10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
The Smart Timing Choice
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
10
Frequency Tolerance
[1]
Max.
Unit
kHz
Condition
Frequency and Stability
Frequency Stability
ppm
ppm
T
A
= 25°C, post reflow, Vdd: 1.5V – 3.63V.
T
A
= 25°C, post reflow with board-level underfill,
Vdd: 1.5V – 3.63V.
T
A
= -10°C to +70°C, Vdd: 1.5V – 3.63V.
ppm
ppm
V
V
μA
μA/Vpp
ms
ms
T
A
= -40°C to +85°C, Vdd: 1.5V – 3.63V.
T
A
= -10°C to +70°C, Vdd: 1.2V – 1.5V.
1st Year
T
A
= -10°C to +70°C
T
A
= -40°C to +85°C
T
A
= 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
70
85
T
A
= -10°C to +70°C, Vdd max: 3.63V. No load
T
A
= -40°C to +85°C, Vdd max: 3.63V. No load
T
A
= -40°C to +85°C, Vdd: 1.5V – 3.63V. No load
Vdd Ramp-up from 0 to 90%, T
A
= -40°C to +85°C
T
A
= -40°C ≤ T
A
≤ +50°C, valid output
T
A
= +50°C < T
A
≤ +85°C, valid output
F_tol
20
75
Frequency Stability
25°C Aging
[2]
F_stab
-1
1.2
1.5
0.90
100
250
1
3.63
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
°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
2
) CSP,
10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
The Smart Timing Choice
The Smart Timing Choice
Electrical Characteristics
(continued)
Parameter
Symbol
Min.
Typ.
100
Max.
200
50
48
90%
10%
52
Unit
Condition
LVCMOS Output Option, T
A
= -40°C to +85°C, typical values are at T
A
= 25°C
Output Rise/Fall Time
Output Clock Duty Cycle
Output Voltage High
Output Voltage Low
tr, tf
DC
VOH
VOL
ns
%
V
V
Vdd: 1.5V – 3.63V. I
OH
= -10 μA, 15 pF
Vdd: 1.5V – 3.63V. I
OL
= 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
DC
V_sw
48
0.20 to
0.80
0.60 to
1.225
0.35 to
0.80
-0.055
0.055
Jitter
35
ns
RMS
Cycles = 10,000, T
A
= 25°C, Vdd = 1.5V – 3.63V
200
52
ns
%
V
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
OH
/ I
OL
= ±0.2 μA.
Vdd: 1.5V – 3.63V. I
OH
= -0.2 μA, 10 pF Load. See Table 1 for
acceptable V
OH
/V
OL
setting levels.
Vdd: 1.5V – 3.63V. I
OL
= 0.2 μA, 10 pF Load. See Table 1 for
acceptable V
OH
/V
OL
setting levels.
T
A
= -40°C to +85°C, Vdd = 1.5V to 3.63V.
30-70% (V
OL
/V
OH
), 10 pF Load
VOH
VOL
V
V
V
Pin Configuration
Pin
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
loading.
CSP Package (Top View)
2
CLK Out
OUT
GND
1
4
GND
3
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
2
3
Vdd
Rev. 1.2
Page 2 of 12
www.sitime.com
SiT1532
Smallest Footprint (1.2mm
2
) CSP,
10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
The Smart Timing Choice
The Smart Timing Choice
System Block Diagram
MEMS Resonator
GND
Control
Regulators
Vdd
Trim
Prog
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
T
A
= 25°C
JESD78 Compliant
10,000
70
150
g
g
°C
Test Condition
Value
-0.5 to 3.63
4.0
105
125
3000
750
300
Unit
V
V
°C
°C
V
V
V
Rev. 1.2
Page 3 of 12
www.sitime.com
SiT1532
Smallest Footprint (1.2mm
2
) CSP,
10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement
The Smart Timing Choice
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
据外媒报道，萨里大学（University of Surrey）的研究人员开发出一种无需依赖GPS即可在人口密集的城市地区精确定位设备位置的人工智能系统。该系统可将定位误差从734米缩小到22米以内，这对于自动驾驶汽车和救援车辆等技术的发展意义重大。 图片来源： 萨里大学 在发表于《IEEE Robotics and Automation Letters》的论文中，研究人员介绍了PEn...[详细]
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