1. General description
The HEF4794B-Q100 is an 8-stage serial shift register. It has a storage latch associated with each
stage for strobing data from the serial input (D) to the parallel LED driver outputs (QP0 to QP7).
Data is shifted on the positive-going clock (CP) transitions. The data in each shift register stage
is transferred to the storage register when the strobe input (STR) is HIGH. Data in the storage
register appears at the outputs whenever the output enable input (OE) signal is HIGH.
Two serial outputs (QS1 and QS2) are available for cascading a number of HEF4794B-Q100
devices. Serial data is available at QS1 on positive-going clock edges to allow high-speed
operation in cascaded systems with a fast clock rise time. The same serial data is available at QS2
on the next negative going clock edge. This is used for cascading HEF4794B-Q100 devices when
the clock has a slow rise time.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually
ground). Unused inputs must be connected to VDD, VSS, or another input.
This product has been qualified to the Automotive Electronics Council (AEC) standard Q100
(Grade 1) and is suitable for use in automotive applications.
2. Features and benefits
• Automotive product qualification in accordance with AEC-Q100 (Grade 1)
• Specified from -40 °C to +85 °C and from -40 °C to +125 °C
• Fully static operation
• 5 V, 10 V, and 15 V parametric ratings
• Standardized symmetrical output characteristics
• ESD protection:
• MIL-STD-883, method 3015 exceeds 2000 V
• HBM JESD22-A114F exceeds 2000 V
• MM JESD22-A115-A exceeds 200 V (C = 200 pF; R = 0 Ω)
• Complies with JEDEC standard JESD 13-B