ACS8520T Semtech, ACS8520T Datasheet - Page 136

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

Table 38 DC Characteristics: PECL Input/Output Port (cont...)
Notes: (i) Unused differential input ports should be left floating and set in LVDS mode, or the positive and negative inputs tied to V
Figure 23 Recommended Line Termination for PECL Input/Output Ports
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
Across all operating conditions, unless otherwise stated
PECL Input High Voltage
Single-ended Input (Note iii)
Input High Current
Input Differential Voltage V
Input Low Current
Input Differential Voltage V
PECL Output Low Voltage (Note iv)
PECL Output High Voltage (Note iv)
PECL Output Differential Voltage (Note iv)
(iii) Unused differential input terminated to V
(iv) With 50
(ii) Assuming a differential input voltage of at least 100 mV.
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
respectively.
Parameter
Ω
load on each pin to V
Z
Z
Z
Z
ID
ID
O
O
O
O
= 50Ω
= 50Ω
= 50Ω
= 50Ω
= 1.4V
= 1.4V
130 Ω
130 Ω
82 Ω
82 Ω
DD
-2 V, i.e. 82
V
V
V
GND
GND
Symbol
V
V
DD
DD
V
I
ILPECL_S
I
IHPECL
OLPECL
OHPECL
ODPECL
ILPECL
DD
130 Ω
130 Ω
82 Ω
82 Ω
-1.4 V.
Ω
to GND and 130
I5POS
I5NEG
I6POS
I6NEG
Z
V
n
O
DD
= Transmission line Impedance
= +3.3 V
= Integer 1 to 12,500
FINAL
Page 136
Minimum
V
V
TO6POS
TO6NEG
TO7POS
TO7NEG
V
DD
DD
DD
580
-10
-10
-2.10
-1.25
-1.3
Ω
to V
Z
Z
Z
Z
O
O
O
O
= 50Ω
= 50Ω
= 50Ω
= 50Ω
DD
.
Typical
130 Ω
130 Ω
82 Ω
82 Ω
-
-
-
-
-
-
V
V
GND
GND
DD
DD
130 Ω
82 Ω
130 Ω
82 Ω
Maximum
ACS8520 SETS
V
V
V
DD
DD
DD
+10
+10
900
-1.62
-0.88
-0.5
Fully
Programmable
Output Frequencies
Fully
Programmable
Output Frequencies
F8530D_024PECL_06
DATASHEET
www.semtech.com
DD
Units
mV
µA
µA
V
V
V
and GND