82P33724 Datasheet, PDF (8/13 Pages) Integrated Circuit Systems – Differential reference inputs

82P33724 SHORT FORM DATA SHEET
Table 1: Pin Description (Continued)
Pin No.
18
2, 3, 4, 5, 10 11, 12
20, 24, 69, 72
27, 29, 64, 66
40, 62
42, 53
19,23
73 (e_PAD)
58
Name
TDO
VDDA
VDDAO
VDDDO
VDDD
VDDD_1_8
VSSAO
VSS
IC
I/O
O
tri-state
Power
Power
Power
Power
Power
Ground
Ground
-
Type
CMOS
-
-
-
Description
TDO: JTAG Test Data Output
The test data are output on this pin. They are clocked out of the device on the falling edge of
TCK.
TDO pin outputs a high impedance signal except during the process of data scanning.
Power & Ground
VDDA: Analog Core Power - +3.3V DC nominal
VDDAO: Analog Output Power - +3.3V DC nominal
VDDDO: Digital Output Power - +3.3V DC nominal
VDDD: Digital Core Power - +3.3V DC nominal
VDDD_1_8: Digital Core Power - +1.8V DC nominal
VSSAO: Ground
VSS: Ground
Other
IC: Internal Connection
Internal Use. This pin must be left open for normal operation.
2.1 RECOMMENDATIONS FOR UNUSED INPUT
AND OUTPUT PINS
2.1.1
INPUTS
Control Pins
All control pins have internal pull-ups or pull-downs; additional resis-
tance is not required but can be added for additional protection. A 1kΩ
resistor can be used.
Single-Ended Clock Inputs
For protection, unused single-ended clock inputs should be tied to
ground.
Differential Clock Inputs
For applications not requiring the use of a differential input, both
*_POS and *_NEG can be left floating. Though not required, but for
additional protection, a 1kΩ resistor can be tied from _POS to ground.
2.1.2
OUTPUTS
Status Pins
For applications not requiring the use of a status pin, we recommend
bringing out to a test point for debugging purposes.
Single-Ended Clock Outputs
All unused single-ended clock outputs can be left floating, or can be
brought out to a test point for debugging purposes.
Differential Clock Outputs
All unused differential outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output pair
should either be left floating or terminated.
PORT SYNCHRONIZER FOR IEEE 1588 AND
8
SYNCHRONOUS ETHERNET
REVISION 1 09/23/14