Linear Technology LTC1442IN8, LTC1442CS8, LTC1441IS8, LTC1440IS8, LTC1440IN8 Datasheet

LTC1440/LTC1441/LTC1442

Ultralow Power Single/Dual

Comparator with Reference

FEATURES

■Ultralow Quiescent Current: 2.1μA Typ (LTC1440)

■Wide Supply Range:

Single: 2V to 11V

Dual: ±1V to ±5.5V

■Input Voltage Range Includes the Negative Supply

■Reference Output Drives 0.01μF Capacitor

■Adjustable Hysteresis (LTC1440/LTC1442)

■TTL/CMOS Compatible Outputs

■12μs Propagation Delay with 10mV Overdrive

■No Crowbar Current

■40mA Continuous Source Current

■Pin Compatible Upgrades for MAX921/922/923

APPLICATIOUS

■Battery-Powered System Monitoring

■Threshold Detectors

■Window Comparators

■Oscillator Circuits

,LTC and LT are registered trademarks of Linear Technology Corporation.

DESCRIPTIOU

The LTC®1440/LTC1441/LTC1442 are ultralow power single and dual comparators with built-in references. The comparators feature less than 3.7μA supply current over temperature (LTC1440), a 1.182V ±1% reference, programmablehysteresis(LTC1440/LTC1442)andTTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to 0.01μF without oscillation.

The comparators operate from a single 2V to 11V supply or a dual ±1V to ±5.5V supply (LTC1440). Comparator hysteresis is easily programmed by using two resistors and the HYST pin (LTC1440/LTC1442). Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated.

The LTC1440 is available in 8-pin PDIP, SO and MSOP packages. The LTC1441/LTC1442 are available in 8-pin PDIP and SO packages.

TYPICAL APPLICATIOU

Micropower 2.9V VCC Threshold Detector LTC1440 Supply Current vs Temperature

			3.3V
R1			7
1.65M			V +
1%	3	IN+
		+			A)
R2			8		(μ
				OUT	CURRENT
1.13M		IN–
	4
1%		–			SUPPLY
	5	HYST
	6	REF	LTC1440
		V –	GND
		2	1
			1440 TA01

5.0 V+ = 5V

4.5 V– = GND = 0V

4.0

3.5

3.0

2.5

2.0

1.5

–40	–20	0	20	40	60	80	100
		TEMPERATURE (°C)

1440/1/2 TA02

1

LTC1440/LTC1441/LTC1442

ABSOLUTE WAXIWUW RATINGSU

Voltage
V + to V –, V + to GND, GND to V – ...........		12V to – 0.3V
IN+, IN –, HYST .................	(V + + 0.3V) to (V – – 0.3V)
REF ...................................	(V + + 0.3V) to (V – – 0.3V)
OUT (LTC1440) ..............	(V + + 0.3V) to (GND – 0.3V)
OUT (LTC1441/LTC1442)	... (V+ + 0.3V) to (V – – 0.3V)
Current
IN+, IN –, HYST .................................................		20mA
REF ...................................................................		20mA
OUT ..................................................................		50mA

OUT Short-Circuit Duration (V + ≤ 5.5V)	...... Continuous
Power Dissipation.............................................	500mW
Operating Temperature Range	0°C to 70°C
LTC144XC ..............................................
LTC144XI ..........................................	– 40°C to 85°C
Storage Temperature Range ................	– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................	300°C

PACKAGE/ORDER IUFORWATIOU

TOP VIEW

ORDER PART NUMBER

ORDER PART NUMBER

TOP VIEW

GND

OUT

LTC1440CN8

LTC1440CMS8

1

8

–

+

GND

1

8 OUT

V

2

7

V

LTC1440CS8

V–

2

7 V+

IN+

REF

LTC1440IN8

IN–

4

5

HYST

3

6

IN+

3

6

REF

IN–

HYST

LTC1440IS8

4

5

MS8 PACKAGE

8-LEAD PLASTIC MSOP

N8 PACKAGE

S8 PACKAGE

S8 PART MARKING

MS8 PART MARKING

8-LEAD PDIP

8-LEAD PLASTIC SO

TJMAX = 150°C, θJA = 250°C/ W

TJMAX = 150°C, θJA = 130°C/ W (N8)

1440

LTBX

TJMAX = 150°C, θJA

= 175°C/ W (S8)

