February 2012 Doc ID 2468 Rev 7 1/17
17
LM2901
Low-power quad voltage comparator
Features
■Wide single supply voltage range or dual
supplies for all devices: +2 V to +36 V or ±1 V
to ±18 V
■Very low supply current (1.1 mA) independent
of supply voltage (1.4 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. (IO = 4 mA)
■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, which are 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 the negative rail even
though operated from a single power supply
voltage.
N
DIP14
(Plastic package)
D
SO-14
(Plastic micropackage)
P
TSSOP14
(Thin shrink small outline package)
Q4
QFN16 3x3
(Plastic micropackage)
www.st.com
Pin connection and schematic diagram LM2901
2/17 Doc ID 2468 Rev 7
1 Pin connection and schematic diagram
Figure 1. Pin connections (top view)
Figure 2. Schematic diagram
4
5
6
7
8
9
10
11
13
1
2
3
14
12
Output 2
Output 4
Output 3
Non-inverting input 4
V
CC
-
Non-inverting input 3
Inverting input 4
V
CC
+
Output 1
Inverting input 1
Non-inverting input 2 Inverting input 3
Non-inverting input 1
Inverting input 2
Non-inverting
input
Inverting
input
3.5 μA
V
CC
V
O
3.5 μA100 μA
100 μA
V
CC
LM2901 Absolute maximum ratings and operating conditions
Doc ID 2468 Rev 7 3/17
2 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
VCC Supply voltage ±18 to 36 V
Vid Differential input voltage ±36 V
Vin Input voltage -0.3 to +36 V
Output short-circuit to ground (1)
1. Short-circuits from the output to VCC+ can cause excessive heating and eventual destruction. The
maximum output current is approximately 20 mA, independent of the magnitude of VCC+.
Rthja
Thermal resistance junction to ambient(2)
DIP14
SO-14
TSSOP14
QFN16 3x3
2. Short-circuits can cause excessive heating. Destructive dissipation can result from simultaneous short-
circuits on all amplifiers. All values are typical.
80
105
100
45
°C/W
Rthjc
Thermal resistance junction to case(2)
DIP14
SO-14
TSSOP14
QFN16 3x3
33
31
32
14
TjMaximum junction temperature +150 °C
Tstg Storage temperature range -65 to +150 °C
ESD
HBM: human body model(3)
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.
500 V
MM: machine model(4)
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.
100 V
CDM: charged device model(5)
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.
1500 V
Table 2. Operating conditions
Symbol Parameter Value Unit
VCC Supply voltage 2 to 32
±1 to ±16 V
Vicm
Common mode input voltage range
Tmin ≤ T
amb ≤ T
max
0 to (VCC+ -1.5)
0 to (VCC+ -2) V
Toper Operating free-air temperature range -40 to +125 °C
Electrical characteristics LM2901
4/17 Doc ID 2468 Rev 7
3 Electrical characteristics
Table 3. Electrical characteristics at VCC+ = 5 V, VCC- = GND, Tamb = 25° C
(unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
Vio
Input offset voltage (1)
Tmin ≤ T
amb ≤ T
max
1. At output switch point, VO ≈ 1.4 V, RS = 0 with VCC+ from 5 V to 30 V, and over the full input common-
mode range (0 V to VCC+ –1.5 V).
17
15 mV
Iio
Input offset current
Tmin ≤ T
amb ≤ T
max
550
150 nA
Iib
Input bias current (II+ or II-) (2)
Tmin ≤ 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 there is no loading charge on the reference of input
lines.
25 250
400 nA
Avd
Large signal voltage gain
(VCC = 15 V, RL=15kΩ, Vo= 1 to 11 V) 25 200 V/mV
ICC
Supply current (all comparators)
VCC = +5 V, no load
VCC = +30 V, no load
1.1
1.3
2
2.5
mA
Vid Differential input voltage(3)
3. The response time specified is for a 100 mV input step with 5 mV overdrive.
VCC+V
VOL
Low level output voltage
Vid = -1V, Isink = 4 mA
Tmin ≤ T
amb ≤ T
max
250 400
700
mV
IOH
High level output current
(VCC =V
o = 30 V, Vid = 1 V)
Tmin ≤ T
amb ≤ T
max
0.1
1
nA
µA
Isink Output sink current (Vid = -1 V,Vo = 1.5 V) 6 16 mA
tres
Small signal response time(4)
(RL = 5.1 kΩ connected to VCC+)
4. 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 –0.3 V (or 0.3 V below the negative power supply, if used).
