LTC2918IDDB-A1#TRMPBF Datasheet LTC2918CMS-A1#PBF, LTC2918IMS-A1#PBF, LTC2918HMS-A1#PBF | P4-P6

LTC2917/LTC2918

4

29178fb

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC(MIN)

Minimum Supply Voltage RST in Correct Logic State

●

0.8 V

V

CC(UVLO)

Supply Undervoltage Lockout

●

1.5 V

V

CC(SHUNT)

Shunt Regulation Voltage I

VCC

= 0.5mA

●

5.7 6.2 7.0 V

I

CC

V

CC

Pin Current SEL1, SEL2, TOL, MR = Open

SEL1, SEL2, TOL = GND (LTC2917)

MR = V

CC

(LTC2918)

●

30

45

50

80

μA

Monitor Input (VM)

V

MT120

12V, 5% Reset Threshold

12V, 10% Reset Threshold

12V, 15% Reset Threshold

●

11.04

10.44

9.84

11.22

10.62

10.02

11.40

10.80

10.20

V

MT50

5V, 5% Reset Threshold

5V, 10% Reset Threshold

5V, 15% Reset Threshold

●

4.600

4.350

4.100

4.675

4.425

4.175

4.750

4.500

4.250

V

MT33

3.3V, 5% Reset Threshold

3.3V, 10% Reset Threshold

3.3V, 15% Reset Threshold

●

3.036

2.871

2.706

3.086

2.921

2.756

3.135

2.970

2.805

V

MT25

2.5V, 5% Reset Threshold

2.5V, 10% Reset Threshold

2.5V, 15% Reset Threshold

●

2.300

2.175

2.050

2.338

2.213

2.088

2.375

2.250

2.125

V

MT18

1.8V, 5% Reset Threshold

1.8V, 10% Reset Threshold

1.8V, 15% Reset Threshold

●

1.656

1.566

1.476

1.683

1.593

1.503

1.710

1.620

1.530

V

MT15

1.5V, 5% Reset Threshold

1.5V, 10% Reset Threshold

1.5V, 15% Reset Threshold

●

1.380

1.305

1.230

1.403

1.328

1.253

1.425

1.350

1.275

V

MT12

1.2V, 5% Reset Threshold

1.2V, 10% Reset Threshold

1.2V, 15% Reset Threshold

●

1.104

1.044

0.984

1.122

1.062

1.002

1.140

1.080

1.020

V

MT10

1V, 5% Reset Threshold

1V, 10% Reset Threshold

1V, 15% Reset Threshold

●

0.920

0.870

0.820

0.935

0.885

0.835

0.950

0.900

0.850

V

MTADJ

ADJ (0.5V), 5% Reset Threshold

ADJ (0.5V), 10% Reset Threshold

ADJ (0.5V), 15% Reset Threshold

●

460.0

435.0

410.0

467.5

442.5

417.5

475.0

450.0

425.0

mV

R

VM

VM Input Impedance (Note 4) Fixed Threshold Modes

●

0.5 8

MΩ

I

VM(ADJ)

ADJ Input Current VM = 0.5V

●

±15 nA

Three-State Inputs (SEL1, SEL2), (TOL, LTC2917)

V

TPIN,LOW

Low Level Input Voltage

●

0.5 V

V

TPIN,HIGH

High Level Input Voltage

●

1.4 V

V

TPIN,Z

Pin Voltage when Open I = 0μA 0.9 V

I

TPIN,Z

Allowable Leakage in Open State

●

±5 μA

I

TPIN,H/L

Pin Input Current V

TPIN

= 0V, V

CC

●

±20 μA

Reset Timer Control (RT)

I

RT(UP)

RT Pull-Up Current V

RT

= 0.25V

●

–2 –3 –4 μA

I

RT(DOWN)

RT Pull-Down Current V

RT

= 1.1V

●

234μA

I

RT(INT)

Internal RT V

CC

Detect Current V

RT

= V

CC

●

18μA

V

RT(INT, LH)

RT Internal Timer Threshold V

RT

Rising, Referenced to V

CC

●

–100 –160 –300 mV

The ● denotes the speciﬁ cations which apply over the full operating

temperature range, otherwise speciﬁ cations are at T

A

= 25°C. V

CC

= 2.5V, unless otherwise noted. (Note 2)

LTC2917/LTC2918

5

29178fb

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Reset Output (RST)

t

RST(INT)

Internal Reset Timeout Period V

RT

= V

CC

●

150 200 260 ms

t

RST(EXT)

Adjustable Reset Timeout Period C

RT

= 2.2nF

●

16 20 25 ms

t

UV

VM Undervoltage Detect to RST

Asserted

VM Less Than Reset Threshold

V

MTX

by More Than 5%

●

10 80 150 μs

V

OL

Output Voltage Low RST V

CC

= 3.3V, I

RST

= 2.5mA

V

CC

= 1V, I

RST

= 100μA

V

CC

= 0.8V, I

RST

= 15μA

●

0.15

0.05

0.4

0.3

0.2

V

I

OH(RST)

RST Output Voltage High Leakage RST = V

CC

●

±1 μA

Watchdog Timer Control (WT)

I

WT(UP)

WT Pull-Up Current V

WT

= 0.25V

●

–2 –3 –4 μA

I

WT(DOWN)

WT Pull-Down Current V

WT

= 1.1V

●

234μA

V

WT(INT, LH)

