Linear Technology LTC2910, LTC2910IGN Datasheet

LTC2910

1

2910fc

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Octal Positive/Negative

Voltage Monitor

The LTC®2910 is an octal input voltage monitor intended
for monitoring multiple voltages in a variety of applica­tions. Each input has a nominal 0.5V threshold, featuring

1.5% tight threshold accuracy over the entire operating
temperature range. Glitch fi ltering ensures reliable reset
operation without false or noisy triggering.

Polarity selection and a buffered reference allow monitor­ing up to two separate negative voltages. A three state
input pin allows setting the polarity of two inputs without
requiring any external components.

The LTC2910 provides a precise, versatile, space-con­scious, micropower solution for voltage monitoring.

Octal Supply Monitor, 10% Tolerance, 12V, 5V (x2), 3.3V (x2), 2.5V, 1.8V, 1.2V

■

8 Low Voltage Adjustable Inputs (0.5V)

■

Guaranteed Threshold Accuracy: ±1.5%

■

Input Glitch Rejection

■

Pin Selectable Input Polarity Allows

Negative and OV Monitoring

■

Buffered 1V Reference Output

■

Adjustable Reset Timeout with Timeout Disable

■

50μA Quiescent Current

■

Open Drain RST and RST Outputs

■

Guaranteed RST and RST for VCC ≥ 1V

■

Available in 16-Lead SSOP and 16-Lead

(5mm × 3mm) DFN Packages

■

Desktop and Notebook Computers

■

Network Servers

■

Core, I/O Voltage Monitors

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.

Typical Transient Duration

vs Comparator Overdrive

RSTRSTGND

V8 V7 V6 V5 V4 V3 V2 V1

LTC2910

TMR

V

CC

1nF
TIMEOUT = 8.5ms

DIS SEL

226k

0.1μF

88.7k54.9k39.2k24.9k12.7k88.7k54.9k

11k

11k 11k 11k 11k 11k 11k 11k

12V

5V

3.3V

2.5V

1.8V

1.2V

5V

3.3V

2910 TA01

POWER

SUPPLIES

SYSTEM

COMPARATOR OVERDRIVE PAST THRESHOLD (%)

0.1

400

TYPICAL TRANSIENT DURATION (μs)

500

600

700

1 10 100

2910 TA01b

300

200

100

0

VCC = 6V

RESET OCCURS

ABOVE CURVE

VCC = 2.3V

LTC2910

2

2910fc

PACKAGE/ORDER INFORMATION

ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

Terminal Voltages

V

CC

(Note 3) ............................................. –0.3V to 6V

RST, RST ................................................ –0.3V to 16V

TMR ..........................................–0.3V to (V

CC

+ 0.3V)

Vn, DIS, SEL ......................................... –0.3V to 7.5V

Terminal Current

I

VCC

....................................................................10mA

Reference Load Current (I

REF

) ...........................±1mA

I

RST/RST

..............................................................10mA

(Note 1, 2)

16

15

14

13

12

11

10

9

17

1

2

3

4

5

6

7

8

V

CC

TMR

SEL

DIS

RST

RST

REF

GND

V1

V2

V3

V4

V5

V6

V7

V8

TOP VIEW

DHC16 PACKAGE

16-LEAD

(

5mm × 3mm) PLASTIC DFN

T

JMAX

= 150°C, θJA = 43.5°C/W

EXPOSED PAD (PIN 17) PCB GND CONNECTION OPTIONAL

GN16 PACKAGE

16-LEAD PLASTIC SSOP

1

2

3

4

5

6

7

8

TOP VIEW

16

15

14

13

12

11

10

9

V1

V2

V3

V4

V5

V6

V7

V8

V

CC

TMR

SEL

DIS

RST

RST

REF

GND

T

JMAX

= 150°C, θJA = 110°C/W

ORDER PART NUMBER DHC16 PART MARKING* ORDER PART NUMBER GN16 PART MARKING*

LTC2910CDHC
LTC2910IDHC
LTC2910HDHC

2910
2910
2910

LTC2910CGN
LTC2910IGN
LTC2910HGN

2910
2910I
2910H

Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/

*The temperature grade is identifi ed by a label on the shipping container.

