TS9001
1.6V Nanopower Comparator with Internal Reference
FEATURES
♦
Improved Electrical Performance
over MAX9117-MAX9118
♦
Guaranteed to Operate Down to +1.6V
♦
Ultra-Low Supply Current: 600nA
♦
Internal 1.252V ±1% Reference
♦
Input Voltage Range Extends 200mV Outside-
the-Rails
♦
No Phase Reversal for Overdriven Inputs
♦
Output Stage: Push-pull (TS9001-1)
Open-Drain (TS9001-2)
♦
Crowbar-Current-Free Switching
♦
Internal Hysteresis for Clean Switching
♦
5-pin SC70 Packaging
DESCRIPTION
The nanopower TS9001-1/2 analog comparators
guarantee +1.6V operation, draw very little supply
current, and have robust input stages that can
tolerate input voltages beyond the power supply. Both
products are Touchstone Semiconductor’s first
analog comparator products in its “NanoWatt Analog”
high-performance analog integrated circuits portfolio.
The TS9001-1/2 draw 600nA of supply current and
include an on-board +1.252V±1% reference. These
comparators are also electrically and form-factor
identical to the MAX9117 and the MAX9118 family of
analog comparators. Both comparators offer a 33%
improvement in voltage reference initial accuracy and
the TS9001-1 offers 73% higher output current drive.
The TS9001-1’s push-push output drivers were
designed to drive 5mA loads from one supply rail to
the other supply rail. The TS9001-2’s open-drain
output stage make it easy to incorporate this analog
comparator into systems that operate on different
supply voltages. Both devices are available in an
ultra-small 5-pin SC70 package.
APPLICATIONS
2-Cell Battery Monitoring/Management
Medical Instruments
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Ultra-Low-Power Systems
Mobile Communications
Telemetry and Remote Systems
TYPICAL APPLICATION CIRCUIT
PART
TS9001-1
TS9001-2
INTERNAL
REFERENCE
Yes
Yes
OUTPUT
STAGE
Push-Pull
Open-Drain
IN-
Connection
REF
REF
SUPPLY
CURRENT (nA)
600
600
NanoWatt Analog and the Touchstone Semiconductor logo are
registered trademarks of Touchstone Semiconductor, Incorporated.
Page 1
© 2011 Touchstone Semiconductor, Inc. All rights reserved.
TS9001
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
) ............................................ +6V
Voltage Inputs (IN+, IN-, REF) .... (V
EE
- 0.3V) to (V
CC
+ 0.3V)
Output Voltage
TS9001-1 ................................. (V
EE
- 0.3V) to (V
CC
+ 0.3V)
TS9001-2 ............................................... (V
EE
- 0.3V) to +6V
Current Into Input Pins ................................................ ±20mA
Output Current ............................................................ ±50mA
Output Short-Circuit Duration ............................................ 10s
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SC70 (Derate 2.5mW/°C above +70°C) ....... 200 mW
Operating Temperature Range ...................... -40°C to +85°C
Junction Temperature ................................................ +150°C
Storage Temperature Range ....................... -65°C to +150°C
Lead Temperature (soldering, 10s) ............................... +300°
Electrical and thermal stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These
are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections
of the specifications is not implied. Exposure to any absolute maximum rating conditions for extended periods may affect device reliability and
lifetime.
PACKAGE/ORDERING INFORMATION
ORDER NUMBER
PART
CARRIER QUANTITY
MARKING
TS9001-1IJ5
TS9001-2IJ5
TAF
TAG
Tape
& Reel
Tape
& Reel
3000
3000
Lead-free Program:
Touchstone Semiconductor supplies only lead-free packaging.
Please consult Touchstone Semiconductor for products specified with wider operating temperature ranges.
