ACS8946 Semtech Corporation, ACS8946 Datasheet - Page 3

• Manufacturer Part Number: ACS8946
• Description: Jitter Attenuating, Multiplying Phase Locked Loop, with Protection Switch, for Oc-12/stm-4 and GbE
• Manufacturer: Semtech Corporation

Figure 2 ACS8946 Pin Diagram
Table 1 Power Pins
Note...A= Analog, I = Input, O = Output, P = Power, LVTTL/LVCMOS
LVTTL/LVCMOS input with pull-down resistor.
Revision 3/November 2006 © Semtech Corp.
Pin Diagram
Pin Description
ADVANCED COMMUNICATIONS
1, 4,
7, 10
26
29
43
34
38
39
49
Pin No.
VDDO1, VDDO2,
VDDO3, VDDO4
VDDADIV
VDDP1
VDDP2
VDDARF
VDDOSC
VSSOSC
VSS0
Symbol
I/O
P
P
P
P
P
P
P
P
Connect large central
pad (Pin 49 VSSO) to GND
Dimensions: 7 mm x 7 mm
Lead Pitch: 0.5 mm
(Leads centered on package)
1
2
3
4
5
6
7
8
9
10 VDDO4
11 OUT4N
12 OUT4P
Type
VDDO1
OUT1N
OUT1P
VDDO2
OUT2N
OUT2P
VDDO3
OUT3N
OUT3P
-
-
-
-
-
-
-
-
Supply Voltage: Independent supplies to power each clock output (differential pair of
pins) OUT1N/P to OUT4N/P respectively. +3.3 Volts ±5%. To disable an output and save
power, tie associated VDD to 0V.
Supply Voltage: Supply for internal Dividers in VCO loop, kept as an isolated supply to
allow for low supply noise for the output divider stages. +3.3 Volts ±5%.
Supply Voltage: Supply to differential inputs, alarm and config. pins. +3.3 Volts ±5%.
Supply Voltage: Supply to Sync input and Sync output pins, rate selection pins, input
selection pins and reset pin. +3.3 Volts ±5%.
Supply Voltage: Supply for phase and frequency detector (PFD), kept as an isolated
supply to allow for low supply noise. +3.3 Volts ±5%.
Supply Voltage: Supply input to the internal VCO. +3.3 Volts +5/-10%.
Supply Ground: 0 V for the internal VCO.
Supply Ground: Common 0 V.
This is the central leadframe pad on the underneath of the package.
FINAL
ACS8946
U
Page 3
= LVTTL/LVCMOS input with pull-up resistor, LVTTL/LVCMOS
Description
36
35
34
33
32
31
30
29
28
27
26
25
F8944_D_002PINDIAG_01
ACS8946 JAM PLL
VCN
VCP
VDDARF
AUTO_SEL
SEL_CLK2
CLK2P
CLK2N
VDDP1
CLK1P
CLK1N
VDDADIV
CFG_IN7
DATASHEET
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D
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