Datasheet

SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS272A – NOVEMBER 1994 – REVISED JANUARY 2003
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS245 SN74AS245
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP
†
MAX MIN TYP
†
MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= –18 mA –1.2 –1.2 V
V
CC
= 4.5 V to 5.5 V, I
OH
= –2 mA V
CC
–2 V
CC
–2
V
OH
I
OH
= –3 mA 2.4 3.2 2.4 3.2
V
V
OH
V
CC
= 4.5 V
I
OH
= –12 mA 2
V
I
OH
= –15 mA 2
V
OL
V
CC
=45V
I
OL
= 48 mA 0.3 0.55
V
V
OL
V
CC
=
4
.
5
V
I
OL
= 64 mA
0.35 0.55
V
I
I
Control inputs
V
CC
=55V
V
I
= 7 V 0.1 0.1
mA
I
I
A or B ports
V
CC
=
5
.
5
V
V
I
= 5.5 V 0.1 0.1
mA
I
IH
Control inputs
V
CC
=55V
V
I
=27V
50 20
µA
I
IH
A or B ports
‡
V
CC
=
5
.
5
V
,
V
I
=
2
.
7
V
70 70
µ
A
I
IL
Control inputs
V
CC
=55V
V
I
=04V
–0.5 –0.5
mA
I
IL
A or B ports
‡
V
CC
=
5
.
5
V
,
V
I
=
0
.
4
V
–0.75 –0.75
mA
I
O
§
V
CC
= 5.5 V, V
O
= 2.25 V –50 –150 –50 –150 mA
Outputs high 62 97 62 97
I
CC
V
CC
= 5.5 V
Outputs low 95 143 95 143
mA
Outputs disabled 79 123 79 123
†
All typical values are V
CC
= 5 V, T
A
= 25°C.
‡
For I/O ports, the parameters I
IH
and I
IL
include the off-state output current.
§
The output conditions have been chosen to produce a current that closely approximates one-half of the true short-circuit output current, I
OS
.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 4.5 V to 5.5 V,
C
L
= 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
T
A
= MIN to MAX
¶
UNIT
SN54AS245 SN74AS245
MIN MAX MIN MAX
t
PLH
AorB
BorA
2 9.5 2 7.5
ns
t
PHL
A
or
B
B
or
A
2 9 2 7
ns
t
PZH
OE
AorB
2 11 2 9
ns
t
PZL
OE
A
or
B
2 10.5 2 8.5
ns
t
PHZ
OE
AorB
2 7.5 2 5.5
ns
t
PLZ
OE
A
or
B
2 12 2 9.5
ns
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.