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MC14536BDWR2G Folha de dados(PDF) 5 Page - ON Semiconductor

Nome de Peças MC14536BDWR2G
Descrição Electrónicos  Programmable Timer
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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5
PIN DESCRIPTIONS
INPUTS
SET (Pin 1) −A high on Set asynchronously forces Decode
Out to a high level. This is accomplished by setting an output
conditioning latch to a high level while at the same time
resetting the 24 flip−flop stages. After Set goes low (inactive),
the occurrence of the first negative clock transition on IN1
causes Decode Out to go low. The counter’s flip−flop stages
begin counting on the second negative clock transition of IN1.
When Set is high, the on−chip RC oscillator is disabled. This
allows for very low−power standby operation.
RESET (Pin 2) − A high on Reset asynchronously forces
Decode Out to a low level; all 24 flip−flop stages are also reset
to a low level. Like the Set input, Reset disables the on−chip
RC oscillator for standby operation.
IN1 (Pin 3) −The device’s internal counters advance on the
negative−going edge of this input. IN1 may be used as an
external clock input or used in conjunction with OUT1 and
OUT2 to form an RC oscillator. When an external clock is
used, both OUT1 and OUT2 may be left unconnected or used
to drive 1 LSTTL or several CMOS loads.
8−BYPASS (Pin 6) − A high on this input causes the first 8
flip−flop stages to be bypassed. This device essentially
becomes a 16−stage counter with all 16 stages selectable.
Selection is accomplished by the A, B, C, and D inputs. (See
the truth tables.)
CLOCK INHIBIT (Pin 7) − A high on this input
disconnects the first counter stage from the clocking source.
This holds the present count and inhibits further counting.
However, the clocking source may continue to run.
Therefore, when Clock Inhibit is brought low, no oscillator
startup time is required. When Clock Inhibit is low, the
counter will start counting on the occurrence of the first
negative edge of the clocking source at IN1.
OSC INHIBIT (Pin 14) −A high level on this pin stops the
RC oscillator which allows for very low−power standby
operation. May also be used, in conjunction with an external
clock, with essentially the same results as the Clock Inhibit
input.
MONO−IN (Pin 15) − Used as the timing pin for the
on−chip monostable multivibrator. If the Mono−In input is
connected to VSS, the monostable circuit is disabled, and
Decode Out is directly connected to the selected Q output.
The monostable circuit is enabled if a resistor is connected
between Mono−In and VDD. This resistor and the device’s
internal capacitance will determine the minimum output
pulse widths. With the addition of an external capacitor to
VSS, the pulse width range may be extended. For reliable
operation the resistor value should be limited to the range of
5 k
W to 100 kW and the capacitor value should be limited to
a maximum of 1000 pf. (See figures 4, 5, 6, and 11).
A, B, C, D (Pins 9, 10, 11, 12) − These inputs select the
flip−flop stage to be connected to Decode Out. (See the truth
tables.)
OUTPUTS
OUT1, OUT2 (Pin 4, 5) −Outputs used in conjunction with
IN1 to form an RC oscillator. These outputs are buffered and
may be used for 20 frequency division of an external clock.
DECODE OUT (Pin 13) − Output function depends on
configuration. When the monostable circuit is disabled, this
output is a 50% duty cycle square wave during free run.
TEST MODE
The test mode configuration divides the 24 flip−flop
stages into three 8−stage sections to facilitate a fast test
sequence. The test mode is enabled when 8−Bypass, Set and
Reset are at a high level. (See Figure 9.)
TRUTH TABLES
Input
Stage Selected
for Decode Out
8−Bypass
D
C
B
A
0
0
0
0
0
9
0
0
0
0
1
10
0
0
0
1
0
11
0
0
0
1
1
12
0
0
1
0
0
13
0
0
1
0
1
14
0
0
1
1
0
15
0
0
1
1
1
16
0
1
0
0
0
17
0
1
0
0
1
18
0
1
0
1
0
19
0
1
0
1
1
20
0
1
1
0
0
21
0
1
1
0
1
22
0
1
1
1
0
23
0
1
1
1
1
24
Input
Stage Selected
for Decode Out
8−Bypass
D
C
B
A
1
0
0
0
0
1
1
0
0
0
1
2
1
0
0
1
0
3
1
0
0
1
1
4
1
0
1
0
0
5
1
0
1
0
1
6
1
0
1
1
0
7
1
0
1
1
1
8
1
1
0
0
0
9
1
1
0
0
1
10
1
1
0
1
0
11
1
1
0
1
1
12
1
1
1
0
0
13
1
1
1
0
1
14
1
1
1
1
0
15
1
1
1
1
1
16


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