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参数资料
| 型号： | MM74HCT14SJX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 2/11页 |
| 文件大小： | 0K |
| 描述： | IC SCHMITT TRIGG HEX INV 14-SOP |
| 标准包装： | 2,000 |
| 系列： | 74HCT |
| 逻辑类型： | 逆变器，缓冲器 |
| 电路数： | 6 |
| 输入数： | 1 |
| 特点： | 施密特触发器 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 静态（最大值）： | 1µA |
| 输出电流高，低： | 4.8mA，4.8mA |
| 逻辑电平 - 低： | 0.5 V ~ 0.6 V |
| 逻辑电平 - 高： | 1.9 V ~ 2.1 V |
| 额定电压和最大 CL 时的最大传播延迟： | 20ns @ 5V，50pF |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 14-SOIC |
| 封装/外壳： | 14-SOIC（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FMS6143A Rev. 1.0.1
10
FMS6143A
—Three-Channel
6
th
-Order
Standard-Definition
VoltagePlus
Video
Filter
Driver
The same method can be used for biased signals, with
the addition of a pull-up resistor to make sure the clamp
never operates. The internal pull-down resistance is
800k ±20%, so the external resistance should be
7.5M to set the DC level to 500mV:
LCVF
Bias
Input
0.1μ
External video
source must
be AC coupled
500mV +/-350mV
75
7.5M
75
Figure 16. Biased SCART with DC-Coupled Outputs
The same circuits can be used with AC-coupled outputs
if desired.
DVD or
STB
SoC
DAC
Output
75
LCVF
Clamp
Active
0.1μ
0V - 1.4V
220μ
Figure 17. DC-Coupled Inputs, AC-Coupled Outputs
DVD or
STB
SoC
DAC
Output
LCVF
Clamp
Active
0.1μ
0V - 1.4V
75
220μ
Figure 18. AC-Coupled Inputs and Outputs
LCVF
Clamp
Active
0.1μ
External video
source must
be AC coupled
0V - 1.4V
220μ
75
Figure 19. Biased SCART with AC-Coupled Outputs
NOTE: The video tilt or line time distortion is dominated
by the AC-coupling capacitor. The value may need to be
increased beyond 220μF to obtain satisfactory operation
in some applications.
Power Dissipation
The FMS6143A output drive configuration must be
considered when calculating overall power dissipation.
Care must be taken not to exceed the maximum die
junction temperature. The following example can be
used to calculate the power dissipation and internal
temperature rise:
TJ = TA + PD JA
(1)
where: PD = PCH1 + PCH2 + PCH3 and
(2)
PCHX = VCC ICH - (VO
2/R
L)
(3)
where: VO = 2VIN + 0.280V
(4)
ICH = (ICC/3) + (VO/RL)
(5)
VIN = RMS value of input signal
ICC = 15mA
VCC = 3.3V
RL = channel load resistance.
Board layout can also affect thermal characteristics.
Refer to the Layout Considerations section for details.
The FMS6143A is specified to operate with output
currents typically less than 50mA, more than sufficient
for a dual (75) video load. Internal amplifiers are
current limited to a maximum of 100mA and should
withstand brief-duration short-circuit conditions. This
capability is not guaranteed.
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