參數(shù)資料
型號(hào)： MM74C917
廠商： Fairchild Semiconductor Corporation
英文描述： Simplified Multi-Digit LED Display Controller(多數(shù)字式LED顯示控制器)
中文描述： 簡(jiǎn)化的多位LED顯示控制器（多數(shù)字式的LED顯示控制器）
文件頁(yè)數(shù)： 8/26頁(yè)
文件大?。?/td> 639K
代理商： MM74C917
ments. Segment resistors on the controller’s segment out-
puts are not necessary but may be necessary on the outputs
of the DS8871 driver.
For higher current displays, the choice of digit driver transis-
tor is important as the digit current will depend on how high
the digit driver output of the display controller can pull up due
to the emitter follower configuration. For good display bright-
ness, a high gain medium power transistor should be used.
C. Vacuum Fluorescent (VF) Displays
The MM74C911/MM74C912/MM74C917 are not directly ca-
pable of driving VF displays, but serve as a major functional
block to ease driving 4- or 6-digit displays. The controllers
provide the multiplex timing for this display, but the segment
and digit outputs must be level shifted, and a filament volt-
age must be applied.
In Figure 16 a DS8654 or similar device is used to translate
the segment and digit voltages to 30V to drive the segment
plates and digit grids. The AC filament voltage is derived
from a separate low-voltage transformer which is biased by a
zener. Since there is no pull-down in the DS8654, pull-down
resistors must be added. The exact anode and cathode volt-
ages and the bias zener will depend on the display used, but
the basic circuit is the same.
(a)
AN006030-13
(b)
AN006030-14
FIGURE 13. MM74C911/MM74C912/MM74C917
Maximum Power Dissipation for (a) Plastic “N”
Package
(b) Ceramic “J” Package (Note T
= 125C
Maximum Junction Temperature)
(a)
AN006030-15
(b)
AN006030-16
FIGURE 14. Typical Power Dissipation vs. Segment
Current for (a) MM74C911 (b) MM74C912/MM74C917
www.fairchildsemi.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MM74C918 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual CMOS 30V Relay Driver
MM74C918J 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual CMOS 30V Relay Driver
MM74C918N 制造商:NATIONAL SEMICONDUCTOR 功能描述:SEMICONDUCTOR INTEGRATED CIRCUIT 制造商:National Semiconductor Corporation 功能描述:SEMICONDUCTOR INTEGRATED CIRCUIT
MM74C922 制造商:NSC 制造商全稱:National Semiconductor 功能描述:16, 20-Key Encoder
MM74C922N 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 16-Key Encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray
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