74F779 Ver la hoja de datos (PDF) - Philips Electronics
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74F779 Datasheet PDF : 12 Pages
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Philips Semiconductors
8-bit bidirectional binary counter (3-State)
Product specification
74F779
AC SETUP REQUIREMENTS
SYMBOL
PARAMETER
ts(H)
ts(L)
th(H)
th(L)
ts(H)
ts(L)
th(H)
th(L)
ts(H)
ts(L)
th(H)
th(L)
tw(H)
tw(L)
Setup time, High or Low
I/On to CP
Hold time, High or Low
I/On to CP
Setup time, High or Low
CET to CP
Hold time, High or Low
CET to CP
Setup time, High or Low
Sn to CP
Hold time, High or Low
Sn to CP
CP Pulse width,
High or Low
TEST CONDITIONS
Waveform 3
Waveform 3
Waveform 3
Waveform 3
Waveform 3
Waveform 3
Waveform 1
LIMITS
Tamb = +25°C
VCC = +5V
CL = 50pF, RL = 500Ω
MIN
TYP MAX
Tamb = 0°C to +70°C
VCC = +5V ± 10%
CL = 50pF, RL = 500Ω
MIN
MAX
5.0
5.0
5.0
5.0
1.0
1.0
1.0
1.0
5.0
5.0
5.5
6.0
0
0
0
0
8.0
8.5
8.0
8.5
0
0
0
0
4.0
4.0
4.0
4.0
AC WAVEFORMS
For all waveforms, VM = 1.5V.
The shaded areas indicate when the input is permitted to change for predictable output performance.
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
1/fMAX
CP
I/On
TC
VM
tW(H)
tPLH
VM
tPHL
VM
tW(L)
VM
tPHL
VM
tPLH
VM
SF01263
Waveform 1. Propagation Delay, Clock Input to Output,
Clock Pulse Width, and Maximum Clock Frequency
CET
TC
VM
VM
tPHL
VM
tPLH
VM
Sn, I/On,
CET
VM
VM
ts(H) th(H)
VM
VM
ts(L) th(L)
CP
VM
VM
SF01265
Waveform 3. Data Setup and Hold Times
OE
VM
tPZH
VM
tPHZ
VOH -0.3V
I/On
VM
0V
SF01266
Waveform 4. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
SF01264
Waveform 2. Propagation Delay CET Input to
Terminal Count Output
OE
I/On
VM
tPZL
VM
VM
tPLZ
3.5V
VOL +0.3V
SF01267
Waveform 5. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
1989 Sep 20
7
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