L L H H H H L L H H X X X X X X X X L H X X X X L H X X X X X X X X X X X X X X X X H L H L L H L H L L L L H H H H L L L L L L H H X X X X X X X X X X X X X X X X L H X X X X L H X X X X X X X X H L H L L H L H L L L L H H H H H H H H L L H H X X X X X X X X X X X X X X X X X X X X X X X X L H X X X X L H H L H L L H L H Note 1. H = HIGH voltage level L = LOW voltage level X = don't care Z = high impedance OFF-state Fig.4 Functional diagram. December 1990 Fig.5 Logic diagram. 4 Philips Semiconductors Product specification 8-input multiplexer; 3-state 74HC/HCT251 DC CHARACTERISTICS FOR 74HC For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) TEST CONDITIONS 74HC SYMBOL PARAMETER +25 -40 to +85 min. typ. max. min. max. -40 to +125 UNIT V WAVEFORMS CC (V) min. max. tPHL/ tPLH propagation delay In to Y 50 18 14 170 34 29 215 43 37 255 51 43 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay In to Y 55 20 16 175 35 30 220 44 37 265 53 45 ns 2.0 4.5 6.0 Fig.7 tPHL/ tPLH propagation delay Sn to Y 66 24 19 205 41 35 255 51 43 310 62 53 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay Sn to Y 69 25 20 205 41 35 255 51 43 310 62 53 ns 2.0 4.5 6.0 Fig.7 tPZH/ tPZL 3-state output enable time OE to Y, Y 36 13 10 140 28 24 175 35 30 210 42 36 ns 2.0 4.5 6.0 Fig.7 tPHZ/ tPLZ 3-state output disable time OE to Y, Y 39 14 11 140 28 24 170 35 30 210 42 36 ns 2.0 4.5 6.0 Fig.7 tTHL/ tTLH output transition time 19 7 6 75 15 13 95 19 16 110 22 19 ns 2.0 4.5 6.0 Figs 6 and 7 December 1990 5 Philips Semiconductors Product specification 8-input multiplexer; 3-state 74HC/HCT251 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI Note to HCT types The value of additional quiescent supply current (ICC) for a unit load of 1 is given in the family specifications. To determine ICC per input, multiply this value by the unit load coefficient shown in the table below. INPUT UNIT LOAD COEFFICIENT In S0 S1, S2 OE 1.00 1.50 1.50 1.50 AC CHARACTERISTICS FOR HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) TEST CONDITIONS 74HCT SYMBOL PARAMETER +25 min. typ. -40 to +85 -40 to +125 UNIT V WAVEFORMS CC (V) max. min. max. min. max. tPHL/ tPLH propagation delay In to Y 22 35 44 53 ns 4.5 Fig.6 tPHL/ tPLH propagation delay In to Y 22 35 44 53 ns 4.5 Fig.7 tPHL/ tPLH propagation delay Sn to Y 24 44 55 66 ns 4.5 Fig.6 tPHL/ tPLH propagation delay Sn to Y 25 44 55 66 ns 4.5 Fig.7 tPZH/ tPZL 3-state output enable time OE to Y, Y 13 28 35 42 ns 4.5 Fig.7 tPHZ/ tPLZ 3-state output disable time OE to Y, Y 14 28 35 42 ns 4.5 Fig.7 tTHL/ tTLH output transition time 7 15 19 22 ns 4.5 Figs 6 and 7 December 1990 6 Philips Semiconductors Product specification 8-input multiplexer; 3-state 74HC/HCT251 AC WAVEFORMS (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3V; VI = GND to 3 V. Fig.6 Waveforms showing the multiplexer input (In) and select input (Sn) to output (Y) propagation delays and the output transition times. (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3V; VI = GND to 3 V. Fig.7 Waveforms showing the multiplexer input (In) and select input (Sn) to output (Y) propagation delays and the output transition times. (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3V; VI = GND to 3 V. Fig.8 Waveforms showing the 3-state enable and disable times. PACKAGE OUTLINES See "74HC/HCT/HCU/HCMOS Logic Package Outlines". December 1990 7 Philips Semiconductors - PIP - 74HC/HCT251; 8-input multiplexer; 3-state Submit Query Philips Semiconductors Home ProductBuy MySemiconductors ContactProduct Information catalogonline Information as of 2003-04-22 74HC/HCT251; 8My.Semiconductors.COM. personal service from Use right mouse button to input multiplexer; 3- Your download datasheet Philips Semiconductors. Please register now ! Download datasheet state Stay informed Products General description MultiMarket * Semiconductors * Product Selector Catalog by * Function Catalog by * System * Cross-reference * Packages End of Life * information Distributors Go * Here! * Models * SoC solutions Block diagram Products & packages Features Buy online Parametrics Datasheet Email/translate Applications Support & tools Similar products General description top The 74HC/HCT251 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT251 are the logic implementations of single-pole 8-position switches with the state of three select inputs (S0,S1,S2) controlling the switch positions. Assertion (Y) and negation (Y) outputs are both provided. The output enable input (OE) is active LOW. The logic function provided at the output, when activated, is: Y =OE.(I0.S0.S1.S2 + I1.S0.S1.S2 + + I2.S0.S1.S2 + I3.S0.S1.S2 + + I4.S0.S1.S2 + I5.S0.S1.S2 + + I6.S0.S1.S2 + I7.S0.S1.S2) Both outputs are in the high impedance OFF-state (Z) when the output enable input is HIGH, allowing multiplexer expansion by tying the outputs. Features top True and complement outputs Both outputs are 3-state for further multiplexer expansion Multifunction capability Permits multiplexing from n-lines to one line Output capability: standard ICC category: MSI Datasheet top Type number Title Publication release date Datasheet status Page count File size (kB) Datasheet 74HC/HCT251 8-input multiplexer; 3state 12/1/1990 Product specification 7 51 Download Download PDF File Additional datasheet info To complete the device datasheet with package and family information, also download the following PDF files. The file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74HC251N.html (1 of 4) [Apr-29-2003 1:51:56 PM] Philips Semiconductors - PIP - 74HC/HCT251; 8-input multiplexer; 3-state "Logic Package Information" document is required to determine in which package(s) this device is available. Document Description 1 Download HCT_FAMILY_SPECIFICATIONS PDF 2 Download File HCT_PACKAGE_INFO PDF 3 Download File HCT_PACKAGE_OUTLINES PDF File HC/T Family Specifications, The IC06 74HC/HCT/HCMOS Logic Family Specifications HC/T Package Info, The IC06 74HC/HCT/HCMOS Logic Package Information HC/T Package Outlines, The IC06 74HC/HCT/HCMOS Logic Package Outlines Parametrics top Type number Package Description Propagation Voltage No. Power Logic Output Delay(ns) of Dissipation Switching Drive Pins Considerations Levels Capability 74HC251D SOT109 (SO16) 8-Input Multiplexer 15 (3-State) 5 Volts 16 + Low Power or Battery Applications CMOS Low 74HC251DB SOT338-1 (SSOP16) 8-Input Multiplexer 15 (3-State) 5 Volts 16 + Low Power or Battery Applications CMOS Low 74HC251N SOT38-1 (DIP16) 8-Input Multiplexer 15 (3-State) 5 Volts 16 + Low Power or Battery Applications CMOS Low 74HC251PW 8-Input SOT403-1 Multiplexer 15 (TSSOP16) (3-State) 5 Volts 16 + Low Power or Battery Applications CMOS Low 74HCT251D 8-Input Multiplexer (3-State); 15 TTL Enabled 5 Volts 16 + Low Power or Battery Applications TTL Low 8-Input Multiplexer (3-State); 15 TTL Enabled 5 Volts 16 + Low Power or Battery Applications TTL Low 8-Input Multiplexer (3-State); 15 TTL Enabled 5 Volts 16 + Low Power or Battery Applications TTL Low 8-Input Multiplexer SOT403-1 74HCT251PW (3-State); 15 (TSSOP16) TTL Enabled 5 Volts 16 + Low Power or Battery Applications TTL Low SOT109 (SO16) SOT338-1 74HCT251DB (SSOP16) 74HCT251N SOT38-1 (DIP16) file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74HC251N.html (2 of 4) [Apr-29-2003 1:51:56 PM] Philips Semiconductors - PIP - 74HC/HCT251; 8-input multiplexer; 3-state Products, packages, availability and ordering top Type number North Ordering code Marking/Packing Package Device status Buy online Discretes American type (12NC) Download packing info number PDF File Standard Marking SOT109 74HC251D 74HC251D 9337 135 20652 * Bulk Pack, Full production order this (SO16) CECC product Standard Marking online SOT109 74HC251D-T 9337 135 20653 * Reel Pack, Full production order this (SO16) SMD, 13", CECC product Standard Marking SOT338-1 74HC251DB 74HC251DB 9351 886 50112 Full production online order this (SSOP16) * Bulk Pack product Standard Marking SOT338-1 74HC251DB9351 886 50118 * Reel Pack, Full production online order this (SSOP16) T SMD, 13" product Standard Marking online SOT38-1 74HC251N 74HC251N 9336 695 30652 * Bulk Pack, Full production order this (DIP16) CECC product SOT403-1 online Standard Marking 74HC251PW 74HC251PW 9351 883 90112 (TSSOP16) Full production order this * Bulk Pack product Standard Marking SOT403-1 online 74HC251PW9351 883 90118 * Reel Pack, (TSSOP16) Full production order this T SMD, 13" product Standard Marking online SOT109 74HCT251D 74HCT251D 9337 135 30652 * Bulk Pack, Full production order this (SO16) CECC product Standard Marking online SOT109 74HCT251D9337 135 30653 * Reel Pack, Full production order this (SO16) T SMD, 13", CECC product Standard Marking SOT338-1 74HCT251DB 74HCT251DB 9351 886 40112 Full production online order this (SSOP16) * Bulk Pack product Standard Marking SOT338-1 74HCT251DB9351 886 40118 * Reel Pack, Full production online order this (SSOP16) T SMD, 13" product Standard Marking online SOT38-1 74HCT251N 74HCT251N 9336 701 60652 * Bulk Pack, Full production order this (DIP16) CECC product SOT403-1 online Standard Marking 74HCT251PW 74HCT251PW 9351 883 80112 (TSSOP16) Full production order this * Bulk Pack product Standard Marking SOT403-1 online 74HCT251PW9351 883 80118 * Reel Pack, (TSSOP16) Full production order this T SMD, 13" product online Products in the above table are all in production. Some variants are discontinued; click here for information on these variants. file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74HC251N.html (3 of 4) [Apr-29-2003 1:51:56 PM] Philips Semiconductors - PIP - 74HC/HCT251; 8-input multiplexer; 3-state Similar products top 74HC/HCT251 links to the similar products page containing an overview of products that are similar in Products function similar or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category. to 74HC/HCT251 Support & tools top HC/T Family Specifications, The IC06 74HC/HCT/HCMOS Logic Family Specifications(date 01-Mar-98) Download Download PDF HC/T User Guide(date 01-Nov-97) PDF File File Email/translate this product information top Email this product information. Translate this product information page from English to: French Translate The English language is the official language used at the semiconductors.philips.com website and webpages. All translations on this website are created through the use of Google Language Tools and are provided for convenience purposes only. No rights can be derived from any translation on this website. About this Web Site | Copyright (c) 2003 Koninklijke Philips N.V. All rights reserved. | Privacy Policy | | Koninklijke Philips N.V. | Access to and use of this Web Site is subject to the following Terms of Use. | file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74HC251N.html (4 of 4) [Apr-29-2003 1:51:56 PM]