MTC20154-TQ-C2 ST Microelectronics, Inc., MTC20154-TQ-C2 Datasheet - Page 19

• Manufacturer Part Number: MTC20154-TQ-C2
• Description: Integrated Adsl CMOS Analog Front-end Circuit
• Manufacturer: ST Microelectronics, Inc.

Reset Function
The MTC20154 is placed in reset mode when the RESETN pin is pulled to ground (active low signal). The
system specifications are requiring different behavior of the MTC20154 under reset mode according to the
fact that the MTC20154 is used at the LT or the NT side. The chip status is depicted in the following table:
Table 24. Reset Function (N.B. The reset signal is dominant over the powerdown signal.)
Reset LT side
CLKM pin is replicating the XTALO input clock
(no crystal used at LT side). System clock available
CLKWD is not generated. The pin stays at high level.
Digital blocks are in reset: no activity
Analog blocks are in powerdown
External driver is forced to powerdown
Reset NT side
Crystal driver in power down: no CLKM signal available.
No system clock avail-able.
CLKWD is not generated. The pin stays at high level
Digital blocks are in reset: no activity
Analog blocks are in powerdown
External driver is forced to powerdown
MTC20154
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