SIT9375AE-02B8-1810-062.500000D datasheet, PDF

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SiT9375

Low Jitter Differential XO for Standard Frequencies

ADVANCED

Description

The SiT9375 is a differential MEMS oscillator that is

engineered for low-jitter applications requiring standard

frequencies from 25 MHz to 644.53125 MHz.

A unique FlexSwing output-driver performs like LVPECL

but provides independent control of voltage swing and DC

offset to simplify interfacing with chipsets having non-

standard input voltage requirements and eliminate all

external source-bias resistors. The device also integrates

multiple on-chip regulators to filter power supply noise,

eliminating the need for an external dedicated LDO.

The SiT9375 can be factory programmed for specific

combinations of frequency, stability, voltage, output

signaling, and pin 1 functionality. Programmability enables

designers to optimize clock configurations while

eliminating long lead times and customization costs

associated with quartz devices where each combination is

custom built.

The wide frequency range and programmability makes

this device ideal for communications, enterprise, and

industrial applications that require a variety of frequencies

and operate in noisy environments.

Refer to

Manufacturing Notes

for proper reflow profile,

tape and reel dimension, and other manufacturing related

information.

Features

◼

Standard frequencies from 25 MHz to 644.53125 MHz

200 fs RMS typical phase jitter, 12 kHz to 20 MHz

Excellent power-supply noise rejection

LVPECL, LVDS, HCSL, Low-power HCSL, and

FlexSwing signaling options

±20, ±25, ±30, and ±50 ppm frequency stabilities

Wide temperature support up to -40°C to 105°C

Factory programmable options for low lead time

1.8 V, 2.5 V, 3.3 V, and wide continuous range power

supply voltage

2 x 1.6, 2.5 x 2, 3.2 x 2.5 mm x mm package

(Contact

SiTime

for 7 x 5, and 5 x 3.2 mm x mm

packages)

Applications

◼

100G/200G/400G network equipment

Optical modules

Coherent optics

Network switches, routers

Industrial networking equipment

Server and storage systems

Industrial networks

Test and measurement

Broadcast video

Block Diagram

Package Pinout

OE/NF

GND

VDD

OUTN

OUTP

Figure 1. SiT9375 Block Diagram

Figure 2. Pin Assignments (Top view)

(Refer to

Table 17

for Pin Descriptions)

Rev 0.52

July 28, 2020

www.sitime.com

SiT9375

Low Jitter Differential XO for Standard Frequencies

Ordering Information

ADVANCED

SiT9375AC-01B2-3310-125.000000T

Part Family

“SiT9375”

Revision Letter

“A” is the revision of Silicon

Temperature Range

“C”:

“I”:

“B”:

“E”:

Extended Commercial, -20 to 70°C

Industrial, -40 to 85°C

-40 to 95°C

Extended Industrial, -40 to 105°C

Reserved

“0-”: Default

Pin 1 Functionality

Signaling Group

“-”: LVPECL, LVDS, HCSL, Low-power

HCSL

“1”: FlexSwing referenced to voltage

on VDD pin.

For FlexSwing referenced to voltage

on GND pin,

Contact SiTime.

Signaling Type

“01”: LVPECL

“02”: LVDS

“04”: HCSL

“08”: Low-power HCSL, with integrated

series termination

“FS”: FlexSwing, VHn=Vdd − 1.05 V,

VLn=Vdd − 1.55 V, see

Table 5.

Contact SiTime

for other options.

Frequency Stability

“1”:

“2”:

“8”:

“3”:

±20 ppm

±25 ppm

±30 ppm

±50 ppm

“0”: NF (no function)

“1”: OE active high

“2”: OE active low

Supply Voltage

“18”: 1.8 V ±5%

“25”: 2.5 V ±10%

“33”: 3.3 V ±10%

“XX”: 2.25 V to 3.63 V

“YY”: 1.71 V to 3.63 V

Frequency

Refer to the frequencies in Table 1

Packaging

Refer to

Table 2

for packing method

Leave blank for bulk (for sampling only)

