HD74CBT3257 Datasheet, PDF (8/13 Pages) Hitachi Semiconductor – 4-bit 1-of-2 FET Multiplexer / Demultiplexer

HD74CBT3257
Switching Characteristics
(Ta = −40 to 85°C)
• V_CC = 4.0 V
Item
Propagation delay
time ^*1
Propagation delay
time
Enable time
Disable time
Symbol
t
PLH
t
PHL
t_PLH
t_PHL
t_ZH
t_ZL
t
HZ
t_LZ
Min








Max
0.35
5.5
5.7
5.6
5.2
5.5
5.2
6.4
Unit
ns
ns
ns
ns
Test
conditions
C = 50 pF
L
R
L
=
500
Ω
C_L = 50 pF
R_L = 500 Ω
C_L = 50 pF
R_L = 500 Ω
C = 50 pF
L
R_L = 500 Ω
FROM
(Input)
A or B
S
S
OE
S
OE
S
OE
TO
(Output)
B or A
A
B
A or B
B
A or B
B
A or B
• V_CC = 5.0±0.5 V
Item
Symbol Min
Test
FROM
TO
Max
Unit conditions (Input) (Output)
Propagation delay t
PLH
time ^*1
t_PHL
Propagation delay
t_PLH
time
t
PHL
Enable time
t_ZH
t_ZL

0.25
ns
C = 50 pF A or B
B or A
L
R_L = 500 Ω
1.6
5.0
ns
C_L = 50 pF
S
A
R
L
=
500
Ω
1.6
5.2
ns
C_L = 50 pF
S
1.8
5.1
R_L = 500 Ω
OE
B
A or B
Disable time
t_HZ
1.0
5.0
ns
C_L = 50 pF
S
B
2.2
5.5
R_L = 500 Ω
OE
A or B
t_LZ
1.0
5.0
2.2
6.8
S
B
OE
A or B
Note: 1. The propagation delay is the calculated RC time constant of the typical on-state resistance of the
switch and the specified load capacitance, when driven by an ideal voltage source (zero output
impedance).
Rev.2, Nov. 2001, page 6 of 11