ACS8520T Semtech, ACS8520T Datasheet - Page 145

• Manufacturer Part Number: ACS8520T
• Description: Synchronous Equipment Timing Source (SETS) for Stratum 3/4E/4 and SMC Systems
• Manufacturer: Semtech

Figure 31 Simplified Application Schematic
Revision 3.02/October 2005 © Semtech Corp.
Application Information
ADVANCED COMMUNICATIONS
term_connect
Decoupling capacitor, C21 should be placed close to the xtal
pins that are being decoupled
CC parts are easily cut links that can also take SM
capacitors or Ohm resistor links.
All tcxo options to be placed as close as possible to IC1,
with short output track.
5v
0v
P1
BZV90C-5.6v
ZD1
VDD5v
(+)
100uF
C2
T1
100nF
C21
C3
EZ1086CT-3.3
100nF
VDD
DGND
Pe-68865
C23
R38
optn
optn
C22
IC2
DGND2
100n
VIN
1
GND
10uF_TANT
3
R41
optn
2
3
12.8MHz
O1
O2
O3
O4
O5
O9
DGND
Vectron
vdd
gnd1
txco
VOUT
O8P
2
C4
X1
VDD
(+)
DGND
10uF_TANT
5
4
1
output
gnd2
optn
470nF
C16
I1
DGND
C5
100nF
VDDA
C7
VDDA
AGND
470nF
(+)
I2
C17
AGND
DGND2
VDD2
10R
10R
R1
R6
DGND2
DGND3
100nF
DGND3
100nF
VDD2
VDD3
VDDA
AGND
100nF
C11
100nF
C12
C10
C6
VDD3
Power supply and ground
connections to 'star'
connect back to these
decoupling capacitors at
the regulator and only
connect together at this
point
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
AGND
1
2
3
4
5
6
7
8
9
VDDA
AGND
TRST
IC1
IC2
AGND1
VA1+
TMS
INTREQ
TCK
REFCLK
DGND1
VD1+
VD3+
DGND3
DGND2
VD2+
IC3
SRCSW
VA2+
AGND2
TDO
IC4
TDI
I1
I2
FINAL
Page 145
DGND2
100nF
VDD2
C29
100nF
C15
ACS8520
IC1
DGND2
SrSwit
100nF
C9
VDD2
100nF
C32
Optional Processor/EPROM
interface type selection
VDD
Int
DGND
UPSEL0 60
UPSEL1 59
UPSEL2 58
DGNDd 62
DGND
VDD
PORB 74
VDDd 61
WRB 71
RDY 75
RDB 72
CSB 70
ALE 73
I14 57
I13 56
I12 55
I11 54
I10 53
C14
100nF
A0 69
A1 68
A2 67
A3 66
A4 65
A5 64
A6 63
I9 52
I8 51
I3
RDY
I4
ALE
RDB
I7
WRB
I8
CSB
I9
DGND
C8
I10
1nF
ACS8520 SETS
Optional EPROM interface
selection
I11
I12
I13
VDD
100nF
DGND
C13
I14
DGND
All decoupling capacitors, C29,
C9, C13, C14, C15, C6, C5,
C12, C11, C10,C32 should be
placed close to the IC1 pins that
are being decoupled
DATASHEET
www.semtech.com
UPSEL0
UPSEL1
UPSEL2
F8520D_031EvalBdSchem_01
Optional
Processor
interface type
selection