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M74HC123A Arkusz danych(PDF) 1 Page - STMicroelectronics |
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M74HC123A Arkusz danych(HTML) 1 Page - STMicroelectronics |
1 / 14 page M54HC123/123A M74HC123/123A October 1993 DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR B1R (Plastic Package) ORDER CODES : M54HCXXXF1R M74HCXXXM1R M74HCXXXB1R M74HCXXXC1R F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) PIN CONNECTIONS (top view) NC = No Internal Connection . HIGH SPEED tPD = 25 ns (TYP) at VCC =5V . LOW POWER DISSIPATION STANDBY STATE ICC=4 µA (MAX.) AT TA=25°C ACTIVE STATE ICC = 200 µA (TYP.) AT VCC=5V . 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 V TO 6 V . WIDE OUTPUT PULSE WIDTH RANGE tWOUT = 120 ns ∼ 60 s OVER AT VCC = 4.5 V . PIN AND FUNCTION COMPATIBLE WITH 54/74LS123 The M54/74HC123 is a high speed CMOS MONO- STABLE multivibrator fabricated with silicon gate C 2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while main- taining the CMOS low power dissipation. There are two trigger inputs, A INPUT (negative edge) and 8 INPUT (positive edge). These inputs are valid for slow rising/falling signals, (tr = tf = I sec). The device may also be triggered by using the CLR input (posi- tive-edge) because of the Schmitt-trigger input ; after triggering the output maintains the MONO- STABLE state for the time period determined by the external resistor Rx and capacitor Cx. When Cx ≥ 10nF and Rx ≥ 10KΩ, the output pulse width value is approssimatively given by the formula: tw(out) =K • Cx • Rx. Two different pulse width constant are available: K ≅ 0.45 for HC123 K ≅ 1 for HC123A. Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLEperiod it makes the MONOSTABLE period longer. Limit for values of Cx and Rx : Cx : NO LIMIT Rx : VCC < 3.0 V 5 K Ω to 1 M Ω VCC ≥ 3.0 V 1 K Ω to 1 M Ω All inputs are equipped with protection circuits DESCRIPTION 1/14 |
Podobny numer części - M74HC123A |
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Podobny opis - M74HC123A |
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