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LTC2901-2IGN

Programmable Quad Supply Monitor with Adjustable Reset and Watchdog Timers

Linear Technology 

LTC2901

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, unless otherwise noted. (Notes 3, 4)

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX

VCCMINP

VCCMINC

VREF

Minimum Required for Programming

Minimum Required for Comparators

Reference Voltage

VPG

Programming Voltage Range

IVPG

VPG Input Current

IV1

V1 Input Current

IV2

V2 Input Current

IV3

V3 Input Current

VCC Rising

●

VCC Falling

●

VCC ≥ 2.3V, IVREF = ±1mA, CREF ≤ 1000pF

T0L Low

●

T0L High

●

VCC ≥ VCCMINP

●

VPG = VREF

●

V1 = 5V, IVREF = 12µA, (Note 5)

●

V2 = 3.3V

●

V3 = 2.5V

●

V3 = 0.55V (ADJ Mode)

●

2.42

2.32

1.192

1.128

0

–15

1.210

1.146

43

0.8

0.52

1.228

1.163

VREF

±20

75

2

1.2

15

IV4

V4 Input Current

V4 = 1.8V

V4 = 0.55V (ADJ Mode)

V4 = –0.05V (–ADJ Mode)

●

0.34

0.8

●

–15

15

●

–15

15

ICRT(UP)

ICRT(DN)

tRST

tUV

CRT Pull-Up Current

CRT Pull-Down Current

Reset Time-Out Period

VX Undervoltage Detect to RST or COMPX

VCRT = 0V

VCRT = 1.3V

CRT = 1500pF

VX Less Than Reset Threshold VRTX

by More Than 1%

●

– 1.4

–2

– 2.6

●

10

20

30

●

5

7

9

150

VOL

Output Voltage Low RST, COMPX

ISINK = 2.5mA; V1 = 3V, V2 = 3V;

●

V3, V4 = 0V; VPG = 0V

0.15

0.4

ISINK = 100µA; V2 = 1V; V1, V3, V4 = 0V ●

ISINK = 100µA; V1 = 1V; V2, V3, V4 = 0V ●

0.05

0.3

0.05

0.3

VOH

Output Voltage High RST, WDO, COMPX ISOURCE = 1µA

(Note 6)

● V2 – 1

VOL

Output Voltage Low WDO

VOH

Output Voltage High RST

(LTC2901-2/LTC2901-4) (Note 7)

ISINK = 2.5mA; V1 = 5V, V2 = 3.3V;

V3, V4 = 1V; VPG = 0V

ISOURCE = 200µA

●

0.15

0.4

● 0.8 • V2

ICWT(UP) CWT Pull-Up Current

ICWT(DN) CWT Pull-Down Current

tWD

Watchdog Time-Out Period

VIH

WDI Input Threshold High

VIL

WDI Input Threshold Low

tWP

WDI Input Pulse Width

IWDI

WDI Pull-Up Current

Digital Input T0L

VCWT = 0V

VCWT = 1.3V

CWT = 1500pF

VCC = 3.3V to 5.5V

VCC = 3.3V to 5.5V

VCC = 3.3V

VWDI = 0V

●

– 1.4

–2

– 2.6

●

10

20

30

●

20

30

40

●

1.6

●

0.4

●

150

– 10

VIL

VIH

IINTOL

T0L Low Level Input Voltage

T0L High Level Input Voltage

T0L Input Current

VCC = 3.3V to 5.5V

VCC = 3.3V to 5.5V

TOL = VCC

●

0.3VCC

● 0.7VCC

●

±0.1

±1

UNITS

V

V

V

V

V

nA

µA

µA

µA

nA

µA

nA

nA

µA

µA

ms

µs

V

V

V

V

V

V

µA

µA

ms

V

V

ns

µA

V

V

µA

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: The greater of V1, V2 is the internal supply voltage (VCC).

Note 4: 10% thresholds apply to the LTC2901-3/LTC2901-4 only when the

TOL pin is set to a logic high.

Note 5: Under static no-fault conditions, V1 will necessarily supply quiescent

current. If at any time V2 is larger than V1, V2 must be capable of supplying

the quiescent current, programming (transient) current and reference load

current.

Note 6: The output pins RST, WDO and COMPX have internal pull-ups to V2

of typically 6µA. However, external pull-up resistors may be used when faster

rise times are required or for VOH voltages greater than V2.

Note 7: The push-pull RST output pin on the LTC2901-2/LTC2901-4 is

actively pulled up to V2.

2901fb

3

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