74122 ETC1
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Technical content
a SasS=S=025SSSSS SS 525255 54/74122 PIN CONFIGURATION DESCRIPTION FEATURES ac = 1 fa vce These retriggerable monostable multi- © DC Triggered from active HIGH or a =a A Ey ees Con vibrators feature de triggering from gated —_active LOW inputs active LOW inputs (A) and active HIGH in- © Retriggerable for very jong pulses— " Tl Puts (B) and also provide overriding direct up to 100% duty cycle Ps art [7 cont reset inputs. Complementary outputs are © Direct Reset terminates output pulse fo Ce} det ba] Provided. The retrigger capability simplifies © Compensated for Vcc and ae am a the generation of output pulses of extremely temperature variations e tong duration. By triggering the input before oo pele the output pulse is terminated, the output Pulse may be extended. The overriding reset capability permits any output pulse to be terminated at a predetermined time indepen- dently of the timing components R and C. FUNCTION TABLE t}x x}/x xfouoiou x}H H}x x]uoH x}x x{e xfoiu x x x x L L H Hye x} t fm or Hie x tH ft lroour Hix tf] t H#ieir H x L H t at. ORDERING CODE (See Section 9 for further Package and Ordering Information) HyH 4 | HH fm ir H + + H H fs. ou COMMERCIAL RANGES MILITARY RANGES H}) Hi H HH] oar PACKAGES Voc=5¥ 25%; Tano% to 470°C Vo=5V: 10%; Ta=-S5°C to +125°C fu x ]H ow [roo p]x ouclH 4m ir Plastic DIP N7a12EN fe H= HGH vottage level [cwwmcow | erene | coeur xara X= Dos't care { = LOW-to-HIGH input transition {= H4GH10-LOW input transition ee JL = Aetive HGH pulse “LU = Active LOW pulse INPUT AND OUTPUT LOADING AND FAN-OUT TABLE) PINS DESCRIPTION 548/748 | 54LS/74LS ee Ti GAY Ay, Be Trigger (active LOW) inputs tn tma) i ti GA) By, Bo Trigger (active HIGH) inputs na) s . a ti GA) Ap Direct Reset (active LOW) input ima) ‘ TOH GAY =800 ‘ ToH GA) =800 NOTE 4, The slashed aumbera indicate diferent parametric valves tor Miitary/ Commercial temperature ranges respectively
192 Sqyaatics
The "122" is @ retriggerable monostable multivibrator featuring output pulse width control by three methods. The basic pulse time is programmed by selection of external resistance and capacitance values (see typical application data in “123" data sheet). The “122” has an internal timing re- sistor that allows the circuit to be used with only an extemal capacitor, if 80 desired. Once triggered, the basic pulse width may be extended by retriggering the gated ac- tive LOW going edge inputs (Ay, Az) or the active HIGH going edge inputs (By, Bg), or be reduced by use of the overriding active LOW Reset. To use the internal timing resistor of the "122" connect Rint to Voc. For improved pulse width accuracy and repeatability, con- nect an external resistor between Rext/Cext and Voc with Rint left open. To obtain variable pulse widths, connect an ex- ternal variable resistance between Rint oF Rext/Cext and Voc. DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE”) S4LS/7418 oe Tesr CompITONS [in [ max [win [ Max | in | Max | UN lec_ Suppl eure | vec=mex | fe] | ff fm | AC CHARACTERISTICS: T,=25°C (See Section 4 for Test Circuits and Conditions) Cy = 15pF tpLH Propagation delay Figure 1 tpHL A input to Q & © output Cext = OPF, Rext = 5k tpLH Propagation delay B Figure 2 28 tpHL input to Q & output Coxt = OPF, Rext = Sk 36 tPLH Propagation delay Rip Figure 3 40 tPHL input to © & Q output Cext = OPF, Rext = 6k2 27 Figures 1 & 2 twQ Minimum Q pulse width Cena = ODF, Regt = 5k Figures 1&2 ‘wo _Ouputpuise wich ‘eattiattogsfe~| | | | f=! ores . For tamiy de charactritice, see inside front cover for §4/74 and 54H/74H, and seo inside back cover for 45/748 and 54L5/74LS specications Sqqnetics 193
. ee SSeS SSeS SS ee eS eee AC SETUP REQUIREMENTS: Ta = 25°C (See Section 4 for Test Circuits and Conditions) PARAMETER TEST CON TIONS [nT wax [tn wax | in [wax | OT | com [so | so Pe | External timing a No fiestaIcrion | | [| Stray capacitance to GND CRRICX at Rext/Cext terminal PT ff Tey AC WAVEFORMS PROPAGATION DELAY A INPUT TO Q AND G OUTPUTS, PROPAGATION DELAY B INPUT TO Q AND G OUTPUT, AND INPUT AND OUTPUT PULSE WIDTHS AND INPUT AND OUTPUT PULSE WIDTHS. ow w | . ww vu
3 X ww 7 vu
ow — -——— wus un |] e ww i ° ™ a to w ——| as a vw “ 3 ww vw Vxa = 1 5V for 64/74 and 548/748; Vy = 1.3V for 54LS 7415 Vid = 1.5V for 54/74 ond 545/748: Vig = 1.9V for S4LS/741S Figure 1 Figure 2 DIRECT RESET DELAYS AND RECOVERY TIME. ; ve wee w » vm vy Ge tou 3 FE Vig = 1.5V for 54/74 and 548/748; Vag = 1.39 for SALS/74LS Figure 3