HOLT INTEGRATED CIRCUITS
www.holtic.com
HI-8421, HI-8424
6-Channel / 8-Channel Discrete-to-Digital Interface
Sensing 28V / Open Signals
DESCRIPTION
FEATURES
PIN CONFIGURATIONS
The HI-8421 is a six channel discrete-to-digital interface
device.The HI-8424 has eight channels. Mixed-signal
CMOS technology is used to provide superior low-power
performance. The device inputs are configured to sense
28V / Open discrete signals. The device outputs are CMOS
/ TTL compatible and may be disabled (tri-state) using the
and
pins.
The HI-8421 is a drop-in replacement for the DEI1054.
For added functionality, the Holt HI-8422 offers eight
channels of Open / Ground sensing and eight channels of
28V / Ground sensing in a single device.
CE
OE
!
!
!
!
!
6 or 8 independent 28V / Open sensing channels
5.0V single supply operation
Low power CMOS technology
Lightning protected inputs to DO-160D level 3
HI-8421 is a drop in replacement for DEI1054
HI-8421PSI
HI-8421PST
IN1 1
IN2 2
IN3 3
IN4 4
IN5 5
IN6 6
7
8
OE
CE
16 GND
15 OUT1
14 OUT2
13 OUT3
12 OUT4
11 OUT5
10 OUT6
9 VDD
16-Pin Plastic SOIC package
(Narrow Body)
March 2003
(DS8421 Rev. A)
03/03
Discrete
Output
Input
Open
0
0
1
28 Volts
0
0
0
X
1
X
High Z
X
X
1
High Z
CE
OE
FUNCTION TABLE
BLOCK DIAGRAM
20 GND
19 OUT1
18 OUT2
17 OUT3
16 IN8
15 OUT4
14 OUT5
13 OUT6
12 OUT7
11 OUT8
IN1
1
IN2
2
IN3
3
IN4
4
IN5
5
IN6
6
IN7
7
8
9
VDD 10
OE
CE
HI-8424PSI
HI-8424PST
20 Pin SSOP package
+
-
OUT1
+
-
OUT2
+
-
OUT3
+
-
OUT4
+
-
OUT7
+
-
OUT8
OE
CE
V
DD
IN1
IN2
IN3
IN4
IN7
IN8
GND
66 K
29 K
66 K
29 K
66 K
29 K
66 K
29 K
66 K
29 K
66 K
29 K
3.6V Reference
+
-
OUT5
+
-
OUT6
IN5
IN6
29 K
66 K
29 K
66 K
PIN DESCRIPTIONS
HOLT INTEGRATED CIRCUITS
2
PIN
SYMBOL
FUNCTION
DESCRIPTION
(HI-8421)
(HI-8424)
1
1
IN1
Discrete Input
28 Volt / Open sensing input, channel 1
2
2
IN2
3
3
IN3
4
4
IN4
5
5
IN5
6
6
IN6
7
8
Digital
9
10
V
Power
-
11
OUT8
Tri-state output
-
12
OUT7
10
13
OUT6
11
14
OUT5
12
15
OUT4
-
16
Discrete Input
28 Volt / Open sensing input, channel 2
Discrete Input
28 Volt / Open sensing input, channel 3
Discrete Input
28 Volt / Open sensing input, channel 4
Discrete Input
28 Volt / Open sensing input, channel 5
Discrete Input
28 Volt / Open sensing input, channel 6
-
7
IN7
Discrete Input
28 Volt / Open sensing input channel 7
input
Output Enable. OUT1-OUT8 are high-impedance if
is high
8
9
Digital input
Chip Enable. OUT1-OUT8 are high-impedance if
is high
Positive supply voltage 5.0 V
Logic output, channel 8
Tri-state output
Logic output, channel 7
Tri-state output
Logic output, channel 6
Tri-state output
Logic output, channel 5
Tri-state output
Logic output, channel 4
IN8
Discrete Input
28 Volt / Open sensing input, channel 8
13
17
OUT3
Tri-state output
Logic output, channel 3
14
18
OUT2
Tri-state output
Logic output, channel 2
15
19
OUT1
Tri-state output
Logic output, channel 1
16
20
GND
Power
Ground
OE
OE
CE
CE
DD
NOTE:
Stresses above absolute maximum
ratings or outside recommended operating conditions may cause
permanent damage to the device. These are stress ratings only. Operation at the limits is not recommended.
