GS2970 Datasheet, PDF (139/145 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

4.23 Device Power-up
Because the GS2970 is designed to operate in a multi-voltage environment, any
power-up sequence is allowed. The charge pump, phase detector, core logic, serial
digital output and I/O buffers can all be powered up in any order.
4.24 Device Reset
NOTE: At power-up, the device must be reset to operate correctly.
In order to initialize all internal operating conditions to their default states, hold the
RESET_TRST signal LOW for a minimum of t_reset = 10ms after all power supplies are
stable. There are no requirements for power supply sequencing.
When held in reset, all device outputs are driven to a high-impedance state.
Nominal Level
95% of Nominal Level
Supply Voltage
RESET_TRST
Figure 4-53: Reset Pulse
treset
Reset
treset
Reset
4.25 Standby Mode
The STANDBY pin reduces power to a minimum by disabling all circuits except for the
register configuration. Upon removal of the signal to the STANDBY pin, the device
returns to its previous operating condition within 1 second, without requiring input
from the host interface.
GS2970 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Audio and Video Processing
Data Sheet
47478 - 4
September 2012
139 of 145