TC1305 datasheet(6/18 Pages) MICROCHIP

6 / 18 page

TC1305

DS21526A-page 6

4.4

Select Mode

™ Operation

The Select Mode™ operation is a tri-state input that

allows the user to select VOUT1 and VOUT2 from three

different values. By connecting the SELECT pin to

GND, both output voltages (VOUT1,VOUT2) supply

2.5V. Connecting the SELECT pin to VIN results in both

output channels supplying a fixed 3.0V output. Last but

not least, leaving the SELECT pin floating sets both

voltages to 2.8V. This output voltage functionality

provides high design flexibility and minimizes costs

associated with inventory, time-to-market and new

device qualifications.

4.5

RESET Output

The microprocessor supervisor of theTC1305 provides

accurate supply voltage monitoring and reset timing

during power-up, power-down and brown-out condi-

tions. The RESET output is valid to VDET = 1.0V (below

this point it becomes an open circuit and does not sink

current) and is able to reject negative going transients

(glitches) on the power supply line. Transient immunity

can further be improved by adding a capacitor close to

the VDET pin of the TC1305.

4.6

Turn On Response

The turn on response is defined as two separate

response categories, Wake Up Time (tWK) and Settling

Time (tS).

The TC1305 has a fast Wake Up Time (10

µsec typical)

when released from shutdown. See Figure 4-1 for the

Wake Up Time designated as tWK.The Wake Up Time

is defined as the time it takes for the output to rise to 2%

of the VOUT value after being released from shutdown.

The total turn on response is defined as the Settling

Time (tS), see Figure 4-1. Settling Time (inclusive with

tWK) is defined as the condition when the output is

within 2% of its fully enabled value (40

µsec typical)

when released from shutdown. The settling time of the

output voltage is dependent on load conditions and

output capacitance on VOUT (RC response).

FIGURE 4-1:

WAKE-UP RESPONSE

TIME

VIH

tWK

VOUT

98%

VIL

SHDN

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