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參數資料
| 型號： | MC44251FU |
| 廠商： | MOTOROLA INC |
| 元件分類： | ADC |
| 英文描述： | Triple 8-Bit Video ADC Three-State Outputs |
| 中文描述： | TRIPLE 1-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數： | 4/18頁 |
| 文件大小： | 273K |
| 代理商： | MC44251FU |
MC44251
4
MOTOROLA
DATA OUTPUTS
Symbol
Characteristic
Min
Max
Unit
td
IOL
IOH
Delay from Sample Clock to Valid Output, Figure 2
2.5
2.5
Cycle
Output Sinking Current at Vout = 0.4 V
Output Sourcing Current at Vout = VDD – 0.1 V
Propagation Delay from the Clock Rising Edge to Valid Data Output
(CL = 15 pF), Figure 1
2.0
—
mA
– 0.4
—
mA
tQLH, tQHL
—
40
ns
IOTR
Maximum Three–State Leakage Current
—
±
50
μ
A
NOTES:
1. Unit “LSB” means ideal LSB (see definitions section).
2. “Difference” means difference between any two converters in the same package.
50%
10%
CLK
VDD(D)
VSS(D)
tf
90%
tr
twH
twL
DATA
OUTPUT
50%
tQLH, tQHL
Figure 1. Clock and Output Timing
PIN DESCRIPTIONS
Pin No.
Name
Function
1
B7
Output Blue, Bit 7 (MSB)
2
G0
Output Green, Bit 0 (LSB)
3
G1
Output Green, Bit 1
4
G2
Output Green, Bit 2
5
G3
Output Green, Bit 3
6
CS
Chip Select
7
G4
Output Green, Bit 4
8
G5
Output Green, Bit 5
9
G6
Output Green, Bit 6
10
G7
Output Green, Bit 7 (MSB)
11
R0
Output Red, Bit 0 (LSB)
12
VDD(D)
R1
VDD, Digital
Output Red, Bit 1
13
14
R2
Output Red, Bit 2
15
R3
Output Red, Bit 3
16
VSS(D)
CLK
VSS, Digital
Clock Input
17
18
R4
Output Red, Bit 4
19
R5
Output Red, Bit 5
20
R6
Output Red, Bit 6
21
R7
Output Red, Bit 7 (MSB)
22
VSS(A)
VSS, Analog
Pin No.
Name
Function
23
HZ
Horizontal Sync
24
VTN
Vertical Sync
25
VDD(R)
RTOP
Rin
RMID
Gin
RBOT
Bin
VSS(R)
IBIAS
VDD(A)
MODE
VDD, reference
Reference Tapping, Top
26
27
Analog Input, Red
28
Reference Tapping, Middle
29
Analog Input, Green
30
Reference Tapping, Bottom
31
Analog Input, Blue
32
VSS for Reference Voltage
To External Bias Resistor
33
34
VDD, Analog
Clamp Level Select Input
35
36
B0
Output Blue, Bit 0 (LSB)
37
B1
Output Blue, Bit 1
38
B2
Output Blue, Bit 2
39
B3
Output Blue, Bit 3
40
VSS(D)
B4
VSS, Digital
Output Blue, Bit 4
41
42
B5
Output Blue, Bit 5
43
B6
Output Blue, Bit 6
44
VDD(D)
VDD, Digital
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