TC74HC123AP/AF TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC123AP, TC74HC123AF Dual Retriggerable Monostable Multivibrator The TC74HC123A is a high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. There are two trigger inputs, A input (negative edge), and B input (positive edge). These inputs are valid for a slow rise/fall time signal (tr = tf = 1 s) as they are schmitt trigger inputs. This device may also be triggered by using CLR input (positive edge). After triggering, the output stays in a MONOSTABLE state for a time period determined by the external resistor and capacitor (Rx, Cx ). A low level at the CLR input breaks this state. In the MONOSTABLE state, if a new trigger is applied, it extends the MONOSTABLE period (retrigger mode). Limits for Cx and Rx are: External capacitor, Cx: No limit External resistor, Rx: VCC = 2.0 V more than 5 kΩ VCC ≥ 3.0 V more than 1 kΩ All inputs are equipped with protection circuits against static discharge or transient excess voltage. TC74HC123AP TC74HC123AF Weight DIP16-P-300-2.54A SOP16-P-300-1.27A 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 Ta = 25°C • High noise immunity: VNIH = VNIL = 28% VCC (min) • Output drive capability: 10 LSTTL loads • • Symmetrical output impedance: |IOH| = IOL = 4 mA (min) ∼ Balanced propagation delays: tpLH − tpHL • Wide operating voltage range: VCC (opr) = 2 to 6 V • : 1.00 g (typ.) : 0.18 g (typ.) Pin and function compatible with 74LS123 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 commercial production 1988-05 1 2014-03-01 TC74HC123AP/AF 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 mA. 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 mA (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 rush current. Truth Table Inputs Outputs CLR H H X L H L H Inhibit H X H L H Inhibit L Q Function B A Q Output Enable H L H X X Output Enable Output Enable L L H Inhibit X: Don’t care 3 2014-03-01




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型式 数量 D/C・lead 備考 選択
TC74HC123AF 256個 N/A N/A
TC74HC123AF 10個 N/A  
TC74HC123AF 8268個    
TC74HC123AF 3740個    
TC74HC123AF 3600個    


型式 数量 D/C・lead 備考 選択
TC74HC123AF 12個    
TC74HC123AF(ELNE,F 3500個    
TC74HC123AF(ELNE,F) 729個    
TC74HC123AF(ELNEW) 4000個    
TC74HC123AF(ELNEW.F) 1566個    
TC74HC123AF(NEW,F) 100個    
TC74HC123AF(NEW,F) 100個    



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