Ultra-Small, Ultra-Low Power 1 Hz - 32.768 kHz Programmable Oscillator
The Smart Timing Choice
Features
Applications
Factory programmable from 32.768 kHz down to 1 Hz
<20 ppm frequency tolerance
Smallest footprint in chip-scale (CSP): 1.5 x 0.8 mm
Pin-compatible to 2.0 x 1.2 mm XTAL SMD package
Ultra-low power: <1µA
Vdd supply range: 1.5V to 3.63V over -40°C to +85°C
Supports low-voltage battery backup from a coin cell or supercap
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
Programmable Output Frequency
Frequency Tolerance
[1]
Symbol
Min.
1.00
Typ.
Max.
Unit
Condition
Factory programmed between 1 and 32.768 kHz in powers of 2
T
A
= 25°C, post reflow, includes underfill, Vdd: 1.5V – 3.63V
T
A
= -10°C to +70°C, Vdd: 1.5V – 3.63V.
T
A
= -40°C to +85°C, Vdd: 1.5V – 3.63V.
T
A
= -10°C to +70°C, Vdd: 1.2V – 1.5V.
Frequency and Stability
32768.0
Hz
Frequency Stability
20
75
100
ppm
ppm
F_tol
F_stab
-1
1.2
1.5
Idd
[3]
Frequency Stability
[2]
25°C Aging
Operating Supply Voltage
Vdd
ppm
1st Year
Supply Voltage and Current Consumption
V
T
A
= -10°C to +70°C
3.63
V
3.63
T
A
= -40°C to +85°C
0.9
1.3
1.4
0.065
0.125
100
300 + 1
period
500 + 1
period
μA
μA/Vpp
ms
T
A
= 25°C, Vdd: 1.8V. No load
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
T
A
= -40°C to +85°C, 0 to 100% Vdd
T
A
= 25°C ±10°C, valid output
ms
T
A
= -40°C to +85°C, valid output
250
1
Core Operating Current
[3]
Output Stage Operating Current
Power-Supply Ramp
Idd_out
t_Vdd_
Ramp
t_start
Start-up Time
[4]
Commercial Temperature
Industrial Temperature
Output Rise/Fall Time
Output Clock Duty Cycle
Output Voltage High
Output Voltage Low
T_use
-10
-40
Operating Temperature Range
70
°C
85
°C
LVCMOS Output Option, T
A
= -40°C to +85°C, typical value is T
A
= 25°C
tr, tf
100
200
ns
10-90% (Vdd), 15 pF load, Vdd = 1.5V to 3.63V
DC
VOH
VOL
48
90%
10%
52
%
V
V
Vdd: 1.5V – 3.63V. I
OH
= -10μA,
15
pF
Vdd: 1.5V – 3.63V. I
OL
= 10μA, 15
pF
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 1.25
990 Almanor Avenue, Sunnyvale, CA 94085
(408) 328-4400
www.sitime.com
Revised April 3, 2016
SiT1534
Ultra-Small, Ultra-Low Power 1 Hz - 32.768 kHz Programmable Oscillator
The Smart Timing Choice
Electrical Characteristics
(continued)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
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
T_djitt
tf, tf
DC
48
0.20 to
0.80
0.60 to
1.225
0.35 to
0.80
-0.055
0.055
200
52
ns
%
SiT1534 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
V_sw
V
VOH
VOL
V
V
V
Jitter Performance
Period Jitter
35
ns
RMS
Cycles = 10,000, T
A
= 25°C, Vdd = 1.5V – 3.63V
Pin Configuration (SMD)
Pin
1
Symbol
NC
I/O
No Connect,
don’t care
Power Supply
Ground
OUT
Functionality
No Connect. Will not respond to any input signal. When the SiT1534 is
used as an alternative to an XTAL, this pin is typically connected to the
receiving ICs X Out pin. In this case, the SiT1534 will not be affected by
the signal on this pin.
Connect to ground.
Oscillator clock output. When the SiT1534 is used as an alternative to an
XTAL, the CLK Out is typically connected to the receiving ICs X IN pin.
No need for load capacitors. The output driver is independent of capac-
itive loading.
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
filtering, see the
Power Supply Noise Immunity
section in the detailed
description.
Contact factory for applications that require a wider operating supply
voltage range.
SMD Package (Top View)
Vdd
4
2
GND
3
CLK Out
NC
1
2
3
CLK Out
GND
4
Vdd
Power Supply
Pin Configuration (CSP)
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.
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
filtering, see the
Power Supply Noise Immunity
section in the detailed
description.
Contact factory for applications that require a wider operating supply
voltage range.
CSP Package (Top View)
GND
1
4
2
CLK Out
OUT
GND
3
Vdd
Power Supply
CLK Out
2
3
Vdd
Rev. 1.25
Page 2 of 12
www.sitime.com
SiT1534
Ultra-Small, Ultra-Low Power 1 Hz - 32.768 kHz Programmable Oscillator
The Smart Timing Choice
System Block Diagram
MEMS Resonator
NC or
GND
Control
Frequency
Adjust
Regulators
Vdd
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 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 (HBM) ESD Protection
Charge-Device Model (CDM) ESD Protection
Machine Model (MM) ESD Protection
Latch-up Tolerance
Mechanical Shock Resistance
Mechanical Vibration Resistance
2012 SMD Junction Temperature
1508 CSP Junction Temperature
Storage Temperature
≤30
minutes
Vdd = 1.5V - 3.63V
Vdd = 1.5V - 3.63V,
≤30
mins
JESD22-A114
JESD22-C101
JESD22-A115
JESD78 Compliant
Mil 883, Method 2002
Mil 883, Method 2007
10,000
70
150
150
-65°C to 150°C
g
g
°C
°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. 1.25
Page 3 of 12
www.sitime.com
SiT1534
Ultra-Small, Ultra-Low Power 1 Hz - 32.768 kHz Programmable Oscillator
The Smart Timing Choice
Description
The SiT1534 is the first programmable oscillator capable of a
frequency range between 32.768 kHz down to 1 Hz for true
1. Introduction
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