TS391
Low power single voltage comparator
Features
■
■
■
■
■
■
■
■
■
Wide single supply voltage range or dual
supplies +2V to +34V or
±
1V to
±
17V
Very low supply current (0.2mA) independent
of supply voltage (1mW/comparator at +5V)
Low input bias current: 25nA typ.
Low input offset current:
±
5nA typ.
Low input offset voltage:
±
1mV typ.
Input common-mode voltage range includes
ground
Low output saturation voltage: 250mV typ.
(I
o
= 4mA)
Differential input voltage range equal to the
supply voltage
TTL, DTL, ECL, CMOS compatible outputs
Inverting input
3
4 Non-inverting input
L
SOT23-5
(Plastic package)
Pin connections
(top view)
Output
V
-
CC
1
5
+
VCC
2
Description
These devices consist of a low power voltage
comparator designed specifically to operate from
a single supply over a wide range of voltages.
Operation from split power supplies is also
possible.
This comparator also has a unique characteristic
in that the input common-mode voltage range
includes ground even though operated from a
single power supply voltage.
November 2007
Rev 3
1/8
www.st.com
8
Schematic diagram
TS391
1
Schematic diagram
Figure 1.
Schematic diagram
V
CC
3.5μA
100μA
3.5μA
100μA
Non-inverting
Input
V
CC
Inverting
Input
V
CC
V
O
V
CC
2/8
TS391
Absolute maximum ratings and operating conditions
2
Table 1.
Symbol
V
CC
V
id
V
i
Absolute maximum ratings and operating conditions
Absolute maximum ratings (AMR)
Parameter
Supply voltage
Differential input voltage
Input voltage
Output short-circuit to ground
(1)
T
j
R
thja
R
thjc
T
stg
ESD
Maximum junction temperature
Thermal resistance junction to ambient
(2)
Thermal resistance junction to case
(2)
Storage temperature range
HBM: human body model
(3)
MM: machine model
(4)
Value
±18 or 34
-±34
-0.3 to +34
Infinite
150
250
81
-65 to +150
300
V
200
°C
°C/W
°C/W
°C
Unit
V
V
V
1. Short-circuits from the output to V
CC+
can cause excessive heating and potential destruction. The maximum output current
is approximately 20mA independent of the magnitude of V
CC+
.
2. Short-circuits can cause excessive heating. These values are typical.
3. Human body model: A 100pF capacitor is charged to the specified voltage, then discharged through a 1.5kΩ resistor
between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
4. Machine model: A 200pF capacitor is charged to the specified voltage, then discharged directly between two pins of the
device with no external series resistor (internal resistor < 5Ω). This is done for all couples of connected pin combinations
while the other pins are floating.
Table 2.
Symbol
V
CC
Operation conditions
Parameter
Supply voltage
Input common mode voltage range
(1)
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Operating free air temperature range
Value
2 to 34
±1 to ±17
0 to V
CC+
-1.5
0 to V
CC+
-2
-40 to +125
Unit
V
V
icm
T
oper
V
°C
1. The input common-mode voltage of either input signal voltage should not be allowed to go negative by more than 0.3V. The
upper end of the common-mode voltage range is V
CC+
–1.5V, but either or both inputs can go to +30V without damage.
3/8
Electrical characteristics
TS391
3
Table 3.
Symbol
V
io
I
io
I
ib
A
vd
I
CC
V
id
I
sink
V
OL
I
OH
tre
t
rel
Electrical characteristics
V
CC+
= +5V, V
CC-
= 0V, T
amb
= 25°C (unless otherwise specified)
Parameter
Input offset voltage
(1)
Input offset current
Input bias current
(2)
Large signal voltage gain
Supply current
Differential input voltage
(3)
Output sink current
Low level output voltage
High level output current
Small signal response time
Large signal response time
V
id
= -1V, V
O
= 1.5V
V
id
= 1V, V
CC+
= V
O
= 30V
T
min
≤
T
amb
≤
T
max
V
id
= 1V, V
CC+
= V
O
= 30V
T
min
≤
T
amb
≤
T
max
R
L
= 5.1kΩ to V
CC+ (4)
V
i
= TTL, V
ref
= +1.4V,
R
L
= 5.1kΩ to V
CC+
6
16
250
0.1
1
1.3
300
400
700
Test conditions
T
min
≤
T
amb
≤
T
max
5
T
min
≤
T
amb
≤
T
max
25
T
min
≤
T
amb
≤
T
max
,
V
CC+
= 15V, R
L
= 15kΩ
V
o
= 1 to 11V
V
CC+
= 5V, no load
V
CC+
= 30V, no load
50
200
0.2
0.5
0.5
1.25
V
CC+
Min.
Typ.
1
Max.
5
9
50
150
250
400
Unit
mV
nA
nA
V/mV
mA
V
mA
mV
nA
µA
µs
ns
1. At output switch point, V
O
≈
1.4V, R
S
= 0Ω with V
CC+
from 5V to 30V and over the full input common-mode range (0V to
V
CC+
-1.5V).
2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant,
independent of the state of the output, so there is no loading charge on the reference or input lines.
3. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the
common-mode range, the comparator will provide a proper output state. The low input voltage state must not be less than
–0.3V (or 0.3V below the negative power supply, if used).
4. The response time specified is for a 100mV input step with 5mV overdrive. For larger overdrive signals, 300ns can be
obtained.
4/8
TS391
Electrical characteristics
Figure 2.
Supply current vs. supply voltage
Figure 3.
OUTPUT VOLTAGE (V)
Response time for various input
overdrives - negative transition
INPUT VOLTAGE (mV)
6
5
4
3
2
1
0
0
-50
-100
Input overdrive : 5mV
20mV
e
I
5V
5.1kΩ
e
o
100mV
T
amb
= +25˚C
0
0.5
1
1.5
TIME (μs)
2
Figure 4.
Input current vs. supply voltage
Figure 5.
OUTPUT VOLTAGE (V)
Response time for various input
overdrives - positive transition
80
V
i
= 0V
INPUT CURRENT (nA)
60
40
20
T
amb
= +125˚C
T
amb
= +70˚C
0
10
20
30
SUPPLY VOLTAGE (V)
40
R
i
= 10
Ω
T
amb
= 0˚C
T
amb
= +25˚C
9
T
amb
= -55˚C
INPUT VOLTAGE (mV)
6
Input overdrive : 100mV
5
4
5mV
3
2
20mV
1
0
100
T
amb
= +25˚C
50
0
0
0.5
1
1.5
TIME (μs)
5V
5.1k
Ω
e
I
e
o
2
Figure 6.
Output saturation voltage vs.
output current
10
SATURATION VOLTAGE (V)
10
10
10
10
1
Out of saturation
0
T
amb
= +125˚C
-1
T
amb
= -55˚C
-2
T
amb
= +25˚C
-3
-2
-1
0
1
2
10
10
10
10
10
OUTPUT SINK CURRENT (mA)
5/8
嵌入式系统
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