The MC14541B programmable timer consists of a 16-stage binary counter, an integrated oscillator for use with an external capacitor and two resistors, an automatic power-on reset circuit, and output control logic.
Timing is initialized by turning on power, whereupon the power-on reset is enabled and initializes the counter, within the specified V
range. With the power already on, an external reset pulse can be applied. Upon release of the initial reset command, the oscillator will oscillate with a frequency determined by the external RC network. The 16-stage counter divides the oscillator frequency (f
with the n
stage frequency being f
/2
.

• Available Outputs 2
• , 2
• , 2
• or 2
• Increments on Positive Edge Clock Transitions
• Built-in Low Power RC Oscillator (+/- 2% accuracy over temperature range and +/- 20% supply and +/- 3% over processing at
• Oscillator May Be Bypassed if External Clock Is Available (Apply external clock to Pin 3)
• External Master Reset Totally Independent of Automatic Reset Operation
• Operates as 2
• Frequency Divider or Single Transition Timer
• Q/Qbar Select Provides Output Logic Level Flexibility
• Reset (auto or master) Disables Oscillator During Resetting to Provide No Active Power Dissapation
• Clock Conditioning Circuit Permits Operation with Very Slow Clock Rise and Fall Times
• Automatic Reset Initializes All Counters On Power Up
• Supply Voltage Range = 3.0 Vdc to 18 Vdc with Auto Reset Disabled (Pin 5 = V
• )
• 8.5 Vdc to 18 Vdc with Auto Reset Enabled (Pin 5 = V
• )
• Pb-Free Packages are Available*