Package Size

“P”: 2.0 x 1.6 mm x mm

“A”: 2.5 x 2.0 mm x mm

“B”: 3.2 x 2.5 mm x mm

Table 1. Supported Frequencies

25.000000 MHz

98.304000 MHz

153.600000 MHz

212.500000 MHz

30.720000 MHz

100.000000 MHz

155.520000 MHz

250.000000 MHz

50.000000 MHz

106.250000 MHz

156.250000 MHz

300.000000 MHz

53.125000 MHz

122.880000 MHz

159.375000 MHz

312.500000 MHz

61.440000 MHz

125.000000 MHz

160.000000 MHz

322.265625 MHz

62.500000 MHz

133.333333 MHz

161.132813 MHz

625.000000 MHz

74.250000 MHz

148.500000 MHz

166.666666 MHz

644.531250 MHz

75.000000 MHz

150.000000 MHz

200.000000 MHz

Table 2. Ordering Codes for Supported Tape & Reel Packing Method

Device Size

(mm x mm)

2.0 x 1.6

2.5 x 2.0

3.2 x 2.5

8 mm T&R

(3ku)

8 mm T&R

(1ku)

Rev 0.52

Page 2 of 23

www.sitime.com

SiT9375

Low Jitter Differential XO for Standard Frequencies

TABLE OF CONTENTS

ADVANCED

Description ................................................................................................................................................................................... 1

Features ....................................................................................................................................................................................... 1

Applications .................................................................................................................................................................................. 1

Block Diagram .............................................................................................................................................................................. 1

Package Pinout ............................................................................................................................................................................ 1

Ordering Information .................................................................................................................................................................... 2

Electrical Characteristics .............................................................................................................................................................. 4

Pin Description ........................................................................................................................................................................... 11

FlexSwing Configurations ........................................................................................................................................................... 12

Waveform Diagrams................................................................................................................................................................... 14

Termination Diagrams ................................................................................................................................................................ 17

LVPECL and FlexSwing Termination .................................................................................................................................. 17

LVDS, Supply Voltage: 1.8 V

±5%,

2.5 V ±10%, 3.3 V ±10%, 2.25 V to 3.63 V, 1.71 V to 3.63 V ...................................... 18

HCSL, Supply Voltage: 1.8 V

±5%,

2.5 V ±10%, 3.3 V ±10%, 2.25 V to 3.63 V, 1.71 V to 3.63 V ...................................... 18

Low-power HCSL, Supply Voltage: 1.8 V

±5%,

2.5 V ±10%, 3.3 V ±10%, 2.25 V to 3.63 V, 1.71 V to 3.63 V.................... 18

Dimensions and Patterns ― 2.0 x 1.6 mm x mm ....................................................................................................................... 19

Dimensions and Patterns ― 2.5 x 2.0 mm x mm ....................................................................................................................... 20

Dimensions and Patterns ― 3.2 x 2.0 mm x mm ....................................................................................................................... 21

Additional Information................................................................................................................................................................. 22

Revision History ......................................................................................................................................................................... 22

Rev 0.52

Page 3 of 23

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SiT9375

Low Jitter Differential XO for Standard Frequencies

Electrical Characteristics

ADVANCED

All Min and Max limits in the Electrical Characteristics tables are specified over operating temperature and rated operating

voltage with standard output termination shown in the termination diagrams. Typical values are at 25°C and nominal

supply voltage.

Table 3. Electrical Characteristics – Common to All Output Signaling Types

Parameter

Output Frequency Range

Frequency Stability

Symbol

F_stab

–

Min.

Typ.

Max.

Unit

MHz

ppm

Condition

Refer to frequencies listed in

Ordering Information

section.

Inclusive of initial tolerance, operating temperature, rated power

supply voltage, load variation of 15 pF

10%, and 10 years

aging at 25°C

Inclusive of initial tolerance, operating temperature, rated power

supply voltage, load variation of 15 pF

10%, and first year aging

at 25°C

Ambient temperature of 25°C

Extended commercial, ambient temperature

Industrial, ambient temperature

Ambient temperature

Extended industrial, ambient temperature

Voltage-supply order code “YY”

Voltage-supply order code “XX”

Voltage-supply order code “18”.

