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參數(shù)資料
| 型號： | ET80960JT10016 |
| 廠商： | Intel |
| 文件頁數(shù)： | 31/86頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MPU I960JT 3V 100MHZ 132-QFP |
| 標準包裝： | 1 |
| 處理器類型： | i960 |
| 特點： | 后綴 JT，32 位 16K 高速緩沖 |
| 速度： | 100MHz |
| 電壓： | 3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 132-QFP |
| 供應(yīng)商設(shè)備封裝： | 132-QFP |
| 包裝： | 托盤 |
| 其它名稱： | 864017 |
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80960JA/JF/JD/JS/JC/JT 3.3 V Embedded 32-Bit Microprocessor
Datasheet
37
When the regulator cannot prevent the 2.25 V differential, the addition of the resistor is a simple
and reliable method for limiting current. The resistor may also prevent damage in the case of a
power failure, where the 5 V supply remains on and the 3.3 V supply goes to zero.
4.5
VCCPLL Pin Requirements
To reduce clock skew on the 80960Jx processor, the VCCPLL pin for the Phase Lock Loop (PLL)
circuit is isolated on the pinout. The lowpass filter, as shown in Figure 9, reduces noise induced
clock jitter and its effects on timing relationships in system designs. The 4.7 F capacitor must be
low ESR solid tantalum; the 0.01 F capacitor must be of the type X7R and the node connecting
VCCPLL must be as short as possible.
When the voltage on the VCCPLL power supply pin exceeds the VCC pin voltage by 0.5 V at any
time, including the power up and power down sequences, excessive currents may permanently
damage on-chip electrostatic discharge (ESD) protection diodes. The damage may accumulate over
multiple episodes.
In actual applications, this problem occurs only when the VCCPLL and VCC pins are driven by
separate power supplies or voltage regulators. Applications that use one power supply for
VCCPLL and VCC are not typically at risk. Verify that your application does not allow the
VCCPLL voltage to exceed VCC by 0.5 V.
The VCCPLL low-pass filter recommendation does not promote this problem.
Table 19. VDIFF Parameters
Symbol
Parameter
Min
Max
Units
Notes
VDIFF
VCC5-VCC
Difference
2.25
V
VCC5 input should not exceed VCC by more than 2.25 V
during power-up and power-down, or during steady-
state operation.
Figure 9. VCCPLL Lowpass Filter
100
VCC
(Board Plane)
VCCPLL
(On 80960Jx)
(80960JA/JF/JD)
F_CA078A
0.01 F
4.7 F
+
10
(80960JS/JC/JT)
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