HEF4794B Просмотр технического описания (PDF) - Philips Electronics
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HEF4794B Datasheet PDF : 16 Pages
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Philips Semiconductors
8-stage shift-and-store register LED driver
Product specification
HEF4794B
APPLICATIONS
• Automotive
• Industrial.
GENERAL DESCRIPTION
The HEF4794B is an 8-stage serial shift register having a
storage latch associated with each stage for strobing data
from the serial input to parallel LED driver outputs
O0 to O7. Data is shifted on positive-going clock
transitions. The data in each shift register stage is
transferred to the storage register when the strobe (STR)
input is HIGH. Data in the storage register appears at the
outputs whenever the output enable (EO) signal is HIGH.
Two serial outputs (OS and OS') are available for
cascading a number of HEF4794B devices. Data is
available at OS on positive-going clock edges to allow
high-speed operation in cascaded systems in which the
clock rise time is fast. The same serial information is
available at OS' on the next negative-going clock edge and
provides cascading HEF4794B devices when the clock
rise time is slow.
ORDERING INFORMATION
TYPE NUMBER
HEF4794BT
HEF4794BP
PINS
16
16
PACKAGES
PIN POSITION
MATERIAL
SO16
DIP16
plastic
plastic
CODE
SOT109-1
SOT38-1
FUNCTIONAL DIAGRAM
LOGIC DIAGRAMS
VDD
16
D2
CP 3
HEF4794B
8-STAGE SHIFT
REGISTER
STR 1
8-BIT STORAGE
REGISTER
10 O S'
9 OS
handbook, halfpaDge
CP
EO 15
OPEN-DRAIN OUTPUTS
8 4 5 6 7 14 13 12 11
VSS O0 O1 O2 O3 O4 O5 O6 O7
MBD909
O
MBD912
Fig.1 Functional diagram.
Fig.2 One D-latch.
1999 Jun 30
2
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