Supply voltage (
Logic input voltage range
Power dissipation at 25C
350 mW
Solder temperature
275C for 10 sec
Storage temperature
-65C to +150C
VDD)
-0.3 V to +7 V
-0.3 V to +5.5 V
Discrete input voltage range
-5 V to + 35 V
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED
OPERATING CONDITIONS
Supply Voltage
Operating Temperature Range
Industrial Screening .........
-40C to +85C
Hi-Temp Screening ........
-55C to +125C
VDD .................................. 4.5 V to 5.5 V
ELECTRICAL CHARACTERISTICS
VDD = 5.0V
, GND = 0V, T = Operating Temperature Range (unless otherwise specified).
A
10%
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
DISCRETE INPUTS
Open state input voltage
V
Input voltage to give high output
-5
10
V
28 V state input voltage
V
Input voltage to give low output
14
V
Open state input current
I
Maximum input current
84
28 V state input current
I
Minimum input current
197
to give low output
Input resistance
R
0 V < V
< 16 V
71
119
K
Input current at 28 V
I
V
= 28 V
394
SO
S28
SO
S28
IN
IN
IN28
IN
A
to give high output
A
A
W
HI-8421, HI-8424
ELECTRICAL CHARACTERISTICS (Cont.)
VDD = 5.0V
, GND = 0V, T = Operating Temperature Range (unless otherwise specified).
A
10%
TIMING DIAGRAMS
t , t
ZL
ZH
CE
OE
or
OUTx
Output Enable Timing
PART
NUMBER
LEAD
FINISH
ORDERING INFORMATION
HI-8421PSI
16 PIN PLASTIC SOIC (NARROW BODY)
-40C TO +85C
I
NO
SOLDER
HI-8421PST
16 PIN PLASTIC SOIC (NARROW BODY)
-55C TO +125C
T
NO
SOLDER
HI-8424PSI
20 PIN PLASTIC SSOP
-40C TO +85C
I
NO
SOLDER
HI-8424PST
20 PIN PLASTIC SSOP
-55C TO +125C
T
NO
SOLDER
t , t
ZL
ZH
INx
t
HL
Input to Output Propagation Delay
OUTx
t
LH
HOLT INTEGRATED CIRCUITS
3
LIGHTNING PROTECTION
The 28V / Open inputs will survive DO-160D level 3, wave-
forms 3, 4 and 5A without external components.
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
LOGIC INPUTS (
,
)
Input Voltage
Input voltage HI
V
2.0
V
Input voltage LO
V
0.8
V
Input current
Input sink
I
V
= V
1.0
Input source
I
V = 0 V
-1.0
OUTPUTS
Logic output voltage
High
V
I
= -5 mA
2.4
V
Low
V
I
= 5 mA
0.4
V
Logic output voltage (CMOS)
High
V
I
= -100 uA
V
- 0.2
V
Low
V
IOL = 100 uA
0.2
V
Tri-state output current
I
V
= 0 V or V
10
SUPPLY CURRENT
V
current
I
V
= 0 V (all inputs)
5
10
mA
SWITCHING CHARACTERISTICS
Propagation delay
IN to OUT
t
, t
500
ns
Output enable time
t , t
From
or
25
ns
Output disable time
t , t
From
or
25
ns
CE OE
CE
OE
CE
OE
IH
IL
IH
IH
DD
IL
IL
OH
OH
OL
OL
OH
OH
DD
OL
OZ
OUT
DD
DD
DD
IN
LH
HL
ZL
ZH
LZ
HZ
A
A
A
PACKAGE
DESCRIPTION
TEMPERATURE
RANGE
PROCESS
FLOW
BURN
IN
HI-8421, HI-8424
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