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參數資料
| 型號： | MM74C912 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Simplified Multi-Digit LED Display Controller(多數字式LED顯示控制器) |
| 中文描述： | 簡化的多位LED顯示控制器（多數字式的LED顯示控制器） |
| 文件頁數： | 6/26頁 |
| 文件大?。?/td> | 639K |
| 代理商： | MM74C912 |
Figure 10 and Figure 11 tabulate some typical segment re-
sistor values for various Fairchild LED displays. (See Opto-
electronics Databook for detailed specifications.) This table
was compiled for a well lit room, but variation in ambient
lighting may require some slight modification in the typical
segment resistor values.
If a transistor digit driver is being used, it is sometimes desir-
able to use a base current limiting resistor between the con-
troller’s output and the transistor’s base. This will help limit
the power dissipation of the display controller in critical situ-
ations. The digit resistor, R
DIG
, can be calculated using:
where V
is the digit driver input voltage, 0.7V for a transis-
tor, I
is the desired digit driver current and V
is the con-
troller’s digit output voltage for the chosen current which can
be found from Figure 12
When the MM74C911 is to be used as a “master” to drive an-
other MM74C911 or other logic, the digit outputs must have
a high output voltage of 3.0V to drive another MM74C911 or
3.5V to drive standard CMOS logic. The digit resistor should
be
>
300
for V
OH
≥
3.0V and R
DIG
>
350 for V
OH
≥
3.5V.
A final design consideration is power dissipation. When de-
signing a low-power system where the total current is to be
minimized, the total system power consumption is simply:
P
T
V
CC
(I
DO
+ I
DI
)
where I
is the maximum digit driver output current, V
is
the power supply voltage, and I
DI
is the digit driver input
current.
Display
Driver
Typical Range of
Segment Resistors
300
–1000
300
–2000
*
200
–800
200
–1800
*
15
–80
Part No.
NSA1298
Height (In.)
0.110
No. of Digits
9
DS75492
NSA1558
0.140
8
DS75492
NSN381
0.3
2
DS75492
2N3904
DS75492
2N3904
DS75492
2N3904
DS75492
2N3904
DS75492
2N3904
DS75492
2N3904
NSB3881
0.5
4
15
–80
NSN581
0.5
2
10
–60
NSB5881
0.5
4
10
–60
NSN781
0.7
2
10
–50
NSB7881
0.7
4
10
–50
FIGURE 10. MM74C911 Segment Resistor Values for Various Displays (V
CC
= 5V)
(
*
Using Red LED Filter over Display)
www.fairchildsemi.com
6
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|---|---|
| MM74C917 | Simplified Multi-Digit LED Display Controller(多數字式LED顯示控制器) |
| MM74C912N | 6-Digit BCD Display Controller/Driver |
| MM74C914 | Hex Schmitt Trigger with Extended Input Voltage |
| MM74C914M | Hex Schmitt Trigger with Extended Input Voltage |
| MM74C914N | Hex Schmitt Trigger with Extended Input Voltage |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MM74C912N | 功能描述:LED顯示驅動器 6-Dgt BCD Dis Con/Dr RoHS:否 制造商:Micrel 數位數量:5 片段數量: 安裝風格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MM74C914 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Hex Schmitt Trigger with Extended Input Voltage |
| MM74C914J | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Hex Schmitt Trigger with Extended Input Voltage |
| MM74C914M | 功能描述:變換器 Hex Schmitt Trigger RoHS:否 制造商:NXP Semiconductors 電路數量: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 |
| MM74C914M_Q | 功能描述:變換器 Hex Schmitt Trigger RoHS:否 制造商:NXP Semiconductors 電路數量: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 |
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