ST TS7221 User Manual
Single BiCMOS rail-to-rail micropower comparator
Features
■ Rail-to-rail inputs
■ Open drain output
■ Supply operation from 2.7 to 10 V
■ Typical supply current: 6 µA at 5 V
■ Response time of 0.5 µs at 5 V
■ Low input current
■ ESD protection: 2 kV (HBM), 200 V (MM)
■ Available in tiny SOT23-5 package
TS7221
L
SOT23-5L
Applications
■ Battery-powered systems
■ Notebooks and PDAs
■ PCMCIA cards
■ Cellular and mobile communications
■ Alarms and security systems
■ Replacement of amplifiers used in comparator
configurations for improved performance.
Description
The TS7221 is a micropower comparator
featuring a rail-to-rail input performance in a tiny
SOT23-5 package. This comparator is ideally
suited to space and weight-critical applications. It
is fully specified at 2.7-, 5- and 10-V operation
over industrial temperature ranges
(-40°C to +85°C).
The TS7221 features an open-drain output stage.
The speed-to-power ratio makes this device ultraversatile for a wide range of applications.
TS7221 open drain output
OUT
Vcc+
IN+
1
2
+
3
5
-
4
Vcc-
IN-
March 2009 Rev 5 1/13
www.st.com
13
Absolute maximum ratings TS7221
1 Absolute maximum ratings
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
V
ID
V
IN
V
OUT
I
IN
I
OUT
R
thja
R
thjc
T
Lead
T
stg
T
J
ESD
1. The magnitude of input voltages must never exceed 0.3 V beyond the supply voltage.
2. Short-circuits can cause excessive heating. These 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.
Table 2. Operating conditions
Supply voltage 12 V
Differential input voltage (V
Input voltage
(1)
(V
-
) -0.3 to (V
CC
-
) -0.3 to (V
CC
+
) +0.3 V
CC
+
) +0.3 V
CC
Output voltage 12 V
Current at input pins
(1)
± 5 mA
Current at output pin ± 30 mA
(2)
(2)
250
°C/W
°C/W
Thermal resistance junction to ambient
SOT23-5
Thermal resistance junction to case
SOT23-5 81
Lead temperature (soldering 10 seconds) 260 °C
Storage temperature -65 to +150 °C
Junction temperature 150 °C
(4)
(3)
2000
200
Human body model (HBM)
Machine model (MM)
V
Symbol Parameter Value Unit
V
T
V
CC
amb
icm
Supply voltage 2.7 to 10 V
Ambient temperature -40 to +85 °C
Common mode input voltage range (V
2/13
-
) -0.3 to (V
CC
+
) +0.3 V
CC
TS7221 Electrical characteristics
2 Electrical characteristics
Table 3. Electrical characteristics at V
+
=2.7V, T
CC
= 25° C (unless otherwise specified)
amb
Symbol Parameter Min. Typ. Max. Unit
Input offset voltage (full common mode range)
– TS7221A
V
IO
at T
min
≤ T
amb
≤ T
max
– TS7221B
at T
≤ T
amb
amb
amb
≤ T
≤ T
≤ T
(2)
max
max
(2)
max
ΔV
min
Input offset voltage drift with temperature 6 µV/oC
IO
I
IB
I
IO
Input bias current
at T
≤ T
min
Input offset current
≤ T
at T
min
CMRR Common-mode rejection ratio (0 < V
PSRR Power supply rejection ratio (2.7 < V
≤ T
≤ T
amb
amb
(3)
≤ T
≤ T
max
max
sink
= 5 mA
A
VD
V
icm
I
OH
V
OL
Voltage gain
Input common mode voltage range
at T
min
High level output voltage (IN+= 0.5 V, IN-= 0 V and
OUT = 10 V)
Low level output voltage, I
at T
min
1 300
1 150
< 2.7 V) 65 dB
icm
< 10 V) 80 dB
CC
240 dB
-0.3
0.0
0.1 500 nA
0.2 0.35
7
10
15
18
600
300
3
2.7
0.45
Supply current
I
CC
Output low
Output high
6
8
12
14
(1)
mV
pA
pA
V
V
µA
Response time low to high
(V
= 1.35 V, CL=50pF, RL=10kΩ)
T
PLH
ic
Overdrive = 10 mV
Overdrive = 100 mV
1.5
0.6
Response time high to low
= 1.35 V, CL=50pF, RL=10kΩ)
(V
T
PHL
T
F
T
R
1. Limits are 100% production-tested at +25° C. Behavior at temperature range limits is guaranteed through correlation and
by design.
2. Maximum values include unavoidable inaccuracies of industrial testing.
3. Design evaluation.
ic
Overdrive = 10 mV
Overdrive = 100 mV
Fall time
= 50 pF, RL=5kΩ, overdrive = 10 mV
C
L
Rise time
CL = 50 pF, RL=5kΩ, overdrive = 10 mV
1.5
0.5
0.3 µs
0.3 µs
3/13
µs
µs
Electrical characteristics TS7221
Table 4. Electrical characteristics for V
CC
+
= 5 V, T
= 25° C (unless otherwise specified)
amb
Symbol Parameter Min. Typ. Max. Unit
Input offset voltage (full common mode range)
– TS7221A
V
IO
at T
min
≤ T
amb
≤ T
max
– TS7221B
≤ T
≤ T
≤ T
amb
amb
amb
≤ T
≤ T
≤ T
max
(2)
max
max
(2)
ΔV
T
min
Input offset voltage drift with temperature 6 µV/oC
IO
I
IB
I
IO
Input bias current
at T
min
Input offset current
at T
min
CMRR Common-mode rejection ratio (0 < V
PSRR Power supply rejection ratio (2.7 < V
≤ T
min
amb
≤ T
(3)
≤ T
amb
max
≤ T
max
sink
= 5 mA
A
VD
V
icm
I
OH
V
OL
Voltage gain
Input common mode voltage range
at T
min
High level output voltage
(IN+= 0.5 V, IN-= 0 V and OUT = 10 V) 0.1 500
Low level output voltage, I
at T
1 300
1 150
< 5 V) 70 dB
icm
< 10 V) 80 dB
CC
240 dB
-0.3
0.0
0.2 0.40
7
10
15
18
600
300
5.3
5.0
0.55
Supply current
I
CC
Output low
Output high
6
8
12
14
(1)
mV
pA
pA
V
nA
V
µA
Response time low to high
T
PLH
(Vic= 2.5 V, CL =50pF, RL=10kΩ)
Overdrive = 10 mV
Overdrive = 100 mV
2
0.5
Response time high to low
= 2.5 V, CL = 50 pF, RL=10kΩ)
(V
T
PHL
T
F
T
R
1. Limits are 100% production-tested at +25° C. Behavior at temperature range limits is guaranteed through correlation and
by design.
2. Maximum values include unavoidable inaccuracies of industrial testing.
3. Design evaluation.
ic
Overdrive = 10 mV
Overdrive = 100 mV
Fall time
= 50 pF, RL=5kΩ, overdrive = 10 mV
C
L
Rise time
CL = 50 pF, RL=5kΩ, overdrive = 10 mV
2
0.4
0.3 µs
0.3 µs
µs
µs
4/13
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