SN54ALS241C, SN54AS241A, SN74ALS241C, SN74AS241A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153E DECEMBER 1982 REVISED AUGUST 1995
Copyright
1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
pnp Inputs Reduce dc Loading
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These octal buffers/drivers are designed
specifically to improve the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters. The designer has a choice of
selected combinations of inverting and
noninverting outputs, symmetrical active-low
output-enable (OE) inputs, and complementary
OE and OE inputs. These devices feature high
fan-out and improved fan-in.
The -1 version of SN74ALS241C is identical to the
standard version, except that the recommended
maximum I
OL
of the -1 version is 48 mA. There is
no -1 version of the SN54ALS241C.
The SN54ALS241C and SN54AS241A are
characterized for operation over the full military
temperature range of 55
C to 125
C. The
SN74ALS241C and SN74AS241A are
characterized for operation from 0
C to 70
C.
FUNCTION TABLES
INPUTS
OUTPUT
1OE
1A
1Y
L
H
H
L
L
L
H
X
Z
INPUTS
OUTPUT
2OE
2A
2Y
H
H
H
H
L
L
L
X
Z
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
SN54ALS241C, SN54AS241A . . . J PACKAGE
SN74ALS241C, SN74AS241A . . . DW OR N PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
SN54ALS241C, SN54AS241A . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
1Y4
2A2
2OE
2Y1
GND
2A1
V
CC
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN54ALS241C, SN54AS241A, SN74ALS241C, SN74AS241A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153E DECEMBER 1982 REVISED AUGUST 1995
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic symbol
logic diagram (positive logic)
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
2
1A1
4
1A2
6
1A3
8
1A4
EN
1
1Y1
18
1Y2
16
1Y3
14
1Y4
12
11
2A1
13
2A2
15
2A3
17
2A4
EN
19
2OE
2Y1
9
2Y2
7
2Y3
5
2Y4
3
1OE
1
2
4
6
8
19
11
13
15
17
3
5
7
9
12
14
16
18
1A1
1A2
1A3
1A4
1Y1
2OE
2A1
2A2
2A3
2A4
2Y1
1Y2
1Y3
1Y4
2Y2
2Y3
2Y4
1OE
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54ALS241C
55
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS241C
0
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
SN54ALS241C, SN54AS241A, SN74ALS241C, SN74AS241A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153E DECEMBER 1982 REVISED AUGUST 1995
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
SN54ALS241C
SN74ALS241C
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.7
0.8
V
IOH
High-level output current
12
15
mA
IOL
Low level output current
12
24
mA
IOL
Low-level output current
48
mA
TA
Operating free-air temperature
55
125
0
70
C
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS241C
SN74ALS241C
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
1.2
V
VCC = 4.5 V to 5.5 V, IOH = 0.4 mA
VCC 2
VCC 2
VOH
IOH = 3 mA
2.4
3.2
2.4
3.2
V
VOH
VCC = 4.5 V
IOH = 12 mA
2
V
IOH = 15 mA
2
IOL = 12 mA
0.25
0.4
0.25
0.4
VOL
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
V
IOL = 48 mA (-1 version)
0.35
0.5
IOZH
VCC = 5.5 V,
VO = 2.7 V
20
20
A
IOZL
VCC = 5.5 V,
VO = 0.4 V
20
20
A
II
VCC = 5.5 V,
VI = 7 V
0.1
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
20
A
IIL
VCC = 5.5 V,
VI = 0.4 V
0.1
0.1
mA
IO
VCC = 5.5 V,
VO = 2.25 V
20
112
30
112
mA
Outputs high
9
17
9
18
ICC
VCC = 5.5 V
Outputs low
15
28
15
26
mA
Outputs disabled
17
32
17
30
All typical values are at VCC = 5 V, TA = 25
C.
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
SN54ALS241C, SN54AS241A, SN74ALS241C, SN74AS241A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153E DECEMBER 1982 REVISED AUGUST 1995
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
,
R2 = 500
,
TA = MIN to MAX
UNIT
SN54ALS241C
SN74ALS241C
MIN
MAX
MIN
MAX
tPLH
A
Y
3
31
2
11
ns
tPHL
A
Y
1
17
3
10
ns
tPZH
1OE
Y
3
33
3
21
ns
tPZL
1OE
Y
3
27
4
21
ns
tPHZ
1OE
Y
2
17
1
10
ns
tPLZ
1OE
Y
2
32
2
15
ns
tPZH
2OE
Y
3
38
4
21
ns
tPZL
2OE
Y
3
30
5
21
ns
tPHZ
2OE
Y
2
17
2
10
ns
tPLZ
2OE
Y
3
35
3
15
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54AS241A
55
C to 125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74AS241A
0
C to 70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54AS241A
SN74AS241A
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.8
0.8
V
IOH
High-level output current
12
15
mA
IOL
Low-level output current
48
64
mA
TA
Operating free-air temperature
55
125
0
70
C
SN54ALS241C, SN54AS241A, SN74ALS241C, SN74AS241A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153E DECEMBER 1982 REVISED AUGUST 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS241A
SN74AS241A
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
VIK
VCC = 4.5 V,
II = 18 mA
1.2
1.2
V
VCC = 4.5 V to 5.5 V,
IOH = 2 mA
VCC 2
VCC 2
VOH
IOH = 3 mA
2.4
3.4
2.4
3.4
V
VOH
VCC = 4.5 V
IOH = 12 mA
2.4
V
IOH = 15 mA
2.4
VOL
VCC = 4 5 V
IOL = 48 mA
0.27
0.55
V
VOL
VCC = 4.5 V
IOL = 64 mA
0.31
0.55
V
IOZH
VCC = 5.5 V,
VO = 2.7 V
50
50
A
IOZL
VCC = 5.5 V,
VO = 0.4 V
50
50
A
II
VCC = 5.5 V,
VI = 7 V
0.1
0.1
mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
20
A
IIL
VCC = 5.5 V,
VI = 0.4 V
1
1
mA
IO
VCC = 5.5 V,
VO = 2.25 V
50
150
50
150
mA
Outputs high
22
35
22
35
ICC
VCC = 5.5 V
Outputs low
61
90
61
90
mA
Outputs disabled
35
56
35
56
All typical values are at VCC = 5 V, TA = 25
C.
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
,
R2 = 500
,
TA = MIN to MAX
UNIT
SN54AS241A
SN74AS241A
MIN
MAX
MIN
MAX
tPLH
A
Y
2
9
2
6.2
ns
tPHL
A
Y
1
7
1
6.2
ns
tPZH
1OE
Y
1
10
1
9
ns
tPZL
1OE
Y
2
8
2
7.5
ns
tPHZ
1OE
Y
1
6.5
1
6
ns
tPLZ
1OE
Y
1
10.5
1
9
ns
tPZH
2OE
Y
2
11
2
10.5
ns
tPZL
2OE
Y
3
9.5
3
8.5
ns
tPHZ
2OE
Y
1
7
1
7
ns
tPLZ
2OE
Y
2
12
2
12
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
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