參數(shù)資料
型號(hào)： RTL8208
廠商： Electronic Theatre Controls, Inc.
英文描述： REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER
中文描述： 瑞昱單芯片八路10/100 Mbps快速以太網(wǎng)收發(fā)器
文件頁(yè)數(shù)： 31/40頁(yè)
文件大小： 546K
代理商： RTL8208
RTL8208
2001/01/07
31
Rev.1.923
7.9 2.5V Power Generation
The RTL8208 uses a PNP transistor to generate 2.5V from the 3.3V power supply. This 2.5V provides for digital core and analog
receive circuits. Once your system needs more than one RTL8208 chip (greater than 8 ports), do not use one PNP transistor for
all of the RTL8208 chips even if the rating is enough. Instead, use one transistor for each RTL8208.
Do not connect any beads directly between the collector of PNP transistor and VDDAL. This will affect the stability of the 2.5V
power significantly if the bead exists.
RTL8208
VCTRL
3.3V
VDDAH
VDDAL
VDDAH: 3.3V
VDDAL: 2.5V
2.5V
3.3V
0.1uF
2SB1197K
Ic(max.)=800mA
47uF
Using a PNP Transistor to Produce 2.5V
The power transistor is a 2SB1197K, and follows the following specifications.
Absolute maximum ratings (Ta=25
°
C)
Parameter
Collector-base voltage
Collector-emitter voltage
Emitter-base voltage
Collector current
Collector power dissipation
Junction temperature
Storage temperature
For more information, refer to http://www.rohm.com
Symbol
V
CBO
V
CEO
V
EBO
I
C
P
C
Tj
Tstg
Limits
-40
-32
-5
-0.8
0.2
150
-55~+150
Unit
V
V
V
A(DC)
W
°
C
°
C
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