SN54AS244J [TI]
Octal Buffers And Line Drivers With 3-State 20-CDIP -55 to 125;
| 型号： | SN54AS244J |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Octal Buffers And Line Drivers With 3-State 20-CDIP -55 to 125 驱动 CD 逻辑集成电路 |
| 文件： | 总7页 (文件大小：108K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54ALS244C, SN54AS244, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142B – JULY 1987 – REVISED DECEMBER 1994
SN54ALS244C, SN54AS244 . . . J PACKAGE
SN74ALS244C, SN74AS244A . . . DW OR N PACKAGE
(TOP VIEW)
• 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
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
2OE
1Y1
2A4
1Y2
2A3
1Y3
description
These octal buffers and line drivers are designed
specifically to improve the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters. With the ′ALS240A, ′ALS241C,
′AS240A, SN54AS241, and SN74AS241A, these
devices provide the choice of selected
combinations of inverting outputs, symmetrical
active-low output-enable (OE) inputs, and
complementary OE and OE inputs.
13 2A2
12 1Y4
11
2A1
SN54ALS244C, SN54AS244 . . . FK PACKAGE
(TOP VIEW)
3
2
1
20 19
18
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
The -1 version of SN74ALS244C is identical to the
standard version, except that the recommended
17
16
15
14
maximum I of the -1 version is 48 mA. There is
OL
no -1 version of the SN54ALS244C.
9 10 11 12 13
The SN54ALS244C and SN54AS244 are
characterized for operation over the full military
temperature range of –55°C to 125°C. The
SN74ALS244C
and
SN74AS244A
are
characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
Y
OE
A
H
L
L
L
H
L
H
X
Z
Copyright 1994, Texas Instruments Incorporated
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS244C, SN54AS244, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142B – JULY 1987 – REVISED DECEMBER 1994
†
logic symbol
logic diagram (positive logic)
1
1OE
1
1OE
EN
18
16
2
18
16
14
12
2
4
6
1Y1
1Y2
1A1
1A2
1A3
1A1
4
1Y1
1Y2
1Y3
1Y4
1A2
6
1A3
8
1A4
14
12
1Y3
1Y4
19
EN
2OE
8
1A4
2OE
11
2A1
13
9
7
5
3
2Y1
2Y2
2Y3
2Y4
2A2
15
19
2A3
17
2A4
9
7
11
13
15
17
2Y1
2Y2
2A1
2A2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
5
3
2Y3
2Y4
2A3
2A4
‡
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
I
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T : SN54ALS244C . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
A
SN74ALS244C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
SN54ALS244C, SN54AS244, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142B – JULY 1987 – REVISED DECEMBER 1994
recommended operating conditions
SN54ALS244C
MIN NOM MAX
5.5
SN74ALS244C
MIN NOM MAX
UNIT
V
V
Supply voltage
4.5
2
5
4.5
2
5
5.5
V
V
CC
High-level input voltage
IH
†
‡
0.8
0.8
V
IL
Low-level input voltage
V
0.7
I
I
High-level output current
Low-level output current
Operating free-air temperature
–12
12
–15
24
mA
mA
°C
OH
OL
§
48
70
T
–55
125
0
A
†
‡
§
Applies over temperature range –55°C to 70°C
Applies over temperature range 70°C to 125°C
Applies only to the -1 version and only if V
CC
is between 4.75 V and 5.25 V
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54ALS244C
SN74ALS244C
PARAMETER
TEST CONDITIONS
I = –18 mA
UNIT
¶
¶
MIN TYP
MAX
MIN TYP
MAX
V
IK
V
V
= 4.5 V,
–1.5
–1.5
V
CC
I
I
I
I
I
I
I
I
= –0.4 mA
= –3 mA
V
–2
V
–2
OH
OH
OH
OH
OL
OL
OL
CC
2.4
CC
2.4
= 4.5 V to 5.5 V
CC
3.2
3.2
V
OH
V
= –12 mA
= –15 mA
= 12 mA
2
V
V
= 4.5 V
= 4.5 V
CC
2
0.25
0.4
0.25
0.35
0.35
0.4
0.5
0.5
20
V
OL
= 24 mA
V
CC
= 48 mA (-1 version)
= 2.7 V
I
I
I
I
I
I
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
V
V
20
–20
0.1
µA
µA
OZH
OZL
I
O
= 0.4 V
–20
0.1
20
O
V = 7 V
I
mA
µA
V = 2.7 V
I
20
IH
V = 0.4 V
I
–0.1
–112
15
–0.1
–112
17
mA
mA
IL
#
V
O
= 2.25 V
–20
–30
O
Outputs high
Outputs low
9
15
17
9
15
17
I
V
CC
= 5.5 V
24
24
mA
CC
Outputs disabled
27
27
¶
#
All typical values are at V
= 5 V, T = 25°C.
