LTC2935 データシートの表示（PDF） - Linear Technology

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LTC2935

Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds

Linear Technology 

LTC2935

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

Supply Current vs S0, S1, S2

Input Voltage

250

VCC = 3.6V

200

Supply Current vs MR Input Voltage

5

VCC = 3.6V

4

150

3

100

2

50

1

0

0 0.5 1 1.5 2 2.5 3 3.5 4

S0, S1, S2 INPUT VOLTAGE (V)

2935 G07

0

0 0.5 1 1.5 2 2.5 3 3.5 4

MR INPUT VOLTAGE (V)

2935 G08

PIN FUNCTIONS

Exposed Pad (DFN Only): Exposed Pad may be left floating

or connected to device ground.

GND: Device ground.

MR: Manual Reset Input. Attach a pushbutton switch

between this input and ground. A logic low on this input

pulls RST low. When the MR input returns to logic high,

RST returns high after 200ms. Tie to VCC if unused.

PFO: Power-Fail Output. PFO pulls low when VCC falls

below the power-fail threshold. The power-fail thresh-

old is above the configured falling reset threshold by a

pre-determined margin. PFO is released when VCC rises

above the power-fail threshold by 2.5%. PFO is available

with open-drain (LTC2935-1/LTC2935-3) or active pull-up

(LTC2935-2/LTC2935-4) outputs. Leave open if unused.

RST: Reset Output. RST pulls low when VCC falls below the

reset threshold. RST is released 200ms after VCC exceeds

the reset threshold plus 5% hysteresis. RST is available

with open-drain (LTC2935-1/LTC2935-3) or active pull-up

(LTC2935-2/LTC2935-4) outputs. Leave open if unused.

S2, S1, S0: Threshold Selection Inputs. Tie to GND or

VCC for required reset threshold. See the Falling Threshold

Selection Table on page 1 for settings.

VCC: Power Supply and Monitored Voltage Input. Bypass

VCC with a 0.1μF capacitor to GND.

2935fa

5

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