DP83848H Datasheet, PDF (58/72 Pages) National Semiconductor (TI) – PHYTER® Mini - Extreme Temperature Single 10/100 Ethernet Transceiver

8.2.2 Reset Timing
Vcc
X1 clock
Hardware
RESET_N
MDC
Latch-In of Hardware
Configuration Pins
Dual Function Pins
Become Enabled As Outputs
T2.2.4
T2.2.1
32 clocks
T2.2.2
T2.2.3
input output
Parameter
Description
Notes
Min
T2.2.1
Post RESET Stabilization time MDIO is pulled high for 32-bit serial man-
prior to MDC preamble for reg- agement initialization
ister accesses
T2.2.2
Hardware Configuration Latch- Hardware Configuration Pins are de-
in Time from the Deassertion scribed in the Pin Description section
of RESET (either soft or hard)
T2.2.3
Hardware Configuration pins
transition to output drivers
T2.2.4
RESET pulse width
X1 Clock must be stable for at min. of 1us 1
during RESET pulse low time.
Typ Max Units
3
µs
3
µs
50
ns
µs
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.
58
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