- 您現在的位置：買賣IC網 > PDF目錄377976 > MM74C911 (Fairchild Semiconductor Corporation) Simplified Multi-Digit LED Display Controller(多數字式LED顯示控制器) PDF資料下載
參數資料
| 型號： | MM74C911 |
| 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： | 1/26頁 |
| 文件大小： | 639K |
| 代理商： | MM74C911 |
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PDF資料 |
PDF描述 |
|---|---|
| MM74C912 | Simplified Multi-Digit LED Display Controller(多數字式LED顯示控制器) |
| 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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MM74C911N | 功能描述:LED顯示驅動器 4-Dgt Dis Controller 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 |
| MM74C912 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:6-Digit BCD Display Controller/Driver |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。