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參數(shù)資料
| 型號： | LC897127K |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP144 |
| 封裝： | SQFP-144 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 79K |
| 代理商： | LC897127K |
No. 6251-3/14
LC897127K
SCSI Pin Input Characteristics
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Input threshold voltage
Vt+t1
VDD = 4.50 to 5.50 V
1.60
2.00
V
Vt–t1
0.80
1.10
V
Hysteresis width
Vtt1
VDD = 5.0 V
0.41
0.5
V
Active Low Output Characteristics
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Output high-level voltage
VOH
2.5
V
Output low-level voltage
VOL
0.4
V
Note: Only applies to the active-low output pins DB0 to DB7, REQ, and DBPB
Rise Time Test Circuit
SCSI
Driver
TP
47
±5%
15pF
±5%
2.5V
+
–
A12548
Recommended Oscillator and PLL Circuits
LC897127
R1
R2
C2
C1
XTALCK0
PN27
XTAL0
PN28
PN69
PN70
PN71
A12549
LC897127
PLL
R5
R4
C3
R3
A12550
R1 = 120 k
, R2 = 47 , C1 = 30 pF
Crystal element oscillator frequency XTALCK0 = 16.9344 MHz
R3 = 7.5 k
, R4 = 200 , R5 = 10k , C3 = 0.1 F
Note: The values listed above for R3, R4, R5, and C3 also apply when the XTALKC0 frequency is 33.8688 MHz.
Applications must be designed so that the analog VDD and VSS power supply system is completely independent of the
logic system power supply and is not affected by the logic system power supply in any way.
Since the exact values of these components will vary depending on characteristics of the printed circuit board used and
other factors, consult the manufacturer of the crystal element when designing the oscillator circuit.
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