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LTC2902

Programmable Quad Supply Monitor with Adjustable Reset Timer and Supply Tolerance

Linear Technology 

LTC2902

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

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

SYMBOL PARAMETER

CONDITIONS

MIN

TYP MAX

UNITS

VRTAN

– ADJ Reset Threshold

V4 Input Threshold

q

– 18

0

18

mV

VCC

Minimum Internal Operating Voltage

RST, COMPX in Correct Logic State;

q

VCC Rising Prior to Program

1

V

VCCMINP Minimum Required for Programming

VCC Rising

q

2.42

V

VCCMINC Minimum Required for Comparators

VCC Falling

q

2.32

V

VREF

Reference Voltage

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

T0 Low, T1 Low

q 1.192 1.210 1.228

V

T0 Low, T1 High

q 1.160 1.178 1.195

V

T0 High, T1 Low

q 1.128 1.146 1.163

V

T0 High, T1 High

q 1.096 1.113 1.130

V

VPG

Programming Voltage Range

IVPG

VPG Input Current

IV1

V1 Input Current

IV2

V2 Input Current

IV3

V3 Input Current

VCC ≥ VCCMINP

VPG = VREF

V1 = 5V, IVREF = 12µA, (Note 4)

V2 = 3.3V

V3 = 2.5V

V3 = 0.55V (ADJ Mode)

q

0

q

VREF

V

±20

nA

q

43

75

µA

q

0.8

2

µA

q

0.52

1.2

µA

–15

15

nA

IV4

V4 Input Current

V4 = 1.8V

V4 = 0.55V (ADJ Mode)

V4 = –0.05V (–ADJ Mode)

q

0.34

0.8

µA

q

–15

15

nA

q

–15

15

nA

ICRT(UP)

CRT Pull-Up Current

VCRT = 0V

q

– 1.4

–2

– 2.6

µA

ICRT(DN)

CRT Pull-Down Current

VCRT = 1.3V

q

10

20

30

µA

tRST

Reset Time-Out Period

CRT = 1500pF

q

5

7

9

ms

tUV

VX Undervoltage Detect to RST or COMPX VX Less Than Reset Threshold VRTX

by More Than 1%

150

µs

VOL

Output Voltage Low RST, COMPX

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

q

V3, V4 = 0V; VPG = 0V

0.15

0.4

V

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

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

0.05

0.3

V

0.05

0.3

V

VOH

Output Voltage High RST, COMPX (Note 5) ISOURCE = 1µA

q V2 – 1

V

VOH

Output Voltage High RST (LTC2902-2)

ISOURCE = 200µA

q 0.8 • V2

V

(Note 6)

Digital Inputs T0, T1, RDIS

VIL

VIH

IINTOL

VIL

VIH

IRDIS

T0, T1 Low Level Input Voltage

T0, T1 High Level Input Voltage

T0, T1 Input Current

RDIS Input Threshold Low

RDIS Input Threshold High

RDIS Pull-Up Current

VCC = 3.3V to 5.5V

VCC = 3.3V to 5.5V

T0 = 0V, T1 = VCC

VCC = 3.3V to 5.5V

VCC = 3.3V to 5.5V

VRDIS = 0V

q

0.3VCC

V

q 0.7VCC

V

q

±0.1

±1

µA

q

0.4

V

q

1.6

V

– 10

µA

Note 1: Absolute Maximum Ratings are those values beyond which the life of

a device may be impaired.

Note 2: All voltage values are with respect to GND.

Note 3: The greater of V1, V2 is the internal supply voltage (VCC).

Note 4: 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 5: The output pins RST 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 6: The push-pull RST output pin on the LTC2902-2 is actively pulled up

to V2.

2902f

3

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