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TS9001
ELECTRICAL CHARACTERISTICS: TS9001-1/2
V
CC
= +5V, V
EE
= 0V, V
IN+
= V
REF
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C. See Note 1
PARAMETER
Supply Voltage Range
Supply Current
IN+ Voltage Range
Input Offset Voltage
Input-Referred Hysteresis
Input Bias Current
Power-Supply Rejection Ratio
SYMBOL
V
CC
I
CC
V
IN+
V
OS
V
HB
I
B
PSRR
CONDITIONS
Inferred from the
PSRR test
V
CC
= 1.6V
MIN
T
A
= T
MIN
to T
MAX
1.6
0.6
0.68
V
EE
- 0.2
2
4
0.15
TYP
MAX
5.5
1
1.30
1.60
V
CC
+ 0.2
5
10
1
2
1
300
400
150
200
110
50
200
300
100
150
0.002
60
6
90
10
12
15
25
50
21
28
3.5
2
1.2
T
A
= +25°C
T
A
= T
MIN
to T
MAX
BW = 10Hz to 100kHz
BW = 10Hz to 100kHz, C
REF
= 1nF
V
CC
= 1.6V to 5.5V
1.2395
1.2332
1.252
40
0.6
0.2
0.1
±0.2
1.2645
1.2708
µs
µs
ms
V
ppm/°C
mV
RMS
mV/V
mV/nA
1
μA
mA
mV
μA
V
mV
mV
nA
mV/V
UNITS
Output-Voltage Swing High
V
CC
- V
OH
Output-Voltage Swing Low
V
OL
Output Leakage Current
Output Short-Circuit Current
High-to-Low Propagation Delay
(Note 4)
I
LEAK
I
SC
t
PD
-
Low-to-High Propagation Delay
(Note 4)
t
PD+
Rise Time
Fall Time
Power-Up Time
Reference Voltage
Reference Voltage
Temperature Coefficient
Reference Output Voltage
Noise
Reference Line Regulation
Reference Load Regulation
t
RISE
t
FALL
t
ON
V
REF
TCV
REF
e
n
∆V
REF
/
∆V
CC
T
A
= +25°C
T
A
= +25°C
V
CC
= 5V
T
A
= T
MIN
to T
MAX
Inferred from the output swing test
T
A
= +25°C
(Note 2)
T
A
= T
MIN
to T
MAX
(Note 3)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
CC
= 1.6V to 5.5V, T
A
= T
MIN
to T
MAX
T
A
= +25°C
TS9001-1, V
CC
= 5V,
I
SOURCE
= 5mA
T
A
= T
MIN
to T
MAX
V
CC
= 1.6V,
T
A
= +25°C
TS9001-1,
I
SOURCE
= 1mA
V
CC
= 1.6V,
T
A
= T
MIN
to T
MAX
T
A
= +25°C
V
CC
= 5V, I
SINK
= 5mA
T
A
= T
MIN
to T
MAX
V
CC
= 1.6V,
T
A
= +25°C
I
SINK
= 1mA
V
CC
= 1.6V,
T
A
= T
MIN
to T
MAX
TS9001-2 only, V
O
= 5.5V
V
CC
= 5V
Sourcing, V
O
= V
EE
V
CC
= 1.6V
V
CC
= 5V
Sinking, V
O
= V
CC
V
CC
= 1.6V
V
CC
= 1.6V
V
CC
= 5V
V
CC
= 1.6V
TS9001-1 only
V
CC
= 5V
V
CC
= 1.6V,
R
PULLUP
= 100kΩ
TS9001-2 only
V
CC
= 5V,
R
PULLUP
= 100kΩ
TS9001-1 only, C
L
= 15pF
C
L
= 15pF
200
100
mV
µs
µs
∆V
REF
/
∆I
OUT
∆I
OUT
= 10nA
Note 1:
All specifications are 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaranteed by
device characterization, not production tested.
Note 2:
V
OS
is defined as the center of the hysteresis band at the input.
Note 3:
The hysteresis-related trip points are defined by the edges of the hysteresis band and measured with respect to the center of
the hysteresis band (i.e., V
OS
). See Figure 2.
Note 4:
The propagation delays are specified with an input overdrive (V
OVERDRIVE
) of 100mV and an output load capacitance of
C
L
= 15pF. V
OVERDRIVE
is defined above and is beyond the offset voltage and hysteresis of the comparator input. Reference
voltage error should also be included.
