TC342 ETC | Alldatasheet
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—JER TELA Dual Monostable Multivibrator
580 Pleasant Street
(817) 924-9280 Features General Description @ COMPLEMENTARY OUTPUT PULSES The 342 provides two one-shots that can be independently @ OUTPUT WIDTH INDEPENDENT OF TRIGGER triggered and timed. Output pulse widths are timed by an ex PULSE WIDTH ternal capacitor, making them independent of the input trigge- = Segatepcipcettl Le acorns 52 pulse widths. Expander inputs and complementary, active pull- © ON CHIP TIMING RESISTORS up outputs are provided, Applications include generation of @ EXPANDER INPUTS stable contro! pulses as long as several seconds from short data @ ACTIVE PULLUP pulses. Logic Diagrams oo am nn me ae 64 + a St Gao -s8 oe on ont tual} veges act gtd (<4 sees Equivalent Circuit a oo bend jae | ig of | } k Y = ool 2 ee i xo ee 3-33
Dual Monostable Multivibrator 342, Specifications 342 [tcc WORST-CASE) | 17 mA @ 13V. 23mA@ I6V | toe toes at Voge +1 Volt (+13¥ for C type and +16 for A TYDE) ane Mt QuETENIEED across The epplicEDie Teme range. WO He guarenwed at Vor 21V and across the applicette temp Smpegs it tor coated sommmery datas Switching Time Waveforms eae ae oom H D verona ff : wero be = Loading Table 342 [pins [Function [toapinc jce Timing network NA x Expanders Each diode tied to X1 or X2 is 1 unit !oad. ao Outputs 5UL Typical Performance Characteristics INPUT CURRENT OUTPUT CURRENT VS OUTPUT VOLTAGE va VS. INPUT VOLTAGE OUTPUT HIGH OUTPUT LOW “e " an nd A Sle " D law | ~t tS Pty Ty OZ ie +s CO Jip [) -crr |=6(ELT (SE. Beet... abe eee Cee a a —S aE 3-34
Dual Monostable Multivibrator 342 Typical licati 'ypical, Applications PULSE WIDTH DETECTOR ‘The 342 is triggered on the riting edge of a trigge: pulse applied to an A or X input. It is not retriggerable until acycle time of Py + TR has elapsed where Py is output pulse width aorea and TR is the recovery time. y B ot Py 2 0.7 RC. C is a capacitor externally connected betweer ma |) pins Cand D, R may be the 20 kilohm resistor in the ove-shet, : sd used by shorting pins OD and E together. This resistor is a dit- fused resistor with a tolerance of 230% at 25°C. For critical B timing applications, a precision resistor of 2 to 62 kilohms should be connected from Voc to pin D. The external resistor site range allows @ timing range from 200 nanoseconds to — J | | | i several seconds. Tr = XC in nanoseconds, with C in picofarads. This is the . l J | J | recovery time required for the circuit to charge C to 99% of its final value. TR must be considered when calculating the allow . J | J | j | able duty cycle. Any desired number of trigger input: may be ANDed by adding be fj t__—___F L— 331 gate expanders or 1N914 diodes (or any 20-volt silicon diodes) to the expander inputs. batetstd l J | J Oniy pulses shorter then @ minimum produce an oumut oulse, ONE-SHOT WITH LONG PULSE WIDTH iry ‘ec 5 1aNEe AaKURE i. \\ : (ONT fe > ait PLE LIN me CAR, NTT ON EET 3 ie | EN aE ae urevy nat more - see A tlc-eftect transistor extends the time constant provided by @ small capicior, by atlowing use of a high-value resistor. If s large capacitor is 0150 used, very long Gelays can De Obtained. TACHOMETER SUL pl» 7 D = © Co a Cand R ceterming the meter reading for # given input duise rate R may be used to calibrate the meter to show rm OF Other rete of the equip: ment Deng monitored. PULSE DELAY CIRCUIT IMPROVED NOISE REDUCTION CIRCUIT, =) = imine o c ad tes TRCCIR INeUT | fl i ¥ = Recommended where excessive wooly noise ls Crevent. 3-35