The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. VCC = 3.3V, Vn = 0.55V, SEL = VCC, DIS = OPEN unless otherwise noted.
(Note 2)

Operating Temperature Range

LTC2910C ................................................ 0°C to 70°C

LTC2910I.............................................. –40°C to 85°C

LTC2910H .......................................... –40°C to 125°C

Storage Temperature Range

SSOP, DFN .......................................... –65°C to 150°C

Lead Temperature (Soldering, 10 sec)

SSOP ................................................................ 300°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

SHUNT

VCC Shunt Regulator Voltage ICC = 5mA

●

6.2 6.6 6.9 V

–40°C < T

A

<125°C

●

6.2 6.6 7.0 V

ΔV

SHUNT

VCC Shunt Regulator Load Regulation ICC = 2mA to 10mA

●

200 300 mV

V

CC

Supply Voltage

●

2.3 V

SHUNT

V

LTC2910

3

2910fc

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC(MIN)

Minimum VCC Output Valid DIS = 0V

●

1V

V

CC(UVLO)

Supply Undervoltage Lockout VCC Rising, DIS = 0V

●

1.9 2 2.1 V

ΔV

CC(UVHYST)

Supply Undervoltage Lockout Hysteresis DIS = 0V

●

52550 mV

I

CC

Supply Current VCC = 2.3V to 6V

●

50 100 μA

V

REF

Reference Output Voltage I

VREF

= ±1mA

●

0.985 1 1.015 V

–40°C < T

A

< 125°C

●

0.985 1 1.020 V

V

RT

Vn Input Voltage Threshold

●

492 500 508 mV

t

PROP

Vn Input Threshold to Output Delay Vn = VRT – 5mV

●

50 125 500 μs

I

VN

Vn Input Current

●

±15 nA

–40°C < T

A

< 125°C

●

±30 nA

t

RST

Reset Timeout Period C

TMR

= 1nF

●

6 8.5 12.5 ms

–40°C < T

A

< 125°C

●

6 8.5 14 ms

V

DIS(VIH)

DIS Input Threshold Voltage High

●

1.2 V

V

DIS(VIL)

DIS Input Threshold Voltage Low

●

0.8 V

I

DIS

DIS Input Current V

DIS

> 0.5V

●

123 μA

I

TMR(UP)

TMR Pull-Up Current V

TMR

= 0V

●

–1.3 –2.1 –2.8 μA

–40°C < T

A

< 125°C

●

–1.2 –2.1 –2.8 μA

I

TMR(DOWN)

TMR Pull-Down Current V

TMR

= 1.6V

●

1.3 2.1 2.8 μA

–40°C < T

A

< 125°C

●

1.2 2.1 2.8 μA

V

TMR(DIS)

Timer Disable Voltage Referenced to V

CC

●

–180 –270 mV

V

OH

Output Voltage High RST/RST VCC = 2.3V, I

RST/RST

= –1μA

●

1V

V

OL

Output Voltage Low RST/RST VCC = 2.3V, I

RST/RST

= 2.5mA

V

CC

= 1V, I

RST

= 100μA

●

0.1

0.01

0.3

0.15

V
V

Three-State Input SEL

V

IL

Low Level Input Voltage

●

0.4 V

V

IH

High Level Input Voltage

●

1.4 V

V

Z

Pin Voltage when Left in Hi-Z State I

SEL

= ±10μA

●

0.6 0.9 1.1 V

–40°C < T

A

< 125°C

●

0.6 0.9 1.2 V

I

SEL

SEL High, Low Input Current

●

±25 μA

I

SEL(MAX)

Maximum SEL Input Current SEL tied to either VCC or GND

●

±30 μA

ELECTRICAL CHARACTERISTICS

The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. VCC = 3.3V, Vn = 0.55V, SEL = VCC, DIS = OPEN unless otherwise noted.
(Note 2)

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.

