1. general description the 74ahc123a-q100; 74ahct123a-q100 are high-speed si-gate cmos devices and are pin compatible with low-power schottky ttl (lsttl). they are specified in compliance with jedec standard no. 7a. the 74ahc123a-q100; 74ahct123a-q100 are dual retriggerable monostable multivibrators with ou tput pulse width control by three methods. the selection of an external resistor (r ext ) and capacitor (c ext ) program the basic pulse time. the external resistor and capacitor are normally connected as shown in figure 11 . once triggered, the basic output pulse width may be extended by retriggering the gated active low-going edge input (na ) or the active high-going edge input (nb). by repeating this process, the output pulse period (nq = high, nq = low) can be made as long as desired. alternatively an output delay can be terminated at any time by a low-going edge on input nr d, which also inhibits the triggering. an internal connection from nr d to the input gate makes it possible to trigger the circuit by a positive-going signal at input nr d as shown in table 3 . figure 8 and figure 9 illustrate pulse control by retriggering and early re set. the values of the external timing components r ext and c ext , determine the basic output pulse width. when c ext ? 10 nf, the typical output pulse width is defined as: t w =r ext ? c ext where t w = pulse width in ns; r ext = external resistor in k ? ; c ext = external capacitor in pf. schmitt-trigger action at all inputs makes the circuit highly tolerant to slower input rise and fall times. this product has been qualified to the automotive electronics council (aec) standard q100 (grade 1) and is suitable for use in automotive applications. 2. features and benefits ? automotive product qualif ication in accordance with aec-q100 (grade 1) ? specified from ? 40 ? c to +85 ? c and from ? 40 ? c to +125 ? c ? all inputs have a schmitt-trigger action ? inputs accept voltages higher than v cc ? dc triggered from active high or active low inputs ? retriggerable for very long pulses up to 100 % duty factor ? direct reset terminates output pulse ? for 74ahc123a-q100 only: operates with cmos input levels ? for 74ahct123a-q100 only: operates with ttl input levels ? esd protection: 74ahc123a-q100; 74ahct123a-q100 dual retriggerable monostab le multivibrator with reset rev. 1 ? 23 may 2013 product data sheet
74ahc_ahct123a_q100 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserv ed. product data sheet rev. 1 ? 23 may 2013 2 of 22 nxp semiconductors 74ahc123a-q100; 74ahct123a-q100 dual retriggerable monostable multivibrator with reset ? mil-std-883, method 3015 exceeds 2000 v ? hbm jesd22-a114f exceeds 2000 v ? mm jesd22-a115-a exceeds 200 v (c = 200 pf, r = 0 ? ) ? multiple package options 3. ordering information 4. functional diagram table 1. ordering information type number package temperature range name description version 74ahc123ad-q100 ? 40 ? cto+125 ? c so16 plastic small outline package; 16 leads; body width 3.9 mm sot109-1 74ahct123ad-q100 74AHC123APW-Q100 ? 40 ? cto+125 ? c tssop16 plastic thin shri nk small outline package; 16 leads; body width 4.4 mm sot403-1 74ahct123apw-q100 74ahc123abq-q100 ? 40 ? cto+125 ? c dhvqfn16 plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads; 16 terminals; body 2.5 ? 3.5 ? 0.85 mm sot763-1 74ahct123abq-q100 fig 1. logic symbol fig 2. iec logic symbol 001aae521 14 1 2 3 1a 1b 1rd 9 10 11 2a 2b 2rd 15 s q q t rd 13 4 1cext 1rext/cext 1q 1q 6 7 5 12 2cext 2rext/cext 2q 2q 1 2 3 13 cx & rcx r r 14 4 15 001aae522 9 10 11 5 cx & rcx 6 12 7
74ahc_ahct123a_q100 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserv ed. product data sheet rev. 1 ? 23 may 2013 3 of 22 nxp semiconductors 74ahc123a-q100; 74ahct123a-q100 dual retriggerable monostable multivibrator with reset fig 3. functional diagram 1q q 2rd rd s 13 1rext/cext 15 1cext 14 1q q 4 9 aaa-000650 1rd 2a 1 1a 10 2b 2 11 3 1b t q rd s 2rext/cext 7 2cext 6 2q 5 q 2q 12 t
74ahc_ahct123a_q100 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserv ed. product data sheet rev. 1 ? 23 may 2013 4 of 22 nxp semiconductors 74ahc123a-q100; 74ahct123a-q100 dual retriggerable monostable multivibrator with reset for minimum noise generation, ground pins 6 (2c ext) and 14 (1cext) externally to pin 8 (gnd). fig 4. functional diagram 001aae524 v cc nrext/cext q q cl cl r cl cl cl v cc v cc rr rd r a b
74ahc_ahct123a_q100 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserv ed. product data sheet rev. 1 ? 23 may 2013 5 of 22 nxp semiconductors 74ahc123a-q100; 74ahct123a-q100 dual retriggerable monostable multivibrator with reset 5. pinning information 5.1 pinning 5.2 pin description (1) this is not a supply pin. the substrate is attached to this pad using conductive die atta ch material. there is no electrical or mechanical requi rement to solder this pad. however, if it is soldered, the solder land should remain floating or be connected to gnd. fig 5. pin configuration so16, tssop16 fig 6. pin configuration dhvqfn16 $ + & |