hef4894b NXP Semiconductors, hef4894b Datasheet - Page 2

• Manufacturer Part Number: hef4894b
• Description: 12-stage Shift-and-store Register Led Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATIONS
GENERAL DESCRIPTION
The HEF4894B is a 12 stage serial
shift register having a storage latch
associated with each stage for
strobing data from the serial input to
parallel LED driver outputs O
O
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 (O
available for cascading a number of
HEF4894B devices. Data is available
at O
allow high-speed operation in
cascaded systems in which the clock
rise time is fast. The same serial
information is available at O
next negative-going clock edge and
provides cascading HEF4894B
devices when the clock rise time is
slow.
January 1995
11
Automotive
Industrial
12-stage shift-and-store register LED driver
Preliminary pin assignment.
. Data is shifted on positive-going
s
on positive-going clock edges to
Fig.1 Pinning diagram.
s
and O
s
’ on the
0
s
’) are
to
ORDERING AND PACKAGE INFORMATION
PINNING
FAMILY DATA
See Family Specifications except for:
Rating for DC current into any open-drain output: 40 mA.
I
DD
1
2
3
4, 5, 6, 7, 8, 9, 18,
17, 16, 15, 14, 13
10
11, 12
19
20
HEF4894BT
HEF4894BP
LIMITS category MSI: see Family Specifications.
NUMBER
TYPE
PIN
2
PINS
20
20
STR
D
CP
O
V
O
EO
V
ss
DD
0
s
SYMBOL
, O
to O
s
PIN POSITION
’
11
SO
DIL
Fig.2 Functional diagram.
strobe input
data input
clock input
parallel outputs (open drain)
ground
serial outputs
output enable input
positive supply voltage
PACKAGES
NAME AND FUNCTION
MATERIAL
plastic
plastic
Product specification
HEF4894B
SO20/SOT163A
DIL20/SOT146
CODE