LTC2906CTS8 datasheet(6/16 Pages) LINER

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LTC2906/LTC2907

29067f

PI FU CTIO S

VCC (Pin 1/Pin 4): Optional Power Supply Pin. VCC powers

and maintains the correct operation of the RST and RST

pins in the complete absence of V1. If V1 is present, the

greater of VCC or V1 (VMAX) powers the internal circuitry

and the reset outputs. Bypass this pin to ground with a

0.1

µF (or greater) capacitor. Tie to V1 when no optional

power is available.

RST (Pin 2/Pin 3): (LTC2906 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 VMAX and may be pulled above

VMAX using an external pull-up.

TMR (Pin 2/Pin 3): (LTC2907 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 200

µs.

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

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

when either V1 or VADJ is below the reset threshold and

holds low for programmed delay time after all voltage

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

VMAX and may be pulled above VMAX using an external

pull-up.

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

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

Selection (5%, 7.5% or 10%). Refer to Applications Infor-

mation for tolerance selection chart (Table 3).

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

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

open state to select one of three possible input threshold

levels (refer to Table 1).

VADJ (Pin 7/Pin 6): Adjustable Voltage Input. Bypass this

pin to ground with a 0.1

µF (or greater) capacitor in a noisy

environment.

V1 (Pin 8/Pin 1): Voltage Input 1. Select from 5V, 3.3V or

2.5V. Refer to Table 1 for details. The greater of (V1, VCC)

is also the internal VCC (VMAX). Bypass this pin to ground

with a 0.1

µF (or greater) capacitor.

(TS8 Package/DDB8 Package)

TYPICAL PERFOR A CE CHARACTERISTICS

TEMPERATURE (

°C)

–20

–19

–18

–17

–16

–15

–14

–13

–12

–11

–10

29067 G22

–50

100

–25

S1 = TOL = GND

V1 = 3.3V

IS1, ITOL vs Temperature

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

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