Datasheet

SN54AHCT138, SN74AHCT138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SCLS266M − DECEMBER 1995 − REVISED JULY 2003
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
V
T
A
= 25°C SN54AHCT138 SN74AHCT138
UNIT
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
V
I
OH
= −50 mA
45V
4.4 4.5 4.4 4.4
V
V
OH
I
OH
= −8 mA
4.5 V
3.94 3.8 3.8
V
V
I
OL
= 50 mA
45V
0.1 0.1 0.1
V
V
OL
I
OL
= 8 mA
4.5 V
0.36 0.5 0.44
V
I
I
V
I
= 5.5 V or GND 0 V to 5.5 V ±0.1 ±1* ±1 mA
I
CC
V
I
= V
CC
or GND, I
O
= 0 5.5 V 4 40 40 mA
ΔI
CC
†
One input at 3.4 V,
Other inputs at V
CC
or GND
5.5 V 1.35 1.5 1.5 mA
C
i
V
I
= V
CC
or GND 5 V 2 10 10 pF
* On products compliant to MIL-PRF-38535, this parameter is not production tested at V
CC
= 0 V.
†
This is the increase in supply current for each input at one of the specified TTL voltage levels rather than 0 V or V
CC
.
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 SN54AHCT138 SN74AHCT138
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
t
PLH
ABC
Any Y
C 15 pF
7.6* 10.4* 1* 12* 1 12
ns
t
PHL
A, B, C Any Y C
L
= 15 pF
7.6* 10.4* 1* 12* 1 12
ns
t
PLH
G1
Any Y
C 15 pF
6.6* 9.1* 1* 10.5* 1 10.5
ns
t
PHL
G1 Any Y C
L
= 15 pF
6.6* 9.1* 1* 10.5* 1 10.5
ns
t
PLH
G2A G2B
Any Y
C 15 pF
7* 9.6* 1* 11* 1 11
ns
t
PHL
G2A, G2B
Any Y C
L
= 15 pF
7* 9.6* 1* 11* 1 11
ns
t
PLH
ABC
Any Y
C 50 pF
8.1 11.4 1 13 1 13
ns
t
PHL
A, B, C Any Y C
L
= 50 pF
8.1 11.4 1 13 1 13
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
7.5 10.6 1 12 1 12
ns
t
PHL
G2A, G2B
Any Y C
L
= 50 pF
7.5 10.6 1 12 1 12
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 14 pF