Contact SiTime

for 1.5 V

Voltage-supply order code “25”

Voltage-supply order code “33”

Pins 1 and 2 for OE and SE, respectively

See

Figure 5

and

Figure 7

Measured from the time Vdd reaches its rated minimum value

Measured from the time OE pin toggles to enable logic level to

the time clock pins reach 90% of swing. See

Figure 12

Measured from the time OE pin toggles to disable logic level to

the last clock edge. See

Figure 13

12 kHz to 20 MHz offset frequency integration bandwidth,

156.25 MHz

12 kHz to 20 MHz offset frequency range, 156.25 MHz

12 kHz to 20 MHz offset frequency range, 155.52 MHz

156.25 MHz

Frequency Range

Standard frequencies

–

±20

Frequency Stability

–

10 Year Aging

Operating Temperature Range

F_10y

T_use

–

-20

-40

Supply Voltage

Vdd

1.71

2.25

1.71

2.25

2.97

Input Voltage High

Input Voltage Low

Input Pull-up Impedance

Duty Cycle

Startup Time

Output Enable Time

Output Disable Time

VIH

VIL

Z_in

T_start

T_oe

T_od

70%

–

±1

–

1.80

2.50

3.30

–

100

–

±25

±30

±50

–

+70

+85

+95

+105

ppm

°C

Temperature Range

Supply Voltage

3.63

1.89

2.75

3.63

Input Characteristics

–

Vdd

30%

–

100+3 clock

cycles

100+3 clock

cycles

Vdd

kΩ

Output Characteristics

Startup, OE and SE Timing

Jitter and Phase Noise

RMS Phase Jitter (random)

Spurious Phase Noise

RMS Period

Jitter

[1]

Jitter

[1]

T_phj

PN_spur_a

PN_spur_b

T_jitt_per

T_jitt_cc

Peak Cycle-to-cycle

–

200

-110

-80

–

dBc

Note:

1. Measured according to JESD65B.

Rev 0.52

Page 4 of 23

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SiT9375

Low Jitter Differential XO for Standard Frequencies

ADVANCED

Table 4. Electrical Characteristics – LVPECL

Supply voltages: 2.5 V

±10%,

3.3 V

±10%,

2.25 V to 3.63 V

Parameter

Current Consumption, Output

Enabled without Termination

Current Consumption, Output

Enabled with Termination 1

Current Consumption, Output

Enabled with Termination 2

Current Consumption, Output

Disabled without Termination

Current Consumption Output

Disabled with Termination 1

Current Consumption, Output

Disabled with Termination 2

OE Leakage Current

Symbol

Idd_oe_nt

Idd_oe_wt1

Idd_oe_wt2

Idd_od_nt

Idd_od_wt1

Idd_od_wt2

I_leak

Min.

–

Typ.

Max.

–

Unit

Condition

Excluding load termination current

Including load termination current. See

Figure 15

for

termination

Including load termination current. See

Figure 18

for

termination

Excluding load termination current

Including load termination current. See

Figure 15

for

termination

Including load termination current. See

Figure 18

for

termination

OE = disable logic, DC termination, OUTP and OUTN held

at constant voltage, see

Figure 13.

Use AC termination to

reduce I_leak to 0 mA.

See

Figure 4

See

Figure 4

See

Figure 5

20% to 80%. See

Figure 5

See

Figure 8

See

Figure 9

Measured as percent of V_Swing; see

Figure 10

Power supply ripple from 1 kHz to 20 MHz

156.25 MHz, 50 mV peak-peak ripple on VDD

Current Consumption, f = 156.25 MHz

Output Characteristics

Output High Voltage

Output Low Voltage

Output Differential Voltage Swing

Rise/Fall Time

Differential Asymmetry, peak-peak

Differential Skew, peak

Overshoot Voltage, peak

Power Supply-Induced Jitter

Sensitivity

[2]

Power Supply-Induced Phase

Noise

VOH

VOL

V_Swing

Tr, Tf

V_da

V_ds

V_ov

PSJS

PSPN

Vdd-1.025 Vdd-0.95

Vdd-1.81

1.2

–

Vdd-1.7

1.5

170

100

±40

0.01

-80

Vdd-0.88

Vdd-1.62

1.9

–

ps/mV

dBc

Power Supply Noise Immunity

Rev 0.52

Page 5 of 23

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