Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

Preview PDF HTML

LAN8742Ai-CZ Folha de dados(PDF) 34 Page - Microchip Technology

Nome de Peças LAN8742Ai-CZ
Descrição Electrónicos  Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR짰 Technology
PDF  124 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8742Ai-CZ Folha de dados(HTML) 34 Page - Microchip Technology

Back Button LAN8742Ai-CZ Datasheet HTML 30Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 31Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 32Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 33Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 34Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 35Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 36Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 37Page - Microchip Technology LAN8742Ai-CZ Datasheet HTML 38Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 34 / 124 page
background image
LAN8742A/LAN8742Ai
DS00001989A-page 34
 2013-2015 Microchip Technology Inc.
3.7.4.2
REF_CLK Out Mode
To reduce BOM cost, the device includes a feature to generate the RMII REF_CLK signal from a low-cost, 25 MHz fun-
damental crystal. This type of crystal is inexpensive in comparison to 3rd overtone crystals that would normally be
required for 50 MHz. The MAC must be capable of operating with an external clock to take advantage of this feature as
shown in Figure 3-8.
In order to optimize package size and cost, the REFCLKO pin is multiplexed with the nINT pin. In REF_CLK Out mode,
the nINT functionality is disabled to accommodate usage of REFCLKO as a 50 MHz clock to the MAC.
Note:
The REF_CLK Out Mode is not part of the RMII Specification. To ensure proper system operation, a timing
analysis of the MAC and LAN8742A/LAN8742Ai must be performed.
Note:
In REF_CLK Out Mode, REFCLKO will not output when the device is in Energy Detect Power-Down Mode
or General Power-Down Mode.
FIGURE 3-8:
SOURCING REF_CLK FROM A 25 MHZ CRYSTAL
LAN8742A/LAN8742Ai
10/100 PHY
24-VQFN
RMII
TXP
TXN
Mag
RJ45
RXP
RXN
25 MHz
XTAL1/CLKIN
XTAL2
LED[2:1]
2
Interface
nRST
TXD[1:0]
2
RXD[1:0]
CRS_DV
2
RMII
MDIO
MDC
TXEN
REFCLKO
MAC
Capable of
accepting 50 MHz
clock
Note: nINT not available in
this configuration
RXER
REF_CLK



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100  ...More


Folha de dados Download

Go To PDF Page


Ligação URL



ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   Link para a ficha técnica    |   roca de Link   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com