1440I

TOP VIEW

ORDER PART NUMBER

TOP VIEW

ORDER PART NUMBER

LTC1441CN8

OUT A

OUT B

LTC1442CN8

OUT A

1

8

OUT B

1

8

V–

V+

LTC1441CS8

V–

V+

LTC1442CS8

2

7

2

7

IN A+

IN B+

LTC1441IN8

IN A+

REF

LTC1442IN8

3

6

3

6

IN A–

IN B–

LTC1441IS8

IN B–

HYST

LTC1442IS8

4

5

4

5

N8 PACKAGE

S8 PACKAGE

N8 PACKAGE

S8 PACKAGE

S8 PART MARKING

S8 PART MARKING

8-LEAD PDIP

8-LEAD PLASTIC SO

8-LEAD PDIP 8-LEAD PLASTIC SO

TJMAX = 150°C, θJA = 130°C/ W (N8)

1441

TJMAX = 150°C, θJA = 130°C/ W (N8)

1442

°

θ

°

1441I

TJMAX = 150°C, θJA = 175°C/ W (S8)

1442I

TJMAX = 150 C,

JA = 175 C/ W (S8)

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS V + = 5V, V – = GND = 0V, TA = 25°C unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power

Supply

V +

Supply Voltage Range

●

2.0

11.0

V

ICC

Supply Current

IN+ = IN – = 80mV

LTC1440

●

2.1

3.7

μA

HYST = REF (LTC1440/LTC1442)

LTC1441

●

3.5

5.7

μA

LTC1442

●

3.5

5.7

μA

2

LTC1440/LTC1441/LTC1442

ELECTRICAL CHARACTERISTICS

V + = 5V, V – = GND = 0V, TA = 25°C unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Comparator

VOS

Comparator Input Offset Voltage

VCM = 2.5V

●

±3

±10

mV

I

IN

Input Leakage Current (IN +, IN –)

V

+ = V

– = 2.5V

●

±0.01

±1.0

nA

Input Leakage Current (HYST)

IN

IN

±0.02

±1.0

nA

●

V

Comparator Input Common Mode Range

●

V –

V + – 1.3V

V

CM

CMRR

Common Mode Rejection Ratio

V – to V + – 1.3V

0.1

1

mV/V

PSRR

Power Supply Rejection Ratio

V + = 2V to 11V

0.1

1

mV/V

NOISE

Voltage Noise

100Hz to 100kHz

100

μVRMS

VHYST

Hysteresis Input Voltage Range

LTC1440/LTC1442

●

REF – 50mV

REF

V

tPD

Propagation Delay

COUT = 100pF

Overdrive = 10mV

15

μs

Overdrive = 100mV

8

μs

V

Output High Voltage

I

O

= – 13mA

●

V + – 0.4V

V

OH

VOL

Output Low Voltage

IO = 1.8mA

LTC1440

●

GND + 0.4V

V

LTC1441/LTC1442

●

V – + 0.4V

V

Reference

VREF

Reference Voltage

No Load

C Temp Range

●

1.170

1.182

1.194

V

LTC1440/LTC1442

I Temp Range

●

1.164

1.200

V

No Load LTC1440 (MSOP)

C Temp Range

●

1.164

1.200

V

ISOURCE

Reference Output Source Current

VREF ≤ 1mV (LTC1442)

●

100

200

μA

ISINK

Reference Output Sink Current

VREF ≤ 2.5mV (LTC1442)

10

20

μA

VREF

Reference Source Current

0 ≤ ISOURCE ≤ 2mA (LTC1440)

●

0.8

5

mV

Reference Sink Current

0 ≤ ISINK ≤ 10μA (LTC1440)

0.5

1.5

mV

●

5

mV

NOISE

Voltage Noise

100Hz to 100kHz

100

μVRMS

V + = 3V,

V – = GND = 0V, TA = 25°C unless otherwise noted.

