CD74HCT242 Datasheet, PDF (5/7 Pages) Texas Instruments – High Speed CMOS Logic Quad-Bus Transceiver with Three-State Outputs

CD74HCT242, CD74HC243, CD74HCT243
Switching Specifications Input t_r, t_f = 6ns
PARAMETER
HC TYPES
Propagation Delay Data
to Outputs (HC243)
TEST
SYMBOL CONDITIONS V_CC (V)
t_PLH, t_PHL C_L = 50pF
2
4.5
25^oC
TYP MAX
-40^oC TO 85^oC -55^oC TO 125^oC
MAX
MAX
UNITS
-
90
115
-
18
23
135
ns
27
ns
C_L = 15pF
5
7
-
-
CL = 50pF
6
-
15
20
-
ns
23
ns
Output High-Z, to High Level t_PZL, t_PZH C_L = 50pF
2
-
150
190
to Low Level
CL = 50pF
4.5
-
30
38
225
ns
45
ns
CL = 15pF
5
12
-
-
-
ns
CL = 50pF
6
-
26
33
38
ns
Output High Level,
t_PHZ, t_PLZ C_L = 50pF
2
-
150
190
Output Low Level to High-Z
CL = 50pF
4.5
-
30
38
225
ns
45
ns
CL = 15pF
5
12
-
-
-
ns
CL = 50pF
6
-
26
33
38
ns
Output Transition Times
t_TLH, t_THL C_L = 50pF
2
-
60
75
4.5
-
12
15
90
ns
18
ns
6
-
10
13
15
ns
Input Capacitance
Three-State Output
Capacitance
C_I
-
-
-
10
10
C_O
-
-
-
20
20
10
pF
20
pF
Power Dissipation
C_PD
-
5
80
-
-
Capacitance (HC243)
(Notes 5, 6)
-
pF
HCT TYPES
Propagation Delay Data to
t_PLH, t_PHL C_L = 50pF
4.5
-
20
25
Outputs (HCT242)
C_L = 15pF
5
8
-
-
Propagation Delay Data to
t_PLH, t_PHL C_L = 50pF
4.5
-
22
28
Outputs (HCT243)
C_L = 15pF
5
9
-
-
Output High-Z to High Level t_PZH, t_PZL C_L = 50pF
4.5
-
34
43
to Low Level
C_L = 15pF
5
14
-
-
Output High Level,
t_PHZ, t_PLZ C_L = 50pF
4.5
-
35
44
Output Low Level to High-Z
C_L = 15pF
5
14
-
-
Output Transition Times
t_TLH, t_THL C_L = 50pF
4.5
-
12
15
Input Capacitance
C_I
-
-
-
10
10
Three-State Output
Capacitance
C_O
-
-
-
20
20
30
ns
-
ns
33
ns
-
ns
51
ns
-
ns
53
ns
-
ns
18
ns
10
pF
20
pF
Power Dissipation
Capacitance
(Notes 5, 6)
C_PD
HCT242
5
90
-
-
HCT243
5
91
-
-
-
pF
-
pF
NOTES:
5. C_PD is used to determine the dynamic power consumption, per channel.
6. P_D = V_CC2 f_i (C_PD + C_L) where f_i = Input Frequency, f_O = Output Frequency, C_L = Output Load Capacitance, V_CC = Supply Voltage.
5