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| 型号： | 78Q2123/F |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/38页 |
| 文件大小： | 0K |
| 描述： | TXRX 10/100 MDIX 3.3V COMM 32QFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 490 |
| 类型： | PHY 收发器 |
| 驱动器/接收器数： | 4/4 |
| 规程： | IEEE 802 |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
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78Q2123/78Q2133 Data Sheet
DS_21x3_001
10
Rev. 1.6
1.6
Additional Features
1.6.1
LED Indicators
There are two LED pins that can be used to indicate various states of operation of the
78Q2123/78Q2133. The function of these pins is programmable via the MR23 register as shown in the
table below:
LED State Indication
0
1 = Link OK (Default LED0)
1
1 = RX or TX Activity (Default LED1)
2
1 = TX Activity
3
1 = RX Activity
4
1 = Collision
5
1 = 100 BASE-TX mode
6
1 = 10 BASE-T mode
7
1 = Full Duplex
8
1= Link OK & Blink = RX or TX Activity
The default status of these LEDs are “Link OK” for LED0 and “RX or TX Activity” for LED1.
1.6.2
Interrupt Pin
The 78Q2123 and 78Q2133 have an Interrupt pin (INTR) that is asserted whenever any of the eight
interrupt bits of MR17.7:0 are set. These interrupt bits can be disabled via the MR17.15:8 Interrupt
Enable bits. The Interrupt Polarity bit, MR16.14, controls the active level of the INTR pin. When the INTR
pin is not asserted, the pin is held in a high impedance state. An external pull-up or pull-down resistor may
be required for use with the INTR pin.
1.6.3
Automatic MDI/ MDI-X Configuration
The 78Q2123 and 78Q2133 implement the automatic MDI/MDI-X configuration detailed in IEEE-802.3
2002. This function eliminates the need for cross over cables when connecting to another device. When
auto-switching is enabled, the 78Q2123/78Q2133 will attempt to detect activity on its given configuration.
If no activity is seen for 60 ms, the device will switch to the other configuration depending on a random
number sequence. The initial seed of the random number generator can be set via MR24.3:0. In
addition, the part includes an asynchronous MDIX reset that varies from 1.29 seconds to 1.57 seconds to
ensure lock step will not occur between two devices.
The 78Q2123 and 78Q2133 will also allow for auto-switching while the part is not in auto-negotiation
mode. The IEEE 802.3 specification will not work in this case if the other device is in auto-negotiation
mode. The 78Q2123 and 78Q2133 default to auto MDIX enabled with parallel detection. Register bits
MR24.6 and MR24.7 are both defaulted to 1. The 78Q2123 and 78Q2133 will resolve the proper
configuration within 5 seconds.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 78Q2123R/F | 功能描述:以太网 IC 10/100 Fast Ethernet MicroPHY RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| 78Q2123R/F1 | 功能描述:以太网 IC RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| 78Q2123S/F | 功能描述:1/1 Transceiver Full Ethernet 16-TQFN (5x5) 制造商:maxim integrated 系列:MicroPHY?? 包装:管件 零件状态:有效 类型:收发器 协议:以太网 驱动器/接收器数:1/1 双工:全 接收器滞后:- 数据速率:- 电压 - 电源:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商器件封装:16-TQFN（5x5） 标准包装:60 |
| 78Q2123SR/F | 功能描述:1/1 Transceiver Full Ethernet 16-TQFN (5x5) 制造商:maxim integrated 系列:MicroPHY?? 包装:带卷（TR） 零件状态:有效 类型:收发器 协议:以太网 驱动器/接收器数:1/1 双工:全 接收器滞后:- 数据速率:- 电压 - 电源:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商器件封装:16-TQFN（5x5） 标准包装:2,500 |
| 78Q2132 | 制造商:TDK 制造商全称:TDK Electronics 功能描述:1/10BASE-T HomePNA/Ethernet Transceiver |
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