SiT1532 Smallest Footprint (1.2mm2) CSP
10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
Features
◼ 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: 1.5 V to 3.63 V 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
Applications
◼ 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 Specifications
Table 1. Electrical Characteristics
Parameter
Symbol
Min.
Typ.
Unit
Condition
Frequency and Stability
Fixed Output Frequency
Fout
32.768
kHz
Frequency Stability
Frequency Tolerance[1]
F_tol
ppm
TA = 25°C, post reflow, Vdd: 1.5 V – 3.63 V
ppm
TA = 25°C, post reflow with board-level underfill,
Vdd: 1.5 V – 3.63 V
Frequency Stability[2]
F_stab
ppm
TA = -10°C to +70°C, Vdd: 1.5 V – 3.63 V
TA = -40°C to +85°C, Vdd: 1.5 V – 3.63 V
TA = -10°C to +70°C, Vdd: 1.2 V – 1.5 V
25°C Aging
-1
ppm
1st Year
Supply Voltage and Current Consumption
Operating Supply Voltage
Vdd
1.2
V
TA = -10°C to +70°C
1.5
V
TA = -40°C to +85°C
Core Operating Current[3]
Idd
0.90
μA
TA = 25°C, Vdd: 1.8 V. No load
TA = -10°C to +70°C, Vdd max: 3.63 V. No load
TA = -40°C to +85°C, Vdd max: 3.63 V. No load
Output Stage Operating Current[3]
Idd_out
0.065
μA/Vpp
TA = -40°C to +85°C, Vdd: 1.5 V – 3.63 V. No load
Power-Supply Ramp
t_Vdd
Ramp
ms
Vdd Ramp-up from 0 to 90%, TA = -40°C to +85°C
Start-up Time at Power-up[4]
t_start
180
ms
TA = -40°C ≤ TA ≤ +50°C, valid output
TA = +50°C < TA ≤ +85°C, valid output
Operating Temperature Range
Commercial Temperature
T_use
-10
°C
Industrial Temperature
-40
°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 1.5 V.
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 1.5 V.
Rev 1.28
November 23, 2020
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SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
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Table 1. Electrical Characteristics (continued)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
LVCMOS Output Option, TA = -40°C to +85°C, typical values are at TA = 25°C
Output Rise/Fall Time
tr, tf
100
200
ns
10-90% (Vdd), 15 pF load, Vdd = 1.5 V to 3.63 V
50
10-90% (Vdd), 5 pF load, Vdd ≥ 1.62 V
Output Clock Duty Cycle
DC
48
52
%
Output Voltage High
VOH
90%
V
Vdd: 1.5V – 3.63V. IOH = -10 μA, 15 pF
Output Voltage Low
VOL
10%
V
Vdd: 1.5V – 3.63V. IOL = 10 μA, 15 pF
NanoDrive™ Programmable, Reduced Swing Output
Output Rise/Fall Time
tf, tf
200
ns
30-70% (VOL/VOH), 10 pF Load
Output Clock Duty Cycle
DC
48
52
%
AC-coupled Programmable Output
Swing
V_sw
0.20 to
0.80
V
SiT1532 does not internally AC-couple. This output description
is intended for a receiver that is AC-coupled. See Table 5 for
acceptable NanoDrive swing options.
Vdd: 1.5 V – 3.63 V, 10 pF Load, IOH / IOL = ±0.2 μA.
DC-Biased Programmable Output
Voltage High Range
VOH
0.60 to
1.225
V
Vdd: 1.5 V – 3.63 V. IOH = -0.2 μA, 10 pF Load. See Table 4
for acceptable VOH/VOL setting levels.
DC-Biased Programmable Output
Voltage Low Range
VOL
0.35 to
0.80
V
Vdd: 1.5 V – 3.63 V. IOL = 0.2 μA, 10 pF Load. See Table 4
for acceptable VOH/VOL setting levels.
Programmable Output Voltage
Swing Tolerance
-0.055
0.055
V
TA = -40°C to +85°C, Vdd = 1.5 V to 3.63 V.
