參數(shù)資料
型號： LXT9880HC
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 30/96頁
文件大?。?/td> 1309K
代理商： LXT9880HC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
30
Datasheet
2.1.6
LED Drivers
The LXT980 provides 23 LED drivers:
3 mode-selectable port LED drivers (15 total)
2 segment LED drivers (4 total)
4 global LED drivers
Refer to
Table 8 on page 16
for LED Interface pin assignments and signal descriptions.
2.2
Requirements
2.2.1
Power
The LXT980 has four types of +5V power supply input pins (VCC, VCCV, VCCR, and VCCT).
These inputs may be supplied from a single power supply, although ferrites should be used to filter
the power going to the analog and digital power planes. As a matter of good practice, these supplies
should be as clean as possible. Specific operating recommendations are shown in the Test
Specifications section,
Table 25 on page 59
.
Each supply input should be decoupled to its respective ground. Refer to
Table 9 on page 17
for
power and ground pin assignments, and to
“
Design Recommendations
”
on page 48
.
2.2.2
Clock
A stable, external 25 MHz system clock source (CMOS) is required by the LXT980. This is
connected to the CLK25 pin. Refer to Test Specifications,
Table 26 on page 59
, for clock input
requirements.
2.2.3
Bias Resistor
The LXT980 requires a 22.1 k
, 1% resistor connecting its RBIAS input to ground.
2.2.4
Reset
At power-up, the reset input must be held low until VCC reaches at least 4.5V. An
‘
LS14 or
equivalent should be used to drive reset if there are multiple LXT980 devices (See
Figure 25 on
page 58
).
2.2.5
PROM
An external, auto-incrementing 48-bit PROM can be used for two purposes:
to assign a unique ID to all LXT980s on a board
to support the EPROM-based address arbitration mechanism on the Serial Management
Interface (refer to
page 44
)
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