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 V
DD
power supply range of 3 V to 15 V referenced to V
SS
(usually ground). Connect unused inputs to V
DD
, V
SS
, 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-833, method 3015 exceeds 2000 V
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V (C = 200 pF, R = 0 )
Complies with JEDEC standard JESD 13-B
3. Ordering information
HEF4794B-Q100
8-stage shift-and-store register LED driver
Rev. 1 — 7 August 2012 Product data sheet
Table 1. Ordering information
All types operate from
40
C to +125
C.
Type number Package
Name Description Version
HEF4794BT-Q100 SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
