74LS12 ,Dual Retriggerable One-Shot with Clear and Complementary Outputs
74LS12 ,Dual Retriggerable One-Shot with Clear and Complementary Outputs
74LS122 ,Retriggerable Monostable Multivibrators(with Clear)2SN74LS122 SN74LS123LS122 FUNCTIONAL TABLE LS123 FUNCTIONAL TABLEINPUTS OUTPUTS INPUTS OUTPUTSCLEAR ..
74LS123 ,Dual Retriggerable One-Shot with Clear and Complementary OutputsFeaturesThe DM74LS123 is a dual retriggerable monostable multi-
74LS12
Dual Retriggerable One-Shot with Clear and Complementary Outputs
RETRIGGERABLE MONOSTABLE
MUL TIVIBRATORSThese dc triggered multivibrators feature pulse width control by three meth-
ods. The basic pulse width is programmed by selection of external resistance
and capacitance values. The LS122 has an internal timing resistor that allows
the circuits to be used with only an external capacitor. Once triggered, the ba-
sic pulse width may be extended by retriggering the gated low-level-active (A)
or high-level-active (B) inputs, or be reduced by use of the overriding clear. Overriding Clear Terminates Output Pulse Compensated for VCC and Temperature Variations DC Triggered from Active-High or Active-Low Gated Logic Inputs Retriggerable for Very Long Output Pulses, up to 100% Duty Cycle Internal Timing Resistors on LS122
SN54/74LS122 (TOP VIEW)(SEE NOTES 1 THRU 4)
SN54/74LS123 (TOP VIEW)(SEE NOTES 1 THRU 4)
NOTES: An external timing capacitor may be connected between Cext and Rext/Cext (positive). To use the internal timing resistor of the LS122, connect Rint to VCC. For improved pulse width accuracy connect an external resistor between Rext/Cext and
VCC with Rint open-circuited.- - -- --- --- --- - - - - -- -- - -- - - -- " -
