Texas Instruments CD4541BF3A
- Part Number:
- CD4541BF3A
- Manufacturer:
- Texas Instruments
- Ventron No:
- 6370501-CD4541BF3A
- Description:
- CMOS Programmable Timer - High Voltage Type (20V Rating)
- Datasheet:
- cd4541b-mil
- Technology familyCD4000
- Bits (#)1
- Supply voltage (min) (V)4.75
- Supply voltage (max) (V)5.25
- Input typeStandard CMOS
- Output typePush-Pull
- Supply current (max) (μA)100
- IOL (max) (mA)4
- IOH (max) (mA)-4
- Operating temperature range (°C)-55 to 125
- RatingMilitary
CD4541B programmable timer consists of a 16-stage binary counter, an oscillator that is controlled by external R-C components (2 resistors and a capacitor), an automatic power-on reset circuit, and output control logic. The counter increments on positive-edge clock transitions and can also be reset via the MASTER RESET input.
The output from this timer is the Q or Q\ output from the 8th, 10th, 13th, or 16th counter stage. The desired stage is chosen using time-select inputs A and B (see Frequency Select Table).
The output is available in either of two modes selectable via the MODE input, pin 10 (see Truth Table). When this MODE input is a logic "1", the output will be a continuous square wave having a frequency equal to the oscillator frequency divided by 2N. With the MODE input set to logic "0" and after a MASTER RESET is initiated, the output (assuming Q output has been selected) changes from a low to a high state after 2N-1 counts and remains in that state until another MASTER RESET pulse is applied or the MODE input is set to a logic "1".
Timing is initialized by setting the AUTO RESET input (pin 5) to logic "0" and turning power on. If pin 5 is set to logic "1", the AUTO RESET circuit is disabled and counting will not start until after a positive MASTER RESET pulse is applied and returns to a low level. The AUTO RESET consumes an appreciable amount of power and should not be used if low-power operation is desired. For reliable automatic power-on reset, VDD should be greater than 5V.
The RC oscillator, shown in Figure 2, oscillates with a frequency determined by the RC network and is calculated using:
Where f is between 1kHz and 100kHz and RS and 2RTC.
Programmable Timer Single -55°C 125°C 14-Pin CDIP Tube
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