Jitter
Period Jitter
T_jitt
35
nsRMS
Cycles = 10,000, TA = 25°C, Vdd = 1.5 V – 3.63 V
Table 2. Pin Configuration
CSP Package (Top View)
GND
Vdd
CLK Out
GND 14
23
Figure 1. Pin Assignments
Pin
Symbol
I/O
Functionality
1, 4
GND
Power Supply
Ground
Connect to ground. Acceptable to connect pin 1 and 4 together.
Both pins must be connected to GND.
2
CLK Out
OUT
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 loading.
3
Vdd
Power
Supply
Connect to power supply 1.2 V ≤ Vdd ≤ 3.63 V. Under normal
operating conditions, Vdd does not require external
bypass/decoupling capacitor(s).
For more information about the internal 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.
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
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System Block Diagram
Ultra-low
Power
PLL
Sustaining
Amp
Regulators
Ultra-low
Power
Driver
Vdd
GND CLK OutDivider
GND
MEMS Resonator
Prog
Control
Trim Prog
Figure 2. SiT1532 Block Diagram
Table 3. Absolute Maximum Limits
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
Test Condition
Value
Unit
Continuous Power Supply Voltage Range (Vdd)
-0.5 to 3.63
V
Short Duration Maximum Power Supply Voltage (Vdd)
<30 minutes
4.0
V
Continuous Maximum Operating Temperature Range
Vdd = 1.5 V - 3.63 V
105
°C
Short Duration Maximum Operating Temperature Range
Vdd = 1.5 V - 3.63 V, ≤30 mins
125
°C
Human Body Model ESD Protection
JESD22-A114
3000
V
Charge-Device Model (CDM) ESD Protection
JESD22-C101
750
V
Machine Model (MM) ESD Protection
JESD22-A115
300
V
Latch-up Tolerance
JESD78 Compliant
Mechanical Shock Resistance
Mil 883, Method 2002
10,000
g
Mechanical Vibration Resistance
Mil 883, Method 2007
70
g
1508 CSP Junction Temperature
150
°C
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
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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 1.2 V to 3.63 V 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
manufacturing 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 semiconductor
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.
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 temperature 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
3.63 V as shown in Figure 3.
Functionality is guaranteed over the 1.2 V – 3.63 V
operating supply voltage range. However, frequency
stability degrades below 1.5 V and steadily degrades
as it approaches the 1.2 V minimum supply due to the
internal regulator limitations. Between 1.2 V and 1.5 V,
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 >100 ms. The slow frequency of a
32 kHz clock will give false readings with faster gate times.
Contact SiTime for applications that require a wider supply
voltage range >3.63 V or lower frequency options as low as 1 Hz.
Figure 3. 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 t he 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 VOH and VOL are individually
factory programmed to the customers’ requirement. VOH
programming range is between 600 mV and 1.225 V in
100 mV increments. Similarly, VOL programming range is
between 350 mV and 800 mV. For example; a PMIC or MCU
is internally 1.8 V logic compatible, and requires a 1.2 V VIH
and a 0.6 V VIL. 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
VOL is limited to 350 mV and the maximum allowable swing
(VOH – VOL) is 750 mV. For example, 1.1 V VOH and 400 mV
VOL is acceptable, but 1.2 V VOH and 400 mV VOL is not
acceptable.
When the output is interfacing to an XTAL input that is
internally 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.
Temperature (°C)
Quartz XTAL
-160 to -220 ppm Over
Temp
SiT153x Industrial Temp Specification
SiT1532 10 ppm Max @ 25°C
Frequency Stability (ppm)
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
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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 1.5 V. For applications that operate between
1.2 V and 1.5 V, the start-up time will be typically 50 ms
longer over temperature.
SiT1532 NanoDrive™
Figure 4 shows a typical output waveform of the SiT1532
(into a 10 pF load) when factory programmed for a
0.70 V swing and DC bias (VOH/VOL) for 1.8 V logic:
Example:
▪ NanoDrive™ part number coding: D14.
Example part number: SiT1532AI-J4-D14-32.768
▪ VOH = 1.1 V, VOL = 0.4 V (V_sw = 0.70 V)
Figure 4. SiT1532AI-J4-D14-32.768
Output Waveform (10 pF load)
Table 4 shows the supported NanoDrive™ VOH, VOL
factory programming options.
