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LAN8740 Datasheet(PDF) 123 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) 123 Page - Microchip Technology

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2013-2015 Microchip Technology Inc.
DS00001987A-page 123
LAN8740A/LAN8740Ai
5.6.4.1
RMII CLKIN Requirements
5.6.5
SMI TIMING
This section specifies the SMI timing of the device. Please refer to Section 3.5, "Serial Management Interface (SMI)" for
additional details.
TABLE 5-13:
RMII CLKIN (REF_CLK) TIMING VALUES
Parameter
Min.
Typ.
Max.
Unit
Note
CLKIN frequency
50
MHz
CLKIN Frequency Drift
±50
ppm
CLKIN Duty Cycle
40
60
%
CLKIN Jitter
150
ps
p-p – not RMS
FIGURE 5-7:
SMI TIMING
TABLE 5-14:
SMI TIMING VALUES
Symbol
Description
Min.
Max.
Unit
tclkp
MDC period
400
ns
tclkh
MDC high time
160 (80%)
ns
tclkl
MDC low time
160 (80%)
ns
tval
MDIO (read from PHY) output valid from rising edge of MDC
300
ns
toinvld
MDIO (read from PHY) output invalid from rising edge of MDC
0
ns
tsu
MDIO (write to PHY) setup time to rising edge of MDC
10
ns
tihold
MDIO (write to PHY) input hold time after rising edge of MDC
10
ns
MDC
MDIO
tclkh
tclkl
tclkp
toinvld
MDIO
tsu tihold
(Data-Out)
(Data-In)
toinvld
tval
(INPUT)



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