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DP83848JSQ bảng dữ liệu(PDF) 63 Page - Texas Instruments

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DP83848JSQ bảng dữ liệu(HTML) 63 Page - Texas Instruments

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62
8.2.2 Reset Timing
Note: It is important to choose pull-up and/or pull-down resistors for each of the hardware configuration pins that provide
fast RC time constants in order to latch-in the proper value prior to the pin transitioning to an output driver.
Vcc
Hardware
RESET_N
MDC
32 clocks
Latch-In of Hardware
Configuration Pins
Dual Function Pins
Become Enabled As Outputs
input
output
T2.2.3
T2.2.2
T2.2.1
X1 clock
T2.2.4
Parameter
Description
Notes
Min
Typ
Max
Units
T2.2.1
Post RESET Stabilization time
prior to MDC preamble for reg-
ister accesses
MDIO is pulled high for 32-bit serial man-
agement initialization
3
µs
T2.2.2
Hardware Configuration Latch-
in Time from the Deassertion
of RESET (either soft or hard)
Hardware Configuration Pins are de-
scribed in the Pin Description section
3
µs
T2.2.3
Hardware Configuration pins
transition to output drivers
50
ns
T2.2.4
RESET pulse width
X1 Clock must be stable for at min. of 1us
during RESET pulse low time.
1
µs



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