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TS9001
PIN FUNCTIONS
TS9001-1
TS9001-2
SC70-5
1
2
3
4
—
5
—
NAME
OUT
VEE
IN+
REF/IN-
REF
VCC
IN-
FUNCTION
Comparator Output
Negative Supply Voltage
Comparator Noninverting Input
1.252V Reference Output/Comparator Inverting Input
1.252V Reference Output
Positive Supply Voltage
Comparator Inverting Input
BLOCK DIAGRAMS
DESCRIPTION OF OPERATION
Guaranteed to operate from +1.6V supplies, the
TS9001-1 and the TS9001-2 analog comparators
only draw 600nA supply current, feature a robust
input stage that can tolerate input voltages 200mV
beyond the power supply rails, and include an on-
board +1.252V ±1% voltage reference. To insure
clean output switching behavior, both analog
comparators feature 4mV internal hysteresis. The
TS9001-1’s push-pull output drivers were designed
to minimize supply-current surges while driving
±5mA loads with rail-to-rail output swings. The open-
drain output stage TS9001-2 can be connected to
supply voltages above V
CC
to an absolute maximum
of 6V above V
EE
. Where wired-OR logic connections
are needed, their open-drain output stages make it
easy to use this analog comparator.
Input Stage Circuitry
The robust design of the analog comparators’ input
stage can accommodate any differential input
voltage from V
EE
- 0.2V to V
CC
+ 0.2V. Input bias
currents are typically ±0.15nA so long as the applied
input voltage remains between the supply rails. ESD
protection diodes - connected internally to the supply
rails - protect comparator inputs against overvoltage
conditions. However, if the applied input voltage
exceeds either or both supply rails, an increase in
input current can occur when these ESD protection
diodes start to conduct.
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TS9001DS r1p0
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TS9001
Output Stage Circuitry
Many conventional analog comparators can draw
orders of magnitude higher supply current when
switching. Because of this behavior, additional
power supply bypass capacitance may be required
to provide additional charge storage during
switching. The design of the TS9001-1’s rail-to-rail
output stage implements a technique that virtually
eliminates supply-current surges when output
transitions occur. The supply-current change as a
function of output transition frequency exhibited by
these analog comparators is very small. Material
benefits of this attribute to battery-power
applications are the increase in operating time and
in reducing the size of power-supply filter capacitors.
Internal Voltage Reference
The TS9001-1/2’s internal +1.252V voltage
reference exhibits a typical temperature coefficient
of 40ppm/°C over the full -40°C to +85°C
temperature range. An equivalent circuit for the
reference section is illustrated in Figure 1. Since the
output impedance of the voltage reference Is
typically 200kΩ, its output can be bypassed with a
low-leakage capacitor and is stable for any
capacitive load.
Figure 1:
TS9001’s Internal V
REF
Output
Equivalent Circuit
An external buffer – such as the TS1001 – can be
used to buffer the voltage reference output for higher
output current drive or to reduce reference output
impedance.
APPLICATIONS INFORMATION
Low-Voltage, Low-Power Operation
Because they were designed specifically for low-
power, battery-operated applications, the TS9001-
1/2 comparators are an excellent choice. Under
nominal conditions, approximate operating times for
this analog comparator family is illustrated in Table 1
for a number of battery types and their
corresponding charge capacities.
Internal Hysteresis
As a result of circuit noise or unintended parasitic
feedback, many analog comparators often break into
oscillation within their linear region of operation
Table 1: Battery Applications using the TS9001
BATTERY TYPE
Alkaline (2 Cells)
Nickel-Cadmium (2 Cells)
Lithium-Ion (1 Cell)
Nickel-Metal- Hydride
(2 Cells)
RECHARGEABLE
No
Yes
Yes
Yes
V
FRESH
(V)
3.0
2.4
3.5
2.4
V
END-OF-LIFE
(V)
1.8
1.8
2.7
1.8
CAPACITY, AA
SIZE (mA-h)
2000
750
1000
1000
TS9001/TSM9003
OPERATING TIME
(hrs)
6
2.5 x 10
937,500
1.25 x 10
1.25 x 10
6
6
especially when the applied differential input voltage
approaches 0V (zero volt). Externally-introduced
hysteresis is a well-established technique to
stabilizing analog comparator behavior and requires
external components. As shown in Figure 2, adding
comparator hysteresis creates two trip points: V
THR
(for the rising input voltage) and V
THF
(for the falling
input voltage). The hysteresis band (V
HB
) is defined
as the voltage difference between the two trip points.
When a comparator’s input voltages are equal,
hysteresis effectively forces one comparator input to
move quickly past the other input, moving the input
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