Diodes 74HCT594 User Manual
Description, Pin assignments, Features
74HCT594
Document number: DS35491 Rev. 2 - 2
1 of 12
June 2013
© Diodes Incorporated
74HCT594
8-BIT SHIFT REGISTER WITH 8-BIT OUTPUT REGISTER
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. Se information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and < 1000 ppm antimony compounds.
Click for Ordering Information
Description
The 74HCT594 is a high speed CMOS device that is designed to be
pin compatable with 74LS low power Schottky types.
An eight bit shift register accepts data from the serial input (DS) on
each positive transition of the shift register clock (SHCP). When
asserted low the shift register reset function (SHR) sets all shift
register values to zero and is independent of all clocks. Also when
asserted low the storage register reset function (STR) sets all shift
register values to zero and is independent of all clocks
Data from the input serial shift register is placed in the output
register with a rising pulse on the storages resister clock (STCP).
The storage resister includes output Q7S which is used for
cascading information between devices. As the information moves
into the storage register, it is asserted on the push-pull outputs Q0-
Q7.
All registers capture data on rising edge and change output on the
falling edge. If both clocks are connected together, the input shift
register is always one clock cycle ahead of the output register.
Pin Assignments
Features
• Wide Supply Voltage Range from 4.5V to 5.5V
• Sinks or sources 8mA at V
CC
= 4.5V
• CMOS low power consumption
• Schmitt Trigger Action at All Inputs
• Inputs accept up to 6.0V
• ESD Protection Tested per JESD 22
Exceeds 200-V Machine Model (A115-A)
Exceeds 2000-V Human Body Model (A114-A)
Exceeds 1000-V Charged Device Model (C101C)
• Latch-Up Exceeds 250mA per JESD 78, Class II
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• General Purpose Logic
• Serial to Parallel Data conversion
• Capture and hold data for extended periods of time.
• Allow simple serial bit streams from a microcontroller to
control as many peripheral lines as needed.
• Wide array of products such as:
o
Computer
peripherals
o
Appliances
o
Industrial control