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SL4541B Datasheet(PDF) 1 Page - System Logic Semiconductor

Part # SL4541B
Description  Programmable Timer
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Manufacturer  SLS [System Logic Semiconductor]
Direct Link  http://www.slsemicon.co.kr/e_index.htm
Logo SLS - System Logic Semiconductor

SL4541B Datasheet(HTML) 1 Page - System Logic Semiconductor

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SL4541B
System Logic
Semiconductor
SLS
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 2
N. 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 2
N-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 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
ORDERING INFORMATION
SL4541BN Plastic
SL4541BD SOIC
TA = -55
° to 125° C for all packages
PIN ASSIGNMENT
NC = NO CONNECTION
LOGIC DIAGRAM
PIN 14 =VCC
PIN 7 = GND
PINS 4,11 = NO CONNECTION


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