74ACT244 Datasheet, PDF (4/9 Pages) STMicroelectronics – OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED

74ACT244
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns)
Symb ol
Parameter
t_PLH Propagation Delay Time
t_PHL
t_PZL Output Enable Time
t_PZH
t_PLZ Output Disable Time
t_PHZ
(*) Voltage range is 5V ± 0.5V
T est Con ditio n
V_CC
(V)
5.0^(*)
5.0^(*)
5.0^(*)
Valu e
T_A = 25 ^oC
-40 to 85 ^oC
Min. T yp. Max. Min. Max.
1.5 4.5 9.0 1.5 10.0
Unit
ns
1.5 5.5 9.0 1.5 10.0 ns
1.5 6.5 10.0 1.5 11.0 ns
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
Test Conditions
VCC
(V)
Valu e
TA = 25 ^oC
-40 to 85 ^oC
Min. T yp. Max. Min. Max.
Unit
C_IN Input Capacitance
5.0
4
pF
C_i/o I/O Capacitance
5.0
8
pF
C_PD Power Dissipation
5.0
Capacitance (note 1)
24
pF
1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/n (per circuit)
TEST CIRCUIT
TEST
t_PLH, t_PHL
t_PZL, t_PLZ
t_PZH, t_PHZ
CL = 50 pF or equivalent (includes jigand probe capacitance)
RL = R1 = 500Ω orequivalent
RT = ZOUT of pulse generator (typically 50Ω)
4/9
SW IT CH
Open
2V_CC
Open