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| 型號： | 101-0383 |
| 廠商： | Rabbit Semiconductor |
| 文件頁數(shù)： | 49/80頁 |
| 文件大?。?/td> | 0K |
| 描述： | MODULE RABBITCORE RCM2020 |
| 標準包裝： | 1 |
| 系列： | RabbitCore® |
| 模塊/板類型： | MPU 核心模塊 |
| 適用于相關(guān)產(chǎn)品： | RCM2020 |
| 其它名稱： | 316-1010 |
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User’s Manual
49
A.4 I/O Buffer Sourcing and Sinking Limit
Unless otherwise specified, the Rabbit I/O buffers are capable of sourcing and sinking 8 mA
of current per pin at full AC switching speed. Full AC switching assumes a 25.8 MHz
CPU clock and capacitive loading on address and data lines of less than 100 pF per pin.
Address pin A0 and data pin D0 are rated at 16 mA each. Pins A1–A12 and D1–D7 are
each rated at 8 mA. The absolute maximum operating voltage on all I/O is VDD + 0.5 V, or
5.5 V.
Table A-5 shows the AC and DC output drive limits of the parallel I/O buffers when the
Rabbit 2000 is used in the RabbitCore 2000.
Some of the values listed are different from those listed in the Rabbit 2000 Microproces-
sor User’s Manual to take into account external loading of the Rabbit 2000 while it is part
of the RCM2000. Loads that exceed the values listed above need to be buffered.
Table A-5. I/O Buffer Sourcing and Sinking Capability
Pin Name
Output Drive
Sourcing*/Sinking Limits
(mA)
*
The maximum DC sourcing current for I/O buffers between VDD pins is
112 mA.
The maximum DC sinking current for I/O buffers between VSS pins is
150 mA.
Output Port Name
Full AC Switching
SRC/SNK
Maximum DC Output
Drive
SRC/SNK
The maximum DC output drive on I/O buffers must be adjusted to take
into consideration the current demands made my AC switching outputs,
capacitive loading on switching outputs, and switching voltage.
The current drawn by all switching and nonswitching I/O must not
exceed the limits specified in the first two footnotes.
PA [7:0]
8/8
12/12
PB [7, 1, 0]
8/8
12/12
PC [6, 4, 2, 0]
8/8
12/12
PD [7:4]
8/8
12/12
PD [3:0]**
** The combined sourcing from Port D [7:0] may need to be adjusted so as
not to exceed the 112 mA sourcing limit requirement specified in the first
footnote.
16/16
12/25
PE [7:0]
8/8
12/12
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