Rev 2
July 2005
1/12
12
LM2901
Low Power Quad Voltage Comparator
Wide single supply voltage range or dual
supplies for all devices: +2V to +36V or 1V to
18V
Very low supply current (1.1mA) independent
of supply voltage (1.4mW/comparator at +5V)
Low input bias current: 25nA typ.
Low input offset current: 5nA 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, MOS, CMOS compatible
outputs
Description
This device consists of four independent precision
voltage comparators. All these comparators were
designed specifically to operate from a single
supply over a wide range of voltages. Operation
from split power supplies is also possible.
These comparators also have a unique
characteristic in that the input common-mode
voltage range includes ground even though
operated from a single power supply voltage
.
Order Codes
N
DIP14
(Plastic Package)
D
SO-14
(Plastic Micropackage)
P
TSSOP14
(Thin Shrink Small Outline Package)
Part Number
Temperature
Range
Package
Packaging
Marking
LM2901N
-40C, +125C
DIP14
Tube
LM2901N
LM2901D/LM2901DT
SO-14
Tube or Tape & Reel
2901
LM2901PT
TSSOP14
(Thin Shrink Outline Package)
Tape & Reel
2901
LM2901YD/YDT
SO-14 (automotive grade level)
Tube or Tape & Reel
2901Y
www.st.com
Absolute Maximum Ratings
LM2901
2/12
1
Absolute Maximum Ratings
Table 1.
Key parameters and their absolute maximum ratings
Table 2.
Operating conditions
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
18 to 36
V
V
ID
Differential Input Voltage
36
V
V
I
Input Voltage
-0.3 to +36
V
Output Short-circuit to Ground
(1)
1.
Short-circuit from the output to V
cc
+
can cause excessive heating and eventual destruction. The maximum
output current is approximately 20mA, independent of the magnitude of V
cc
+
P
d
Power Dissipation
(2)
DIP14
SO-14
TSSOP14
2.
Pd is calculated with T
amb
= +25C, T
j
= +150C and
R
thja
= 80C/W for DIP14 package
R
thja
= 150C/W for SO-14 package
R
thja
= 175C/W for TSSOP14 package
1500
830
710
mW
T
J
Junction Temperature
+150
C
T
stg
Storage Temperature Range
-65 to +150
C
ESD
HBM: Human Body Model
(3)
3.
Human body model, 100pF discharged through a 1.5k
resistor into pin of device.
1.5
Kv
MM: Machine Model
(4)
4.
Machine model ESD, a 200pF cap is charged to the specified voltage, then discharged directly into the IC with
no external series resistor (internal resistor < 5
), into pin to pin of device.
100
V
CDM: Charged Device Model
1500
V
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2 to 32
1 to 16
V
V
icm
Common Mode Input Voltage Range
0 to (V
CC
+
-1.5)
V
T
oper
Operating Free-Air Temperature range
-40 to +125
C
LM2901
Typical Application Schematics
3/12
2
Typical Application Schematics
Figure 1.
Schematic diagram (1/4 LM2901)
Figure 2.
Pin connection (top view)
4
5
6
7
8
9
10
11
13
1
2
3
14
12
Output 2
Output 4
Output 3
Non-inverting input 4
VCC
Non-inverting input 3
Inverting input 4
VCC+
Output 1
Inverting input 1
Non-inverting input 2
-
Inverting input 3
Non-inverting input 1
Inverting input 2
Electrical Characteristics
LM2901
4/12
3 Electrical
Characteristics
Table 3.
V
CC
+
= 5V, V
cc
-
= GND, T
amb
= 25C (unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
io
Input Offset Voltage
(1)
T
amb
= +25C
T
min
T
amb
T
max.
1.
At output switch point, VO
1.4V, RS = 0 with VCC
+
from 5V to 30V, and over the full input common-mode
range (0V to VCC
+
1.5V).
1
7
15
mV
I
io
Input Offset Current
T
amb
= +25C
T
min
T
amb
T
max.
5
50
150
nA
I
ib
Input Bias Current (I
I
+
or I
I
-
)
(2)
T
amb
= 2.5V
T
min
T
amb
T
max.
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 no loading charge exists on the reference of input lines
25
250
400
nA
A
vd
Large Signal Voltage Gain
(V
cc
= 15V,R
L
=15k
, V
o
=1 to 11V)
25
200
V/mV
I
cc
Supply Current (all comparators))
V
CC
= +5V, no load
V
CC
= +30V, no load
1.1
1.3
2
2.5
mA
V
icm
Input Common Mode Voltage Range (V
cc
= 30V)
(3)
T
amb
= +25C
T
min
T
amb
T
max.
3.
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 VCC
+
1.5V, but either or both inputs can go
to +30V without damage.
0
0
V
CC
+
-1.5
V
CC
+
-2
V
V
id
Differential Input Voltage
(4)
4.
The response time specified is for a 100mV input step with 5mV overdrive.
V
CC
+
V
V
OL
Low Level Output Voltage
V
id
= -1V, I
sink
= 4mA
T
amb
= +25C
T
min
T
amb
T
max
250
400
700
mV
I
oh
High Level Output Current
(V
CC
=V
o
=30V, V
id
= 1V)
T
amb
= +25C
T
min
T
amb
T
max
0.1
1
nA
A
I
sink
Output Sink Current (V
id
= -1V,V
o
= 1.5V)
6
16
mA
t
re
Small Signal Response Time
(5)
(R
L
= 5.1k
connected to V
CC
+
5.
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 bellow the negative power supply, if used)
1.3
s
t
rel
Large Signal Response Time
(6)
TTL Input (V
ref
= +1.4 V, R
L
=5.1k
to V
CC
+
)
Output Signal at 50% of final value
Output Signal at 95% of final value
6.
Maximum values are guaranteed by design.
500
1
ns
s
LM2901
Electrical Characteristics
5/12
Figure 3.
Supply current versus supply
voltage
Figure 4.
Input current versus supply voltage
Figure 5.
Output saturation voltage versus
output current
Figure 6.
Response time for various input
overdrives - negative transition
Figure 7.
Response time for various input
overdrives - positive transition
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