Datasheet

SN74ALS1640A, SN74ALS1645A
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS246B – DECEMBER 1982 – REVISED FEBRUARY 1997
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS
SN74ALS1640A
SN74ALS1645A
UNIT
MIN TYP
†
MAX
V
IK
V
CC
= 4.5 V, I
I
= –18 mA –1.5 V
V
CC
= 4.5 V to 5.5 V, I
OH
= –0.4 mA V
CC
–2
V
OH
V
CC
=45V
I
OH
= –3 mA 2.4 3.2
V
V
CC
=
4
.
5
V
I
OH
= –15 mA 2
V
OL
V
CC
=45V
I
OL
= 8 mA 0.25 0.4
V
V
OL
V
CC
=
4
.
5
V
I
OL
= 16 mA 0.35 0.5
V
I
I
Control inputs
V
CC
=55V
V
I
= 7 V 0.1
mA
I
I
A or B ports
V
CC
=
5
.
5
V
V
I
= 5.5 V 0.1
mA
I
IH
Control inputs
V
CC
=55V
V
I
=27V
20
µA
I
IH
A or B ports
‡
V
CC
=
5
.
5
V
,
V
I
=
2
.
7
V
20
µ
A
I
IL
Control inputs
V
CC
=55V
V
I
=04V
–0.1
mA
I
IL
A or B ports
‡
V
CC
=
5
.
5
V
,
V
I
=
0
.
4
V
–0.1
mA
I
O
§
V
CC
= 5.5 V, V
O
= 2.25 V –30 –112 mA
I
CC
SN74ALS1640A V
CC
= 5.5 V 18 32
mA
I
CC
SN74ALS1645A V
CC
= 5.5 V 25 38
mA
†
All typical values are at 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
SN74ALS1640A SN74ALS1645A
MIN MAX MIN MAX
t
PLH
AorB
BorA
4 15 2 13
ns
t
PHL
A
or
B
B
or
A
2 10 2 13
ns
t
PZH
OE
AorB
5 20 8 25
ns
t
PZL
OE
A
or
B
5 22 8 25
ns
t
PHZ
OE
AorB
2 10 2 12
ns
t
PLZ
OE
A
or
B
5 13 3 18
ns
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.