LTC1985ES5-1.8 Просмотр технического описания (PDF) - Linear Technology

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LTC1985ES5-1.8

Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package

Linear Technology 

LTC1985-1.8

TYPICAL PERFOR A CE CHARACTERISTICS

RST High Level Output Voltage vs

Output Source Current

3.5

VCC3 = VCC18 = VCCA = 3.0V

3.0

2.5

2.0

– 40°C

1.5

25°C

1.0

85°C

0.5

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4

ISOURCE (mA)

1985-81 G10

RST Voltage Output Low vs

Output Sink Current

1.8

VCC3 = VCC18 = 1.8V

1.6 VCCA = 0V

1.4

85°C

1.2

1.0

25°C

– 40°C

0.8

0.6

0.4

0.2

0

0 2 4 6 8 10 12 14

ISINK (mA)

1985-81 G11

RST Voltage Output Low vs

Output Sink Current

3.0

VCC3 = VCC18 = 3V

VCCA = 0V

2.5

85°C

25°C

2.0

– 40°C

1.5

1.0

0.5

0

0 5 10 15 20 25 30 35 40 45

ISINK (mA)

1985-81 G12

PI FU CTIO S

RST (Pin 1): Reset Logic Output. Active low, 3V push-

pull output. Asserted when one or all of the supplies are

below trip thresholds and held for 200ms after all sup-

plies become valid.

GND (Pin 2): Ground.

VCCA (Pin 3): 1V Sense, High Impedance Input. If unused

it can be tied to either VCC3 or VCC18.

VCC18 (Pin 4): 1.8V Sense Input and Power Supply Pin.

This pin is used on the LTC1985 to provide power to the

part when the voltage on VCC18 is greater than the voltage

on VCC3. Bypass to ground with a ≥ 0.1µF ceramic

capacitor.

VCC3 (Pin 5): 3V Sense Input and Power Supply Pin. This

pin provides power to the part when the voltage on VCC3

is greater than the voltage on VCC18. Bypass to ground

with a ≥ 0.1µF ceramic capacitor.

4

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