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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 18/26頁 |
| 文件大小： | 639K |
| 代理商： | MM74C917 |
VIII. INTERFACING TO MICROPROCESSORS
The CMOS LED display controllers can be easily interfaced
to most of the popular microprocessors with the addition of
only a few ICs. Most microprocessor data and address bus
logic is specified to be TTL compatible. A standard TTL logic
high, V
is supposed to be
≥
2.4V at full load which is not
compatible with a CMOS V
≥
3.5V. Although microproces-
sor inputs will typically pull-up above 3.5V, this is not guaran-
teed over the entire temperature range. It is recommended
that pull-up resistors be added to raise this level above 3.5V.
Under most conditions, a 5k–10k resistor should suffice.
The write timing of the display controllers is illustated in Fig-
ure 26 The minimum write access time is 430 ns for the
MM74C912/MM74C917 and 450 ns for the MM74C911. A
write to the controller is accomplished by placing the desired
data on the data inputs, lowering the CE and WE inputs, and
(a)
AN006030-27
(b)
“ON” SEGMENTS
DP
G
1/0
0
1/0
0
1/0
0
1/0
0
1/0
0
1/0
0
1/0
0
1/0
0
1/0
1
1/0
1
1/0
1
1/0
1
1/0
1
1/0
1
1/0
1
1/0
1
BCD INPUTS
D
C
1
1
1
1
0
0
0
1
1
1
—
—
—
—
0
0
1
1
—
—
0
1
1
0
1
0
0
1
—
—
1
0
D
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
B
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
B
1
0
0
1
1
—
—
0
0
—
0
1
1
0
—
0
A
1
0
1
1
0
—
—
0
1
—
0
1
0
1
—
0
DP
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
1/0
FIGURE 25. MM74C912 (a) 4 Digit Display with Discrete LEDs (b) I/O Data Table
www.fairchildsemi.com
18
相關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 |
相關代理商/技術參數(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、復用器和解復用器 16-Key Encoder RoHS:否 制造商:Micrel 產品: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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