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SN54ALS241B, SN54AS241, SN74ALS241C, SN74AS241
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153C – DECEMBER 1982 – REVISED AUGUST 1994
•
•
•
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
SN54ALS241B, SN54AS241 . . . J PACKAGE
SN74ALS241C, SN74AS241 . . . DW OR N PACKAGE
(TOP VIEW)
description
These octal buffers and line drivers are designed
specifically to improve both 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 OE (active-low
output control) inputs, and complementary OE
and OE inputs. These devices feature high fan-out
and improved fan-in.
The – 1 version of the SN74ALS′ parts are
identical to their standard versions except the
recommended maximum I
OL
is increased to
48 mA. There are no – 1 versions of the
SN54ALS241B.
The SN54ALS241B and SN54AS241 are
characterized for operation over the full
military temperature range of – 55°C to 125°C.
The SN74ALS241C and SN74AS241 are
characterized for operation from 0°C to 70°C.
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
SN54ALS241B, SN54AS241 . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
V
CC
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
2OE
1Y1
2A4
1Y2
2A3
1Y3
FUNCTION TABLES
INPUTS
1OE
L
L
H
1A
H
L
X
OUTPUT
1Y
H
L
Z
INPUTS
2OE
H
H
L
2A
H
L
X
OUTPUT
2Y
H
L
Z
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.
Copyright
©
1994, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2Y1
GND
2A1
1Y4
2A2
1
SN54ALS241B, SN54AS241, SN74ALS241C, SN74AS241
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153C – DECEMBER 1982 – REVISED AUGUST 1994
logic symbol
†
1OE
1
EN
18
16
14
12
logic diagram (positive logic)
1OE
1
1A1
1A2
1A3
1A4
2
4
6
8
1Y1
1Y2
1Y3
1Y4
1A1
2
18
1Y1
1A2
4
16
1Y2
1A3
2OE
19
EN
9
7
5
3
1A4
2Y1
2Y2
2Y3
2Y4
2A1
2OE
6
14
1Y3
8
12
2A1
2A2
2A3
2A4
11
13
15
17
1Y4
19
11
9
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
2Y1
2A2
13
7
2Y2
2A3
15
5
2Y3
2A4
17
3
2Y4
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
: SN54ALS241B, SN54AS241 . . . . . . . . . . . . . . . – 55°C to 125°C
SN74ALS241C, SN74AS241 . . . . . . . . . . . . . . . . . . . 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.
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54ALS241B, SN54AS241, SN74ALS241C, SN74AS241
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153C – DECEMBER 1982 – REVISED AUGUST 1994
recommended operating conditions
SN54ALS241B
MIN
VCC
VIH
VIL
IOH
IOL
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level
Low level output current
4.5
2
0.7
– 12
12
0
NOM
5
MAX
5.5
SN74ALS241C
MIN
4.5
2
0.8
– 15
24
48†
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
°C
TA
Operating free-air temperature
– 55
125
† The 48-mA limit applies only to the –1 version and only if the VCC is maintained between 4.75 V and 5.25 V.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
VCC = 4.5 V
II = – 18 mA
IOH = – 0.4 mA
IOH = – 3 mA
IOH = – 12 mA
IOH = – 15 mA
IOL = 12 mA
IOL = 24 mA
IOL = 48 mA (– 1 version)
VO = 2.7 V
VO = 0.4 V
VI = 7 V
VI = 2.7 V
VI = 0.4 V
VO = 2.25 V
Outputs high
ICC
VCC = 5.5 V
Outputs low
Outputs disabled
– 20
9
15
17
20
– 20
0.1
20
– 0.1
– 112
17
28
32
– 30
9
15
17
SN54ALS241B
MIN TYP‡
MAX
– 1.2
VCC – 2
2.4
2
2
0.25
0.4
0.25
0.35
0 35
0.4
0.5
05
20
– 20
0.1
20
– 0.1
– 112
18
26
30
mA
V
µA
µA
mA
µA
mA
mA
3.2
VCC – 2
2.4
3.2
SN74ALS241C
MIN TYP‡
MAX
– 1.2
UNIT
V
VOH
V
VOL
IOZH
IOZL
II
IIH
IIL
IO§
VCC = 4 5 V
4.5
VCC = 4.75 V
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
‡ 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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SN54ALS241B, SN54AS241, SN74ALS241C, SN74AS241
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153C – DECEMBER 1982 – REVISED AUGUST 1994
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500
Ω,
R2 = 500
Ω,
TA = MIN to MAX†
SN54ALS241B
MIN
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
A
Y
Y
Y
Y
Y
3
1
3
3
2
2
3
3
2
3
MAX
31
17
33
27
17
32
38
30
17
35
SN74ALS241C
MIN
2
3
3
4
1
2
4
5
2
3
MAX
11
10
21
21
10
15
21
21
10
15
ns
ns
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
1OE
1OE
2OE
2OE
† For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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