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參數資料
| 型號： | VK501A |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 8-BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1-BIT BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3-STATE OUTPUTS |
| 中文描述： | 8位通用總線收發(fā)器和兩個1位總線收發(fā)器與劈開LVTTL港口，反饋路徑，以及三態(tài)輸出 |
| 文件頁數： | 3/30頁 |
| 文件大小： | 568K |
| 代理商： | VK501A |
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SCES620 – DECEMBER 2004
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional description
The SN74VMEH22501A is a high-drive (–48/64 mA), 8-bit UBT transceiver containing D-type latches and
D-type flip-flops for data-path operation in transparent, latched, or flip-flop modes. Data transmission is true
logic. The device is uniquely partitioned as 8-bit UBT transceivers with two integrated 1-bit three-wire bus
transceivers.
functional description for two 1-bit bus transceivers
The OEAB inputs control the activity of the 1B or 2B port. When OEAB is high, the B-port outputs are active.
When OEAB is low, the B-port outputs are disabled.
Separate 1A and 2A inputs and 1Y and 2Y outputs provide a feedback path for control and diagnostics
monitoring. The OEBY inputs control the 1Y or 2Y outputs. When OEBY is low, the Y outputs are active. When
OEBY is high, the Y outputs are disabled.
The OEBY and OEAB inputs can be tied together to form a simple direction control where an input high yields
A data to B bus and an input low yields B data to Y bus.
1-BIT BUS TRANSCEIVER FUNCTION TABLE
INPUTS
OUTPUT
MODE
OEAB
OEBY
L
H
Z
Isolation
H
H
A data to B bus
True driver
L
L
B data to Y bus
H
L
A data to B bus, B data to Y bus
True driver with feedback path
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