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LAN8740 Datasheet(PDF) 118 Page - Microchip Technology

Part # LAN8740
Description  Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR짰 Technology
PDF  136 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8740 Datasheet(HTML) 118 Page - Microchip Technology

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LAN8740A/LAN8740Ai
DS00001987A-page 118
2013-2015 Microchip Technology Inc.
5.6.2
POWER-ON nRST & CONFIGURATION STRAP TIMING
This diagram illustrates the nRST reset and configuration strap timing requirements in relation to power-on. A hardware
reset (nRST assertion) is required following power-up. For proper operation, nRST must be asserted for no less than
trstia. The nRST pin can be asserted at any time, but must not be deasserted before tpurstd after all external power sup-
plies have reached operational levels. In order for valid configuration strap values to be read at power-up, the tcss and
tcsh timing constraints must be followed. Refer to Section 3.8.7, "Resets" for additional information.
Note 1: 20 clock cycles for 25 MHz, or 40 clock cycles for 50 MHz
FIGURE 5-2:
POWER-ON nRST & CONFIGURATION STRAP TIMING
TABLE 5-8:
POWER-ON nRST & CONFIGURATION STRAP TIMING VALUES
Symbol
Description
Min.
Typ.
Max.
Unit
tpurstd
External power supplies at operational level to nRST
deassertion
25
ms
tpurstv
External power supplies at operational level to nRST
valid
0ns
trstia
nRST input assertion time
100
µs
tcss
Configuration strap pins setup to nRST deassertion
200
ns
tcsh
Configuration strap pins hold after nRST deassertion
1
ns
totaa
Output tri-state after nRST assertion
50
ns
todad
Output drive after nRST deassertion
2
800
(see Note 1)
ns
Note:
nRST deassertion must be monotonic.
Note:
Device configuration straps are latched as a result of nRST assertion. Refer to Section 3.7, "Configuration
Straps" for details. Configuration straps must only be pulled high or low and must not be driven as inputs.
tcss
nRST
Configuration Strap
Pins Input
trstia
tcsh
Configuration Strap
Pins Output Drive
todad
All External
Power Supplies
tpurstd
Vopp
tpurstv
totaa



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