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PDF HD74HC78 Data sheet ( Hoja de datos )
| Número de pieza | HD74HC78 | |
| Descripción | Dual J-K Flip-Flops | |
| Fabricantes | Renesas | |
| Logotipo |  |
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HD74HC78
Dual J-K Flip-Flops
(with Preset, Common Clear and Common Clock)
REJ03D0553-0200
(Previous ADE-205-425)
Rev.2.00
Oct 06, 2005
Description
This flip-flop is edge sensitive to the clock input and change state on the negative transition of the clock pulse. Each
flip-flop has independent J, K, and preset inputs and Q and Q outputs. Two flip-flops are controlled by a common clear
and a common clock. Preset and clear are independent of the clock and accomplished by a low logic level on the
corresponding input.
Features
• High Speed Operation: tpd (Clock to Q) = 20 ns typ (CL = 50 pF)
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 2 µA max (Ta = 25°C)
• Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HC78FPEL SOP-14 pin (JEITA)
PRSP0014DF-B
(FP-14DAV)
FP
HD74HC78RPEL SOP-14 pin (JEDEC)
PRSP0014DE-A
(FP-14DNV)
RP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
Function Table
Inputs
Outputs
Preset
Clear
Clock
J
K
Q
Q
LHX XXH L
HLXXXLH
L L X X X H*1 H*1
HH
LL
No change
HH
LHLH
HH
HLHL
HH
HH
Toggle
HH L XX
No change
HHH X X
No change
HH
XX
No change
H : High level
L : Low level
X : Irrelevant
Note: 1. Q and Q will remain High as long as Preset and Clear are Low, but Q and Q are unpredictable, if Preset and
Clear go High simultaneously.
Rev.2.00, Oct 06, 2005 page 1 of 6
1 page  
HD74HC78
Waveforms
• Waveform − 1
Clock
10 %
tr tf
90 %
50 % 50 %
tw (H)
tw (L)
10 %
tTLH
50 % 50 %
tTHL
Q or Q
Q or Q
tPLH
90 %
50 %
10 %
tPHL
50 %
10 %
90 %
50 %
tPHL
tPLH
50 %
10 %
10 %
90 %
tTHL
tTLH
VCC
0V
VOH
VOL
VOH
VOL
• Waveform − 2
Clear
Preset
Q
Q
tf tr
90 %
50 %
10 %
tw(clear)
90 %
50 %
10 %
tf
tr
tPHL
90 %
50 %
10 %
tTHL
tPLH
50 %
10 %
90 %
90 %
50 %
10 %
tw(preset)
tPLH
90 %
50 %
50 %
tPHL
50 %
tTLH
VCC
0V
VCC
0V
VOH
VOL
VOH
VOL
Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns
2. The output are measured one at a time with one transition per measurement.
Rev.2.00, Oct 06, 2005 page 5 of 6
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HD74HC78.PDF ] | |
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