Texas Instruments JM38510-38303B2A, JM38510-38303BRA, SN54AS241AJ, SN54ALS241CJ, SN74ALS241CDWR Datasheet
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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 LL
HXZ
INPUTS
OUTPUT
2OE 2A
2Y
H H H
H LL
LXZ
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
910111213
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
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
I
OH
High-level output current –12 –15 mA
p
12 24
IOLLow-level output current
48
†
mA
T
A
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)
SN54ALS241C SN74ALS241C
PARAMETER
TEST CONDITIONS
MIN TYP‡MAX MIN TYP‡MAX
UNIT
V
IK
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
IOH = –3 mA 2.4 3.2 2.4 3.2
V
OH
VCC = 4.5 V
IOH = –12 mA 2
V
IOH = –15 mA 2
IOL = 12 mA 0.25 0.4 0.25 0.4
V
OL
VCC = 4.5 V
IOL = 24 mA 0.35 0.5
V
IOL = 48 mA (-1 version) 0.35 0.5
I
OZH
VCC = 5.5 V, VO = 2.7 V 20 20 µA
I
OZL
VCC = 5.5 V, VO = 0.4 V –20 –20 µA
I
I
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
I
IH
VCC = 5.5 V, VI = 2.7 V 20 20 µA
I
IL
VCC = 5.5 V, VI = 0.4 V –0.1 –0.1 mA
I
O
§
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
Outputs high 9 17 9 18
I
CC
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 Ω
,
R2 = 500 Ω,
TA = MIN to MAX
†
UNIT
SN54ALS241C SN74ALS241C
MIN MAX MIN MAX
t
PLH
3 31 2 11
t
PHL
A
Y
1 17 3 10
ns
t
PZH
3 33 3 21
t
PZL
1OE
Y
3 27 4 21
ns
t
PHZ
2 17 1 10
t
PLZ
1OE
Y
2 32 2 15
ns
t
PZH
3 38 4 21
t
PZL
2OE
Y
3 30 5 21
ns
t
PHZ
2 17 2 10
t
PLZ
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
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
OH
High-level output current –12 –15 mA
I
OL
Low-level output current 48 64 mA
T
A
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)
SN54AS241A SN74AS241A
PARAMETER
TEST CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
V
IK
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
IOH = –3 mA 2.4 3.4 2.4 3.4
V
OH
VCC = 4.5 V
IOH = –12 mA 2.4
V
IOH = –15 mA 2.4
IOL = 48 mA 0.27 0.55
V
OL
V
CC
= 4.5
V
IOL = 64 mA 0.31 0.55
V
I
OZH
VCC = 5.5 V, VO = 2.7 V 50 50 µA
I
OZL
VCC = 5.5 V, VO = 0.4 V –50 –50 µA
I
I
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
I
IH
VCC = 5.5 V, VI = 2.7 V 20 20 µA
I
IL
VCC = 5.5 V, VI = 0.4 V –1 –1 mA
I
O
‡
VCC = 5.5 V, VO = 2.25 V –50 –150 –50 –150 mA
Outputs high 22 35 22 35
I
CC
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 Ω
,
R2 = 500 Ω,
TA = MIN to MAX
§
UNIT
SN54AS241A SN74AS241A
MIN MAX MIN MAX
t
PLH
2 9 2 6.2
t
PHL
A
Y
1 7 1 6.2
ns
t
PZH
1 10 1 9
t
PZL
1OE
Y
2 8 2 7.5
ns
t
PHZ
1 6.5 1 6
t
PLZ
1OE
Y
1 10.5 1 9
ns
t
PZH
2 11 2 10.5
t
PZL
2OE
Y
3 9.5 3 8.5
ns
t
PHZ
1 7 1 7
t
PLZ
2OE
Y
2 12 2 12
ns
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
SN54ALS241C, SN54AS241A, SN74ALS241C, SN74AS241A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDAS153E – DECEMBER 1982 – REVISED AUGUST 1995
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
t
PHZ
t
PLZ
t
PHL
t
PLH
0.3 V
t
PZL
t
PZH
t
PLH
t
PHL
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
From Output
Under Test
Test
Point
R1
S1
C
L
(see Note A)
7 V
1.3 V
1.3 V1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
t
h
t
su
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing
Input
Data
Input
1.3 V 1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
t
w
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Out-of-Phase
Output
(see Note C)
1.3 V 1.3 V
1.3 V1.3 V
1.3 V 1.3 V
1.3 V1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
V
OL
V
OH
V
OH
V
OL
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
[
0 V
V
OH
V
OL
[
3.5 V
In-Phase
Output
0.3 V
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
R2
V
CC
R
L
Test
Point
From Output
Under Test
C
L
(see Note A)
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
From Output
Under Test
Test
Point
C
L
(see Note A)
R
L
RL = R1 = R2
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
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