TC74AC390F

The TC74AC390F is one member of the TC74AC390 series.The TC74AC390 is an advanced high speed CMOS dual decade counter fabricated with silicon gate and double-layer metal wiring C2MOS technology.It achieves the high speed operation similar to equivalent Bipolar Schottky TTL  while maintaining the CMOS low power dissipation.It consists of two independent 4-bit counters, each composed of a divide-by-two and a divide-by-five counter.The divide-by-two counter is incremented on the negative going transition of clock A (CKA).The divided-by-five counter is incremented on the negative going transition of clock B(CKB).The counter  can be cascaded to form decade, bi-quinary, or various combinations up to a divide-by-100 counter.When the CLEAR input is set high, the Q outputs are set to low independent of the clock inputs.

Features of the TC74AC390F are:(1)high speed:fmax=160MHz(typ.) at Vcc=5V;(2)low power dissipation:Icc=8A(Max.) at Ta=25;(3)symmetrical output impedance:|IOH|=Iol=24mA(Min.) capability of driving 50 tansmission lines;(4)balanced propagation delays:tpLHtPHL;(6)wide operating voltage range:Vcc (opr)=2V~5.5V;(7)pin and function compatible with 74F390;(8)high noise immunity:Vnih=Vnil=28%Vcc(Min).

The absolute maximum ratings of the TC74AC390F can be summarized as:(1)supply voltage range:-0.5 to 7.0V;(2)DC input voltage:-0.5 to Vcc+0.5V;(3)DC output voltage:-0.5 to Vcc+0.5V;(4)input diode current:±20mA; (5)output diode current:±50mA;(6)DC output current:±50mA;(7)DC Vcc/ground current:±100mA;(8)power dissipation:500mW; (9)storage temperature:-65 to 150.TOSHIBA is continually working to improve the quality and the reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to observe standards of safety, and to avoid situations in which a malfunction or failure of a TOSHIBA product could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent products specifications of the TC74AC390F. Also, please keep in mind the precautions and conditions set forth in the TOSHIBA Semiconductor Reliability Handbook.