ACS8520T Semtech, ACS8520T Datasheet - Page 6

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

Table 3 Other Pins
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
2
7
8
9
10
18
21
23
24
25
27
28
30
31
34,
35
36,
37
40,
41
42,
43
45
46
47
48
51
52
53
Pin Number
TRST
TMS
INTREQ
TCK
REFCLK
SRCSW
TDO
TDI
I1
I2
TO8NEG
TO8POS
FrSync
MFrSync
TO6POS,
TO6NEG
TO7POS,
TO7NEG
I5POS,
I5NEG
I6POS,
I6NEG
SYNC2K
I3
I4
I7
I8
I9
I10
Symbol
I/O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
LVDS/PECL
PECL/LVDS
LVDS/PECL
PECL/LVDS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
Type
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
AMI
AMI
AMI
AMI
TTL
D
U
D
D
U
D
D
D
D
D
D
D
FINAL
Page 6
JTAG Control Reset Input: TRST = 1 to enable JTAG Boundary Scan
mode. TRST = 0 for Boundary Scan stand-by mode, still allowing correct
device operation. If not used connect to GND or leave floating.
JTAG Test Mode Select: Boundary Scan enable. Sampled on rising edge
of TCK. If not used connect to VDD or leave floating.
Interrupt Request: Active High/Low software Interrupt output.
JTAG Clock: Boundary Scan clock input. If not used connect to GND or
leave floating.
Reference Clock: 12.800 MHz (refer to section headed Local Oscillator
Clock).
Source Switching: Force Fast Source Switching. See “Fast External
Switching Mode-SCRSW Pin” on page 15.
JTAG Output: Serial test data output. Updated on falling edge of TCK. If
not used leave floating.
JTAG Input: Serial test data Input. Sampled on rising edge of TCK. If not
used connect to VDD or leave floating.
Input Reference 1: Composite clock 64 kHz + 8 kHz.
Input Reference 2: Composite clock 64 kHz + 8 kHz.
Output Reference 8: Composite clock, 64 kHz + 8 kHz negative pulse.
Output Reference 8: Composite clock, 64 kHz + 8 kHz positive pulse.
Output Reference 10: 8 kHz Frame Sync output.
Output Reference 11: 2 kHz Multi-Frame Sync output.
Output Reference 6: Programmable, default 38.88 MHz, default type
LVDS.
Output Reference 7: Programmable, default 19.44 MHz, default type
PECL.
Input Reference 5: Programmable, default 19.44 MHz, default type
LVDS.
Input Reference 6: Programmable, default 19.44 MHz, default type
PECL.
External Sync input: 2 kHz, 4 kHz or 8 kHz for frame alignment.
Input Reference 3: Programmable, default 8 kHz.
Input Reference 4: Programmable, default 8 kHz.
Input Reference 7: Programmable, default 19.44 MHz.
Input Reference 8: Programmable, default 19.44 MHz.
Input Reference 9: Programmable, default 19.44 MHz.
Input Reference 10: Programmable, default 19.44 MHz.
Description
ACS8520 SETS
DATASHEET
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