5881
BiMOS II DUAL
8-BIT LATCHED DRIVER
5881
BiMOS II DUAL 8-BIT LATCHED
DRIVER WITH READ BACK
With 16 CMOS data latches (two sets of eight), CMOS control
circuitry for each set of latches, and a bipolar saturated driver for each
latch, the UCN5881EP provides low-power interface with maximum
flexibility. The driver includes thermal shutdown circuitry to protect
against damage from high junction temperatures and clamp diodes
for inductive load transient suppression.
The CMOS inputs cause minimal circuit loading and are compat-
ible with standard CMOS, PMOS, and NMOS circuits. TTL or DTL
circuits may require the use of appropriate pull up resistors. When
reading back, each data input will sink 8 mA (if its corresponding latch
is low) or source 400
µA
(if its corresponding latch is high). The read
back feature is for error checking. It allows the system to verify that
data has been received and latched.
The bipolar outputs are suitable for use with low-power relays,
solenoids, and stepping motors. The very-low output saturation
voltage makes this device well-suited for driving LED arrays. The
output transistors are capable of sinking 50 mA and will maintain at
least 20 V in the OFF state. Outputs may be paralleled for higher
current capability.
Data Sheet
26180.16
ABSOLUTE MAXIMUM RATINGS
Output Voltage, V
OUT
. . . . . . . . . . . . . .
20 V
Output Sustaining Voltage, V
CE(sus)
. . .
15 V
Output Current, I
OUT
. . . . . . . . . . . .
50 mA
Input Voltage Range,
V
IN
. . . . . . . . . . .
-0.3 V to V
DD
+ 0.3 V
Logic Supply Voltage, V
DD
. . . . . . . . . .
15 V
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . .
See Graph
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . .
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-55
°
C to +150
°
C
Caution: CMOS devices have input static
protection, but are susceptible to damage when
exposed to extremely high static electrical
charges.
T
C
U Y
D L
O N
R O
P E
D C
E N
U E
N ER
I
T F
N E
O R
C R
S O
I
D F
—
Dwg. No. A-14,225
The UCN5881EP dual 8-bit latched sink driver is rated for opera-
tion over the temperature range of -20°C to +85°C and is supplied in a
plastic 44-lead chip carrier conforming to the JEDEC MS-007AB
outline.
FEATURES
s
s
s
s
s
s
4.4 MHz Minimum Data-Input Rate
Low-Power CMOS Logic
20 V, 50 mA (Max.) Outputs
Transient-Protected Outputs
Thermal Shutdown Protection
Low-Profile Leaded Chip Carrier
Always order by complete part number:
UCN5881EP .
5881
BiMOS II DUAL
8-BIT LATCHED DRIVER
FUNCTIONAL BLOCK DIAGRAM
(1 of 16 Channels)
Dwg. No. A-14,227
TRUTH TABLE
3.0
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
Read/ln Strobe Clear
2.5
Output
Enable
1
0
0
0
X
X
Latch
Read/Write Contents
X
1
1
1
X
0
X
0
1
n-1
0
n
Output
OFF
OFF
ON
n-1
OFF
n
2.0
1.5
R
θJA
= 46°C/W
X
0
1
X
X
n
X
1
1
0
X
X
X
0
0
0
1
0
1.0
n = Present Latch Contents
n-1 = Previous Latch Contents
X = Irrelevant
0.5
0
25
50
75
100
125
AMBIENT TEMPERATURE IN
°C
150
Dwg. GP-025-1A
115 Northeast Cutoff, Box 15036
W
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1985, 1995
,
Allegro MicroSystems, Inc.
5881
BiMOS II DUAL
8-BIT LATCHED DRIVER
ELECTRICAL CHARACTERISTICS at T
A
= 25
°
C, V
DD
= 5 V (unless otherwise noted).
Characteristic
Output Leakage Current
Output Saturation Voltage
Symbol
I
CEX
V
CE(SAT)
Test Conditions
V
OUT
= 20 V
I
OUT
= 10 mA
I
OUT
= 25 mA
Output Sustaining Voltage
Input Voltage
V
CE(sus)
V
IN(0)
V
IN(1)
Input Current
I
IN(0)
I
IN(1)
Readback Output Voltage
V
OUT(1)
V
OUT(0)
Logic Supply Current
l
DD
V
IN
= 0.8 V
V
IN
= 5 V
I
OUT
= -400
µA
I
OUT
= 5.0 mA
All Drivers ON
All Drivers OFF
Clamp Diode Leakage Current
Clamp Diode Forward Voltage
I
R
V
F
V
R
= 20 V
I
F
= 50 mA
I
OUT
= 25 mA, L = 2 mH
Min.
—
—
—
15
-0.3
3.5
—
—
3.5
—
—
—
—
—
Limits
Max.
50
0.1
0.5
—
0.8
5.3
-10
10
—
0.8
14
3.0
50
1.5
Units
µA
V
V
V
V
V
µA
µA
V
V
mA
mA
µA
V
Dwg. No. A-14,228
A high on the READ/WRITE input allows
the circuit to accept data in. Information then
present at an input is transferred to its latch
when the STROBE is high. A high CLEAR
input will set all latches to the output OFF
condition regardless of the data or STROBE
input levels. A high OUTPUT ENABLE will
set all outputs to the OFF condition regard-
less of any other input conditions. When the
OUTPUT ENABLE is low, the outputs de-
pend on the state of their respective latches.
A low on the READ/WRITE input will
allow the latched data to be read back on the
data input lines. Allow a minimum of 750 ns
delay (will increase with capacitive loading)
before reading back the state of the latches.
The read back feature is for error checking
applications and allows the system to verify
that data has been received and latched.
TIMING CONDITIONS
(V
DD
= 5.0 V, Logic Levels are V
DD
and Ground)
A.
Minimum Data Active Time Before Strobe Enabled
(Data Set-Up Time) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50 ns
B.
Minimum Data Active Time After Strobe Disabled
(Data Hold Time) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50 ns
C.
Minimum Strobe Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
125 ns
D.
Typical Time Between Strobe Activation and Output
ON to OFF Transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
µ
s
E.
Typical Time Between Strobe Activation and Output
OFF to ON Transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
500 ns
F.
Minimum Clear Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
225 ns
G.
Minimum Data Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
225 ns
5881
BiMOS II DUAL
8-BIT LATCHED DRIVER
Dimensions in Inches
(controlling dimensions)
28
18
29
0.319
0.291
0.021
0.013
0.695
0.685
0.656
0.650
0.319
0.291
0.050
BSC
INDEX AREA
17
0.032
0.026
39
7
40
0.020
MIN
44
1
2
6
0.656
0.650
0.695
0.685
Dwg. MA-005-44A in
0.180
0.165
Dimensions in Millimeters
(for reference only)
28
18
29
8.10
7.39
0.533
0.331
17.65
17.40
16.662
16.510
INDEX AREA
17
0.812
0.661
8.10
7.39
1.27
BSC
39
7
40
0.51
MIN
44
1
2
6
4.57
4.20
16.662
16.510
17.65
17.40
Dwg. MA-005-44A mm
NOTES: 1. Exact body and lead configuration at
vendor’s option within limits shown.
2. Lead spacing tolerance is non-cumulative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from
the detail specifications as may be required to permit improvements in the design of its products.
The information included herein is believed to be accurate and reliable. However, Allegro
MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or
other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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