WT Internal Timer Threshold V

WT

Rising, Referenced to V

CC

●

–100 –160 –300 mV

I

WT(INT)

Internal WT V

CC

Detect Current V

WT

= V

CC

●

18μA

I

WT(DIS)

Watchdog Disable Hold Current V

WT

= 0V –3.5 μA

Watchdog Input (WDI)

t

WDU(INT)

Internal Watchdog Upper Boundary V

WT

= V

CC

●

1.3 1.6 2 s

t

WDL(INT)

Internal Watchdog Lower Boundary

(Note 5)

B Versions, V

WT

= V

CC

●

37.5 50 62.5 ms

t

WDU(EXT)

External Watchdog Upper Boundary C

WT

= 2.2nF

●

130 160 200 ms

t

WDL(EXT)

External Watchdog Lower Boundary

(Note 5)

B Versions, C

WT

= 2.2nF

●

t

WDU(EXT)

/32 ms

V

IL(WDI)

Input Low Voltage

●

0.4 V

V

IH(WDI)

Input High Voltage

●

1.1 V

t

PW(WDI)

Input Pulsewidth

●

400 ns

WDI Leakage Current

●

±1 μA

Manual Reset Input (LTC2918)

V

IL(MR)

Input Low Voltage

●

0.2 • V

CC

V

IH(MR)

Input High Voltage

●

0.8 • V

CC

V

R

PU

Pull-Up Resistance

●

50 100 150

kΩ

t

PW(MR)

Pulsewidth

●

250 ns

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 6.2V shunt regulator, a low impedance supply

which exceeds 5.7V may exceed the rated terminal current. Operation

ELECTRICAL CHARACTERISTICS

The ● denotes the speciﬁ cations which apply over the full operating

temperature range, otherwise speciﬁ cations are at T

A

= 25°C. V

CC

= 2.5V, unless otherwise noted. (Note 2)

from higher voltage supplies requires a series dropping resistor. See

Applications Information.

Note 4: Input impedance is dependent on the conﬁ guration of the SEL

pins.

Note 5: In the LTC2917-B/LTC2918-B, edges must occur on WDI with a

period between the lower and upper boundary or RST is invoked. For the

LTC2917-A/LTC2918-A, the edges must simply occur before the upper

boundary. See Applications Information.

LTC2917/LTC2918

6

29178fb

TEMPERATURE (°C)

–50

NORMALIZED V

MTnn

(%)

0.5

1.0

1.5

25 75

29178 G01

0

–0.5

–25 0

50 100 125

–1.0

–1.5

V

MT120

V

MTADJ

V

MT25

TEMPERATURE (°C)

–50

20

QUIESCENT SUPPLY CURRENT, I

CC

(μA)

25

30

35

40

–25 0 25 50

29178 G02

75 100 125

SEL1 = 0V

SEL2 = 2.5V

TOL = OPEN

V

CC

= 5.5V

V

CC

= 2.5V

V

CC

= 1.5V

GLITCH PERCENTAGE PAST THRESHOLD (%)

0.1

0

MAXIMUM ALLOWABLE GLITCH DURATION (μs)

200

250

300

1 10 100

29178 G03

150

100

50

RESET OCCURS

ABOVE CURVE

TEMPERATURE (°C)

–50 –25

150

RESET TIMEOUT PERIOD, t

RST(INT)

(ms)

190

250

0

50

75

29178 G05

170

230

210

25

100

125

RT = V

CC

TEMPERATURE (°C)

–50 –25

1.0

WATCHDOG TIMEOUT PERIOD, t

WDU(INT)

(ms)

1.4

2.0

0

50

75

29178 G06

1.2

1.8

1.6

25

100

125

WT = V

CC

WT PIN CAPACITANCE, C

WT

(nF)

0.001

1

WATCHDOG TIMEOUT PERIOD, t

WDU(EXT)

(ms)

100

10000

1100.10.01 100

29178 G07

10

1000

SUPPLY CURRENT, I

CC

(mA)

0.01

SHUNT REGULATION VOLTAGE, V

CC(SHUNT)

(V)

6.4

6.6

100

29178 G09

6.2

6.0

0.1

1

10

7.0

6.8

TYPICAL PERFORMANCE CHARACTERISTICS

Threshold Voltage vs

Temperature

Quiescent Supply Current vs

Temperature

Allowable Glitch Duration vs

Magnitude

Reset Timeout Period vs RT

Capacitance

Internal Reset Timeout Period vs

Temperature

Internal Watchdog Timeout

Period vs Temperature

Watchdog Timeout Period vs

Capacitance

Shunt Regulation Voltage vs

Temperature

Shunt Regulation Voltage vs

Supply Current

RT PIN CAPACITANCE, C

RT

(nF)

0.001

0.1

RESET TIMEOUT PERIOD, t

RST(EXT)

(ms)

10

10000

0.10.01 1 10 100 1000

29178 G04

1

100

1000

TEMPERATURE (°C)

–50

6.1

SHUNT REGULATION VOLTAGE, V

CC(SHUNT)

(V)

6.2

6.3

6.4

–25 0 25 50

29178 G08

75 100 125

I

CC

= 5mA

I

CC

= 1mA

I

CC

= 100μA

LTC2918IDDB-A1#TRMPBF

LTC2918IDDB-A1#TRMPBF

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