74HCT5555

The 74HCT5555 is designed as high-speed si-gate CMOS devices and are pin compatible with low power schottky TTL (LSTTL). It is specified in compliance with JEDEC standard no. 7A. It is precision programmable delay timers which consist of 24-stage binary counter, integrated oscillator (using external timing components), retriggerable / non-retriggerable monostable, automatic power-ON reset, output control logic, oscillator control logic and overriding asynchronous master reset (MR).

The features of the 74HCT5555. The first one is positive and negative edge triggered. The second one is retriggerable or non-retriggerable. The third one is programmable delay which means minimum 100 ns and maximum depends on input frequency and division ratio. The fourth one is divide-by range of 2 to 2^24. The fifth one is direct reset terminates output pulse. The sixth one is very low power consumption in triggered start mode. The seventh one is 3 oscillator operating modes include RC oscillator, crystal oscillator, external oscillator. The eighth one is device is unaffected by variations in temperature and VCC when using an external oscillator. The ninth one is automatic power-ON reset. The tenth one is schmitt trigger action on both trigger inputs. And so on. That are the main features.

Some important AC characteristics and specifications of the 74HCT5555 have been concluded into several points as follow.For Tamb=25°C the first one is about its propagation delay A to Q which would be typ 77ns and max 240ns at Vcc=2.0V and would be typ 28ns and max 48ns at Vcc=4.5V and would be typ 22ns and max 41ns at Vcc=6.0V. The second one is about its propagation delay MR to Q which would be typ 61ns and max 185ns at Vcc=2.0V and typ 22ns and max 37ns at Vcc=4.5V and would be typ 18ns and max 31ns at Vcc=6.0V. The third one is about its output transition time which would be typ 19ns and max 75ns at Vcc=2.0V and typ 7ns and max 15ns at Vcc=4.5V and would be typ 6ns and max 13ns at Vcc=6.0V. And so on. For more information please contact us.

The 74HCT5555 is high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HCT5555 is precision programmable delay timers which consist of: