74ACT8244
RELAY DRIVER IC
s
s
s
s
s
s
OPERATES 4 LATCHES RELAIS, 1 SINGLE
SIDE STABLE RELAY AND 1 LED
VERY LOW POWER CONSUMPTION
TTL COMPATIBLE INPUT THRESHOLDS
IMPROVED LATCH-UP IMMUNITY UP TO
300mA
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 4.25V to 5.25V
AVAILABLE IN TSSOP-20 PACKAGE
ORDER CODES
PACKAGE
TSSOP
TSSOP
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(s
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P
t(
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o
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s
P
b
O
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so
b
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PIN DESCRIPTION
PIN No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SYMBOL
RST
IN1A
IN1B
IN2A
IN2B
IN3A
IN3B
IN4
IN5
GND
NC
OUT5
OUT4
OU3B
OU3A
OU2B
OU2A
OU1B
OU1A
V
CC
NAME AND FUNCTION
Master Reset
Input of 1st latched relay drv
Input of 1st latched relay drv
Input of 2nd latched relay drv
Input of 2nd latched relay drv
Input of 3rd latched relay drv
Input of 3rd latched relay drv
Input of 1st relay driver
Input LED driver
Ground (0V)
Not Connected
Output LED driver
Output of 1st relay driver
Output of 3rd latched relay drv
Output of 3rd latched relay drv
Output of 2nd latched relay drv
Output of 2nd latched relay drv
Output of 1st latched relay drv
Output of 1st latched relay drv
Positive Supply Voltage
DESCRIPTION
The device is a relais driver for line card
application. It is able to operate four latching
relais, one single side stable relay and one LED
connected either to GND or VCC. All the outputs
can be set to LOW with the RST input as shown in
the true table. All inputs and outputs are equipped
with protection circuits against static discharge,
giving them 2KV ESD immunity and transient
excess voltage.
PIN CONNECTION
b
O
so
te
le
ro
P
TUBE
uc
d
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t(
T&R
P
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t(
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74ACT8244TTR
June 2001
1/7
74ACT8244
DC SPECIFICATIONS
Value
Symbol
V
IH
V
IL
V
OH
V
OL
V
OH
V
OL
V
OH
V
OL
I
I
I
CCT
I
CC
Parameter
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
for Single Driver
Low Level Output Voltage for
Single Driver
High Level Output Voltage
for Double Relay Driver
Low Level Output Voltage for
Double Relay Driver
High Level Output Voltage
for Single Side Relay of LED
Low Level Output Voltage for
Single Side Relay of LED
Input Leakage Current
Max I
CC
/Input
Quiescent Supply Current
Test Condition
Min.
V
O
= 0.1 V or V
CC
-0.1V
V
O
= 0.1 V or V
CC
-0.1V
I
O
=-35mA
I
O
=35mA
I
O
=-70mA
I
O
=70mA
I
O
=-50mA
I
O
=50mA
V
I
= V
CC
or GND
V
I
= V
CC
- 2.1V
V
I
= V
CC
or GND
V
CC
-0.8
V
CC
-0.68
V
CC
-0.68
2.0
Typ.
1.4
1.4
V
CC
-0.3
0.25
V
CC
-0.3
0.25
V
CC
-0.4
0.3
0.68
0.68
0.8
Max.
V
V
V
V
V
Unit
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, R
L
= 500
Ω,
Input t
r
= t
f
= 3ns)
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et
l
)
(s
so
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P
t(
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P
b
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Symbol
Parameter
Test Condition
t
PLH
t
PHL
Propagation Delay Time
Over recommended operating
conditions
b
O
so
te
le
r
P
du
o
0.6
4
ct
0.8
1.5
40
s)
(
V
V
V
P
e
Min.
od
r
Value
Typ.
7.0
s)
t(
uc
±
0.1
Max.
11.0
µA
µA
mA
Unit
ns
TRUTH TABLE FOR LATCHING RELAY
DRIVER
INPUT
INnA
X
L
L
H
H
OUTPUT
TRUTH TABLE FOR SINGLE SIDE RELAY
INPUT
IN4
L
H
OUTPUT
OUT4
H
L
Condition
RST
H
L
L
L
L
INnB
X
L
H
L
H
OUnA OUnB
L
L
L
H
H
L
L
H
L
H
Storage
Storage
Operate
Release
Storage
TRUTH TABLE FOR LED DRIVER
INPUT
IN5
L
H
OUTPUT
OUT5
H
L
Z : High Impedance
X : Don’t Care
n : 1,2,3
3/7
74ACT8244
TYPICAL PERFORMANCE CHARACTERISTICS
(unless otherwise specified T
j
= 25°C)
Figure 1 :
Output Characteristics of a Double
Relay Driver N-channel with All Output Loaded
Figure 3 :
Output Characteristics of a Double
Relay Driver P-channel with All Output Loaded
Figure 2 :
Output Characteristics of a Single Side
Relay or Led Driver N-channel with All Output
Loaded
Figure 4 :
Output Characteristics of a Single Side
Relay or Led Driver P-channel with All Output
Loaded
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b
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P
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5/7
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