Rev 1.26

Page 5 of 12

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Power-up

The SiT1532 starts-up to a valid output frequency within

300 ms (180 ms typ). To ensure the device starts-up within

the specified limit, make sure the power-supply ramps-up in

approximately 10

– 20 ms (to within 90% of Vdd). Start-up time

is measured from the time Vdd reaches 1.5V. For applications

that operate between 1.2V and 1.5V, the start-up time will be

typically 50 ms longer over temperature.

SiT1532 Nan

oDrive™

Figure 4 shows a typical output waveform of the SiT1532

(into a 10 pF load) when factory programmed for a 0.70V

Example:



NanoDrive™ part number coding: D14.

Example part number: SiT1532AI-J4-D14-32.768



Figure 4. SiT1532AI-J4-D14-32.768

Output Waveform (10 pF load)

Table 4

shows the supported NanoDrive™ V

programming options.

NanoDrive

Swing (mV)

Comments

D26

1.2

0.6

600 ±55

1.8V logic compatible

D14

1.1

0.4

700 ±55

1.8V logic compatible

D74

0.7

0.4

300 ±55

XTAL compatible

AA3

n/a

n/a

300 ±55

XTAL compatible

The values listed in Table 4 are nominal values at 25°C and

will exhibit a tolerance of ±55 mV across Vdd and -40°C to

85°C operating temperature range.

SiT1532 Full Swing LVCMOS Output

The SiT1532 can be factory programmed to generate

full-swing LVCMOS levels. Figure 5 shows the typical

waveform (Vdd = 1.8V) at room temperature into a

15 pF load.

Example:



LVCMOS output part number coding is always

DCC



Example part number: SiT1532AI-J4-DCC-32.768

Figure 5. LVCMOS Waveform

(Vdd = 1.8V) into 15 pF Load