TC74VHC123,221AF/AFT/AFK TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74VHC123AF, TC74VHC123AFT, TC74VHC123AFK TC74VHC221AF, TC74VHC221AFT, TC74VHC221AFK Dual Monostable Multivibrator TC74VHC123AF/AFT/AFK Retriggerable TC74VHC123AF, TC74VHC221AF TC74VHC221AF/AFT/AFK Non-Retriggerable The TC74VHC123A/221A are high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate 2 C MOS technology. 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 (t = t = 1 s) as they are schmitt trigger inputs. This TC74VHC123AFT, TC74VHC221AFT r f 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 (R , C ). A low level at the CLR input breaks this state. X X Limits for C and R are: X X External capacitor, C : No limit X External resistor, R : V = 2.0 V more than 5 k X CC V 3.0 V more than 1 k CC TC74VHC123AFK, TC74VHC221AFK An input protection circuit ensures that 0 to 5.5 V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5 V to 3 V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages. Features High speed: t = 8.1 ns (typ.) at V = 5 V pd CC Low power dissipation Weight Standby state: 4 A (max) at Ta = 25C SOP16-P-300-1.27A : 0.18 g (typ.) Active state: 600 A (max) at Ta = 25C TSSOP16-P-0044-0.65A : 0.06 g (typ.) VSSOP16-P-0030-0.50 : 0.02 g (typ.) High noise immunity: V = V = 28% V (min) NIH NIL CC Power down protection is equipped with all inputs. Balanced propagation delays: t t pLH pHL Wide operating voltage range: V (opr) = 2 to 5.5 V CC Pin and function compatible with 74HC123A/221A Start of commercial production 1991-11 1 2014-03-01 TC74VHC123,221AF/AFT/AFK Pin Assignment 1 16 V 1A CC 1B 2 15 1R /C X X 14 1C 1CLR 3 X 4 13 1Q 1Q 2Q 5 12 2Q 2C 6 11 2CLR X 2R /C 7 10 2B X X GND 8 9 2A (top view) IEC Logic Symbol TC74VHC123A TC74VHC221A (1) (1) 1 1A & 1A & (2) (13) (2) (13) 1B 1Q 1B 1Q (3) (4) (3) (4) 1CLR R 1Q 1CLR R 1Q (14) (14) 1C C 1C C X X X X (15) (15) 1R /C R /C 1R /C R /C X X X X X X X X (9) (9) 2A 2A 1 & & (10) (5) (10) (5) 2B 2Q 2B 2Q (11) (12) (11) (12) 2CLR 2Q 2CLR 2Q R R (6) (6) 2C 2C X C X C X X (7) (7) 2R /C 2R /C X X R /C X X R /C X X X X Truth Table Inputs Outputs Function A B CLR Q Q H H Output Enable L X L H H Inhibit H X H L H Inhibit L H Output Enable L H Output Enable X X L L H Reset X: Dont care 2 2014-03-01