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Smallest Footprint (1.2mm

) CSP,

10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement

The Smart Timing Choice

SiT1532

Features



Applications



Smallest footprint in chip-scale (CSP): 1.5 x 0.8 mm

Fixed 32.768 kHz

<10 ppm frequency tolerance

Ultra-low power: <1 µA

Directly interfaces to XTAL inputs

Supports coin-cell or super-cap battery backup voltages

Vdd supply range: 1.5V to 3.63V over -40°C to +85°C

Oscillator output eliminates external load caps

Internal filtering eliminates external Vdd bypass cap

NanoDrive™ programmable output swing for lowest power

Pb-free, RoHS and REACH compliant

Mobile Phones

Tablets

Health and Wellness Monitors

Fitness Watches

Sport Video Cams

Wireless Keypads

Ultra-Small Notebook PC

Pulse-per-Second (pps) Timekeeping

RTC Reference Clock

Battery Management Timekeeping

Electrical Characteristics

Parameter

Fixed Output Frequency

Symbol

Fout

Min.

Typ.

32.768

Frequency Tolerance

[1]

Max.

Unit

kHz

Condition

Frequency and Stability

Frequency Stability

ppm

= 25°C, post reflow, Vdd: 1.5V – 3.63V.

= 25°C, post reflow with board-level underfill,

Vdd: 1.5V – 3.63V.

= -10°C to +70°C, Vdd: 1.5V – 3.63V.

ppm

μA

μA/Vpp

= -40°C to +85°C, Vdd: 1.5V – 3.63V.

= -10°C to +70°C, Vdd: 1.2V – 1.5V.

1st Year

= -10°C to +70°C

= -40°C to +85°C

= 25°C, Vdd: 1.8V. No load

1.3

1.4

Output Stage Operating Current

[3]

Power-Supply Ramp

Start-up Time at Power-up

[4]

Idd_out

t_Vdd_

Ramp

t_start

180

0.065

0.125

100

300

450

-10

-40

= -10°C to +70°C, Vdd max: 3.63V. No load

= -40°C to +85°C, Vdd max: 3.63V. No load

= -40°C to +85°C, Vdd: 1.5V – 3.63V. No load

Vdd Ramp-up from 0 to 90%, T

= -40°C to +85°C

= -40°C ≤ T

≤ +50°C, valid output

= +50°C < T

≤ +85°C, valid output

F_tol

Frequency Stability

25°C Aging

[2]

F_stab

-1

1.2

1.5

0.90

100

250

3.63

Supply Voltage and Current Consumption

Operating Supply Voltage

Vdd

Core Operating Current

[3]

Idd

Operating Temperature Range

Commercial Temperature

Industrial Temperature

T_use

°C

Notes:

1. Measured peak-to-peak. Tested with Agilent 53132A frequency counter. Due to the low operating frequency, the gate time must be ≥100 ms to ensure an accurate

frequency measurement.

2. Measured peak-to-peak. Inclusive of Initial Tolerance at 25°C, and variations over operating temperature, rated power supply voltage and load. Stability is

specified for two operating voltage ranges. Stability progressively degrades with supply voltage below 1.5V.

3. Core operating current does not include output driver operating current or load current. To derive total operating current (no load), add core operating current +

(0.065 µA/V) * (output voltage swing).

4. Measured from the time Vdd reaches 1.5V.

SiTime Corporation

Rev 1.2

990 Almanor Avenue, Sunnyvale, CA 94085

(408) 328-4400

www.sitime.com

Revised November 10, 2014

SiT1532

Smallest Footprint (1.2mm

) CSP,

10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement

The Smart Timing Choice

Electrical Characteristics

(continued)

Parameter

Symbol

Min.

Typ.

100

Max.

