Standard Products
PCS5035 Quintet Precision Current Sources
Built-In Comparators
Radiation Tolerant
www.aeroflex.com/pcs
September 12, 2012
FEATURES
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Radiation Performance
- Total dose > 100 krad (Si), Dose rate = 50 - 300 rads(Si)/s
- ELDRS
> 15 krads (Si), Dose rate = .01 rads(Si)/s
Five high precision 80µA current source outputs/comparator inputs
Monolithic construction
Designed for thermistor temperature monitoring
Enable control
Long term stability
Low drift
Zener protected input
DC supply voltage +5V
Low supply current
High impedance sensor interface
Designed for aerospace and high reliability space applications
0.63"Sq x 0.125"Ht, 18 lead, hermetic flat package
Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G.
GENERAL DESCRIPTION
The Aeroflex Plainview PCS5035 contains "Five Monolithic" precision current sources designed for
thermistor current monitor and resistive sensor applications. The precision current source
(80µA ±2µA)/Comparator inputs are compared to a external reference of 0V
DC
to 3V
DC
. A precision internal
2.0V
DC
reference is provided if an external reference is not available. See Figure 1.
The comparator outputs of two (2) PCS5035 can be wired or’ed to provide 10 sensors inputs. Current source
output/comparator inputs of two or more units can be tied together to provide more sensor current. A logic
"high" of 3.4V
DC
maximum on the enable pin turns on the current source/comparators. Any unused current
source output/comparator inputs can be left open circuit without affecting other I/O’s.
SCD5035 Rev G
1,18
V
CC
I = 80µA
I
OUT
/V
IN
_
1
2
10K
17
12
+
V
OUT
_
1
Comp_Ref
-
I = 80µA
I
OUT
/V
IN
_
2
3
+
10K
16
V
OUT
_
2
-
I = 80µA
I
OUT
/V
IN
_
3
4
+
10K
15
V
OUT
_
3
-
I = 80µA
I
OUT
/V
IN
_
4
5
+
10K
14
V
OUT
_
4
-
I = 80µA
I
OUT
/V
IN
_
5
6
+
10K
13
V
OUT
_
5
-
8
Enable
BG
OUT
GND
CASE GND
Precision
2 Volt
Reference
11
9,10
7
FIGURE 1 – Schematic Diagram
SCD5035 Rev G 9/12/2012
Aeroflex Plainview
2
ABSOLUTE MAXIMUM RATINGS
Parameter
Operating Case Temperature
Storage Case Temperature
Power Supply Voltages (V
CC
)
Range
-55 to +125
-65 to +150
+7.0
Units
°C
°C
V
NOTICE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rating only;
functional operation beyond the "Operation Conditions" is not recommended and extended exposure beyond the "Operation Conditions" may affect
device reliability.
ELECTRICAL PERFORMANCE CHARACTERISTICS
(T
C
= -55°C
TO
+125°C, +V
CC
= +5.0V
DC
±5% -- U
NLESS OTHERWISE SPECIFIED
)
Parameter
Source Current 1-5
Symbol
I
O
I
OFF
Condition
0
V
IN
3.1V, V
EN
= V
ENH
0
V
IN
3.1V, V
EN
= V
ENL
I
OUT
= 80µA
Min
78
-
0
-
-
-
2.4
-
Max
82
150
3.1
3.1
1200
0.8
-
30
0.4
-
4.6
2.010
2.020
5
12
10
150
1500
3000
250
250
4.0
7.0
Unit
µA
nA
V
V
nA
V
V
mV
V
V
V
V
V
mV
K
µS
nS
nS
nS
nS
nS
mA
mA
Comparator In Voltage 1/
Comparator Ref In Voltage 1/
Comparator Ref In Current
Enable Input Voltage Low
Enable Input Voltage High
Comparator Hysteresis 1/
Output Voltage Low 1-5
Output Voltage High 1-5
Input Open Circuit Voltage
Band Gap Regulator Output Voltage
V
IN
V
REF
I
REF
V
ENL
V
ENH
-
V
OL
V
OH
V
INOC
V
BG
I
SINK
2.0mA
-
4.4
4.0
T
A
= 25°C
T
C
= -55°C, +125°C
1.990
1.980
-5
8
Band Gap Load Regulation
V
BG
I
BG
R
INT
t
DLH
t
DHL
t
EDVLH
t
EDVHL
I
BG
= 0 to 2mA
Internal Output Pull-Up Resistor
Comparator Pulse Delay Low to High
Comparator Pulse Delay High to Low
Enable Delay to Vout
C
L
= 37pF , V
EN
= V
ENH
, V
REF
= 1V, V
IN
= 2V, I
SINK
= 0, See Figure 2 2/
C
L
= 37pF, V
IN
= 0V, V
REF
= 1V,
I
SINK
= 0, See Figure 2 2/
C
L
= 68pF, I
SINK
= 0, See Figure 2
2/
0.2
80
100
500
100
100
-
-
Enable Delay to Iout
t
EDILH
t
EDIHL
Supply current
Disabled
Enabled
I
CCD
I
CCE
Notes:
1/ Guaranteed by design, but not tested.
2/ Test fixture node capacitance plus 10pF scope capacitance.
SCD5035 Rev G 9/12/2012
Aeroflex Plainview
3
V
OUT
_
1-5
V
IN
_
1-5
t
DLH
t
DHL
Comparator Pulse Delay
V
OUT
_
1-5
ENABLE
t
EDVLH
t
EDVHL
ENABLE Delay to V
OUT
_
1-5
ENABLE
I
OUT
_
1-5
t
EDILH
t
EDIHL
ENABLE Delay to I
OUT
_
1-5
FIGURE 2 – TIMING DIAGRAMS
SCD5035 Rev G 9/12/2012
Aeroflex Plainview
4
One primary application for the Aeroflex PCS5035, as shown in Figure 3 below, would be to monitor the
temperature of different electronic bay areas in a Satellite, and report when any bay area has exceeded a
maximum temperature limit.
Thermistors with defined temperature characteristics are used as the sensors, and by providing a constant
stable current to the external Thermistor (Temp T1 to Temp T5), an accurate analog voltage of a specified
temperature trip point can be established. The comparator voltage reference input can be tailored to set the
trip point for the characteristic of the particular thermistor sensor used. The on-board precision 2V reference
can be used directly for voltages of 2 volts or less, or can be scaled with an external operational amplifier to
provide a voltage between 2 volts and the maximum input of 3.1V. Various temperature trip points could be
accomplished by using thermistors with different temperature characteristics.
+5V
I = 80µA
10K
V_
OUT
1
V
IN
_
1
I
OUT
_1
Temp
T1
+
-
1
V
OUT
_
1
C
L
T1
t
V
IN
_
2
V
IN
_
3
V
IN
_
4
V
IN
_
5
I
OUT
_5
Temp
T5
+2V
+
10K
V
OUT
_
2
V
OUT
_
3
V
OUT
_
4
V
OUT
_
5
C
L
T5
V_
OUT
5
5
-
t
FIGURE 3 – Typical Temperature Sensing Application
SCD5035 Rev G 9/12/2012
Aeroflex Plainview
5
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