LTC2913CDD-2(RevA) データシートの表示（PDF） - Linear Technology

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LTC2913CDD-2
(Rev.:RevA)

Dual UV/OV Voltage Monitor

Linear Technology 

LTC2913

PIN FUNCTIONS

TMR (Pin 9): Reset Delay Timer. Attach an external capaci-

tor (CTMR) of at least 10pF to GND to set a reset delay time

of 9ms/nF. A 1nF capacitor will generate an 8.5ms reset

delay time. Tie TMR to VCC to bypass timer.

UV (Pin 7): Undervoltage Logic Output. Asserts low when

either VH input voltage is below threshold. Held low for a

programmed delay time after both VH inputs are valid. UV

has a weak pull-up to VCC and may be pulled above VCC

using an external pull-up. Leave UV open if unused.

VCC (Pin 10): Supply Voltage. Bypass this pin to GND with

a 0.1µF (or greater) capacitor. Operates as a direct supply

input for voltages up to 6V. Operates as a shunt regulator for

supply voltages greater than 6V and must have a resistance

between the pin and the supply to limit input current to no

greater than 10mA. When used without a current-limiting

resistance, VCC voltage must not exceed 6V.

VH1/VH2 (Pin 1/Pin 3): Voltage High Inputs 1 and 2. When

the voltage on this pin is below 0.5V, an undervoltage

condition is triggered. Tie pin to VCC if unused.

VL1/VL2 (Pin 2/Pin 4): Voltage Low Inputs 1 and 2. When

the voltage on this pin is above 0.5V, an overvoltage condi-

tion is triggered. Tie pin to GND if unused.

BLOCK DIAGRAM

VH1 –

1

+

–

VL1

+

2

VH2 –

3

+

–

VL2

+

4

0.5V

GND

5

6

10

VCC

UVLO

2V

VCC

UVLO

9

TMR

OSCILLATOR

UV PULSE

GENERATOR

DISABLE

OV PULSE

GENERATOR

DISABLE

VCC

400k

UV

7

VCC

400k

OV

6

LTC2913-1

LTC2913-2

OV LATCH

CLEAR/BYPASS

LATCH

8

1V

1V

DIS

8

2µA

2913 BD

2913fa

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