200

90%

10%

Unit

Condition

LVCMOS Output Option, T

= -40°C to +85°C, typical values are at T

= 25°C

Output Rise/Fall Time

Output Clock Duty Cycle

Output Voltage High

Output Voltage Low

tr, tf

VOH

VOL

Vdd: 1.5V – 3.63V. I

= -10 μA, 15 pF

Vdd: 1.5V – 3.63V. I

= 10 μA, 15 pF

10-90% (Vdd), 15 pF load, Vdd = 1.5V to 3.63V

10-90% (Vdd), 5 pF load, Vdd ≥ 1.62V

NanoDrive™ Programmable, Reduced Swing Output

Output Rise/Fall Time

Output Clock Duty Cycle

AC-coupled Programmable

Output Swing

DC-Biased Programmable

Output Voltage High Range

DC-Biased Programmable

Output Voltage Low Range

Programmable Output Voltage

Swing Tolerance

Period Jitter

T_jitt

tf, tf

V_sw

0.20 to

0.80

0.60 to

1.225

0.35 to

0.80

-0.055

0.055

Jitter

RMS

Cycles = 10,000, T

= 25°C, Vdd = 1.5V – 3.63V

200

SiT1532 does not internally AC-couple. This output description

is intended for a receiver that is AC-coupled. See Table 2 for

acceptable NanoDrive swing options.

Vdd: 1.5V – 3.63V, 10 pF Load, I

/ I

= ±0.2 μA.

Vdd: 1.5V – 3.63V. I

= -0.2 μA, 10 pF Load. See Table 1 for

acceptable V

setting levels.

Vdd: 1.5V – 3.63V. I

= 0.2 μA, 10 pF Load. See Table 1 for

acceptable V

setting levels.

= -40°C to +85°C, Vdd = 1.5V to 3.63V.

30-70% (V

), 10 pF Load

VOH

VOL

Pin Configuration

1, 4

Symbol

GND

I/O

Power Supply

Ground

Functionality

Connect to ground. Acceptable to connect pin 1 and 4 together. Both pins

must be connected to GND.

Oscillator clock output. The CLK can drive into a Ref CLK input or into an

ASIC or chip-set’s 32kHz XTAL input. When driving into an ASIC or

chip-set oscillator input (X IN and X Out), the CLK Out is typically

connected directly to the XTAL IN pin. No need for load

capacitors. The output driver is intended to be insensitive to capacitive

CSP Package (Top View)

CLK Out

OUT

GND

Vdd

Connect to power supply 1.2V ≤ Vdd ≤ 3.63V. Under normal operating

conditions, Vdd does not require external bypass/decoupling

capacitor(s). For more information about the internal power-supply

Power Supply filtering, see the

Power Supply Noise Immunity

section in the detailed

description.

Contact factory for applications that require a wider operating supply

voltage range.

CLK Out

Vdd

Rev. 1.2

Page 2 of 12

www.sitime.com

SiT1532

Smallest Footprint (1.2mm

) CSP,

10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement

The Smart Timing Choice

System Block Diagram

MEMS Resonator

GND

Control

Regulators

Vdd

Trim

Prog

GND

Sustaining

Amp

Ultra-Low

Power

PLL

Divider

Ultra-Low

Power Driver

CLK Out

Figure 1.

Absolute Maximum

Attempted operation outside the absolute maximum ratings may cause permanent damage to the part. Actual performance of

the IC is only guaranteed within the operational specifications, not at absolute maximum ratings.

Parameter

Continuous Power Supply Voltage Range (Vdd)

Short Duration Maximum Power Supply Voltage (Vdd)

