SL4541BD データシートの表示（PDF） - System Logic Semiconductor

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SL4541BD

Programmable Timer

System Logic Semiconductor 

SL4541B

Programmable Timer

High-Performance Silicon-Gate CMOS

The SL4541 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

transitons and can also be reset via the MASTER RESET input.

The output from this timer is the Q or not Q output from the 8th,

10th, 13th, or 16th counter stage. The desired stage is chosen using

time-select inputs A and B. The output is available in either of two

modes selectable via the MODE input, pin 10. 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

ORDERING INFORMATION

SL4541BN Plastic

SL4541BD SOIC

TA = -55° to 125° C for all packages

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 untill 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, VCC should be

greater than 5V.

• Operating Voltage Range: 3.0 to 18 V

• Maximum input current of 1 µA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C

• Noise margin (over full package temperature range):

1.0 V min @ 5.0 V supply

2.0 V min @ 10.0 V supply

2.5 V min @ 15.0 V supply

LOGIC DIAGRAM

PIN ASSIGNMENT

PIN 14 =VCC

PIN 7 = GND

PINS 4,11 = NO CONNECTION

SLS

System Logic

Semiconductor

NC = NO CONNECTION

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