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MC14526BCP データシート(PDF) 7 Page - ON Semiconductor

部品番号 MC14526BCP
部品情報  Presettable 4-Bit Down Counters
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MC14526B
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PIN DESCRIPTIONS
Preset Enable (Pin 3) — If Reset is low, a high level on
the Preset Enable input asynchronously loads the counter
with the programmed values on P0, P1, P2, and P3.
Inhibit (Pin 4) — A high level on the Inhibit input pre–
vents the Clock from decrementing the counter. With Clock
(pin 6) held high, Inhibit may be used as a negative edge
clock input.
Clock (Pin 6) — The counter decrements by one for each
rising edge of Clock. See the Function Table for level
requirements on the other inputs.
Reset (Pin 10) — A high level on Reset asynchronously
forces Q0, Q1, Q2, and Q3 low and, if Cascade Feedback is
high, causes the “0” output to go high.
“0” (Pin 12) — The “0” (Zero) output issues a pulse one
clock period wide when the counter reaches terminal count
(Q0 = Q1 = Q2 = Q3 = low) if Cascade Feedback is high and
Preset Enable is low. When presetting the counter to a value
other than all zeroes, the “0” output is valid after the rising
edge of Preset Enable (when Cascade Feedback is high). See
the Function Table.
Cascade Feedback (Pin 13) — If the Cascade Feedback
input is high, a high level is generated at the “0” output when
the count is all zeroes. If Cascade Feedback is low, the “0”
output depends on the Preset Enable input level. See the
Function Table.
P0, P1, P2, P3 (Pins 5, 11, 14, 2) — These are the preset
data inputs. P0 is the LSB.
Q0, Q1, Q2, Q3 (Pins 7, 9, 15, 1) — These are the
synchronous counter outputs. Q0 is the LSB.
VSS (Pin 8) — The most negative power supply potential.
This pin is usually ground.
VDD (Pin 16) — The most positive power supply
potential. VDD may range from 3 to 18 V with respect to VSS.
STATE DIAGRAM
MC14526B
4
3
2
1
0
15
14
13
12
11
10
9
8
7
6
5


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