參數(shù)資料
型號: MT8LLN22NCNE
元件分類: 總線控制器
英文描述: PCI BUS CONTROLLER, PBGA316
封裝: 27 X 27 MM, PLASTIC, BGA-316
文件頁數(shù): 57/145頁
文件大?。?/td> 2285K
代理商: MT8LLN22NCNE
Coppertail Product Specification
MT8LLN22NCNE.fm – Rev. 1, Pub. 2/02
19
2002, Micron Technology Inc.
PRELIMINARY
MT8LLN22NCNE
COPPERTAIL
External RTC Circuitry
The RTC requires a battery voltage in the range of
1.7 to 2.8 VDC for proper operation when the I/O Con-
troller is not powered by the system. This is achieved
by using the circuit in Figure 4. The voltage on 2VBAT
is for the VBAT pin on the I/O Controller while the volt-
age 3VBAT is for all other onboard devices, which
require a battery voltage of 3.0 VDC. Diodes D1 and D2
are required to provide the necessary voltage drop to
meet the targeted voltage range. Diode D3 is a dual
Schottky diode which servers as an isolation device.
This diode will allow the RTC to be powered by the bat-
tery when the system power is removed while allowing
it to be powered by the system power when it is avail-
able. This is accomplished by reverse-biasing the top
diode of D3 when the system power is not present.
Figure 4
RTC Diode Battery Circuit
Power Signals
SIGNAL
TYPE
POWER
PLANE
DESCRIPTION
VAUX_AVDD
[3:0]
I
Standby Power for the standby plane (2.5V).
VBAT
I
Battery
Input from external 3-volt battery backup for internal real-time clock.
Powered off of the battery plane (2.8V to 1.7V at the VBAT pin).
VDD2.5
I
VDD2.5
2.5V Core power.
VDD3.3
I
VDD3.3
3.3V Core power.
VSS
I
Ground
Integrated Pull-up and Pull-down Resistors
SIGNAL
INTEGRATED RESISTOR VALUE
PULL-UP/PULL-DOWN
T_IDDT
14K
Pull-up.
T_TN
12K
Pull-down.
P_GNT_1#
5K
Pull-down.
3.0 V
Battery
Dual
Schottky Diode
Small Signal
Switching Diode
(ex: BAL99LT1)
Small Signal Dual
Switching Diode
(ex: BAV99WT1)
D1
D2
D3
2VBAT
3VSB
(1.7 - 2.8 VDC)
D4
3VBAT
(1.8 - 3.3 VDC)
1K , 5%
R1
3VSB
Dual
Schottky Diode
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