The Smart Timing Choice



The Smart Timing Choice



SiTime Corporation

990 Almanor Avenue, Sunnyvale, CA 94085

(408) 328-4400

www.sitime.com

Rev. 1.0

Revised May 14, 2015

SiT2018B

High Temp, Single-Chip, One-Output Clock Generator

Features

Applications



Frequencies between 1 MHz and 110 MHz accurate to 6 decimal

places



Industrial, medical, automotive, avionics and other high temper-

ature applications



Operating temperature from -40°C to 125°C. For -55°C option, refer

to SiT2020 and SiT2021



Industrial sensors, PLC, motor servo, outdoor networking

equipment, medical video cam, asset tracking systems, etc.



Supply voltage of 1.8V or 2.5V to 3.3V



Excellent total frequency stability as low as ±20 ppm



Low power consumption of 3.5 mA typical at 1.8V



LVCMOS/LVTTL compatible output



5-pin SOT23-5 package: 2.9mm x 2.8mm



RoHS and REACH compliant, Pb-free, Halogen-free and

Antimony-free



For AEC-Q100 clock generators, refer to SiT2024 and SiT2025

Electrical Specifications

Table 1. Electrical Characteristics

All Min and Max limits are specified over temperature and rated operating voltage with 15 pF output load unless otherwise stated. Typical values

are at 25°C and nominal supply voltage.

Parameters

Symbol

Min.

Typ.

Max.

Unit

Condition

Frequency Range

Output Frequency Range

f

1

–

110

MHz

Refer to Table 14 for the exact list of supported frequencies

list of supported frequencies

Frequency Stability and Aging

Frequency Stability

F_stab

-20

–

+20

ppm

Inclusive of Initial tolerance at 25°C, 1st year aging at 25°C, and

variations over operating temperature, rated power supply

voltage and load (15 pF ± 10%).

-25

–

+25

ppm

-30

–

+30

ppm

-50

–

+50

ppm

Operating Temperature Range

Operating Temperature Range

(ambient)

T_use

-40

–

+105

°C

Extended Industrial

-40

–

+125

°C

Automotive

Supply Voltage and Current Consumption

Supply Voltage

Vdd

1.62

1.8

1.98

V

2.25

2.5

2.75

V

2.52

2.8

3.08

V

2.7

3.0

3.3

V

2.97

3.3

3.63

V

2.25

–

3.63

V

Current Consumption

Idd

–

3.8

4.7

mA

No load condition, f = 20 MHz, Vdd = 2.8V, 3.0V or 3.3V

–

3.6

4.5

mA

No load condition, f = 20 MHz, Vdd = 2.5V

–

3.5

4.5

mA

No load condition, f = 20 MHz, Vdd = 1.8V

OE Disable Current

I_od

–

–

4.5

mA

Vdd = 2.5V to 3.3V, OE = Low, Output in high Z state.

–

–

4.3

mA

Vdd = 1.8V, OE = Low, Output in high Z state.

Standby Current

I_std

–

2.6

8.5

A

Vdd = 2.8V to 3.3V, ST = Low, Output is weakly pulled down

–1.4

5.5

A

Vdd = 2.5V, ST = Low, Output is weakly pulled down

–0.6

4.0

A

Vdd = 1.8V, ST = Low, Output is weakly pulled down

LVCMOS Output Characteristics

Duty Cycle

DC

45

–

55

%

All Vdds

Rise/Fall Time

Tr, Tf

–

1.0

2.0

ns

Vdd = 2.5V, 2.8V, 3.0V or 3.3V, 20% - 80%

–

1.3

2.5

ns

Vdd =1.8V, 20% - 80%

–

1.0

3

ns

Vdd = 2.25V - 3.63V, 20% - 80%

Output High Voltage

VOH

90%

–

–

Vdd

IOH = -4 mA (Vdd = 3.0V or 3.3V)

IOH = -3 mA (Vdd = 2.8V or 2.5V)

IOH = -2 mA (Vdd = 1.8V)

Output Low Voltage

VOL

–

–

10%

Vdd

IOL = 4 mA (Vdd = 3.0V or 3.3V)

IOL = 3 mA (Vdd = 2.8V or 2.5V)

IOL = 2 mA (Vdd = 1.8V)