Note 2: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.

Note 3: V

CC

maximum pin voltage is limited by input current. Since the

V

CC

pin has an internal 6.5V shunt regulator, a low impedance supply that
exceeds 6V may exceed the rated terminal current. Operation from higher
voltage supplies requires a series dropping resistor. See Applications
Information.

LTC2910

4

2910fc

TIMING DIAGRAM

t

PROP

t

RST

2910 TD01

Vn V

RT

RST

RST

1V

1V

t

PROP

t

RST

2910 TD02

Vn V

RT

RST

RST

1V

1V

t

PROP

t

PROP

2910 TD03

Vn V

RT

RST

RST

1V

1V

t

PROP

t

PROP

2910 TD04

Vn V

RT

RST

RST

1V

1V

Vn Positive Monitor Timing

Vn Negative Monitor Timing

Vn Positive Monitor Timing (TMR strapped to VCC)

Vn Negative Monitor Timing (TMR strapped to VCC)

LTC2910

5

2910fc

SUPPLY VOLTAGE, VCC (V)

0

RST VOLTAGE (V)

3

4

5

4

2910 G09

2

1

0

123

5

Vn = 0.55V
SEL = V

CC

TEMPERATURE (°C)

–50

6

RST/RST TIMEOUT PERIOD, t

RST

(ms)

7

8

9

10

12

–25 0 25 50

2910 G07

75 100

11

C

TMR

= 1nF

SUPPLY VOLTAGE, VCC (V)

0

RST VOLTAGE (V)

0.4

0.6

0.8

2910 G08

0.2

0

0.2 0.4 0.6

1.0

0.8

V

CC

RST WITH
10k PULL-UP

RST WITHOUT
10k PULL-UP

ICC (mA)

–2 0

6.25

V

CC

(V)

6.45

6.75

268

2910 G04

6.35

6.65

6.55

41012

25°C

–40°C

85°C

TEMPERATURE (°C)

–50

0.995

REFERENCE VOLTAGE, V

REF

(V)

0.997

0.999

1.001

–25 0 25 50

2910 G05

75

1.003

1.005

0.996

0.998

1.000

1.002

1.004

100

COMPARATOR OVERDRIVE PAST THRESHOLD (%)

0.1

400

TYPICAL TRANSIENT DURATION (μs)

500

600

700

1 10 100

2910 G06

300

200

100

0

VCC = 6V

RESET OCCURS

ABOVE CURVE

VCC = 2.3V

TEMPERATURE (°C)

–50

0.495

THRESHOLD VOLTAGE, V

RT

(V)

0.497

0.499

0.501

–25 0 25 50

2910 G01

75

0.503

0.505

0.496

0.498

0.500

0.502

0.504

100

TEMPERATURE (°C)

–50 50 75–25 25

I

CC

(μA)

40

35

50

45

0

2910 G02

100

65

60

55

VCC = 5V

VCC = 3.3V

VCC = 2.3V

TEMPERATURE (°C)

–50

6.2

V

CC

(V)

6.3

6.4

6.5

6.6

6.8

–25 0 25 50

2910 G03

75 100

6.7

200μA

1mA

2mA

5mA

10mA

TYPICAL PERFORMANCE CHARACTERISTICS

Input Threshold Voltage vs
Temperature Supply Current vs Temperature

VCC Shunt Voltage vs
Temperature

VCC Shunt Voltage vs I

CC

Buffered Reference Voltage vs
Temperature

Transient Duration vs Comparator
Overdrive

Reset Time-Out Period vs
Temperature RST Output Voltage vs V

CC

RST Output Voltage vs V

CC

Specifi cations are at TA = 25°C and VCC = 3.3V
unless otherwise noted. (Note 2)