HI-8420, HI-8423
August 2010
6-Channel / 8-Channel Discrete-to-Digital Interface
Sensing Open / Ground Signals
FEATURES
!
6 or 8 independent Open / Ground sensing channels
!
5.0V single supply operation
!
Low power CMOS technology
!
Industrial and Extended temperature ranges
!
HI-8420 is a drop in replacement for DEI1026
DESCRIPTION
The HI-8420 is a six channel discrete-to-digital interface
device. The HI-8423 has eight channels. Mixed-signal
CMOS technology is used to provide superior low-power
performance. The device inputs are configured to sense
Ground / Open discrete signals. The device outputs are
CMOS / TTL compatible and may be disabled (tri-state)
using the CE and OE pins.
The HI-8420 is a drop-in replacement for the DEI1026.
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.
PIN CONFIGURATIONS
IN1 1
16 GND
15 OUT1
14 OUT2
IN2 2
IN3 3
IN4 4
BLOCK DIAGRAM
OE
CE
V
DD
IN1
5K
9K
IN5 5
IN6 6
OE 7
+
-
OUT1
HI-8420PSI
HI-8420PST
13 OUT3
12 OUT4
11 OUT5
10 OUT6
9 VDD
CE 8
IN2
5K
9K
+
-
OUT2
16-Pin Plastic SOIC package
(Narrow Body)
IN1 1
IN2 2
IN3 3
IN4 4
IN5 5
IN6 6
IN7 7
OE 8
CE 9
VDD 10
20
19
18
17
16
15
14
13
12
11
GND
OUT1
OUT2
OUT3
IN8
OUT4
OUT5
OUT6
OUT7
OUT8
IN3
5K
9K
+
-
OUT3
IN4
5K
9K
+
-
OUT4
HI-8423PTI
HI-8423PTT
IN5
5K
9K
+
-
OUT5
IN6
5K
9K
+
-
OUT6
20 Pin TSSOP package
5K
9K
IN7
+
-
OUT7
FUNCTION TABLE
Discrete
Input
Open
Ground
X
X
CE
0
0
1
X
OE
0
0
X
1
Output
0
1
High Z
High Z
5K
9K
IN8
+
-
9K
5K
3.25V Reference
OUT8
GND
(DS8420 Rev. E)
HOLT INTEGRATED CIRCUITS
www.holtic.com
08/10
HI-8420, HI-8423
PIN DESCRIPTIONS
PIN
(HI-8420) (HI-8423)
1
2
3
4
5
6
-
7
8
9
-
-
10
11
12
-
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SYMBOL
IN1
IN2
IN3
IN4
IN5
IN6
IN7
OE
CE
V
DD
OUT8
OUT7
OUT6
OUT5
OUT4
IN8
OUT3
OUT2
OUT1
GND
FUNCTION
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Digital input
Digital input
Power
Tri-state output
Tri-state output
Tri-state output
Tri-state output
Tri-state output
Discrete Input
Tri-state output
Tri-state output
Tri-state output
Power
DESCRIPTION
Open / Ground sensing input, channel 1
Open / Ground sensing input, channel 2
Open / Ground sensing input, channel 3
Open / Ground sensing input, channel 4
Open / Ground sensing input, channel 5
Open / Ground sensing input, channel 6
Open / Ground sensing input channel 7
Output Enable. OUT1-OUT8 are high-impedance if OE is high
Chip Enable. OUT1-OUT8 are high-impedance if CE is high
Positive supply voltage 5.0 V
Logic output, channel 8
Logic output, channel 7
Logic output, channel 6
Logic output, channel 5
Logic output, channel 4
Open / Ground sensing input, channel 8
Logic output, channel 3
Logic output, channel 2
Logic output, channel 1
Ground
HOLT INTEGRATED CIRCUITS
2
HI-8420, HI-8423
ABSOLUTE MAXIMUM RATINGS
Supply voltage (VDD)
Logic input voltage range
Discrete input voltage range
Power dissipation at 25°C
Solder temperature
Storage temperature
-0.3 V to +7 V
-0.3 V to +5.5 V
-80 V to + 80 V
350 mW
275°C for 10 sec
-65°C to +150°C
RECOMMENDED
OPERATING CONDITIONS
Supply Voltage
VDD .................................. 4.5 V to 5.5 V
Operating Temperature Range
Industrial Screening .........
