Description
/100 seconds to years. The counters are controlled by a pulse train divided down from a crystal oscillator circuit, and the frequency of the crystal is selectable 3 Description. Supports 1-MHz Fast Mode Plus I2C Bus. The TCA8418E is a keypad scan device with integrated ESD protection. It can operate from 1.65 V. Features. 16 Key Pushbutton Pad in 4 x 4 Matrix. Four Digit Multiplexed LED Display with Flashing Colon. Industrial Real Time Clock/Timer. Controls to control the decoded address lines and a 74LS139 decoder driven from the least significant address bits provides the active-low CS1 through CS4 signals. by a 74LS139 dual 1-of-4 demultiplexer. The state of inputs. 1A and 1B determines which channel is selected, and the state of inputs 2A and 2B determines
Part Number | 74LS139 |
Brand | STMicroelectronics |
Image |
74LS139
STMicroel
108
1.61
Gentle Electronic (HK) Limited
74LS139
STMICROELECT
100
2.1775
Sino Star Electronics (HK) Co.,Limited
74LS139
ST/MICRON
13352
2.745
Yingxinyuan INT'L (Group) Limited
74LS139
ST
20680
3.3125
ZHONGGANG TECHNOLOGY (HK) INDUSTRY LIMITED
74LS139
STMicroelectronics
8385
3.88
Dedicate Electronics (HK) Limited