5890 AND 5891
8-BIT SERIAL-INPUT,
LATCHED SOURCE DRIVERS
FUNCTIONAL BLOCK DIAGRAM
2.5
2.0
CLOCK
SUFFIX 'A', R
= 60°C/W
θJA
SERIAL
DATA OUT
SERIAL
DATA IN
8-BIT SERIAL-PARALLEL SHIFT REGISTER
LATCHES
1.5
1.0
0.5
0
V
STROBE
GROUND
DD
OUTPUT
ENABLE
MOS
BIPOLAR
SUFFIX 'LW', R
= 80°C/W
θJA
V
BB
25
50
75
100
125
150
OUT OUT OUT OUT OUT OUT OUT OUT
8
Dwg. No. A-12,654
1
2
3
4
5
6
7
AMBIENT TEMPERATURE IN °C
Dwg. GP-018B
TYPICAL INPUT CIRCUIT
Number of
Outputs On at
UCN5890/91A Max. Allowable Duty Cycle
at TA of
V
DD
IOUT = -200 mA
50°C
60°C
70°C
8
7
6
5
4
3
2
1
53%
60%
70%
47%
54%
64%
75%
94%
100%
100%
100%
41%
48%
56%
67%
84%
100%
100%
100%
IN
83%
100%
100%
100%
100%
Dwg. EP-010-4A
TYPICAL OUTPUT DRIVER
V
BB
Number of
Outputs On at
UCN5890/91LW Max. Allowable Duty Cycle
at TA of
IOUT = -200 mA
50°C
60°C
70°C
8
7
6
5
4
3
2
1
40%
45%
53%
62%
80%
100%
100%
100%
35%
41%
48%
56%
71%
96%
100%
100%
31%
36%
42%
50%
62%
84%
100%
100%
OUT
Dwg. No. A-12,648
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1985, 2000 Allegro MicroSystems, Inc.
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
