TPS65921 datasheet(7/58 Pages) TI1

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HFCLKOUT

CHO1

CHO2

SWCS048-002

Tstartup

Delay1

Delay2

XIN

Starting_Event

CLK32KOUTEN

CLK32KOUT

CLKEN

HFCLKOUTEN

HFCLKOUT

NRESPWRON

SWCS048-003

HFCLKIN

HFCLKOUT

SWCS048-004

TPS65921

www.ti.com

SWCS048F – MARCH 2010 – REVISED MARCH 2012

Table 3. HFCLKOUT Output Clock Switching Characteristics (continued)

NAME

PARAMETER

DESCRIPTION

MIN

TYP

MAX

UNIT

Fall time, HFCLKOUT, low

drive(1)

- Load: 5 pF

3.5

- Load: 10 pF

5.1

CHO4

tF(HFCLKOUT)

Fall time, HFCLKOUT, high

drive(1)

- Load: 10 pF

2.7

- Load: 20 pF

4.7

Figure 2 shows the HFCLKOUT output clock waveform.

Figure 2. HFCLKOUT Output Clock

Figure 3 shows the 32KCLKOUT and HFCLKOUT clock stabilization time.

Tstartup, Delay1, Delay2, and Delay3 depend on the boot mode (See Power timing chapter).

Figure 3. 32KCLKOUT and HFCLKOUT Clock Stabilization Time

Figure 4. HFCLKOUT Behavior

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