A
CC
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
.
OS
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS244C, SN54AS244, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142B – JULY 1987 – REVISED DECEMBER 1994
switching characteristics (see Figure 1)
V
C
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
R1 = 500 Ω,
R2 = 500 Ω,
T
A
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
†
= MIN to MAX
SN54ALS244C SN74ALS244C
MIN
1
MAX
16
MIN
2
MAX
10
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A
ns
ns
ns
Y
Y
Y
3
12
3
10
1
26
3
20
OE
OE
1
24
3
20
2
10
2
10
1
26
1
13
†
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
I
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T : SN54AS244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
A
SN74AS244A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
SN54AS244
MIN NOM
SN74AS244A
MIN NOM MAX
UNIT
MAX
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
IH
0.8
–12
48
0.8
–15
64
V
IL
I
I
mA
mA
°C
OH
OL
T
A
–55
125
0
70
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS244C, SN54AS244, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142B – JULY 1987 – REVISED DECEMBER 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS244
SN74AS244A
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
= 4.5 V,
I = –18 mA
–1.2
–1.2
V
IK
CC
I
= 4.5 V to 5.5 V,
I
I
I
I
I
I
= –2 mA
= –3 mA
= –12 mA
= –15 mA
= 48 mA
= 64 mA
= 2.7 V
V
–2
V
–2
CC
OH
OH
OH
OH
OL
OL
CC
2.4
CC
2.4
3.4
3.4
V
OH
V
CC
= 4.5 V
2.4
2.4
0.55
V
OL
V
CC
= 4.5 V
V
0.55
50
I
I
I
I
V
CC
V
CC
V
CC
V
CC
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
V
50
–50
0.1
µA
µA
mA
µA
OZH
OZL
I
O
O
V
= 0.4 V
–50
0.1
20
V = 7 V
I
V = 2.7 V
I
20
IH
OE
A
–0.5
–1
–0.5
–1
I
V
= 5.5 V,
= 5.5 V,
V = 0.4 V
mA
mA
IL
CC
CC
I
‡
I
O
V
V
O
= 2.25 V
–50
–150
34
–50
–150
34
Outputs high
Outputs low
22
60
34
22
60
34
I
V
CC
= 5.5 V
90
90
mA
CC
Outputs disabled
54
54
†
‡
All typical values are at V
= 5 V, T = 25°C.
A
CC
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)
V
C
= 4.5 V to 5.5 V,
= 50 pF,
CC
L
R1 = 500 Ω,
R2 = 500 Ω,
T
A
FROM
TO
(OUTPUT)
PARAMETER
(INPUT)
UNIT
§
= MIN to MAX
SN54AS244
SN74AS244A
MIN
2
MAX
9
MIN
2
MAX
6.2
6.2
9
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A
ns
ns
ns
Y
Y
Y
2
7
1
2
10
8
1
OE
OE
2
2
7.5
6
2
6.5
10.5
1
2
1
9
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS244C, SN54AS244, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142B – JULY 1987 – REVISED DECEMBER 1994
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
7 V
R
= R1 = R2
V
CC
L
S1
R1
R
L
Test
Point
From Output
Under Test
From Output
Under Test
Test
Point
Test
Point
From Output
Under Test
C
C
L
R
L
R2
L
C
L
(see Note A)
(see Note A)
(see Note A)
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
3.5 V
3.5 V
Timing
Input
High-Level
1.3 V
1.3 V
1.3 V
Pulse
0.3 V
0.3 V
t
h
t
w
t
su
3.5 V
3.5 V
0.3 V
Data
Input
Low-Level
1.3 V
1.3 V
1.3 V
1.3 V
Pulse
0.3 V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
3.5 V
0.3 V
Output
Control
(low-level
enabling)
1.3 V
1.3 V
3.5 V
t
PZL
Input
1.3 V
1.3 V
t
PLZ
0.3 V
PHL
3.5 V
t
Waveform 1
S1 Closed
(see Note B)
t
PLH
1.3 V
V
OH
In-Phase
Output
1.3 V
1.3 V
1.3 V
V
OL
0.3 V
V
OL
t
PHZ
t
PLH
t
PZH
t
PHL
V
OH
V
Waveform 2
S1 Open
(see Note B)
OH
OL
Out-of-Phase
Output
(see Note C)
1.3 V
1.3 V
0.3 V
V
0 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
NOTES: A.
C includes probe and jig capacitance.
L
B. Waveform 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, t = t = 2 ns, duty cycle = 50%.
r
f
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated
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