HI-8420
October 2001
DESCRIPTION
The HI-8420 is a six channel discrete-to-digital interface
device. Mixed-signal CMOS technology is used to provide
superior low-power performance. The HI-8420 has six
separate Open / Ground sensing inputs. The device
outputs are CMOS / TTL compatible and may be disabled
(tri-state) using the CE and OE pins.
The device 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.
The HI-8420 is offered in a small footprint 16-pin plastic
package. Please contact the Holt sales department for
other packaging options.
PIN CONFIGURATION
IN1
IN2
IN3
IN4
IN5
IN6
OE
CE
1
2
3
4
5
6
7
8
16
15
14
GND
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
V
DD
HI-8420PS
13
12
11
10
9
16-Pin Plastic SOIC package
(Narrow Body)
FEATURES
!
!
!
!
!
Six independent Open / Ground sensing channels
5.0V single supply operation
BLOCK DIAGRAM
OE
Low power CMOS technology
Military processing options available
Drop in replacement for DEI1026
CE
V
DD
IN1
5K
9K
+
-
OUT1
IN2
5K
9K
+
-
OUT2
IN3
5K
9K
+
-
OUT3
FUNCTION TABLE
Discrete
Input
Open
Ground
X
X
CE
0
0
1
X
OE
0
0
X
1
Output
IN4
5K
9K
+
-
OUT4
5K
9K
IN5
+
-
OUT5
0
1
High Z
High Z
5K
9K
IN6
+
-
9K
5K
3.25V Reference
OUT6
GND
(DS8420 Rev. New)
HOLT INTEGRATED CIRCUITS
www.holtic.com
10/01
HI-8420
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SYMBOL
IN1
IN2
IN3
IN4
IN5
IN6
OE
CE
V
DD
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
GND
FUNCTION
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
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
Output Enable. OUT1-OUT6 are high-impedance if OE is high
Chip Enable. OUT1-OUT6 are high-impedance if CE is high
Positive supply voltage 5.0 V
Logic output, channel 6
Logic output, channel 5
Logic output, channel 4
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
-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.
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
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
Ω
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
Ω
K
Ω
µA
mA
HOLT INTEGRATED CIRCUITS
2
HI-8420
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
= V
DD
(all inputs)
5
10
150
mA
ns
ns
ns
From CE or OE
From CE or OE
25
25
CE or OE
t
ZL
, t
ZH
t
ZL
, t
ZH
INx
t
HL
t
LH
OUTx
OUTx
Output Enable Timing
Input to Output Propagation Delay
ORDERING INFORMATION
HI-8420PSI
HI-8420PST
16 PIN PLASTIC SOIC (NARROW BODY)
16 PIN PLASTIC SOIC (NARROW BODY)
-40°C TO +85°C
-55°C TO +125°C
I
T
NO
NO
SOLDER
SOLDER
HOLT INTEGRATED CIRCUITS
3
微控制器 MCU
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