Datasheet

5
Switching Specifications Input t
r
, t
f
= 6ns
PARAMETER SYMBOL
TEST
CONDITIONS V
CC
(V)
25
o
C -40
o
C TO 85
o
C -55
o
C TO 125
o
C
UNITSTYP MAX MAX MAX
HC TYPES
Propagation Delay
In to Y
t
PLH
, t
PHL
C
L
= 50pF 2 - 150 190 225 ns
4.5 - 30 38 45 ns
C
L
= 15pF 5 12 - - - ns
CL = 50pF 6 - 26 33 38 ns
Propagation Delay
S to Y
t
PLH
, t
PHL
C
L
= 50pF 2 - 175 220 265 ns
4.5 - 35 44 53 ns
C
L
= 15pF 5 14 - - - ns
CL = 50pF 6 - 30 37 45 ns
Propagation Delay
OE to Y
t
PLZ
, t
PHZ
,
t
PZL
, t
PZH
CL = 50pF 2 - 150 190 225 ns
C
L
= 50pF 4.5 - 30 38 45 ns
C
L
= 15pF 5 12 - - - ns
CL = 50pF 6 - 26 33 38 ns
Output Transition Times t
TLH
, t
THL
C
L
= 50pF 2 - 60 75 90 ns
4.5 - 12 15 18 ns
6 - 10 13 15 ns
Input Capacitance C
I
---1010 10pF
Three-State Output
Capacitance
C
O
---2020 20pF
Power Dissipation
Capacitance
(Notes 3, 4)
C
PD
- 5 45 - - - pF
HCT TYPES
Propagation Delay
In to Y
t
PLH
, t
PHL
C
L
= 50pF 4.5 - 33 41 50 ns
C
L
= 15pF 5 13 - - - ns
Propagation Delay
S to Y
t
PZL,
t
PZH
C
L
= 50pF 4.5 - 38 48 57 ns
C
L
= 15pF 5 12 - - - ns
Propagation Delay
OE to Y
t
PLZ
, t
PHZ
C
L
= 50pF 4.5 - 30 38 45 ns
C
L
= 15pF 5 16 - - - ns
Output Transition Times t
TLH
, t
THL
C
L
= 50pF 4.5 - 12 15 18 ns
Input Capacitance C
I
---1010 10pF
Three-State Output
Capacitance
C
O
---2020 20pF
Power Dissipation
Capacitance
(Notes 3, 4)
C
PD
- 5 45 - - - pF
NOTES:
3. C
PD
is used to determine the dynamic power consumption, per multiplexer.
4. P
D
= V
CC
2
f
i
(C
PD
+ C
L
) where f
i
= Input Frequency, C
L
= Output Load Capacitance, V
CC
= Supply Voltage.
CD54HC257, CD74HC257, CD54HCT257, CD74HCT257