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
HI-8422
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
SYMBOL
28VIN3
0VIN3
28VIN4
0VIN4
28VIN5
0VIN5
28VIN6
0VIN6
28VIN7
0VIN7
OE
CE
A0
VDD
D8
D7
D6
D5
D4
28VIN8
0VIN8
N/C
D3
N/C
D2
D1
GND
N/C
28VIN1
0VIN1
28VIN2
0VIN2
FUNCTION
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete Input
Discrete input
Discrete Input
Discrete Input
Discrete Input
Digital input
Digital input
Digital input
Power
Tri-state output
Tri-state output
Tri-state output
Tri-state output
Tri-state output
Discrete Input
Discrete Input
Tri-state output
Tri-state output
Tri-state output
Power
Discrete Input
Discrete Input
Discrete Input
Discrete Input
DESCRIPTION
28 Volt / Open sensing input, channel 3
Open / Ground sensing input, channel 3
28 Volt / Open sensing input, channel 4
Open / Ground sensing input, channel 4
28 Volt / Open sensing input, channel 5
Open / Ground sensing input, channel 5
28 Volt / Open sensing input, channel 6
Open / Ground sensing input, channel 6
28 Volt / Open sensing input, channel 7
Open / Ground sensing input, channel 7
Output Enable. D1-D8 are high-impedance if OE is high
Chip Enable. D1-D8 are high-impedance if CE is high
When A0 is high D1 - D8 outputs data from 28V comparators
When A0 is low D1 - D8 show results from 0V comparators
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
Open / Ground sensing input, channel 8
Not connected
Logic output, channel 3
Not connected
Logic output, channel 2
Logic output, channel 1
Ground
Not connected
28 Volt / Open sensing input, channel 1
Open / Ground sensing input, channel 1
28 Volt / Open sensing input, channel 2
Open / Ground sensing input, channel 2
HOLT INTEGRATED CIRCUITS
2
HI-8422
BLOCK DIAGRAM
V
DD
OE
CE
3.6V Reference
66 K
+
-
29 K
28VIN1
66 K
+
-
29 K
28VIN2
+
66 K
28VIN3
29 K
66 K
-
+
-
29 K
66 K
28VIN4
+
-
29 K
D1
28VIN5
66 K
+
-
29 K
D2
28VIN6
66 K
+
-
29 K
D3
28VIN7
66 K
+
-
29 K
D4
28VIN8
8 x 2:1
MUX
V
DD
D5
5K
9K
D6
+
-
0VIN1
5K
9K
0VIN2
+
-
5K
9K
D7
D8
+
-
0VIN3
5K
9K
0VIN4
+
-
5K
9K
0VIN5
+
-
5K
9K
0VIN6
+
-
5K
9K
0VIN7
+
-
5K
9K
0VIN8
GND
+
-
9K
5K
3.25V Reference
A0
HOLT INTEGRATED CIRCUITS
3
HI-8422
ABSOLUTE MAXIMUM RATINGS
Supply voltage (VDD)
Logic input voltage range
Discrete input voltage range:
28V / Open Sensing
Open / Ground Sensing
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
-5 V to + 35 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.
DC ELECTRICAL CHARACTERISTICS
VDD = 5.0V ± 10%, GND = 0V, T
A
= Operating Temperature Range (unless otherwise specified).
PARAMETER
28 V / OPEN 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
OPEN / GROUND 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
High
Low
High
Low
Input voltage HI
Input voltage LO
Input sink
Input source
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
V
SG
V
SO
R
IG
R
IO
I
IO
I
IR
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
3.5
0
100
-100
-330
3.0
100
V
V
W
K
W
µA
5.0
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
V
IN
= 0 V (28V inputs)
V
IN
= V
DD
(other inputs)
10
20
mA
HOLT INTEGRATED CIRCUITS
4
HI-8422
AC ELECTRICAL CHARACTERISTICS
VDD = 5.0V ± 10%, GND = 0V, T
A
= Operating Temperature Range (unless otherwise specified).
PARAMETER
SWITCHING CHARACTERISTICS
Propagation delay
Output enable time
Output disable time
A0 Set-up time
A0 Hold time
IN to OUT
SYMBOL
t
LH
, t
HL
t
ZL
, t
ZH
t
LZ
, t
HZ
t
SU
t
HOLD
CONDITION
MIN
TYP
MAX
500
UNITS
ns
ns
ns
ns
ns
From CE or OE
From CE or OE
0
0
25
25
TIMING DIAGRAMS
A0
t
SU
t
HOLD
t
HL
t
LH
INx
CE or OE
t
ZL
, t
ZH
t
ZL
, t
ZH
Dx
Dx
Output Enable Timing
Input to Output Propagation Delay
LIGHTNING PROTECTION
The HI-8422’s 28V / Open Sensing inputs will survive light-
ning testing to DO-160D, Level 3 waveforms 3, 4 and 5A
without external components. The Open / Ground inputs will
survive waveforms 3 and 4 without external components. In
order to guarantee survival to waveform 5A an external se-
ries resistor of at least 3.3K
W
is recommended.
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 - 8422PQ 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
8422PQ
32 PIN PLASTIC QUAD FLATPACK (PQFP)
HOLT INTEGRATED CIRCUITS
5
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