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參數資料
| 型號： | MC74HC646DW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Octal 3-State Bus Transeceivers and D Flip-Flops |
| 中文描述： | HC/UH SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOIC-24 |
| 文件頁數： | 9/14頁 |
| 文件大小： | 328K |
| 代理商： | MC74HC646DW |
MC54/74HC646
High–Speed CMOS Logic Data
DL129 — Rev 6
3–9
MOTOROLA
B DATA PORT
A DATA PORT
OUTPUT ENABLE
DIRECTION
INTERNAL QA
(FLIP–FLOP A)
INTERNAL QB
(FLIP–FLOP B)
B–TO–A
SOURCE
A–TO–B
SOURCE
VCC
GND
NOTES:
1. B Data Port (output) changes from the level of the storage flip–flop, QA, to the level of A Data Port (input).
2. B Data Port (output) changes from the level of the A Data Port (input) to the level of the storage flip–flop, QA.
3. The A storage flip–flop, A–to–B Source, and A Data Port (input) have simultaneously changed states.
Figure 5. A Data Port = Input, B Data Port = Output
1
2
3
VCC
GND
VCC
GND
VCC
GND
VCC
GND
VCC
GND
VCC
GND
50%
tPLH
tPHL
50%
tPLH
tPHL
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