ucn5821 Allegro MicroSystems, Inc., ucn5821 Datasheet - Page 4

• Manufacturer Part Number: ucn5821
• Description: Bimos Ii 8-bit Serial-input, Latched Drivers
• Manufacturer: Allegro MicroSystems, Inc.

STROBE
OUTPUT
ENABLE
A. Minimum Data Active Time Before Clock Pulse
B. Minimum Data Active Time After Clock Pulse
C. Minimum Data Pulse Width .............................................................. 150 ns
D. Minimum Clock Pulse Width ............................................................ 150 ns
E. Minimum Time Between Clock Activation and Strobe ....................... 30 ns
F.
G. Typical Time Between Strobe Activation and
DATA IN
CLOCK
Serial
Data
Input Input I
(V
5821
8-BIT SERIAL-INPUT,
LATCHED DRIVERS
H
L
X
L = Low Logic Level
OUT
DD
Minimum Strobe Pulse Width ........................................................... 100 ns
N
(Data Set-Up Time) ....................................................................... 75 ns
(Data Hold Time) ........................................................................... 75 ns
Output Transition .......................................................................... 1.0 s
= 5.0 V, T
Clock
AND
A
H
L
R
X
P
1
1
1
Shift Register Contents
C
A
B
I
R
R
R
X
P
5822
2
= +25 C, Logic Levels are V
2
1
1
2
TIMING CONDITIONS
D
H = High Logic Level
I
R
R
R
X
P
3
3
2
2
3
E
.............. I
.............. R
.............. R
.............. R
.............. X
.............. P
F
G
8
8
7
7
8
Output
Serial
Data
X = Irrelevant
R
R
R
X
P
8
7
7
8
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Strobe
Input
DD
TRUTH TABLE
H
L
and Ground)
P = Present State
Dwg. No. A-12,627
I
R
P
X
1
1
1
Latch Contents
I
R
P
X
2
2
2
I
R
P
X
3
3
3
.............. I
.............. R
.............. P
.............. X
R = Previous State
8
8
8
Output
Enable
H
L
I
P
H H H ..............
1
1
I
P
Output Contents
2
2
I
P
3
3
..............
.............. P
I
H
8
8