82V3002PVG8 IDT, Integrated Device Technology Inc, 82V3002PVG8 Datasheet - Page 5

• Manufacturer Part Number: 82V3002PVG8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V3002PVG8

• Lead Free Status / Rohs Status: Compliant

IDT82V3002 WAN PLL WITH DUAL REFERENCE INPUTS
FUNCTIONAL DESCRIPTION
timing (clock) and synchronization (framing) signals to interface circuits for
T1 and E1 Primary Rate Digital Transmission links. See the functional
block diagram. The detail is described in the following sections.
STATE CONTROL CIRCUIT
shown in Figure 1, based on the DPLL mode selection inputs MODE_sel0
and MODE_sel1, reference selection input IN_sel, TIE enable input TIE_en
and the result of the Invalid Input Signal Detection, the State Control Circuit
outputs signals to enable/disable the TIE Control Block and control the
work mode of the DPLL Block.
The IDT82V3002 is a WAN PLL with dual reference inputs, providing
The State Control Circuit is an important part in the IDT82V3002. As
Signal Detection
* Note: After reset, the Mode_sel1 and Mode_sel0 should be initially set to '10' or '00'.
Output of the
Invalid Input
Figure 1. State Control Block
IN_sel
Mode_sel1 = 0
Mode_sel0 = 0
Enable/Disable
Normal
TIE Block
S1
TIE_en
State Control Circuit
MODE_sel1
Mode Control
DPLL Block
MODE_sel0
Figure 2. State Control Diagram
(Valid Input Reference Signal)
(Invalid Input Reference Signal)
Short Time Holdover
Auto TIE Enable
F8o
Mode_sel1 = 1
Mode_sel0 = 0
Mode_sel0 = X
Mode_sel1 = 0
Mode_sel0 = 1
Mode_sel1 = 0
Holdover
Freerun
Auto TIE Disable
Reset *
S0
S3
S4
5
Holdover and Freerun. The Mode Select pins MODE_sel1 and MODE_sel0
select the operation mode, see Table 1.
TABLE 1
synchronously on the rising edge of F8o. The three operating modes,
Normal (S1), Holdover (S3) and Freerun (S0) can be switched from one to
another by changing the MODE_sel0 and MODE_sel1 logic levels.
triggered by the Invalid Input Reference Detection Circuit and irrelative to
the logic levels on MODE_sel0 and MODE_sel1 pins. That is, when the
IDT82V3002 is operating in the Normal mode (S1), if an invalid input
reference is detected (input reference is out of the capture range), the
operating mode will be changed automatically from Normal (S1) to Auto-
The IDT82V3002 has three possible modes of operation: Normal,
Figure 2 shows the state control diagram. All state changes occur
The mode changes between Normal (S1) and Auto-Holdover (S2) are
MODE_sel1
0
0
1
1
OPERATING MODES AND STATUS
INDUSTRIAL TEMPERATURE RANGE
MODE_sel0
Auto - Holdover
Mode_sel1 = 0
Mode_sel0 = 0
S2
0
1
0
1
Reserved
Holdover
Freerun
Normal
Mode