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.
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
Philips Semiconductors Product specification 8-bit magnitude comparator 74HC/HCT688 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 min. tPHL/ tPLH tPHL/ tPLH tTHL/ tTLH −40 to +85 min. VCC WAVEFORMS (V) max.
Philips Semiconductors Product specification 8-bit magnitude comparator 74HC/HCT688 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.
Philips Semiconductors Product specification 8-bit magnitude comparator 74HC/HCT688 AC WAVEFORMS (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.6 Fig.7 Waveforms showing the enable input (E) to the equal to output (P = Q) propagation delays and the output transition times. Waveforms showing the word inputs (Pn, Qn) to the equal to output (P = Q) propagation delays and the output transition times.
