Micrel, Inc.
DSC2011FE2-F0016
Operational Description
The DSC2011FE2-F0016 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
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.
dividers from the output of the internal PLL. The two
constraints are imposed on the output frequencies:
1) f2 = M x f1/N, where M and N are even integers
between 4 and 254, 2) 1.2GHz < N x f2 < 1.7GHz.
The actual frequencies output by DSC2011FE2-F0016
are controlled by an internal pre-programmed memory
(OTP). This memory stores all coefficients required by
the PLL for up to eight different frequency combinations.
Three control pins (FS0 - FS2) select the output frequency
combination.
When OE (pin 1) is floated or connected to VDD, the
DSC2011FE2-F0016 is in operational mode. Driving
Enable to ground will tri-state both output drivers
(hi-impedance mode).
DSC2011FE2-F0016 has programmable output drive
strength for each output. Using two control pins (OXS0-
OXS1) for each output, the drive strength can be indepen-
dently adjusted to match circuit board impedances to
reduce spower supply noise, overshoot/undershoot and
EMI. Table 1 displays typical rise / fall times for the
output with a 15pF load capacitance as a function of
these control pins at VDD = 3.3V and room temperature.
DSC2011FE2-F0016 has independent control of the output
voltage levels of the two outputs. The high voltage level of
Output Drive Strength Bits [OXS1, OXS0] - Default is [11]
00
1.6
2.4
01
1.4
2.2
10
1.2
1.5
11
1.1
1.4
tr (ns)
tf (ns)
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 [111] and the device will output the
associated frequency highlighted in bold.
Freq Select Bits [FS2, FS1, FS0] - Default is [111]
Freq (MHz)
000
001
NA
NA
010
NA
NA
011
NA
NA
100
NA
NA
101
NA
NA
110
NA
NA
111
25
CLK1
CLK2
25
50
50
Table 2. Pin-Selectable Output Frequencies
Absolute Maximum Ratings
Item
Min.
-0.3
-0.3
-
Max.
+4.0
Units
V
Condition
Supply Voltage
Input Voltage
Junction Temp
Storage Temp
Soldering Temp
VDD + 0.3
+150
V
°C
°C
°C
-55
-
+150
+260
40sec max.
ESD
HBM
MM
4000
400
-
V
CDM
1500
1000+ years of data retention on internal memory
April 12, 2015
2898
3
Revision 1.0
tcghelp@micrel.comor (408) 955-1690
MICREL [ MICREL SEMICONDUCTOR ]
