SIT1534AI-H4-D26-02.048E,SIT1534AI-H4-D26-02.048E pdf中文资料,SIT1534AI-H4-D26-02.048E引脚图,SIT1534AI-H4-D26-02.048E电路-Datasheet-电子工程世界

文档预览

SiT1534

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

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

= -10°C to +70°C, Vdd: 1.5V – 3.63V.

= -40°C to +85°C, Vdd: 1.5V – 3.63V.

= -10°C to +70°C, Vdd: 1.2V – 1.5V.

Frequency and Stability

32768.0

Frequency Stability

100

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

= -10°C to +70°C

3.63

= -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

= 25°C, Vdd: 1.8V. No load

= -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

= -40°C to +85°C, 0 to 100% Vdd

= 25°C ±10°C, valid output

= -40°C to +85°C, valid output

250

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

°C

LVCMOS Output Option, T

= -40°C to +85°C, typical value is T

= 25°C

tr, tf

100

200

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

VOH

VOL

90%

10%

Vdd: 1.5V – 3.63V. I

= -10μA,

Vdd: 1.5V – 3.63V. I

= 10μA, 15

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

0.20 to

0.80

0.60 to

1.225

0.35 to

0.80

-0.055

0.055

200

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

/ 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

V_sw

VOH

VOL

Jitter Performance

Period Jitter

RMS

Cycles = 10,000, T

= 25°C, Vdd = 1.5V – 3.63V

Pin Configuration (SMD)

Symbol

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

GND

CLK Out

GND

Vdd

Power Supply

Pin Configuration (CSP)

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

CLK Out

OUT

GND

Vdd

Power Supply

CLK Out

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

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

150

-65°C to 150°C

°C

Test Condition

Value

-0.5 to 3.63

4.0

105

125

3000

750

300

Unit

°C

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

pulse-per-second (PPS) operation. SiTime’s silicon MEMS

technology enables the smallest footprint and chip-scale

packaging. In the chip-scale package (CSP), these devices

reduce footprint by as much as 80% compared to existing 2.0

x 1.2 mm SMD XTAL packages. Unlike XTALs, the SiT1534

oscillator output enables greater component placement flexi-

bility and eliminates external load capacitors, thus saving

additional component count and board space. And unlike

standard oscillators, the SiT1534 features NanoDrive™, a

factory programmable output that reduces the voltage swing

to minimize power.

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.

For applications that require XTAL resonator compatibility, the

SiT1534 is available in the 2.0 x 1.2 mm (2012) package.

Unlike XTAL resonators, SiTime’s silicon MEMS oscillators

require a power supply (Vdd) and ground (GND) pin. Vdd and

GND pins are conveniently placed between the two large

XTAL pins. When using the SiTime Solder Pad Layout (SPL),

the SiT1534 footprint is compatible with existing 32 kHz XTALs

in the 2012 SMD package. Figure 2 shows the comparison

between the quartz XTAL footprint and the SiTime footprint.

Quartz

SiTime

Connect to

X OUT or NC

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.

Frequency Stability

The SiT1534 is factory calibrated (trimmed) to guarantee

frequency stability to be less than 20 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 SiT1534 temperature coefficient is extremely flat across

temperature. This 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 3.

Functionality is guaranteed over the full supply voltage range.

However, frequency stability degrades below 1.5V and

steadily degrades as it approaches 1.2V due to the internal

regulator limitations.

When measuring the SiT1534 output frequency with a

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

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

will give false readings with faster gate times.

For applications that require a higher operating voltage range,

consider the SiT1544 with a 2.7V to 4.5V supply voltage range.

Frequency Stability (ppm)

SiT153x Industrial Temp Specification

SiT1534 20 ppm

Max @ 25C

X OUT

SiT1534 Measured

GND

VDD

Quartz XTAL

-160 to -220 ppm Over Temp

X IN

Clock Out

Connect to X IN

Top View

Temperature (°C)

Figure 2. SiT1534 Footprint Compatibility with

Quartz XTAL Footprint

[5]

Figure 3. SiTime vs. Quartz

Note:

5. On the SiTime device, X IN is not internally connected and will not respond to any signal. It is acceptable to connect to chipset X OUT.

Rev. 1.25

Page 4 of 12

www.sitime.com

SiT1534

Ultra-Small, Ultra-Low Power 1 Hz - 32.768 kHz Programmable Oscillator

The Smart Timing Choice

Power Supply Noise Immunity

In addition to eliminating external output load capacitors

common with standard XTALs, this device includes special

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

AC-noise greater than ±150 mVpp and beyond 10 MHz

frequency components.

SiT1534 NanoDrive™

Figure 4 shows a typical output waveform of the SiT1534 (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: SiT1534AI-J4-D14-32.768

• V

= 1.1V, V

= 0.4V (V

= 0.70V)

Programmable Frequency

The SiT1534 is the first oscillator to feature a programmable

frequency range between 1 Hz and 32.768 kHz in powers of

two. Reducing the frequency significantly reduces the output

load current (C*V*F). For example, reducing the frequency

from 32.768 kHz to 10 kHz improves load current by 70%.

Similarly, reducing the output frequency from 32.768 kHz down

to 1Hz reduces the load current by more than 99%.

The part number ordering shows the specific frequency

options.

= 1.1V

= 0.7V

= 0.4V

NanoDrive™ Reduced Swing Output Voltage

For low-power applications that drive directly into a chip-set’s

XTAL input, the reduced swing output is ideal. SiTime’s unique

NanoDrive™, factory-programmable output stage is optimized

for low voltage swing to minimize power and maintain compat-

ibility with the downstream oscillator input (X IN pin). The

SiT1534 output swing is factory programmed between 250 mV

and 800 mV. For DC-coupled applications, output V

and

are individually factory programmed. Contact SiTime for

programming support.

Figure 4. SiT1534AI-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

NanoDrive

D26

D14

D74

AA3

(V)

1.2

1.1

0.7

n/a

(V)

0.6

0.4

n/a

Swing (mV)

600

±55

700

±55

300

±55

300

±55

Comments

1.8V logic compatible

XTAL compatible

Power-up

The SiT1534 starts-up to a valid output frequency within

300 ms when operating at 32.768 kHz. For frequencies less

than 32.768 kHz, the start-up time can increase by an

additional clock period. The maximum start-up time over

temperature is 500 ms max over temperature plus a clock

period. For example, the maximum start-up time for a 256 Hz

clock is 500 ms + 3.9 ms. 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 require start-up between 1.2V and 1.5V, the

start-up time will be typically 50 ms longer.

SiT1534 Full Swing LVCMOS Output

The SiT1534 can be factory programmed to generate full-

swing LVCMOS levels. Figure 5 shows the typical waveform

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

Figure 5. LVCMOS Waveform

(Vdd = 1.8V) into 15 pF Load

Example:

• LVCMOS output part number coding is always

DCC

Example part number: SiT1534AI-J4-DCC-32.768

Rev. 1.25

Page 5 of 12

www.sitime.com