| Part Number | MC14499 |
| Manufacturer | Motorola |
| Title | 7-Segment LED Display Decoder/Driver with Serial Interface |
| Description | MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC14499/D MC14499 7-Segment LED Display Decoder/Driver with Serial Interface CMOS ... |
| Features |
NPN output drivers which allow interfacing to common cathode LED displays through external series resistors. • • • • • • High –Current Segment Drivers On –Chip CMOS MPU compatible Input Levels Wide Operating Voltage Range: 4.5 to 6.5 V Operating Temperature Range: 0 to 70°C Drives Four Characters with... |
| File Size | 161.74KB |
| Datasheet |
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MC14490 : MOTOROLA SEMICONDUCTOR TECHNICAL DATA MC14490 Hex Contact Bounce Eliminator The MC14490 is constructed with complementary MOS enhancement mode devices, and is used for the elimination of extraneous level changes that result when interfacing with mechanical contacts. The digital contact bounce eliminator circuit takes an input signal from a bouncing contact and generates a clean digital signal four clock periods after the input has stabilized. The bounce eliminator circuit will remove bounce on both the “make” and the “break” of a contact closure. The clock for operation of the MC14490 is derived from an internal R–C oscillator which requires only an external capacitor to adjust for the des.
MC14490 : MC14490 Hex Contact Bounce Eliminator The MC14490 is constructed with complementary MOS enhancement mode devices, and is used for the elimination of extraneous level changes that result when interfacing with mechanical contacts. The digital contact bounce eliminator circuit takes an input signal from a bouncing contact and generates a clean digital signal four clock periods after the input has stabilized. The bounce eliminator circuit will remove bounce on both the “make” and the “break” of a contact closure. The clock for operation of the MC14490 is derived from an internal R−C oscillator which requires only an external capacitor to adjust for the desired operating frequency (bounce delay).
MC14495-1 : .
MC14495P : www.DataSheet4U.com MC14495P IL00D C-MOS BCD-TO-SEVEN-SEGMENT 4-BIT LATCH / DECODER DRIVER —TOP VIEW— 5 A B C D a b c d e f g 7 12 13 14 15 1 2 3 e OUT 1 f OUT 2 g OUT 3 h+i OUT 4 A IN 5 B IN 6 CK IN 7 8 GND VDD 16 15 d OUT 14 c OUT 13 b OUT 12 a OUT 11 VCR IN 10 D IN 9 C IN 6 9 10 h+i VCR a 4 11 f g b e d c INPUTS CK D C B 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1 1 0 0 1 1 0 1 0 0 0 1 0 0 0 1 0 1 0 1 0 1 0 1 1 0 0 1 1 0 0 1 1 1 0 1 1 1 X X X 1 X X X 0 1 X Z ; ; ; ; A 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 X X a 1 0 1 1 0 1 1 1 1 1 1 0 1 0 1 1 X X b 1 1 1 1 1 0 0 1 1 1 1 0 0 1 0 0 X X c 1 1 0 1 1 1 1 1 1 1 1 1 0 1 0 0 X X OUTPUTS d e f g 1 1 1 0 0 0 0 0 1 1 0 1 1 0 0 .
MC14497 : E1 – E8 Row Inputs (Pins 1, 2, 10, 11, 14, 15, 16, 17) Under idle conditions, these inputs are held high by internal pull–up resistors. As soon as a key is pressed, a logical 0 on that particular line signals to the circuit that a key has been selected. After a delay of 20 ms, the internal register is loaded with the code word for the key selected. E9 Row Input (Pin 3) This is a special programming input and when connected to the appropriate scanner output via a diode, it will modify the transmitted output according to Table NO TAG. In Table NO TAG, the figures in brackets (FK1, etc.) refer to the switches shown in the Block Diagram and Figure 3. If only one option is required, the diode ma.