ST LM2903 User Manual
Features
■ Wide single supply voltage range or dual
supplies +2 V to +36 V or ±1 V to ±18 V
■ Very low supply current (0.4 mA) independent
of supply voltage (1 mW/comparator at +5 V)
■ Low input bias current: 25 nA typ.
■ Low input offset current: ±5 nA typ.
■ Input common-mode voltage range includes
negative rail
■ Low output saturation voltage:
250 mV typ. (I
■ Differential input voltage range equal to the
= 4 mA)
O
supply voltage
■ TTL, DTL, ECL, MOS, CMOS compatible
outputs
Description
This device consists of two independent lowpower voltage comparators designed specifically
to operate from a single supply over a wide range
of voltages. Operation from split power supplies is
also possible.
LM2903
Low-power dual voltage comparator
N
DIP8
(Plastic package)
D
SO-8
(Plastic micropackage)
P
TSSOP8
(Thin shrink small outline package)
Pin connections (top view)
The device also has a unique characteristic in that
the input common-mode voltage range includes
the negative rail even though operated from a
single power supply voltage.
1 - Output 1
2 - Inverting input 1
3 - Non-inverting input 1
4 - V
CC
-
5 - Non-inverting input 2
6 - Inverting input 2
7 - Output 2
8 - V
CC
February 2012 Doc ID 2470 Rev 9 1/15
+
www.st.com
15
Schematic diagram LM2903
1 Schematic diagram
Figure 1. Schematic diagram (1/2 LM2903)
Non-inverting
input
Inverting
input
3.5 μA
100 μA
3.5 μA 100 μA
2/15 Doc ID 2470 Rev 9
LM2903 Absolute maximum ratings and operating conditions
2 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
V
id
V
in
R
thja
R
thjc
T
j
T
stg
ESD
1. Short-circuits from the output to V
maximum output current is approximately 20 mA, independent of the magnitude of V
2. Short-circuits can cause excessive heating and destructive dissipation. Values are typical.
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ 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 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
5. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
Table 2. Operating conditions
Supply voltage ±18 to 36 V
Differential input voltage ±36 V
Input voltage -0.3 to +36 V
Output short-circuit to ground
(1)
Thermal resistance junction to ambient
DIP8
SO-8
TSSOP8
Thermal resistance junction to case
(2)
DIP8
SO-8
TSSOP8
(2)
Infinite
85
125
120
41
40
37
°C/W
°C/W
Maximum junction temperature +150 °C
Storage temperature range -65 to +150 °C
Human body model (HBM)
Machine model (MM)
CDM: charged device model
CC
(3)
(4)
(5)
+
can cause excessive heating and possible destruction. The
800 V
200 V
1.5 kV
+
.
CC
Symbol Parameter Value Unit
V
T
icm
oper
Common mode input voltage range
≤ T
T
min
amb
≤ T
max
0 to V
0 to V
Operating free-air temperature range -40 to +125 °C
CC
CC
+
-1.5
+
-2
V
Doc ID 2470 Rev 9 3/15
Electrical characteristics LM2903
3 Electrical characteristics
Table 3. V
CC
+
= 5 V, V
Symbol Parameter Min. Typ. Max. Unit
V
A
Input offset voltage
io
I
io
I
ib
≤ T
T
min
Input offset current
≤ T
T
min
Input bias current
T
≤ T
min
Large signal voltage gain
vd
= 15V, RL=15kΩ, Vo=1 to 11V
V
CC
amb
amb
amb
Supply current (all comparators)
I
V
V
I
I
sink
t
CC
id
OL
OH
res
= 5V, no load
V
CC
= 30V, no load
V
CC
Differential input voltage
Low level output voltage (Vid = -1V, I
≤ T
T
min
amb
High level output current (V
≤ T
T
min
amb
≤ T
Output sink current (Vid = -1V, Vo = 1.5V) 6 16 mA
Small signal response time
Large signal response time
rel
TTL input (V
Output signal at 50% of final value
t
ref
Output signal at 95% of final value
1. At output switch point, VO ≈ 1.4 V, RS = 0 Ω with V
2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant,
3. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the
4. The response time specified is for a 100 mV input step with 5 mV overdrive.
5. Maximum values are guaranteed by design and evaluation.
+
to V
–1.5 V).
CC
independent of the state of the output, so no loading charge exists on the reference of input lines.
common-mode range, the comparator will provide a proper output state. The low input voltage state must not be less than
–0.3 V (or 0.3 V below the negative power supply, if used).
-
= GND, T
≤ T
≤ T
≤ T
≤ T
max
CC
max
max
(2)
max
max
(1)
(3)
amb
=30V, Vid = 1V)
CC =Vo
(4)
(RL = 5.1kΩ to V
(5)
= +1.4 V, RL=5.1kΩ to V
= 25°C (unless otherwise specified)
17
15
550
150
25 250
400
25 200 V/mV
0.4
1
sink
= 4mA)
250 400
0.1
+
)1.3µs
CC
+
)
CC
+
from 5 V to 30 V, and over the full input common-mode range (0 V
CC
2.5
V
700
500
1
CC
1
1
mV
nA
nA
mA
+
V
mV
nA
µA
ns
µs
4/15 Doc ID 2470 Rev 9
LM2903 Electrical characteristics
Figure 2. Supply current vs. supply voltage Figure 3. Input current vs. supply voltage
Figure 4. Output saturation voltage vs.
output current
Figure 5. Response time for various input
overdrives - negative transition
Figure 6. Response time for various input
overdrives - positive transition
Doc ID 2470 Rev 9 5/15
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