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LAN9250 Datasheet(PDF) 410 Page - Microchip Technology

Part # LAN9250
Description  Integrated Ethernet PHY with HP Auto-MDIX
PDF  421 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9250 Datasheet(HTML) 410 Page - Microchip Technology

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LAN9250
DS00001913A-page 410
 2015 Microchip Technology Inc.
19.6.3
RESET AND CONFIGURATION STRAP TIMING
This diagram illustrates the RST# pin timing requirements and its relation to the configuration strap pins and output
drive. Assertion of RST# is not a requirement. However, if used, it must be asserted for the minimum period specified.
The RST# pin can be asserted at any time, but must not be deasserted until tpurstd after all external power supplies have
reached operational levels. Refer to Section 6.2, "Resets," on page 38 for additional information.
Note:
The clock input must be stable prior to RST# deassertion.
Note:
Device configuration straps are latched as a result of RST# assertion. Refer to Section 6.2.1, "Chip-Level
Resets," on page 39 for details.
Note:
Configuration strap latching and output drive timings shown assume that the Power-On reset has finished
first otherwise the timings in Section 19.6.4, "Power-On and Configuration Strap Timing" apply.
FIGURE 19-4:
RST# PIN CONFIGURATION STRAP LATCHING TIMING
TABLE 19-11: RST# PIN CONFIGURATION STRAP LATCHING TIMING VALUES
Symbol
Description
Min
Typ
Max
Units
tpurstd
External power supplies at operational level to RST# deasser-
tion
25
ms
trstia
RST# input assertion time
200
-
-
s
tcss
Configuration strap pins setup to RST# deassertion
200
-
-
ns
tcsh
Configuration strap pins hold after RST# deassertion
10
-
-
ns
todad
Output drive after deassertion
3
-
-
us
tcss
RST#
Configuration
Strap Pins
trstia
tcsh
Output Drive
todad

All External
Power Supplies
tpurstd
Vopp



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