Hi-Temp Screening ........
-40°C to +85°C
-55°C to +125°C
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.
ELECTRICAL CHARACTERISTICS
VDD = 5.0V ± 10%, GND = 0V, T
A
= Operating Temperature Range (unless otherwise specified).
PARAMETER
DISCRETE INPUTS
Ground state input voltage
Open state input voltage
Ground state input resistor
Open state input resistor
Input source current
Reverse leakage current
LOGIC INPUTS (CE, OE)
Input Voltage
Input current
OUTPUTS
Logic output voltage
Logic output voltage (CMOS)
Tri-state output current
SUPPLY CURRENT
V
DD
current
SWITCHING CHARACTERISTICS
Propagation delay
Output enable time
Output disable time
IN to OUT
High
Low
High
Low
Input voltage HI
Input voltage LO
Input sink
Input source
SYMBOL
V
SG
V
SO
R
IG
R
IO
I
IO
I
IR
CONDITION
Input voltage to give high output
Input voltage to give low output
Resistor from input to ground
to give high output
Resistor from input to ground
to give low output
Current sourced into 100
W
to ground
V
IN
= 35 V, V
DD
= 0 V
MIN
TYP
MAX
3.0
UNITS
V
V
3.5
0
100
-100
-330
5.0
100
W
K
W
µA
mA
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
V
OH
V
OL
I
OZ
V
IH
= V
DD
V
IL
= 0 V
I
OH
= -5 mA
I
OL
= 5 mA
I
OH
= -100 uA
IOL = 100 uA
V
OUT
= 0 V or V
DD
2.0
0.8
1.0
-1.0
2.4
0.4
V
DD
- 0.2
0.2
±10
V
V
µA
µA
V
V
V
V
µA
I
DD
t
LH
, t
HL
t
ZL
, t
ZH
t
LZ
, t
HZ
V
IN
= V
DD
(all inputs)
5
10
150
mA
ns
ns
ns
From CE or OE
From CE or OE
25
25
HOLT INTEGRATED CIRCUITS
3
HI-8420, HI-8423
TIMING DIAGRAMS
CE or OE
t
ZL
, t
ZH
t
ZL
, t
ZH
INx
t
HL
t
LH
OUTx
Output Enable Timing
OUTx
Input to Output Propagation Delay
INPUT SWITCHING THRESHOLD
The input switching threshold of the Open / Ground
inputs will decrease with increasing series resistance
according to the function
V
T
= 3.25 - 0.1R
where V
T
is the nominal input switching threshold,
and R is the value of the external series resistor in
Kohms.
ORDERING INFORMATION
HI - 842xxx x x
PART
NUMBER
LEAD
FINISH
Blank
F
PART
NUMBER
Tin / Lead (Sn / Pb) Solder
100% Matte Tin (Pb-free, RoHS compliant)
TEMPERATURE
RANGE
FLOW
BURN
IN
I
T
PART
NUMBER
-40°C TO +85°C
-55°C TO +125°C
PACKAGE
DESCRIPTION
I
T
NO
NO
8420PS
8423PT
16 PIN PLASTIC NARROW BODY SOIC (16HN)
20 PIN PLASTIC TSSOP (20HT)
HOLT INTEGRATED CIRCUITS
4
HI-8420, HI-8423
REVISION HISTORY
P/N
DS8420
Rev
E
Date
08/04/10
Description of Change
Removed reference to lightning protected inputs throughout datasheet, increased discrete
input voltage range and added reference to available temperature ranges.
HOLT INTEGRATED CIRCUITS
5
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