Philips Semiconductors Product specification
74F1244Octal buffer (3-State)
1989 Apr 04
4
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
MIN TYP
2
MAX
±10% V
CC
2.5 V
p
V
CC
= MIN,
OH
= –
±5% V
CC
2.7 3.4 V
OH
-
v
u
u
v
IL
=
,
V
IH
= MIN
±10% V
CC
2.0 V
OH
= –
±5% V
CC
2.0 V
p
V
CC
= MIN,
I
OL
= 48mA ±10% V
CC
0.38 0.55 V
OL
w-
v
u
u
v
IL
=
,
V
IH
= MIN
I
OL
= 64mA ±5% V
CC
0.42 0.55 V
V
IK
Input clamp voltage V
CC
= MIN, I
I
= I
IK
–0.73 –1.2 V
I
I
Input current at maximum input voltage V
CC
= 0.0V, V
I
= 7.0V 100 µA
I
IH
High-level input current V
CC
= MAX, V
I
= 2.7V 20 µA
I
IL
Low-level input current V
CC
= MAX, V
I
= 0.5V –20 µA
I
OZH
Off-state output current,
High-level voltage applied
V
CC
= MAX, V
O
= 2.7V 50 µA
I
OZL
Off-state output current,
Low-level voltage applied
V
CC
= MAX, V
O
= 0.5V –50 µA
I
OS
Short-circuit output current
3
V
CC
= MAX –100 –225 mA
I
CCH
30 40 mA
I
CC
Supply current (total)
I
CCL
V
CC
= MAX
57 75 mA
I
CCZ
43 58 mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25°C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
OS
tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL PARAMETER
TEST
CONDITION
T
amb
= +25°C
V
CC
= +5.0V
C
L
= 50pF, R
L
= 500Ω
T
amb
= 0°C to +70°C
V
CC
= +5.0V ± 10%
C
L
= 50pF, R
L
= 500Ω
UNIT
MIN TYP MAX MIN MAX
t
PLH
t
PHL
Propagation delay
Ian, Ibn to Yn
Waveform 1
2.5
2.0
4.0
5.0
5.5
7.0
2.5
2.0
6.0
7.5
ns
ns
t
PZH
t
PZL
Output Enable time
to High or Low level
Waveform 2
Waveform 3
3.0
3.0
6.0
6.5
7.5
8.0
3.0
3.0
8.5
8.5
ns
ns
t
PHZ
t
PLZ
Output Disable time
to High or Low level
Waveform 2
Waveform 3
2.0
2.0
4.0
4.0
5.5
5.5
2.0
2.0
6.0
6.0
ns
ns
