M74HC164 Datasheet | STMicroelectronics

DESCRIPTION s The M74HC164 is an high speed CMOS 8 BIT b SIPO SHIFT REGISTER fabricated with silicon O gate C2MOS technology. - The M74HC164 is an 8 bit shift register with serial t(s) data entry and an output from each of the eight stages. Data is entered serially through one of two c inputs (A or B), either of these inputs can be used u as an active high enable for data entry through the d other input. An unused input must be high, or both ro inputs connected together. Each low-to-high TSSOP ORDER CODES PACKAGE TUBE DIP SOP TSSOP M74HC164B1R M74HC164M1R T&R M74HC164RM13TR M74HC164TTR transition on the clock inputs shifts data one place to the right and enters into QA the logic NAND of the two data inputs (A x B), the data that existed before the rising clock edge. A low level on the clear input overrides all other inputs and clears the register asynchronously, forcing all Q outputs low. All inputs are equipped with protection circuits against static discharge and transient excess voltage. Obsolete P PIN CONNECTION AND IEC LOGIC SYMBOLS June 2003 1/13 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1,2 3, 4, 5, 6, 10, 11, 12, 13 9 7 14 SYMBOL A, B QA to QH CLOCK CLEAR GND Vcc NAME AND FUNCTION Data Inputs Outputs Clock Input (LOW to HIGH, Edge Triggered Master Reset Input Ground (0V) Positive Supply Voltage t(s) TRUTH TABLE c INPUTS OUTPUTS rodu CLEAR CLOCK SERIAL IN lete H NO CHANGE o...