SN74HCT74NSR,SN74HCT74NSR,SN74HCT74NSR,SN74HCT74D,SN74HCT74PWT, 规格书,Datasheet 资料.pdfVIP

SCLS169E − DECEMBER 1982 − REVISED APRIL 2004 Operating Voltage Range of 4.5 V to 5.5 V SN54HCT74 . . . J OR W PACKAGE SN74HCT74 . . . D, DB, N, NS, OR PW PACKAGE Outputs Can Drive Up To 10 LSTTL Loads (TOP VIEW) Low Power Consumption, 40-µA Max ICC Typical tpd = 17 ns 1CLR 1 14 VCC ±4-mA Output Drive at 5 V 1D 2 13 2CLR 1CLK 3 12 2D Low Input Current of 1 µA Max 1PRE 4 11 2CLK Inputs Are TTL-Voltage Compatible 1Q 5 10 2PRE 1Q 6 9 2Q description/ordering information GND 7 8 2Q The ’HCT74 devices contain two independent D-type positive-edge-triggered flip-flops. A low SN54HCT74 . . . FK PACKAGE level at the preset (PRE) or clear (CLR) inputs sets (TOP VIEW) or resets the outputs, regardless of the levels of R R L C L the other inputs. When PRE and CLR are inactive D C C C C