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Clock & Timing
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Programmable Timer Single 14-Pin SOIC N T/R
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Maximum Low Level Output Current:
Number of Internal Timers:
Maximum Quiescent Current:
Tape and Reel
Maximum High Level Output Current:
8.75(Max) x 4(Max) x 1.5(Max)mm
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The CD4541BC Programmable Timer is designed with a 16-stage binary counter, an integrated oscillator for use with an external capacitor and two resistors, output control logic, and a special power-on reset circuit. The special features of the power-on reset circuit are first, no additional static power consumption and second, the part functions across the full voltage range (3V-15V) whether power-on reset is enabled or disabled.
Timing and the counter are initialized by turning on power, if the power-on reset is enabled. When the power is already on, an external reset pulse will also initialize the timing and counter. After either reset is accomplished, the oscillator frequency is determined by the external RC network. The 16-stage counter divides the oscillator frequency by any of 4 digitally controlled division ratios
Available division ratios 2
, or 2
Increments on positive edge clock transitions
Built-in low power RC oscillator (±2% accuracy over temperature range and ±10% supply and ±3% over processing @ < 10 kHz)
Oscillator frequency range is approximately equal to DC to 100 kHz
Oscillator may be bypassed if external clock is available (apply external clock to pin 3)
Automatic reset initializes all counters when power turns on
External master reset totally independent of automatic reset operation
Operates at 2
frequency divider or single transition timer
Q/Q# select provides output logic level flexibility
Reset (auto or master) disables oscillator during resetting to provide no active power dissipation
Clock conditioning circuit permits operation with very slow clock rise and fall times
Wide supply voltage range-3.0V to 15V
High noise immunity-0.45 V
5V-10V-15V parameter ratings
Symmetrical output characteristics
Maximum input leakage 1 µA at 15V over full temperature range
High output drive (pin 8) min. one TTL load
PART CLASSIFICATION DATA
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