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參數(shù)資料
| 型號： | MC74HC646N |
| 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, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大小： | 328K |
| 代理商： | MC74HC646N |
MC54/74HC646
High–Speed CMOS Logic Data
DL129 — Rev 6
3–11
MOTOROLA
VCC
GND
HIGH IMPEDANCE
OUTPUT ENABLE
DIRECTION
DATA PORT A
DATA PORT A
DATA PORT B
DATA PORT B
DATA PORT A = INPUT
DATA PORT B = OUTPUT
DATA PORT A = OUTPUT
DATA PORT B = INPUT
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
1 k
OUTPUT ENABLE
OUTPUT A OR B
OUTPUT A OR B
50%
50%
50%
90%
10%
tPZL
tPLZ
tPZH
tPHZ
VCC
GND
HIGH
IMPEDANCE
VOL
VOH
HIGH
IMPEDANCE
VCC
GND
VOH
HIGH IMPEDANCE
VOL
VOH
HIGH IMPEDANCE
HIGH IMPEDANCE
VOL
Figure 7.
50%
90%
10%
50%
50%
10%
90%
50%
50%
tPHZ
tPLZ
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
Figure 8.
Figure 9. Test Circuit
Figure 10. Test Circuit
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