LTC2904 データシートの表示（PDF） - Linear Technology

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LTC2904

Precision Dual Supply Monitors with Pin-Selectable Thresholds

Linear Technology 

LTC2904/LTC2905

TYPICAL PERFORMANCE CHARACTERISTICS

Specifications are at TA = 25°C unless otherwise noted.

IS1, IS2, ITOL vs Temperature

20

S1 = S2 = TOL = 3.3V

19

18

17

16

15

14

13

12

11

10

–50 –25 0 25 50 75 100

TEMPERATURE (oC)

29045 G25

IS1, IS2, ITOL vs Temperature

–20

S1 = S2 = TOL = GND

–19

–18

–17

–16

–15

–14

–13

–12

–11

–10

–50 –25 0 25 50 75 100

TEMPERATURE (oC)

29045 G26

PIN FUNCTIONS (TS8/DDB8)

V2 (Pin 1/Pin 4): Voltage Input 2. Input for V2 monitor.

Select from 3.3V, 2.5V, 1.8V, 1.5V, 1.2V or 1.0V. Refer to

Table 1 for details. The greater of V1, V2 is also the internal

supply voltage, VCC. Bypass this pin to ground with a 0.1μF

(or greater) capacitor.

RST (Pin 2/Pin 3): (LTC2904 Only) Reset Logic Output.

When all voltage inputs are above the reset threshold for

at least the programmed delay time, this pin pulls low. This

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

VCC using an external pull-up.

TMR (Pin 2/Pin 3): (LTC2905 Only) Reset Delay Time

Programming Pin. Attach an external capacitor (CTMR) to

GND to set a reset delay time of 9ms/nF. Leaving the pin

open generates a minimum delay of approximately 200μs. A

22nF capacitor will generate a 200ms reset delay time.

RST (Pin 3/Pin 2): Inverted Reset Logic Output. Pulls low

when any voltage input is below the reset threshold and is

held low for programmed delay time after all voltage inputs

are above threshold. This pin has a weak pull-up to VCC

and may be pulled above VCC using an external pull-up.

GND (Pin 4/Pin 1, Pin 9): Ground.

TOL (Pin 5/Pin 8): Three-state Input for Supply Tolerance

Selection (5%, 7.5% or 10%). See the Applications Infor-

mation section for tolerance selection chart (Table 2).

S1 (Pin 6/Pin 7): Voltage Threshold Select Three-State

Input. Connect to V1, GND or leave unconnected in open

state (See Table 1).

S2 (Pin 7/Pin 6): The Second Voltage Threshold Select

Three-State Input. Connect to V1, GND or leave uncon-

nected in open state (See Table 1).

V1 (Pin 8/Pin 5): Voltage Input 1. Input for V1 monitor.

Select from 5V, 3.3V, or 2.5V. See Table 1 for details.

The greater of V1, V2 is also the internal supply voltage,

VCC. Bypass this pin to ground with a 0.1μF (or greater)

capacitor.

29045fd

7

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