Power

Supply

V +

Supply Voltage Range

●

2

11

V

ICC

Supply Current

IN + = IN – = 80mV

LTC1440

●

2

3.6

μA

HYST = REF (LTC1440/LTC1442)

LTC1441

●

3.5

5.7

μA

LTC1442

●

3.5

5.7

μA

Comparator

VOS

Comparator Input Offset Voltage

VCM = 1.5V

●

±3

±10

mV

I

IN

Input Leakage Current (IN +, IN –)

V

+ = V –

= 1.5V

●

±0.01

±1

nA

Input Leakage Current (HYST)

IN

IN

±0.02

±1

nA

●

V

Comparator Input Common Mode Range

●

V –

V + – 1.3V

V

CM

CMRR

Common Mode Rejection Ratio

V – to V + – 1.3V

0.1

1

mV/V

PSRR

Power Supply Rejection Ratio

V + = 2V to 11V

0.1

1

mV/V

NOISE

Voltage Noise

100Hz to 100kHz

100

μVRMS

VHYST

Hysteresis Input Voltage Range

LTC1440/LTC1442

●

REF – 50mV

REF

V

tPD

Propagation Delay

COUT = 100pF

Overdrive = 10mV

14

μs

Overdrive = 100mV

5

μs

V

Output High Voltage

I

O

= – 8mA

●

V + – 0.4V

V

OH

VOL

Output Low Voltage

IO = 0.8mA

LTC1440

●

GND + 0.4V

V

LTC1441/LTC1442

●

V – + 0.4V

V

3

LTC1440/LTC1441/LTC1442

ELECTRICAL CHARACTERISTICS V + = 3V, V – = GND = 0V, TA = 25°C unless otherwise noted.

SYMBOL		PARAMETER	CONDITIONS			MIN	TYP	MAX	UNITS
Reference
VREF		Reference Voltage	No Load	C Temp Range	●	1.170	1.182	1.194		V
			LTC1440/LTC1442	I Temp Range	●	1.164		1.200		V
			No Load LTC1440 (MSOP)	C Temp Range	●	1.164		1.200		V
ISOURCE		Reference Output Source Current	VREF ≤ 1mV (LTC1442)		●	60	120			μA
ISINK		Reference Output Sink Current	VREF ≤ 2.5mV (LTC1442)			10	20			μA
VREF		Reference Source Current	0 ≤ ISOURCE ≤ 1mA (LTC1440)		●		0.8	5.5		mV
		Reference Sink Current	0 ≤ ISINK ≤ 10μA (LTC1440)				0.5	1.5		mV
					●			5		mV
NOISE		Voltage Noise	100Hz to 100kHz				100		μVRMS

The ● denotes specifications which apply over the full operating temperature range.

TYPICAL PERFORWAUCE CHARACTERISTICS

Comparator Response Time vs

Input Overdrive

	(V)	5	TA = 25°C
		4			100mV		10mV
	VOLTAGE
		3		50mV			20mV
		2
	OUTPUT
		1
	(mV)	0
	VOLTAGE	0
		100
	INPUT
		–1	0	2	4	6	8	10
				RESPONSE TIME ( s)

1440/1/2 G01

Comparator Response Time vs	Comparator Short-Circuit Sink
Input Overdrives	Current vs Supply Voltage

(V)	5												200
		TA = 25°C											180	TA = 25°C
VOLTAGE (mV) OUTPUT VOLTAGE	4
			100mV		50mV
	3												160
							20mV
												SINK CURRENT (mA)
	2							10mV					140		OUT CONNECTED TO V+
													120
	1
													100
	0
													80
													60
	100												40
	0												20
INPUT
	–1	0	2	4	6	8	10	12	14	16	18		0	1	2	3	4	5	6	7	8	9	10
													0
				RESPONSE TIME ( s)												SUPPLY VOLTAGE (V)
									1440/1/2 G02													1440/1/2 G03

	Comparator Response Time vs
Comparator Short-Circuit Source	Load Capacitance with 100mV
Current vs Supply Voltage	Input Overdrive

	160							12
	140
(mA)	120							10		tPHL
							( s)
			OUT CONNECTED TO
CURRENTSOURCE	100						TIMERESPONSE
			V	– = GND = 0V				8
	80
	60							6	tPLH
	40							4
	20
	0	1	2		4	5		2	20		60
	0			3				0		40		80	100
			SUPPLY VOLTAGE (V)							LOAD CAPACITANCE (nF)

Comparator Response Time at

Low Supply Voltage

10000
s)	1000
(
TIME					20mV OVERDRIVE
	100
RESPONSE
	10
			100mV OVERDRIVE
	1
	1.0	1.1	1.2	1.3	1.4	1.5	1.6
			SUPPLY VOLTAGE (V)

1440/1/2 G04

1440/1/2 G05

1440/1/2 G06

4