SM840002 Datasheet, PDF (3/9 Pages) Micrel Semiconductor – ClockWorks™ Dual 10-Gigabit/Gigabit Ethernet 62.5MHz, 125MHz, or 156.25MHz

Micrel, Inc.
SM840002
Pin Description
Pin Number
1
Pin Name
F_SEL0
2
nXTAL_SEL
3
TEST_CLK
4
OE
5
NC
6
nPLL_SEL
7
V_DDA
8
VDD
9
XTAL_OUT
10
XTAL_IN
11
V_DDO
12
Q1
13
Q0
14
GND
15
GND
16
F_SEL1
Type
I
I
I
I
I
P
P
O
I
P
O
O
P
P
I
Level
Pull-Up
Pull-Down
Pull-Down
Pull-Up
Pull-Down
12pF Crystal
12pF Crystal
LVCMOS
LVCMOS
Pull-up
Pin Function
Frequency Select Pin. LVCMOS interface levels.
Selects between XTAL and TEST_CLK Reference Input. When HIGH,
selects TEST_CLK. When LOW, selects XTAL inputs. LVCMOS interface
levels.
Single-Ended LVCMOS Clock Input.
Output Enable. When HIGH, the outputs are active. When LOW, the
outputs are in a high impedance state. LVCMOS interface levels.
No Connect.
Selects between the VCO reference and the VCO Output. When LOW,
the output is driven from the VCO output. When HIGH, the PLL is
bypassed.
2.5V or 3.3V Output Power Supply. No filter resistor needed.
2.5V or 3.3V Output Power Supply.
Crystal Reference Output, no load caps needed.
Crystal Reference Input, no load caps needed.
2.5V or 3.3V Output Power Supply.
Single-Ended Output Clock.
Single-Ended Output Clock.
Ground.
Ground.
Frequency Select Pin. LVCMOS interface levels.
Configuring the SM840002
Xtal Frequency (MHz)
25
25
25
25
F_SEL1
0
0
1
1
F_SEL0
0
1
0
1
M Divider
125
130
130
130
N Divider
20
26
52
26
Output Frequency (MHz)
156.25
125
62.5
125
November 2010
3
M9999-110810
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