Datasheet
ELECTRICAL CHARACTERISTICS
SWITCHING CHARACTERISTICS
SN54LS243 , SN74LS243
SDLS145A – APRIL 1985 – REVISED JULY 2008 .............................................................................................................................................................
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over operating free-air temperature range (unless otherwise noted)
SN54LS243 SN74LS243
PARAMETER TEST CONDITIONS
(1)
UNIT
MIN TYP
(2)
MAX MIN TYP
(2)
MAX
V
IK
A or B V
CC
= MIN, I
I
= – 18 mA – 1.5 – 1.5 V
Hysteresis (V
T+
– V
T –
) V
CC
= MIN, 0.2 0.4 0.2 0.4 V
V
IL
= MAX,
2.4 3.1 2.4 3.1 V
I
OH
= – 3 mA
V
OH
V
CC
= MIN, V
IH
= 2 V,
V
IL
= 0.5 V,
2 2
I
OH
= MAX
V
IH
= 2 V, I
OL
= 12 mA 0.25 0.4 0.25 0.4
V
CC
= MIN,
V
OL
V
V
IL
= MAX
I
OL
= 24 mA 0.35 0.5
V
CC
= MIN, V
IH
= 2 V, V
O
= 2.7 V
I
OZH
40 40 µ A
V
IL
= MAX,
V
CC
= MIN, V
IH
= 2 V, V
O
= 0.4 V
I
OZL
– 200 – 200 µ A
V
IL
= MAX,
A or B V
I
= 5.5 V 0.1 0.1
I
I
V
CC
= MAX, mA
GAB or GBA V
I
= 7 V 0.1 0.1
I
IH
V
CC
= MAX, 20 20 µ A
V
CC
= MAX, V
I
= 0.4 V,
A inputs – 0.2 – 0.2
GAB and GBA at 0 V
I
IL
V
CC
= MAX, V
I
= 0.4 V, mA
B inputs – 0.2 – 0.2
GAB and GBA at 4.5 V
GAB or GBA V
CC
= MAX, V
I
= 0.4 V, – 0.2 – 0.2
I
OS
V
CC
= MAX – 40 – 225 – 40 – 225 mA
Outputs high 22 38 22 38
Outputs low V
CC
= MAX,
29 50 29 50
I
CC
Outputs open, mA
(3)
All outputs
32 54 32 54
disabled
(1) For conditions shown as MIN or MAX, use the appropriate value specified under " recommended operating conditions. "
(2) All typical values are at V
CC
= 5 V, T
A
= 25 ° C.
(3) I
CC
is measured with transceivers eabled in one direction only, or with all transceivers disabled.
V
CC
= 5 V, T
A
= 25 ° C
SN54LS243 SN74LS243
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
t
PLH
9 14 12 18 ns
t
PHL
12 18 12 18 ns
R
L
= 667 Ω , C
L
= 45 pF
t
PZL
20 30 20 30 ns
t
PZH
15 23 15 23 ns
t
PLZ
10 20 10 20 ns
R
L
= 667 Ω , C
L
= 5 pF
t
PHZ
15 25 15 25 ns
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