Table 4. Acceptable VOH/VOL NanoDrive™ Levels
NanoDrive
VOH (V)
VOL (V)
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 = 1.8 V) 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 = 1.8 V) into 15 pF Load
VSW = 0.7 V
VOL = 0.4 V
VOH = 1.1 V
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
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Calculating Load Current
No Load Supply Current
When calculating no-load power for the SiT1532, the core
and output driver components need to be added. Since the
output voltage swing can be programmed for reduced swing
between 250 mV and 800 mV for ultra-low power
applications, the output driver current is variable.
Therefore, no-load operating supply current is broken into
two sections; core and output driver. The equation is as
follows:
Total Supply Current (no load) =
Idd Core + (65 nA/V)(Voutpp)
Example 1: Full-swing LVCMOS
◼ Vdd = 1.8 V
◼ Idd Core = 900 nA (typ)
◼ Voutpp = 1.8 V
Supply Current = 900 nA + (65 nA/V)(1.8 V) = 1017 nA
Example 2: NanoDrive™ Reduced Swing
◼ Vdd = 1.8 V
◼ Idd Core = 900 nA (typ)
◼ Voutpp (D14) = VOH – VOL = 1.1 V - 0.4 V = 700 mV
Supply Current = 900 nA + (65 nA/V)(0.7 V) = 946 nA
Total Supply Current with Load
To calculate the total supply current, including the load,
follow the equation listed below. Note the 30% reduction in
power with NanoDrive™.
Total Current = Idd Core + Idd Output Driver
(65nA/V*Voutpp) + Load Current (C*V*F)
Example 1: Full-swing LVCMOS
◼ Vdd = 1.8 V
◼ Idd Core = 900 nA
◼ Load Capacitance = 10 pF
◼ Idd Output Driver: (65 nA/V)(1.8 V) = 117 nA
◼ Load Current: (10 pF)(1.8 V)(32.768 kHz) = 590 nA
Total Current = 900 nA + 117 nA + 590 nA = 1.6 µA
Example 2: NanoDrive™ Reduced Swing
◼ Vdd = 1.8 V
◼ Idd Core = 900 nA
◼ Load Capacitance = 10 pF
◼ Voutpp (D14): VOH – VOL = 1.1 V - 0.4 V = 700 mV
◼ Idd Output Driver: (65 nA/V)(0.7 V) = 46 nA
◼ Load Current: (10 pF)(0.7 V)(32.768 kHz) = 229 nA
Total Current = 900 nA + 46 nA + 229 nA = 1.175 µA
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
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Typical Operating Curves
(TA = 25°C, Vdd = 1.8V, unless otherwise stated)
Min/Max Limit
Number of Devices
Initial Tolerance (ppm)
TA = 25
°
C Post Reflow, No underfill
30
25
20
10
5
-15 -10 -5 0 5 10 15
15
Figure 6. Initial Tolerance Histogram
Figure 7. Frequency Stability Over Temperature
Figure 8. Core Current Over Temperature
Figure 9. Output Stage Current Over Temperature
Figure 10. Start-up Time
when Vdd = 1.5 V
Time (sec)
Voltage (V)
Temperature (°C)
Temperature (°C)
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
Rev 1.28
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Vdd 1.8 V
Vdd 3.3 V
Noise Injection Frequency (Hz)
Frequency Error due to Power Supply Noise Injection, ±150 mV
Frequency Error (ppm)
1k
-10
-5
0
5
10
10k 100k 1M 10M
Figure 11. Power Supply Noise Rejection
(±150 mV Noise)
Figure 12. NanoDrive™ Output Waveform
(VOH = 1.1 V, VOL = 0.4 V; SiT1532AI-J4-D14-32.768)
Figure 13. LVCMOS Output Waveform
(Vswing = 1.8 V, SiT1532AI-J4-DCC-32.768)
VSW = 0.7 V
VOL = 0.4 V
VOH = 1.1 V
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
Rev 1.28
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Dimensions and Patterns
Package Size – Dimensions (Unit: mm)
Recommended Land Pattern (Unit: mm)
#1 #2
#4 #3
(soldermask openings shown with
dashed line around NSMD pad)
Recommended 4-mil (0.1mm) stencil thickness
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
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Manufacturing Guidelines
1) No Ultrasonic Cleaning: Do not subject the SiT1532 to
an ultrasonic cleaning environment. Permanent
damage or long term reliability issues to the MEMS
structure may occur.
