NTE74123 Integrated Circuit TTL Retriggerable Monostable Multivibrator with Clear Description: The NTE74123 is a retriggerable monostable multivibrator in a 16Lead plastic DIP type package that features output pulse width control by three methods. The basic pulse time is programmed by selection of external resistance and capacitance values. Once triggered, the basic pulse width may be extended by retriggering the gated lowlevelactive (A) or highlevelactive (B) inputs, or be reduced by use of the overriding clear. Features: Overriding Clear Terminates Output Pulse Compensated for V and Temperature Variations CC DC Triggered from Active HIGH Transition or ActiveLOW Transition Inputs DC Retriggerable from Active High or Active Low Gated Logic Inputs Retriggerable for Very Long Output Pulses, up to 100% Duty Cycle Recommended Operating Conditions: Parameter Symbol Min Typ Max Unit Supply Voltage V 4.75 5.0 5.25 V CC HighLevel Output Current I 800 A OH LowLevel Output Current I 16 mA OL Pulse Width t 40 ns w External Timing Resistance R 5 50 k ext External Capacitance C No Restriction ext Wiring Capacitance at R /C Terminal 50 pF ext ext Operating Temperature Range T 0 +70 C AElectrical Characteristics: (Note 2, Note 3) Parameter Symbol Test Conditions Min Typ Max Unit High Level Input Voltage V 2 V IH Low Level Input Voltage V 0.8 V IL Input Clamp Voltage V V = MIN, I = 12mA 1.5 V IK CC I High Level Output Voltage V V = MIN, V = MAX, V = 2V, I = -800A 2.4 3.4 V OH CC IL IH OH Low Level Output Voltage V V = MIN, V = 2V, V = MAX, I = 16mA 0.2 0.4 V OL CC IH IL OL Input Current I V = MAX, V = 5.5V 1 mA I CC I High Level Input Current I V = MAX, V = 2.4V Data Inputs 40 A IH CC I Clear Inputs 80 A Low Level Input Current I V = MAX, V = 0.4V Data Inputs 1.6 A IL CC I Clear Inputs 3.2 A ShortCircuit Output Current I V = MAX, Note 4 10 40 mA OS CC Supply Current I V = MAX, Note 5 46 66 mA CC CC Note 2. .For conditions shown as MIN or MAX, use the appropriate value specified under Recommended Operation Conditions. Note 3. All typical values are at V = 5V, T = +25C. CC A Note 4. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. Note 5. With all outputs open and 4.5V applied to all data and clear inputs, I is measured after a CC momentary GND, then 4.5V is applied to clock. Switching Characteristics: (V = 5V, T = +25C unless otherwise specified) CC A Parameter Symbol Test Conditions Min Typ Max Unit Propagation Delay Time (From A Input to Q Output) t 22 33 ns C = 0, R = 5k, PLH ext ext R = 400, C = 15pF L L (From B Input to Q Output) 19 28 ns (From A Input to Q Output) t 30 40 ns PHL (From B Input to Q Output) 27 36 ns Propagation Delay Time (From Clear Input to Q Output) t 18 27 ns PLH (From Clear Input to Q Output) t 30 40 ns PHL Pulse Width (From A or B Input to Q Output) t (min) 45 65 ns wQ Pulse Width (From A or B Input to Q Output) t C = 1000pF, R = 10k, 2.76 3.03 3.37 s wQ ext ext R = 400, C = 15pF L L Typical Application Data: The output pulse t is a function of the external components, C and R For values of C 1000pF, W ext int ext the output pulse at V = 5V and V = 5V is given by: CC RC t = K R C where K is nominally 0.45 W ext ext If C is in pF and R is in k then t is in nanoseconds. ext ext W The C terminal is an internal connection to GND, however for the best system performance C should ext ext be hardwired to GND.