HI-8422
September 2006
16-Channel Discrete-to-Digital Interface
Sensing 28 Volt / Open and Open / Ground Signals
FEATURES
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8 independent 28 Volt / Open sensing channels
8 independent Open / Ground sensing channels
5.0 V single supply operation
Low power CMOS technology
Sense inputs are internally lightning protected per
DO-160D level 3
Military processing options available
DESCRIPTION
The HI-8422 is a sixteen channel discrete-to-digital
interface device. The device has eight channels designed
to sense 28 V / Open signals and eight channels that sense
Open / Ground signals. Data is multiplexed from each bank
of sensors to an eight bit digital databus. Mixed-signal
CMOS technology is used to provide superior low-power
performance. The device outputs are CMOS / TTL
compatible and may be disabled (tri-state) using the CE
and OE pins.
The HI-8422 is offered in a small footprint 32-pin Plastic
Quad Flat Package (PQFP). Please contact the Holt sales
department for other packaging options.
PIN CONFIGURATION
31 - 28VIN2
27 - GND
28 - N/C
26 - D1
28V
Inputs
Open
28 Volts
X
X
X
X
0V
Inputs
X
X
Open
Ground
X
X
A0
1
1
0
0
X
X
CE
0
0
0
0
1
X
OE
0
0
0
0
X
1
Output
28VIN3 - 1
24 - N/C
23 - D3
1
0
0
1
High Z
High Z
0VIN3 - 2
28VIN4 - 3
0VIN4 - 4
28VIN5 - 5
0VIN5 - 6
28VIN6 - 7
0VIN6 - 8
25 - D2
FUNCTION TABLE
29 - 28VIN1
32 - 0VIN2
30 - 0VIN1
HI-8422PQI
&
HI-8422PQT
22 - N/C
21 - 0VIN8
20 - 28VIN8
19 - D4
18 - D5
17 - D6
0VIN7 - 10
CE - 12
VDD - 14
A0 - 13
D8 - 15
32 Pin PQFP package
(DS8422 Rev. E)
HOLT INTEGRATED CIRCUITS
www.holtic.com
28VIN7 - 9
OE - 11
D7 - 16
09/06
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