1.3 µs
trel
Large signal response time(5)
TTL input (Vref = +1.4 V, RL=5.1kΩ to
VCC+)
Output signal at 50% of final value
Output signal at 95% of final value
5. Maximum values are guaranteed by design.
500
1
ns
µs
LM2901 Electrical characteristics
Doc ID 2468 Rev 7 5/17
Figure 3. Supply current vs. supply voltage Figure 4. Input current vs. supply voltage
Figure 5. Output saturation voltage vs.
output current
Figure 6. Response time for various input
overdrives - negative transition
Figure 7. Response time for various input
overdrives - positive transition
Typical application schematics LM2901
6/17 Doc ID 2468 Rev 7
4 Typical application schematics
Figure 8. Basic comparator Figure 9. Driving CMOS
VCC = 5 V
15 kΩ
VO
+V(ref)
1/4
LM2901
-V(ref)
5 V
100 kΩ
&
1/ 4
LM2901
+V(ref)
-V(ref)
Figure 10. Driving TTL Figure 11. Low frequency op-amp
5 V
10 kΩ
+V(ref)
&
&
1/ 4
LM2901
-V(ref)
5 V
15 k
Ω
eo
0.5
μ
F
100 kΩ
el
1 kΩ
~
1/4
LM2901
A
V
= 100
Figure 12. Low frequency op-amp with boost Figure 13. Transducer amplifier
5 V
15 kΩ
0.5 μF
100 k
Ω
1 kΩ
~
2N 2222
(e
o
= 0 V for e
l
= 0 V)
1/ 4
LM2901
e
o
e
l
A
V
= 100
5 V
10 kΩ
eo
20 MΩ
3 kΩ
Magnetic pick-up
10 kΩ
1/ 4
LM2901
LM2901 Typical application schematics
Doc ID 2468 Rev 7 7/17
Figure 14. Low frequency op-amp with
offset adjust
Figure 15. Zero crossing detector (single
power supply)
e
l
~2N 2222
5 V
e
o
R1
100 kΩ
1 kΩ
5 V
1 MΩ
100 kΩ
1 MΩ
Offset adjust
R
S
R
1
15 kΩ
0.5 μF
R
2
1/ 4
LM2901
100 kΩ
10 kΩ
e
l
20 MΩ
5 V
1N4148
5.1 kΩ
5.1 kΩ
100 kΩ
1/ 4
LM2901
5.1 kΩ
Figure 16. Limit comparator Figure 17. Split-supply applications - zero
crossing detector
10 kΩ
eI~
RS
2RS
V(ref)
high
V(ref)
low
2N 2222
VCC
Lamp
1/ 4
LM2901
1/ 4
LM139
2RS
(12 V)
15 V
5.1 kΩ
e
o
e
I
~
15 V
1/4
LM2901
Figure 18. Crystal controlled oscillator Figure 19. Comparator with a negative
reference
2 kΩ
200 kΩ
e
o
V
CC
0
100 kΩ
200 kΩ
1/ 4
LM2901
0.1 μF
f = 100 kHz
V
CC
= 15 V
15 V
5.1 kΩ
eo
eI~
15 V
5 V
1/ 4
LM2901
Typical application schematics LM2901
8/17 Doc ID 2468 Rev 7
Figure 20. Time delay generator
Figure 21. Two-decade high-frequency VCO
VCC
0
V(ref.)
10 kΩ
1/4
15 kΩ
200 k
Ω
3 kΩ
3 k
Ω
3 k
Ω
10 MΩ
VO2
V03
O1
V
51 kΩ
V1
V2
0.001
μ
F
V
C1
V3
VCC
VC1
V1
V2
V
3
0
01
tt3
t4
t
2
t
t
VCC
t
0
t
1
VCC
VCC
VCC=+15V
1/4
LM2901
1/4
1/4
10 kΩ
10 kΩ
10 kΩ
10 kΩ
10 MΩ
10 MΩ
51 kΩ
51 kΩ
t2
to
t3
to
tA
to
Input gating signal
LM2901
LM2901
LM2901
VCC VCC
100 kΩ
3 kΩ
5.1 kΩ
/2
VCC /2
0.01 μF
500 pF
100 kΩ
0.1 μF
20 kΩ
50 kΩ
=+30V
+250 mV Vcontrol +50 V
700 Hz f 100 kHz
o
20 kΩ
3 kΩ
1/ 4
LM2901
1/ 4
LM2901
1/ 4
LM2901
Output 1
Output 2
VCC
VCC
Frequency control
voltage input
Vcontrol
10 kΩ
LM2901 Package information
Doc ID 2468 Rev 7 9/17
5 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Package information LM2901
10/17 Doc ID 2468 Rev 7
5.1 DIP14 package information
Figure 22. DIP14 package mechanical drawing
Table 4. DIP14 package mechanical data
Dimensions
Ref.
