HI-8421, HI-8424
August 2010
6-Channel / 8-Channel Discrete-to-Digital Interface
Sensing 28V / Open Signals
FEATURES
!
6 or 8 independent 28V / Open sensing channels
!
5.0V single supply operation
!
Low power CMOS technology
!
Industrial and Extended Temperatures
!
HI-8421 is a drop in replacement for DEI1054
DESCRIPTION
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
CE and OE 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.
PIN CONFIGURATIONS
IN1 1
16 GND
15 OUT1
14 OUT2
IN2 2
IN3 3
IN4 4
BLOCK DIAGRAM
V
DD
OE
CE
3.6V Reference
66 K
IN5 5
IN6 6
OE 7
CE 8
+
-
29 K
66 K
HI-8421PSI
HI-8421PST
13 OUT3
12 OUT4
11 OUT5
10 OUT6
9 VDD
IN1
OUT1
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
+
-
29 K
IN2
OUT2
+
66 K
IN3
29 K
66 K
-
+
-
29 K
OUT3
HI-8424PTI
HI-8424PTT
IN4
OUT4
+
66 K
IN5
29 K
66 K
-
+
-
29 K
66 K
OUT5
20 Pin TSSOP package
OUT6
IN6
+
-
29 K
FUNCTION TABLE
OUT7
OUT8
IN7
66 K
+
-
29 K
IN8
Discrete
Input
Open
28 Volts
X
X
CE
0
0
1
X
OE
0
0
X
1
Output
1
0
High Z
High Z
GND
(DS8421 Rev. F)
HOLT INTEGRATED CIRCUITS
www.holtic.com
08/10
HI-8421, HI-8424
PIN DESCRIPTIONS
PIN
(HI-8421) (HI-8424)
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
28 Volt / Open sensing input, channel 1
28 Volt / Open sensing input, channel 2
28 Volt / Open sensing input, channel 3
28 Volt / Open sensing input, channel 4
28 Volt / Open sensing input, channel 5
28 Volt / Open sensing input, channel 6
28 Volt / Open 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
28 Volt / Open sensing input, channel 8
Logic output, channel 3
Logic output, channel 2
Logic output, channel 1
Ground
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
Open state input voltage
28 V state input voltage
Open state input current
28 V state input current
Input resistance
Input current at 28 V
SYMBOL
V
SO
V
S28
I
SO
I
S28
R
IN
I
IN28
CONDITION
Input voltage to give high output
Input voltage to give low output
Maximum input current
to give high output
Minimum input current
to give low output
0 V < V
IN
< 16 V
V
IN
= 28 V
MIN
-5
14
TYP
MAX
10
UNITS
V
V
84
197
71
119
394
µA
µA
K
W
µA
HOLT INTEGRATED CIRCUITS
2
HI-8421, HI-8424
ELECTRICAL CHARACTERISTICS (Cont.)
VDD = 5.0V ± 10%, GND = 0V, T
A
= Operating Temperature Range (unless otherwise specified).
PARAMETER
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
IH
V
IL
I
IH
I
IL
V
OH
V
OL
V
OH
V
OL
I
OZ
CONDITION
MIN
2.0
TYP
MAX
UNITS
V
0.8
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
V
DD
- 0.2
0.2
±10
-1.0
2.4
0.4
1.0
V
µA
µA
V
V
V
V
µA
I
DD
t
LH
, t
HL
t
ZL
, t
ZH
t
LZ
, t
HZ
V
IN
= 0 V (all inputs)
5
10
500
mA
ns
ns
ns
From CE or OE
From CE or OE
25
25
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
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
8421PS
8424PT
16 PIN PLASTIC NARROW BODY SOIC (16HN)
20 PIN PLASTIC TSSOP (20HT)
HOLT INTEGRATED CIRCUITS
3
HI-8421, HI-8424
REVISION HISTORY
P/N
DS8421
Rev
F
Date
08/04/10
Description of Change
Removed reference to lightning protection throughout datasheet and added reference to
available temperature ranges.
HOLT INTEGRATED CIRCUITS
4
PACKAGE DIMENSIONS
16-PIN PLASTIC SMALL OUTLINE (SOIC) - NB
(Narrow Body)
.390 ± .004
(9.90 ± .10)
.0087 ± .0015
(.220 ± .029)
inches (millimeters)
Package Type: 16HN
.236
±.008
(5.99
±.20)
Top View
.1525 ± .0025
(3.87 ± .06)
.0165 ± .003
(.419 ± .089)
See Detail A
.061 ± .007
(1.549 ± .178)
.050
BSC
(1.27)
0° to 8°
.033 ± .017
(.838 ± .432)
.0025 ± .002
(.064 ± .038)
BSC = “Basic Spacing between Centers”
is theoretical true position dimension and
has no tolerance. (JEDEC Standard 95)
Detail A
20-PIN PLASTIC TSSOP
0.252 (6.400)
0.259 (6.600)
inches (millimeters)
Package Type: 20HT
0° to 8°
Pin 1
0.169 (4.300)
0.177 (4.500)
0.246 (6.250)
0.258 (6.550)
0.018 (0.450)
0.029 (0.750)
Gate Plane
0.010 (0.254)
Detail A
0.035 (0.889)
0.047 (1.200)
.031 (0.800)
.041(1.050)
See Detail A
.025
BSC
(.65)
0.007 (0.190)
0.012 (0.300)
0.002 (0.050)
0.006 (0.150)
0.004 (0.090)
0.008 (0.200)
BSC = “Basic Spacing between Centers”
is theoretical true position dimension and
has no tolerance. (JEDEC Standard 95)
HOLT INTEGRATED CIRCUITS
5
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