74F244 查看數據表（PDF） - Philips Electronics
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74F244 Datasheet PDF : 12 Pages
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Philips Semiconductors
Octal buffers (3-State)
Product specification
74F244/74F244B
AC ELECTRICAL CHARACTERISTICS FOR 74F244
SYMBOL
PARAMETER
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Propagation delay
Ian, Ibn to Yn
Output enable time
to high or low
Output disable time
from high or low
TEST
CONDITION
Waveform 1
Waveform 2
Waveform 4
Waveform 2
Waveform 4
Tamb = +25°C
VCC = +5.0V
CL = 50pF,
RL = 500Ω
MIN TYP MAX
2.5 4.0 5.2
2.5 4.0 5.2
2.0 4.3 5.7
2.0 5.0 7.0
1.5 2.5 5.5
1.5 2.5 5.5
A PORT LIMITS
Tamb = 0°C to +70°C
VCC = +5.0V ± 10%
CL = 50pF,
RL = 500Ω
MIN
MAX
2.0
6.2
2.0
6.5
2.0
6.7
2.0
8.0
1.0
6.0
1.0
5.5
Tamb = -40°C to +85°C
VCC = +5.0V ± 10%
CL = 50pF,
RL = 500Ω
MIN
MAX
UNIT
1.5
2.0
7.0
7.0
ns
2.0
2.0
8.0
8.5
ns
1.0
1.0
6.0
5.5
ns
AC ELECTRICAL CHARACTERISTICS FOR 74F244B
SYMBOL
PARAMETER
TEST
CONDITION
LIMITS
Tamb = +25°C
VCC = +5.0V
CL = 50pF, RL = 500Ω
Tamb = 0°C to +70°C
VCC = +5.0V ± 10%
CL = 50pF, RL = 500Ω
MIN TYP MAX
MIN
MAX
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tsk(0)
Propagation delay
Ian, Ibn to Yn
Output enable time
to high or low level
Output disable time
from high or low level
Output skew1, 2
Waveform 1
2.5 4.5
2.5 4.5
5.7
6.0
2.0
2.5
6.2
6.5
Waveform 2
2.0 4.0
6.0
2.0
6.5
Waveform 4
3.0 5.5
7.5
3.0
8.0
Waveform 2
1.5 2.5
5.5
1.0
6.0
Waveform 4
1.5 2.5
5.5
1.0
5.5
Waveform 3
1.5
2.0
NOTES:
1. |tPN actual - tPM actual| for any output compared to any other output where N and M are either LH or HL.
2. Skew times are valid only under same test conditions (temperature, VCC, loading, etc.,).
UNIT
ns
ns
ns
ns
1994 Dec 5
6
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