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參數(shù)資料
| 型號： | MM74HCT14SJ |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SCHMITT TRIGG HEX INV 14-SOP |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 系列： | 74HCT |
| 邏輯類型： | 逆變器，緩沖器 |
| 電路數(shù)： | 6 |
| 輸入數(shù)： | 1 |
| 特點(diǎn)： | 施密特觸發(fā)器 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 電流 - 靜態(tài)（最大值）： | 1µA |
| 輸出電流高，低： | 4.8mA，4.8mA |
| 邏輯電平 - 低： | 0.5 V ~ 0.6 V |
| 邏輯電平 - 高： | 1.9 V ~ 2.1 V |
| 額定電壓和最大 CL 時(shí)的最大傳播延遲： | 20ns @ 5V，50pF |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 封裝/外殼： | 14-SOIC（0.209"，5.30mm 寬） |
| 包裝： | 管件 |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FMS6143A Rev. 1.0.1
9
FMS6143A
—Three-Channel
6
th
-Order
Standard-Definition
VoltagePlus
Video
Filter
Driver
Application Information
Application Circuits
The FMS6143A VoltagePlus video filter provides 6dB
gain from input to output. In addition, the input is slightly
offset to optimize the output driver performance. The
offset is held to the minimum required value to decrease
the standing DC current into the load. Typical voltage
levels are shown in Figure 11.
There is a 280mV offset from the DC input level to the
DC output level. V OUT = 2 * V IN + 280mV.
0.0 -> 0.02V
0.3 -> 0.32V
0.65 -> 0.67V
1.0 -> 1.02V
VIN
0.28V
0.88V
1.58V
2.28V
Driven by:
DC-Coupled DAC Outputs
AC-Coupled and Clamped
Y, CV, R, G, B
VOUT
0.15V
0.5V
0.85V
VIN
0.58V
1.28V
1.98V
Driven by:
AC-Coupled and Biased
U, V, Pb, Pr, C
VOUT
Figure 11. Typical Voltage Levels
The FMS6143A provides an internal diode clamp to
support AC-coupled input signals. If the input signal
does not go below ground, the input clamp does not
operate. This allows DAC outputs to directly drive the
FMS6143A without an AC coupling capacitor. When the
input is AC coupled, the diode clamp sets the sync tip
(or lowest voltage) just below ground. The worst-case
sync tip compression due to the clamp cannot exceed
7mV. The input level set by the clamp, combined with
the internal DC offset, keeps the output within its
acceptable range.
For symmetric signals like Chroma, U, V, Pb, and Pr;
the average DC bias is fairly constant and the inputs can
be AC coupled with the addition of a pull-up resistor to
set the DC input voltage. DAC outputs can also drive
these same signals without the AC-coupling capacitor. A
conceptual illustration of the input clamp circuit is shown
in Figure 12.
YOUT
Video Cables
75
Driver
YIN
LOAD1
LOAD2
(optional)
0.65V
Figure 12. Input Clamp Circuit
I/O Configurations
For a DC-coupled DAC drive with DC-coupled outputs,
use this configuration:
DVD or
STB
SoC
DAC
Output
75W
LCVF
Clamp
Inactive
0V - 1.4V
Figure 13. DC-Coupled Inputs and Outputs
Alternatively, if the DAC’s average DC output level causes
the signal to exceed the range of 0V to 1.4V, it can be
AC coupled as:
DVD or
STB
SoC
DAC
Output
LCVF
Clamp
Active
0.1μ
0V - 1.4V
75
Figure 14. AC-Coupled Inputs, DC-Coupled Outputs
When the FMS6143A is driven by an unknown external
source or a SCART switch with its own clamping circuitry,
the inputs should be AC coupled as shown in Figure 15.
75
LCVF
Clamp
Active
0.1μ
External video
source must
be AC coupled
0V - 1.4V
75
Figure 15. SCART with DC-Coupled Outputs
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| MM74HCT14SJX | 功能描述:變換器 Hex Inv Schm Trigger RoHS:否 制造商:NXP Semiconductors 電路數(shù)量:6 邏輯系列:74ABT 邏輯類型:BiCMOS 高電平輸出電流:- 15 mA 低電平輸出電流:20 mA 傳播延遲時(shí)間:2.2 ns 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 工作溫度范圍: 封裝 / 箱體:DIP-14 封裝:Tube |
| MM74HCT151 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Channel Digital Multiplexer |
| MM74HCT151J | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Channel Digital Multiplexer |
| MM74HCT151N | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MM74HCT155 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 2-to-4 Line Decoder/Demultiplexers |
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