kHz xtal, the OLD

kHz MEMS OSC, the NEW µA IoT • Wearables

Abracon has introduced its new series of watch-MEMS® kHz MEMS oscillators, featuring the World’s Smallest CSP (1.5x0.8mm) & SMD (2.0x1.2 mm) packages. This series is based on a proprietary MEMS resonator technology, yielding best-in-class kHz timing reference. These devices are ideally suited for tuning fork crystal replacement in space constrained designs. Optimized for the Wearable, IoT & Consumer solutions, these devices provide temperature stabilized alternative to tuning fork crystal based timing, while eliminating the oscillator loop capacitors, saving significant surface area, complexity & frequency variation over temperature.

Offered with both temperature stabilized (±75ppm or ±100ppm over -40°C to +85°C) version and temperature compensated (±5ppm, ±10ppm or ±20ppm over -40°C to +85°C) version; this series offers designers great flexibility to replace a typical tuning fork watch crystal with a precise 32.768kHz clocking solution.

Initial Tolerance Histogram

Initial Tolerance (ppm) TA = 25˚C Post Reflow

Num

ber o

f Dev

ices

Frequency Stability vs. Operating Temperature Range

Freq

uenc

y St

abili

ty (P

PM)

Temperature (˚C)

Core Current vs Operating Temperature Range

Core

Cur

eent

(uA)

Temperature (˚C)

Start-up Time

Volta

ge (V

)

Time (sec)

Series Description Package Size

ASTMTXK

Temperature compensa ted, ultra -

miniature 32.768kHz MEMS oscillator

1.54 x 0.84 x 0.6mm

ASTMKJ

Low -power, ultra -miniature 3 2.768kHz

MEMS oscillator, with Programmable Output

Swing

1.54 x 0.84 x 0.6mm

ASTMKH

Low -power, ultra -miniature 32.768kHz

MEMS oscillator, with Programma ble Output

Swing

2.0 x 1.2 x 0.6mm

ASTMK

Low -power, ultra -miniature

1Hz ~ 32.768kHz MEMS oscillator, with

Programmable Output Swing

1.54 x 0.84 x 0.6mm 2.0 x 1.2 x 0.6mm

ASTMK 06 Low -power,

ultra -miniature 32.768kHz MEMS oscillator

2.0 x 1.2 x 0.6mm

Vdd = 3.63V

Vdd = 1.5 - 1.8V

kHz xtal, the OLD

kHz MEMS OSC, the NEW µA IoT • Wearables

Why should designers consider watch-MEMS® for RTC Timing!!

Typical Pierce Oscillator Loop for RTC applications

• Uses a Tuning Fork Quartz Crystal• Requires (2) oscillator loop capacitors• Set-tolerance is contingent upon accurately matching the crystal plating load to the capacitance of the oscillator loop, best-case ±10 ppm• Frequency stability over -40°C to +85°C is worse than ±175 ppm• Total solution consumes the following surface area:

Pierce Oscillator Loop using watch-MEMS®

• No oscillator loop capacitors are needed• No by-pass capacitor is needed • Set-tolerance is typically better than ±5 ppm for temperature stabilized version and better than ±2.5 ppm for TCXO version• Frequency stability over -40°C to +85°C is typically better than ±50ppm for temperature stabilized version and ±5 pp maximum for TCXO version • ASTMK series is available with Factory Programmable Output Swing, enabling it to be the drop-in replacement for Tuning Fork Crystals• Total solution consumes the following surface area:

R (Feedback)

Integrated Inverter

Tuning Fork Quartz Crystal

Loop

Cap

acito

r #2

Loop

Cap

acito

r #1

GND

32.k

Hz C

LK

80% smaller than2.0 x 1.2mm SMD Quartz Solution

60% smaller than1.6 x 1.0mm SMD Quartz Solution

8 mm2

consumes

using 3.2 x 1.5mm(Crystal)

5 mm2

consumes

using 2.0 x 1.2mm(Crystal)

3 mm2

consumes

using 1.6 x 1.0mm(Crystal)