Datasheet

SN54LS245, SN74LS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDLS146A – OCTOBER 1976 – REVISED FEBRUARY 2002
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
†
SN54LS245 SN74LS245
UNIT
PARAMETER
TEST
CONDITIONS
†
MIN TYP
‡
MAX MIN TYP
‡
MAX
UNIT
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
V
IK
Input clamp voltage V
CC
= MIN, I
I
= –18 mA –1.5 –1.5 V
Hysteresis (V
T+
– V
T–
) A or B V
CC
= MIN 0.2 0.4 0.2 0.4 V
V
OH
High level out
p
ut voltage
V
CC
= MIN,
V
IH
2V
I
OH
= –3 mA 2.4 3.4 2.4 3.4
V
V
OH
High
-
level
output
voltage
V
IH
=
2
V
,
V
IL
= V
IL(max)
I
OH
= MAX 2 2
V
V
OL
Low level out
p
ut voltage
V
CC
= MIN,
V
IH
2V
I
OL
= 12 mA 0.4 0.4
V
V
OL
Low
-
level
output
voltage
V
IH
=
2
V
,
V
IL
= V
IL(max)
I
OL
= 24 mA 0.5
V
I
OZH
Off-state output current,
high-level voltage applied
V
CC
= MAX,
OE
at 2 V
V
O
= 2.7 V 20 20 µA
I
OZL
Off-state output current,
low-level voltage applied
V
CC
= MAX,
OE
at 2 V
V
O
= 0.4 V –200 –200 µA
I
I
Input current at
maximum in
p
ut
A or B
V
CC
= MAX
V
I
= 5.5 V 0.1 0.1
mA
I
I
max
i
mum
i
npu
t
voltage
DIR or OE
V
CC
=
MAX
V
I
= 7 V 0.1 0.1
mA
I
IH
High-level input current V
CC
= MAX, V
IH
= 2.7 V 20 20 µA
I
IL
Low-level input current V
CC
= MAX, V
IL
= 0.4 V –0.2 –0.2 mA
I
OS
Short-circuit output current
§
V
CC
= MAX –40 –225 40 –225 mA
Total, outputs high 48 70 48 70
I
CC
Supply current
Total, outputs low
V
CC
= MAX Outputs open
62 90 62 90
mA
Outputs at high Z 64 95 64 95
†
For conditions shown as MIN or MAX, use the appropriate values specified under recommended operating conditions.
‡
All typical values are at V
CC
= 5 V, T
A
= 25°C.
§
Not more than one output should be shorted at a time, and duration of the short circuit should not exceed one second.
switching characteristics, V
CC
= 5 V, T
A
= 25°C (see Figure 1)
PARAMETER TEST CONDITIONS MIN TYP MAX
UNIT
t
PLH
Propagation delay time, low- to high-level output
C45pF
R 667
8 12
ns
t
PHL
Pro
p
agation delay time high to low level out
p
ut
C
L
=
45
p
F
,
R
L
=
667
8
12
ns
t
PHL
Propagation
dela
y
time
,
high
-
to
lo
w-
le
v
el
o
u
tp
u
t
8
12
t
PZL
Output enable time to low level
C
L
=45
p
F
R
L
= 667
27 40
ns
t
PZH
Output enable time to high level
C
L
=
45
pF
,
R
L
=
667
25 40
ns
t
PLZ
Output disable time from low level
C
L
=5
p
F
R
L
= 667
15 25
ns
t
PHZ
Output disable time from high level
C
L
=
5
pF
,
R
L
=
667
15 28
ns