LTC2900-2CDD datasheet(3/16 Pages) LINER

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LTC2900

2900f

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)

ELECTRICAL CHARACTERISTICS

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

a device may be impaired.

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: 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

TEST CIRCUITS

2900 F01

LTC2900-1

RST

ISOURCE

µA

2900 F02

LTC2900-1

RST

ISINK

2.5mA,

100

µA

2900 F03

LTC2900-2

RST

ISOURCE

200

µA

Figure 1. RST VOH Test

Figure 2. RST VOL Test

Figure 3. Active Pull-Up

RST VOH Test

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

current.

Note 5: The RST output pin on the LTC2900-1 has an internal pull-up to V2

of typically 6

µA. However, an external pull-up resistor 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 LTC2900-2 is

actively pulled up

to V2.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IV2

V2 Input Current

V2 = 3.3V

0.8

µA

IV3

V3 Input Current

V3 = 2.5V

0.52

1.2

µA

V3 = 0.55V (ADJ Mode)

–15

IV4

V4 Input Current

V4 = 1.8V

0.34

0.8

µA

V4 = 0.55V (ADJ Mode)

–15

V4 = –0.05V (–ADJ Mode)

–15

ICRT(UP)

CRT Pull-Up Current

VCRT = 0V

–1.4

–2

–2.6

µA

ICRT(DN)

CRT Pull-Down Current

VCRT = 1.3V

µA

tRST

Reset Time-Out Period

CRT = 1500pF

579

tUV

VX Undervoltage Detect to RST

VX Less Than Reset Threshold VRTX

150

µs

by More Than 1%

VOL

Output Voltage Low RST

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

0.15

0.4

V3, V4 = 0V; VPG = 0V

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

0.05

0.3

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

0.05

0.3

VOH

Output Voltage High RST (LTC2900-1)

ISOURCE = 1µA

V2 – 1

(Note 5)

Output Voltage High RST (LTC2900-2)

ISOURCE = 200µA

0.8 • V2

(Note 6)

Manual Reset Pin

VIH

PBR Input Threshold High

VCC = 3.3V to 5.5V

1.6

VIL

PBR Input Threshold Low

VCC = 3.3V to 5.5V

0.4

tPBW

PBR Input Pulse Width

VCC = 3.3V

150

tPBD

Manual Reset Propagation Delay

VCC = 3.3V, VPBR Falling

0.1

µs

IPBR

PBR Pull-Up Current

VPBR = 0V

–10

µA

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