2) Applying board-level underfill (BLUF) to the device is
acceptable, but will cause a shift in the frequency
tolerance, as specified in the datasheet electrical
table. Tested with UF3810, UF3808, and FP4530
underfill.
3) Reflow profile, per JESD22-A113D.
4) For additional manufacturing guidelines and marking/
tape-reel instructions, refer to SiTime Manufacturing
Notes.
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
Rev 1.28
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Ordering Information
Part number characters in blue represent the customer specific options. The other characters in the part number are fixed.
SiT1532A I -J4-D14-32.768 Q
Output Clock Frequency
32.768 kHz
Part Family
“SiT1532”
Revision Letter
“A”: is the revision
Temperature Range
“I”: Industrial, -40 to 85˚C
“C”: Commercial, -10 to 70˚C
Package Size
1.5 mm x 0.8 mm CSP
Frequency Stability
“4”: 100 ppm (-40 to 85˚C)
“5”: 75 ppm (-10 to 70˚C)
Output Voltage Setting
NanoDrive™ Reduced Swing Output
Refer to Table 5 for output setting options
“A”: AC-coupled signal path
“D”: DC-coupled signal path
DCC: LVCMOS Output
Packaging
Samples in cut Tape & Reel strips
“S”: 8 mm Tape & Reel, 10 ku reel
“D”: 8 mm Tape & Reel, 3 ku reel
“E”: 8 mm Tape & Reel, 1 ku reel
“Q”: 8 mm Tape & Reel, 5 ku reel
The following examples illustrate how to select the appropriate temp range and output voltage requirements:
Example 1: SiT1532AI-J4-D14-32.768
1) Industrial temp & corresponding 100 ppm
frequency stability. Note, 100 ppm is only available
for the industrial temp range, and 75 ppm is only
available for the commercial temp range.
2) Output swing requirements:
a) “D” = DC-coupled receiver
b) “1” = VOH = 1.1 V
c) “4” = VOL = 400 mV
Example 2: SiT1532AC-J5-AA3-32.768
1) Commercial temp & corresponding 75 ppm
frequency stability. Note, 100 ppm is only available
for the industrial temp range, and 75 ppm is only
available for the commercial temp range.
2) Output swing requirements:
a) “A” = AC-coupled receiver
b) “A” = AC-coupled receiver
c) “3” = 300 mV swing
Table 5. Acceptable VOH/VOL NanoDrive™ Levels[5]
NanoDrive
VOH (V)
VOL (V)
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
Note:
5. If these available options do not accommodate your application, contact Factory for other NanoDrive options.
SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
Rev 1.28
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Table 6. Revision History
Version
Release Date
Change Summary
1.0
Sep 2, 2014
Rev 0.9 Preliminary to Rev 1.0 Production Release
Updated start-up time specification
Added typical operating plots
Separated initial tolerance spec for condition with and without underfill
Added Manufacturing Guidelines section
1.1
Oct 14, 2014
Improved Start-up Time at Power-up spec
Added 5pF LVCMOS rise/fall time spec
1.2
11/07/2014
Updated 5pF LVCMOS rise/fall time spec
1.25
Jun 3, 2016
Updated NanoDrive section
Updated test conditions in the absolute maximum table
1.26
Mar 15, 2018
Updated SPL, page layout changes
1.27
Mar 15, 2018
Updated POD (Package Outline Drawing)
Updated logo and company address, other page layout changes
1.28
Nov 23, 2020
Formatting, rev table date format, TempFlat MEMS logo and trademarks update
Added Q-suffix to the Ordering table options
SiTime Corporation, 5451 Patrick Henry Drive, Santa Clara, CA 95054, USA | Phone: +1-408-328-4400 | Fax: +1-408-328-4439
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