TC74HC423AF Datasheet | Toshiba

Features (Note) - High speed: tpd = 25 ns (typ.) at VCC = 5 V - Low power dissipation Standby state: ICC = 4 μA (max) at Ta = 25°C Active state: ICC = 700 μA (max) at VCC = 5 V - High noise immunity: VNIH = VNIL = 28% VCC (min) - Output drive capability: 10 LSTTL loads - Symmetrical output impedance: |IOH| = IOL = 4 m A (min) - Balanced propagation delays: tp LH ∼- tp HL - Wide operating voltage range: VCC (opr) = 2 to 6 V - Pin and function patible with 74LS423 Weight DIP16-P-300-2.54A SOP16-P-300-1.27A : 1.00 g (typ.) : 0.18 g (typ.) Note: In the case of using only one circuit, CLR should be tied to GND, Rx/Cx･Cx･Q･ Q should be tied to OPEN, the other inputs should be tied to VCC or GND. Start of mercial production 1988-05 2014-03-01 Pin Assignment TC74HC423AP/AF IEC Logic Symbol Block Diagram (Note 1)(Note 2) Note 1: Cx, Rx, Dx are external capacitor, resistor, and diode, respectively. Note 2: External clamping diode, Dx; The external capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied. If the supply voltage is turned off, Cx is discharges mainly through the internal (parasitic) diode. If Cx is sufficiently large and VCC drops rapidly, there will be some possibility of damaging the IC through in rush current or latch-up. If the capacitance of the supply voltage filter is large enough and VCC drops slowly, the in rush current is automatically limited and damage to the IC is avoided. The maximum value of forward current through the parasitic diode is ±20 m A. In the case of a large Cx, the limit of fall time of the supply voltage is determined as follows: tf ≥ (VCC - 0.7) Cx/20 m A (tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 VCC.) In the event a system does not satisfy the above condition, an external clamping diode (Dx) is needed to protect the IC from in...