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MC14536 Datenblatt(PDF) 5 Page - ON Semiconductor

Teilenummer MC14536
Bauteilbeschribung  Programmable Timer
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
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MC14536B
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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
start–up 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
Ω to 100 kΩ and the capacitor value should be limited to
a maximum of 1000 pf. (See figures 3, 4, 5, and 10).
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 8.)


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