4331 计时器IC，倒计时IC，正计时IC.

general deyfription the yf4331 is an up/down timer ic. it can directly drive a standard 4 digit 1/4 duty cycle lcd. maximum countdown time is 59:59 or 99:59. count up cycle time is 60 or 100 minutes by bonding option. also bonding option is for alarm time 32 or 64 seconds, 2khz, and up/down or just down function. feasible input options and universal functions give functions give this chip many uses such as parking alarm timer, pillbox timer, kitchen timer, etc. functions ? special alarm trigger output for switch control or for driving another melody ic ? internal voltage doubler ? 32768hz quartz crystal time base ? single 1.5v battery operation ? direct drive buzzer ? 4 digit lcd display ? maximum count 59:59 min or 99:59 min (bonding option) ? just count-down timer repeat function by bonding option ? minutes and seconds set independently ? timer reset when depressing mset and sset simultaneously ? alarm sound 2khz, 32 or 64 second (bonding option) pin deyfription 1) sset-second setting input this pin sets the seconds time for countdown mode. the setting function will only be effective when the countdown mode has been stopped or reset. if this pin is pulled high with the mset pin simultaneously, the timer will be reset. this pin has been internally pulled low. 2) mset-minute setting input this pin sets minute time for the countdown mode. like the sset pin, the minute setting function can be carried out only when the countdown mode has been stopped or reset. this pin is used, with the sset pin, to execute the reset function. it has been internally pulled low. 3) start/stop-start or stop input this pin acts as start/stop function for the up/down timer. after power-on or reset, the timer will be in a stop state. when it is triggered, the timer will be enable, and another trigger will stop the timer. it has been internally pulled low. note: the short alarm signal, 62.5ms is sounded when any input beep will be pressed.

本产品的类型是时钟计时IC，品牌是YF，型号是4331，用途是语音，封装是裸片，批号是YF-063