74HCT688N,652

Important notice Dear Customer, On 7 February 2017 the former NXP Standard Product business became a new company with the tradename Nexperia. Nexperia is an industry leading supplier of Discrete, Logic and PowerMOS semiconductors with its focus on the automotive, industrial, computing, consumer and wearable application markets In data sheets and application notes which still contain NXP or Philips Semiconductors references, use the references to Nexperia, as shown below. Instead of http://www.nxp.com, http://www.philips.com/ or http://www.semiconductors.philips.com/, use http://www.nexperia.com Instead of sales.addresses@www.nxp.com or sales.addresses@www.semiconductors.philips.com, use salesaddresses@nexperia.com (email) Replace the copyright notice at the bottom of each page or elsewhere in the document, depending on the version, as shown below: - © NXP N.V. (year). All rights reserved or © Koninklijke Philips Electronics N.V. (year). All rights reserved Should be replaced with: - © Nexperia B.V. (year). All rights reserved. If you have any questions related to the data sheet, please contact our nearest sales office via e-mail or telephone (details via salesaddresses@nexperia.com). Thank you for your cooperation and understanding, Kind regards, Team Nexperia 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/HCT688 8-bit magnitude comparator Product specification File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification 8-bit magnitude comparator 74HC/HCT688 FEATURES GENERAL DESCRIPTION • Compare two 8-bit words The 74HC/HCT688 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. • Output capability: standard • ICC category: MSI The 74HC/HCT688 are 8-bit magnitude comparators. They perform comparison of two 8-bit binary or BCD words. The output provides P = Q. QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns TYPICAL SYMBOL tPHL/ tPLH PARAMETER CONDITIONS HCT Pn, Qn to P = Q 17 17 ns E to P = Q 8 12 ns 3.5 3.5 pF 30 30 pF propagation delay CL = 15 pF; VCC = 5 V 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 µW): PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × 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 UNIT HC 2 Philips Semiconductors Product specification 8-bit magnitude comparator 74HC/HCT688 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 1 E enable input (active LOW) 2, 4, 6, 8, 11, 13, 15, 17 P0 to P7 word inputs 3, 5, 7, 9, 12, 14, 16, 18 Q0 to Q7 word inputs 10 GND ground (0 V) 19 P=Q equal to output 20 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-bit magnitude comparator 74HC/HCT688 Fig.4 Functional diagram. Fig.5 Logic diagram. FUNCTION TABLE INPUTS OUTPUT DATA Pn, Qn ENABLE E P=Q P=Q X P>Q P