Micrel, Inc.

DSC2111FI2-E0019

Operational Description

The DSC2111FI2-E0019 is a dual output LVCMOS

oscillator consisting of a MEMS resonator and a supporting

PLL IC. The two LVCMOS outputs are generated through

independent 8-bit programmable dividers from the output

of the internal PLL. DSC2111FI2-E0019 allows for easy

programming of theoutput frequencies using I2C interface.

Upon power-up, the output frequencies are controlled

by an internal

pre-programmed memory (OTP). This

memory stores all coefficients required by the PLL for two

different default frequency pairs. The control pin (FS)

selects the initial pair. Once the device is powered up, a

new output frequency pair can be programmed using I2C

pins.

Programming

details

are

provided in

the

Programming Guide.

The DSC2111FI2-E0019 has independent control of the

output voltage levels of the two outputs. The high voltage

level of CLK1 is equal to the main supply voltage, VDD

(pin 13). VDD2 (pin 12) sets the high voltage level of

CLK2. VDD2 must be equal to or less than VDD at all

times to insure proper operation. VDD2 can be as low

as 1.65V. When OE (pin 1) is floated or connected to

VDD, the DSC2111FI2-E0019 is in operational mode.

Driving OE to ground will disable both output

drivers (hi-impedance mode).

DSC2111FI2-E0019 has programmable output drive

strength, which can be controlled via I2C.

Table 1 displays typical rise / fall times for the output

with a 15pF load capacitance as a function of these

control bits at VDD = 3.3V and room temperature.

Output Drive Strength Bits [OXS2, OXS1, OXS0] - Default is [111] - X = 1 for CLK1, and 2 for CLK2

000

001

010

011

100

101

110

111

tr (ns)

2.1

1.7

1.6

1.4

1.3

1.3

1.2

1.1

tf (ns)

2.5

2.4

2.4

2

1.8

1.6

1.3

1.3

Table 1. Rise/Fall Times for Drive Strengths

Output Clock Frequencies

Frequency select bits are weakly tied high so if left unconnected the default setting will be [1] and the device will output the

associated frequency highlighted in bold.

Freq (MHz)

Freq Select Bit [FS] - Default is [1]

0

1

CLK1

74.25

74.25

CLK2

148.5

148.5

Table 2. Pin-Selectable Output Frequencies

Absolute Maximum Ratings

Item

Min.

Max.

Units

Condition

Supply Voltage

-0.3

+4.0

V

Input Voltage

-0.3

VDD + 0.3

V

Junction Temp

-

+150

°C

Storage Temp

-55

+150

°C

Soldering Temp

-

+260

°C

40sec max.

ESD

HBM

MM

CDM

-

4000

400

1500

V

1000+ years of data retention on internal memory

May 13, 2015

3

Revision 1.0

tcghelp@micrel.com or (408) 955-1690

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