ACS8520 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8520' PDF : 150 Pages View PDF
ACS8520 SETS
ADVANCED COMMUNICATIONS
FINAL
Table 38 DC Characteristics: PECL Input/Output Port (cont...)
Across all operating conditions, unless otherwise stated
Parameter
Symbol
Minimum
PECL Input High Voltage
Single-ended Input (Note iii)
VILPECL_S
VDD-1.3
Input High Current
Input Differential Voltage VID = 1.4V
Input Low Current
Input Differential Voltage VID = 1.4V
PECL Output Low Voltage (Note iv)
PECL Output High Voltage (Note iv)
PECL Output Differential Voltage (Note iv)
IIHPECL
IILPECL
VOLPECL
VOHPECL
VODPECL
-10
-10
VDD-2.10
VDD-1.25
580
Typical
-
-
-
-
-
-
DATASHEET
Maximum
VDD-0.5
+10
+10
VDD-1.62
VDD-0.88
900
Units
V
µA
µA
V
V
mV
Notes: (i) Unused differential input ports should be left floating and set in LVDS mode, or the positive and negative inputs tied to VDD and GND
respectively.
(ii) Assuming a differential input voltage of at least 100 mV.
(iii) Unused differential input terminated to VDD -1.4 V.
(iv) With 50 Ω load on each pin to VDD -2 V, i.e. 82 Ω to GND and 130 Ω to VDD.
Figure 23 Recommended Line Termination for PECL Input/Output Ports
VDD
n x 8 kHz,
1.544/2.048
MHz,
ZO =
50Ω
130 Ω
6.48 MHz,
19.44 MHz,
38.88 MHz,
51.84 MHz,
82 Ω
ZO = 50Ω
77.76 MHz or
155.52 MHz
I5POS TO6POS
130 Ω
I5NEG TO6NEG
82Ω
130 Ω
ZO = 50Ω
82 Ω
ZO = 50Ω
VDD
130 Ω
Fully
Programmable
Output Frequencies
82Ω
n x 8 kHz,
1.544/2.048
MHz,
ZO =
50Ω
130 Ω
6.48 MHz,
19.44 MHz,
38.88 MHz,
51.84 MHz,
82 Ω
ZO = 50Ω
77.76 MHz or
155.52 MHz
GND
VDD
I6POS TO7POS
130 Ω
ZO = 50Ω
130 Ω
I6NEG TO7NEG
82Ω
ZO = 50Ω
82Ω
ZO = Transmission line Impedance
VDD = +3.3 V
GND
n = Integer 1 to 12,500
GND
VDD
130 Ω
Fully
Programmable
Output Frequencies
82Ω
GND
F8530D_024PECL_06
Revision 3.02/October 2005 © Semtech Corp.
Page 136
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