Datasheet

SN54AHC138, SN74AHC138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SCLS258L − DECEMBER 1995 − REVISED JULY 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO LOAD
T
A
= 25°C SN54AHC138 SN74AHC138
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
PLH
ABC
Any Y
C 15 pF
5.7* 8.1* 1* 9.5* 1 9.5
ns
t
PHL
A, B, C Any Y C
L
= 15 pF
5.7* 8.1* 1* 9.5* 1 9.5
ns
t
PLH
G1
Any Y
C 15 pF
5.6* 8.1* 1* 9.5* 1 9.5
ns
t
PHL
G1 Any Y C
L
= 15 pF
5.6* 8.1* 1* 9.5* 1 9.5
ns
t
PLH
G2A G2B
Any Y
C 15 pF
5.8* 8.1* 1* 9.5* 1 9.5
ns
t
PHL
G2A, G2B
Any Y C
L
= 15 pF
5.8* 8.1* 1* 9.5* 1 9.5
ns
t
PLH
ABC
Any Y
C 50 pF
7.2 10.1 1 11.5 1 11.5
ns
t
PHL
A, B, C Any Y C
L
= 50 pF
7.2 10.1 1 11.5 1 11.5
ns
t
PLH
G1
Any Y
C 50 pF
7.1 10.1 1 11.5 1 11.5
ns
t
PHL
G1 Any Y C
L
= 50 pF
7.1 10.1 1 11.5 1 11.5
ns
t
PLH
G2A G2B
Any Y
C =50pF
7.3 10.1 1 11.5 1 11.5
ns
t
PHL
G2A, G2B
Any Y C
L
= 50 pF
7.3 10.1 1 11.5 1 11.5
ns
*
On products compliant to MIL-PRF-38535, this parameter is not production tested.
operating characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
pd
Power dissipation capacitance No load, f = 1 MHz 13 pF