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A5.330.21
A1 0.38 0.015
A2 2.92 3.30 4.95 0.11 0.13 0.19
b 0.36 0.46 0.56 0.014 0.018 0.022
b2 1.14 1.52 1.78 0.04 0.06 0.07
c 0.20 0.25 0.36 0.007 0.009 0.01
D 18.67 19.05 19.69 0.73 0.75 0.77
E 7.62 7.87 8.26 0.30 0.31 0.32
E1 6.10 6.35 7.11 0.24 0.25 0.28
e2.54 0.10
e1 15.24 0.60
eA 7.62 0.30
eB 10.92 0.43
L 2.92 3.30 3.81 0.11 0.13 0.15
LM2901 Package information
Doc ID 2468 Rev 7 11/17
5.2 QFN16 3 x 3 package information
Figure 23. QFN16 3 x 3 mm package mechanical drawing
Package information LM2901
12/17 Doc ID 2468 Rev 7
Figure 24. QFN16 3 x 3 mm footprint recommendation
Table 5. QFN16 3 x 3 mm package mechanical data (pitch 0.5 mm)
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 0.80 0.90 1.00 0.031 0.035 0.039
A1 0 0.05 0 0.002
A3 0.20 0.008
b 0.18 0.30 0.007 0.012
D 2.90 3.00 3.10 0.114 0.118 0.122
D2 1.50 1.80 0.059 0.071
E 2.90 3.00 3.10 0.114 0.118 0.122
E2 1.50 1.80 0.059 0.071
e 0.50 0.020
L 0.30 0.50 0.012 0.020
LM2901 Package information
Doc ID 2468 Rev 7 13/17
5.3 SO-14 package information
Figure 25. SO-14 package mechanical drawing
Table 6. SO-14 package mechanical data
Dimensions
Ref.
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 1.35 1.75 0.05 0.068
A1 0.10 0.25 0.004 0.009
A2 1.10 1.65 0.04 0.06
B 0.33 0.51 0.01 0.02
C 0.19 0.25 0.007 0.009
D 8.55 8.75 0.33 0.34
E 3.80 4.0 0.15 0.15
e1.27 0.05
H 5.80 6.20 0.22 0.24
h 0.25 0.50 0.009 0.02
L 0.40 1.27 0.015 0.05
k 8° (max.)
ddd 0.10 0.004
Package information LM2901
14/17 Doc ID 2468 Rev 7
5.4 TSSOP14 package information
Figure 26. TSSOP14 package mechanical drawing
Table 7. TSSOP14 package mechanical data
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A1.200.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.80 1.00 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.0089
D 4.90 5.00 5.10 0.193 0.197 0.201
E 6.20 6.40 6.60 0.244 0.252 0.260
E1 4.30 4.40 4.50 0.169 0.173 0.176
e 0.65 0.0256
L 0.45 0.60 0.75 0.018 0.024 0.030
L1 1.00 0.039
k0° 8°0° 8°
aaa 0.10 0.004
LM2901 Ordering information
Doc ID 2468 Rev 7 15/17
6 Ordering information
Table 8. Order codes
Order code Temperature
range Package Packing Marking
LM2901N
-40°C to +125°C
DIP14 Tube LM2901N
LM2901D
LM2901DT SO-14 Tube or tape & reel 2901
LM2901PT TSSOP14 Tape & reel
LM2901Q4T QFN16 3x3 Tape & reel K5I
LM2901YDT(1)
1. Qualified and characterized according to AEC Q100 and Q003 or equivalent, advanced screening
according to AEC Q001 & Q 002 or equivalent.
SO-14
(Automotive grade) Tape & reel
2901Y
LM2901YPT(1) TSSOP14
(Automotive grade) Tape & reel
Revision history LM2901
16/17 Doc ID 2468 Rev 7
7 Revision history
Table 9. Document revision history
Date Revision Changes
01-Jan-2002 1 Initial release.
01-Jul-2005 2
1 - PPAP references inserted in the datasheet see Table : Order
codes on page 1.
2 - ESD protection inserted in Table 1 on page 3.
01-Oct-2005 3
The following changes were made in this revision:
– PPAP part number added in table Order codes on page 1.
– Formatting changes throughout.
18-Jul-2006 4 ESD HBM value corrected in Table 1 on page 3.
19-Dec-2007 5
Added Rthja and Rthjc parameters to Table 1: Absolute maximum
ratings. Added footnotes for ESD parameters.
Removed Vicm parameter from electrical characteristics in Ta b l e 3 .
Reformatted package information in Section 5.
Added footnotes for automotive grade parts in Table 8: Order codes.
30-Apr-2009 6
Document reformatted.
Updated package information in Chapter 5: Package information.
Removed note 2 under Table 8: Order codes.
06-Feb-2012 7 Added QFN16 3 x 3 package in Chapter 5.
Removed LM2901YD order code from Ta b l e 8 .
LM2901
Doc ID 2468 Rev 7 17/17
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