Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
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 Specifications
Table 1. Electrical Characteristics
Parameter
Programmable Output Frequency
Frequency Tolerance
Frequency Stability
25°C Aging
[1]
Symbol
Min.
1.00
Typ.
Max.
32768.0
20
75
100
250
Unit
Hz
ppm
ppm
ppm
V
V
μA
μA/Vpp
ms
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.
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
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
Frequency and Stability
Frequency Stability
F_tol
[2]
F_stab
-1
1.2
1.5
0.9
1
3.63
3.63
1.3
1.4
0.065
0.125
100
300 + 1
period
500 + 1
period
Supply Voltage and Current Consumption
Operating Supply Voltage
Vdd
Core Operating Current
[3]
Output Stage Operating Current
[3]
Power-Supply Ramp
Idd
Idd_out
t_Vdd_
Ramp
t_start
Start-up Time
[4]
ms
T
A
= -40°C to +85°C, valid output
Operating Temperature Range
Commercial Temperature
Industrial Temperature
Output Rise/Fall Time
Output Clock Duty Cycle
Output Voltage High
Output Voltage Low
T_use
-10
-40
100
48
90%
10%
70
85
200
52
°C
°C
ns
%
V
V
Vdd: 1.5V – 3.63V. I
OH
= -10μA, 15 pF
Vdd: 1.5V – 3.63V. I
OL
= 10μA, 15 pF
10-90% (Vdd), 15 pF load, Vdd = 1.5V to 3.63V
LVCMOS Output Option, T
A
= -40°C to +85°C, typical value is T
A
= 25°C
tr, tf
DC
VOH
VOL
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.
Rev 1.31
January 18, 2018
www.sitime.com
SiT1534
Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Table 1. Electrical Characteristics (continued)
Parameter
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
Symbol
tf, tf
DC
48
0.20 to
0.80
0.60 to
1.225
0.35 to
0.80
-0.055
0.055
Min.
Typ.
Max.
200
52
Unit
ns
%
SiT1534 does not internally AC-couple. This output description
is intended for a receiver that is AC-coupled. See
Table 6
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 5
for acceptable VOH/VOL setting levels.
Vdd: 1.5V – 3.63V. I
OL
= 0.2 μA, 10 pF Load. See
Table 5
for acceptable V
OH
/V
OL
setting levels.
T
A
= -40°C to +85°C, Vdd = 1.5V to 3.63V.
Condition
30-70% (V
OL
/V
OH
), 10 pF Load
NanoDrive™ Programmable, Reduced Swing Output
V_sw
V
VOH
VOL
V
V
V
Jitter Performance
Period Jitter
T_djitt
35
ns
RMS
Cycles = 10,000, T
A
= 25°C, Vdd = 1.5V – 3.63V
Table 2. Pin Configuration (SMD)
Pin
Symbol
I/O
No Connect,
don’t care
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.
NC
1
2
SMD Package (Top View)
Vdd
4
3
1
NC
2
GND
Power Supply
Ground
CLK Out
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 capacitive loading.
Connect to power supply 1.2V ≤ Vdd ≤ 3.63V. Under normal
operating conditions, Vdd does not require external
bypass/decoupling capacitor(s).
GND
3
CLK Out
OUT
Figure 1. Pin Assignments
(SMD)
4
Vdd
Power Supply
For more information about the internal power-supply filtering, see
the
Power Supply Noise Immunity
section in the detailed description.
Contact
SiTime
for applications that require a wider operating supply
voltage range.
Table 3. 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
SiTime
for applications that require a wider operating supply
voltage range.
CSP Package (Top View)
GND
1
4
GND
2
CLK Out
OUT
CLK Out
2
3
Vdd
3
Vdd
Power Supply
Figure 2. Pin Assignments
(CSP)
Rev 1.31
Page 2 of 12
www.sitime.com
SiT1534
Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
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 3. SiT1534 Block Diagram
Table 4. Absolute Maximum Limits
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
Mil 883, Method 2002
Mil 883, Method 2007
≤30 minutes
Vdd = 1.5V - 3.63V
Vdd = 1.5V - 3.63V, ≤30 mins
JESD22-A114
JESD22-C101
JESD22-A115
Test Condition
Value
-0.5 to 3.63
4.0
105
125
3000
750
300
JESD78 Compliant
10,000
70
150
150
g
g
°C
°C
-65°C to 150°C
Unit
V
V
°C
°C
V
V
V
Rev 1.31
Page 3 of 12
www.sitime.com
SiT1534
Ultra-Small, Ultra-Low Power 1 Hz – 32.768 kHz Programmable Oscillator
Description
The SiT1534 is the first programmable oscillator capable of a
frequency range between 32.768 kHz down to 1 Hz for true
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