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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)： | 1/26頁(yè) |
| 文件大小： | 639K |
| 代理商： | MM74C917 |
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Simplified Multi-Digit LED
Display Design Using
MM74C911/MM74C912/
MM74C917 Display
Controllers
I. INTRODUCTION
The MM74C911, MM74C912 and MM74C917 are CMOS
display controllers that control multiplexing of 8-segment
LED displays. These devices each have an on-chip multiplex
oscillator and associated logic to easily implement multi-digit
displays with minimal additional hardware. These controllers
were designed to be easily interfaced to a microprocessor as
a small 4- or 6-byte area of write-only memory (WOM), but
they are not limited to this environment.
The MM74C911 is the simplest of these devices. It has one
data input for each of its eight segment outputs, allowing di-
rect control of any LED segment. Both the MM74C912 and
MM74C917 have five data inputs which accept either BCD
(MM74C912) or hexadecimal (MM74C917) data, plus deci-
mal point. The MM74C911 can interface up to four
8-segment displays and the MM74C912/MM74C917 can
control up to six 8-segment displays.
II. FUNCTIONAL DESCRIPTION—MM74C911
The functional block diagram for the MM74C911 is shown in
Figure 1 The eight data inputs are buffered and bussed to
the four dual-port latches. To write data into a particular
latch, K1 and K2 address inputs are decoded and the proper
latch is enabled when CE and WE are taken low.
The latch outputs are controlled by the multiplexer (MUX)
logic. All four latch data outputs are commonly bussed, and
are sequentially read by the MUX logic. The bussed
8-segment outputs are then buffered by bipolar segment
driver transistors, which are enabled when SOE is low, and
are in 3-STATE mode when Segment Output Enable (SOE )
is held high. This allows easy display blanking without loss of
data.
The multiplexer logic controls all of the timing for the
MM74C911 and also generates the digit output strobes. The
timing diagram is shown in Figure 2
Z80
is a registered trademark of Zilog Corporation.
NSC800
is a trademark of Fairchild Semiconductor Corporation.
AN006030-1
FIGURE 1. MM74C911 Block Diagram
Fairchild Semiconductor
Application Note 257
May 1981
S
A
1998 Fairchild Semiconductor Corporation
AN006030
www.fairchildsemi.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MM74C922 | 16-Key Encoder 20-Key Encoder |
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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