Continuous Maximum Operating Temperature Range

Short Duration Maximum Operating Temperature Range

Human Body Model ESD Protection

Charge-Device Model (CDM) ESD Protection

Machine Model (MM) ESD Protection

Latch-up Tolerance

Mechanical Shock Resistance

Mechanical Vibration Resistance

1508 CSP Junction Temperature

Mil 883, Method 2002

Mil 883, Method 2007

<30 minutes

Vdd = 1.5V - 3.63V

Vdd = 1.5V - 3.63V, ≤30 mins

HBM, JESD22-A114

JESD220C101

= 25°C

JESD78 Compliant

10,000

150

°C

Test Condition

Value

-0.5 to 3.63

4.0

105

125

3000

750

300

Unit

°C

Rev. 1.2

Page 3 of 12

www.sitime.com

SiT1532

Smallest Footprint (1.2mm

) CSP,

10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement

The Smart Timing Choice

Description

The SiT1532 is the world’s smallest, lowest power 32 kHz

oscillator optimized for mobile and other battery-powered

applications. SiTime’s silicon MEMS technology enables the

smallest footprint and chip-scale packaging. This device

reduces the 32 kHz footprint by as much as 85% compared to

existing 2.0 x 1.2 mm SMD XTAL packages. Unlike XTALs, the

SiT1532 oscillator output enables greater component

placement flexibility and eliminates external load capacitors,

thus saving additional component count and board space. And

unlike standard oscillators, the SiT1532 features

NanoDrive™, a factory programmable output that reduces the

voltage swing to minimize power.

The 1.2V to 3.63V operating supply voltage range makes it an

ideal solution for mobile applications that incorporate a

low-voltage, battery-back-up source such as a coin-cell or

super-cap.

SiTime’s MEMS oscillators consist of MEMS resonators and a

programmable analog circuit. Our MEMS resonators are built

with SiTime’s unique MEMS First™ process. A key manufac-

turing step is EpiSeal™ during which the MEMS resonator is

annealed with temperatures over 1000°C. EpiSeal creates an

extremely strong, clean, vacuum chamber that encapsulates

the MEMS resonator and ensures the best performance and

reliability. During EpiSeal, a poly silicon cap is grown on top of

the resonator cavity, which eliminates the need for additional

cap wafers or other exotic packaging. As a result, SiTime’s

MEMS resonator die can be used like any other semicon-

ductor die. One unique result of SiTime’s MEMS First and

EpiSeal manufacturing processes is the capability to integrate

SiTime’s MEMS die with a SOC, ASIC, microprocessor or

analog die within a package to eliminate external timing

components and provide a highly integrated, smaller, cheaper

solution to the customer.

Contact SiTime for applications that require a wider supply

voltage range >3.63V or lower frequency options as low as

1Hz.

Frequency Stability (ppm)

SiT153x Industrial Temp Specification

SiT1532 10ppm

Max @ 25 C

SiT1532 Measured

Quartz XTAL

-160 to -220 ppm Over Temp

Temperature (°C)

Figure 2. SiTime vs. Quartz

Power Supply Noise Immunity

In addition to eliminating external output load capacitors

common with standard XTALs, The SiT1532 includes special

internal power supply filtering and thus, eliminates the need

for an external Vdd bypass-decoupling capacitor. This feature

further simplifies the design and keeps the footprint as small

as possible. Internal power supply filtering is designed to

reject greater than ±150 mVpp magnitude and frequency

components through 10 MHz.

Output Voltage

The SiT1532 has two output voltage options. One option is a

standard LVCMOS output swing. The second option is the

NanoDrive reduced swing output. Output swing is customer

specific and programmed between 200 mV and 800 mV. For

DC-coupled applications, output V

and V

are individually

factory programmed to the customers’ requirement. V

programming range is between 600 mV and 1.225V in 100 mV

increments. Similarly, V

programming range is between 350

mV and 800 mV. For example; a PMIC or MCU is internally

1.8V logic compatible, and requires a 1.2V V

and a 0.6V V

Simply select SiT1532 NanoDrive factory programming code

to be “D14” and the correct output thresholds will match the

downstream PMIC or MCU input requirements. Interface logic

will vary by manufacturer and we recommend that you review

the input voltage requirements for the input interface.

For DC-biased NanoDrive output configuration, the minimum

is limited to 350mV and the maximum allowable swing

- V

) is 750 mV. For example, 1.1V V

and 400 mV

is acceptable, but 1.2V V

and 400 mV V

is not

acceptable.

