器件名称: NE555D
功能描述: PRECISION TIMERS
文件大小: 253.74KB 共15页
简 介:NE555, NE555Y, SA555, SE555, SE555C PRECISION TIMERS
SLFS022 – SEPTEMBER 1973 – REVISED FEBRUARY 1992
D D D D D
Timing From Microseconds to Hours Astable or Monostable Operation Adjustable Duty Cycle TTL-Compatible Output Can Sink or Source up to 200 mA Functionally Interchangeable With the Signetics NE555, SA555, SE555, SE555C; Have Same Pinout
D, JG, OR P PACKAGE (TOP VIEW)
GND TRIG OUT RESET
1 2 3 4
8 7 6 5
VCC DISCH THRES CONT
FK PACKAGE (TOP VIEW)
description
These devices are precision monolithic timing circuits capable of producing accurate time delays or oscillation. In the time-delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the astable mode of operation, the frequency and duty cycle may be independently controlled with two external resistors and a single external capacitor.
NC TRIG NC OUT NC
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
NC GND NC VCC NC NC DISCH NC THRES NC
NC–No internal connection AVAILABLE OPTIONS PACKAGE
SE555C FROM TI IS NOT RECOMMENDED FOR NEW DESIGNS
The threshold and trigger levels are normally two-thirds and one-third, respectively, of VCC. These levels can be altered by use of the control voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the outpu……
