ACS8520T Semtech, ACS8520T Datasheet - Page 137

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

Table 39 DC Characteristics: LVDS Input/Output Port
Figure 24 Recommended Line Termination for LVDS Input/Output Ports
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
Across all operating conditions, unless otherwise stated
LVDS Input Voltage Range
Differential Input Voltage = 100 mV
LVDS Differential Input Threshold
LVDS Input Differential Voltage
LVDS Input Termination Resistance
Must be placed externally across the LVDS
± input pins of ACS8520. Resistor should
be 100 Ω with 5% tolerance
LVDS Output High Voltage
(Note (i))
LVDS Output Low Voltage
(Note (i))
LVDS Differential Output Voltage
LVDS Change in Magnitude of Differential
Output Voltage for complementary States
(Note (i))
LVDS Output Offset Voltage
Temperature = 25
Note: (i) With 100
n x 8 kHz,
1.544/2.048 MHz,
6.48 MHz,
19.44 MHz,
38.88 MHz,
51.84 MHz,
77.76 MHz or
155.52 MHz
n x 8 kHz,
1.544/2.048 MHz,
6.48 MHz,
19.44 MHz,
38.88 MHz,
51.84 MHz,
77.76 MHz or
155.52 MHz
Parameter
o
C (Note (i))
Ω
load between the differential outputs.
Z
Z
Z
Z
O
O
O
O
= 50Ω
= 50Ω
= 50Ω
= 50Ω
100 Ω
100 Ω
V
V
V
V
Symbol
V
V
V
IDLVTSDS
DOSLVDS
R
OHLVDS
ODLVDS
VRLVDS
V
OLLVDS
OSLVDS
TERM
DITH
I5POS
I5NEG
I6POS
I6NEG
FINAL
Page 137
Minimum
TO6POS
TO6NEG
TO7POS
TO7NEG
0.885
1.125
-100
250
0.1
95
0
-
-
Z
V
n
O
DD
Z
Z
Z
Z
O
O
O
O
= 50Ω
= 50Ω
= 50Ω
= 50Ω
= Transmission line Impedance
= +3.3 V
= integer 1 to 12,500
Typical
100
-
-
-
-
-
-
-
-
100 Ω
100 Ω
ACS8520 SETS
Maximum
1.585
1.275
+100
2.40
105
450
1.4
25
-
Fully
Programmable
Output Frequencies
Fully
Programmable
Output Frequencies
DATASHEET
www.semtech.com
F8530D_025LVDS_06
Units
mV
mV
mV
Ω
V
V
V
V
V