MC14516BFL1 Просмотр технического описания (PDF) - ON Semiconductor
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MC14516BFL1 Datasheet PDF : 12 Pages
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MC14516B
TOGGLE FLIP–FLOP
PARALLEL IN
PE P Q
C
TQ
CARRY IN OR
UP/DOWN
tsu
50%
trem
th
CLOCK
PRESET ENABLE
Q0 OR CARRY OUT
50%
tw(H)
tw(H)
90%
10%
CARRY OUT ONLY
RESET
tTHL
50%
tw
tPLH
trem
FLIP–FLOP FUNCTIONAL TRUTH TABLE
Preset
Enable
1
Clock
X
T
Qn+1
X
Parallel In
0
0
Qn
0
1
Qn
0
X
Qn
X = Don’t Care
1
fcl
VDD
VSS
VDD
VSS
VDD
VSS
tTLH
90%
VOH
10%
VOL
tPHL
tPLH
VDD
VSS
Figure 2. Switching Time Waveforms
PIN DESCRIPTIONS
INPUTS
P0, P1, P2, P3, Preset Inputs (Pins 4, 12, 13, 3) — Data
on these inputs is loaded into the counter when PE is taken
high.
Carry In, (Pin 5) — This active–low input is used when
Cascading stages. Carry In is usually connected to Carry Out
of the previous stage. While high, Clock is inhibited.
Clock, (Pin 15) — Binary data is incremented or
decremented, depending on the direction of count, on the
positive transition of this input.
OUTPUTS
Q0, Q1, Q2, Q3, Binary outputs (Pins 6, 11, 14, 2) —
Binary data is present on these outputs with Q0
corresponding to the least significant bit.
Carry Out, (Pin 7) — Used when cascading stages, Carry
Out is usually connected to Carry In of the next stage. This
synchronous output is active low and may also be used to
indicate terminal count.
CONTROLS
PE, Preset Enable, (Pin 1) — Asynchronously loads data
on the Preset Inputs. This pin is active high and inhibits the
clock when high.
R, Reset, (Pin 9) — Asynchronously resets the Q out–
puts to a low state. This pin is active high and inhibits the
clock when high.
Up/Down, (Pin 10) — Controls the direction of count,
high for up count, low for down count.
SUPPLY PINS
VSS, Negative Supply Voltage, (Pin 8) — This pin is
usually connected to ground.
VDD, Positive Supply Voltage, (Pin 16) — This pin is
connected to a positive supply voltage ranging from 3.0
volts to 18.0 volts.
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