LTC2906/LTC2907

6

29067f

PI FU CTIO S

and maintains the correct operation of the RST and RST

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

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

TMR (Pin 2/Pin 3): (LTC2907 Only) Reset Delay Time

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

holds low for programmed delay time after all voltage

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

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).

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

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

75

–25

0

50

S1 = TOL = GND

V1 = 3.3V