HT74164 Datasheet | Holtek Semiconductor

Features - Operating voltage: 2.0V~6.0V - A 8-bit, serial-input to parallel-output shift register - Gated serial data inputs - Asynchronous master reset - Output drive capability: 10 LSTTL Loads - Outputs Directly Interface to CMOS - High noise immunity characteristic of CMOS Devices. - 14-pin DIP/SOP package General Description The HT74164 is identical in pin-out to the LS164. The device inputs are patible with standard CMOS outputs; with pull-up resistors, they are patible with LSTTL outputs. The HT74164 is a 8-bit, serial input to parallel-output shift register. Two serial data inputs, A1 and A2, are provided so that one input may be used as a data enable. Data is entered on each rising edge of the clock. The active low asynchronous reset overrides the Clock and Serial Data inputs. Block Diagram V D D A 1 A 2 R E S E T C L O C K V S S Q A Q B Q C Q D Q E Q F Q G Q H Q A ~ Q H : P a r a lle l D a ta O u tp u ts Pin Assignment A 1 1 2 3 4 5 6 7 8 A 2 Q A Q B Q C Q D V S S 1 4 1 3 1 2 1 1 1 0 9 V D D Q H Q G Q F Q E R E S E T C L O C K H T 7 4 1 6 4 1 4 D IP -A /S O P -A Rev. 1.10 March 30, 2009 Free Datasheet http://.. Pin Description Pad No. Pad Name I/O Function Serial Data Inputs. Data at these inputs determine the data to be entered into the first stage of the shift register. For a high level to be entered into the shift register both A1 and A2 inputs must be high, thereby allowing one input to be used as a data enable input. When only one serial input is used, the other must be connected to VDD. Parallel Shift Register Outputs. The shifted data is presented at these outputs in true, or non-inverted form. Negative power supply, ground Shift Register Clock. A positive going transition on this pin shifts the data at each stage to the next stage. The shift register is pletely static, allowing clock rates down to DC in a continuous or intermittent mode. Active low, Asynchronous Reset Input. A low voltage applied to this input resets all...