When the output is interfacing to an XTAL input that is inter-

nally AC-coupled, the SiT1532 output can be factory

programmed to match the input swing requirements. For

example, if a PMIC or MCU input is internally AC-coupled and

requires an 800 mV swing, then simply choose the SiT1532

NanoDrive programming code “AA8” in the part number. It is

important to note that the SiT1532 does not include internal

AC-coupling capacitors. Please see the

Part Number Ordering

section at the end of the datasheet for more information about

the part number ordering scheme.

www.sitime.com

Frequency Stability

The SiT1532 is factory calibrated (trimmed) to guarantee

frequency stability to be less than 10 ppm at room temperature

and less than 100 ppm over the full -40°C to +85°C temper-

ature range. Unlike quartz crystals that have a classic tuning

fork parabola temperature curve with a 25°C turnover point,

the SiT1532 temperature coefficient is extremely flat across

temperature. The device maintains less than 100 ppm

frequency stability over the full operating temperature range

when the operating voltage is between 1.5 and 3.63V as

shown in Figure 2.

Functionality is guaranteed over the 1.2V - 3.63V operating

supply voltage range. However, frequency stability degrades

below 1.5V and steadily degrades as it approaches the 1.2V

minimum supply due to the internal regulator limitations.

Between 1.2V and 1.5V, the frequency stability is 250 ppm

max over temperature.

When measuring the SiT1532 output frequency with a

frequency counter, it is important to make sure the counter's

gate time is >100ms. The slow frequency of a 32kHz clock will

give false readings with faster gate times.

Rev. 1.2

Page 4 of 12

SiT1532

Smallest Footprint (1.2mm

) CSP,

10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement

The Smart Timing Choice

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.

Table 2 shows the supported AC coupled Swing levels. The

“AC-coupled” terminology refers to the programming

description for applications where the downstream chipset

includes an internal AC-coupling capacitor, and therefore,

only the output swing is important and V

is not relevant.

For these applications, refer to Table 2 for the acceptable

voltage swing options.

Table 2. Acceptable AC-Coupled Swing Levels

Swing

Output

Code

0.800

AA8

0.700

AA7

0.600

AA6

0.500

AA5

0.400

AA4

0.300

AA3

0.250

AA2

0.200

AA1

SiT1532 NanoDrive™

Figure 3 shows a typical output waveform of the SiT1532 (into

a 10 pF load) when factory programmed for a 0.70V swing and

DC bias (V

) for 1.8V logic:

Example:

• NanoDrive™ part number coding: D14. Example part

number: SiT1532AI-J4-D14-32.768

• V

= 1.1V, V

= 0.4V (V_

= 0.70V)

Example:

• NanoDrive part number coding: AA2. Example part num-

ber: SiT1532AI-J4-AA2-32.768

• Output voltage swing: 0.250V

The values listed in Tables 1 and -2 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.

= 1.1V

SiT1532 Full Swing LVCMOS Output

= 0.7V

The SiT1532 can be factory programmed to generate

full-swing LVCMOS levels. Figure 4 shows the typical

waveform (Vdd = 1.8V) at room temperature into a 15 pF load.

= 0.4V

Figure 3. SiT1532AI-J4-D14-32.768

Output Waveform (10 pF load)

Table 1 shows the supported NanoDrive™ V

, V

factory

programming options.

Table 1. Acceptable V

NanoDrive™ Levels

0.800

0.700

0.525

0.500

0.400

0.350

1.225

D28

D27

D26

D25

1.100

D18

D17

D16

D15

D14

D13

1.000

D08

D07

D06

D05

D04

D03

D97

D96

D95

D94

D93

D86

D85

D84

D83

D75

D74

D73

D64

D63

0.900

0.800

0.700

0.600

Figure 4. LVCMOS Waveform

(Vdd = 1.8V) into 15 pF Load

Example:

• LVCMOS output part number coding is always

DCC

• Example part number: SiT1532AI-J4-DCC-32.768

Rev. 1.2

Page 5 of 12

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