SN54ACT244W [TI]
OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS; 八路缓冲器/驱动器，具有三态输出
| 型号： | SN54ACT244W |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| 文件： | 总5页 (文件大小：85K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54ACT244, SN74ACT244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS517B – JUNE 1995 – REVISED MAY 1996
SN54ACT244 . . . J OR W PACKAGE
SN74ACT244 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
Inputs Are TTL Compatible
EPIC (Enhanced-Performance Implanted
CMOS) 1-µm Process
Package Options Include Plastic
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
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Flat (W) Packages, Ceramic Chip Carriers
(FK), and Plastic (N) and Ceramic (J) DIPs
2OE
1Y1
2A4
1Y2
2A3
description
14 1Y3
13 2A2
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.
12
11
1Y4
2A1
SN54ACT244 . . . FK PACKAGE
(TOP VIEW)
The ’ACT244 are organized as two 4-bit
buffers/drivers with separate output-enable (OE)
inputs. When OE is low, the device passes
noninverted data from the A inputs to the Y
outputs. When OE is high, the outputs are in the
high-impedance state.
3
2
1
20 19
18
4
5
6
7
8
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
17
16
15
14
The SN54ACT244 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ACT244 is characterized for
operation from –40°C to 85°C.
9 10 11 12 13
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
Y
OE
A
H
L
L
L
H
L
H
X
Z
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC is a trademark of Texas Instruments Incorporated.
Copyright 1996, 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
SN54ACT244, SN74ACT244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS517B – JUNE 1995 – REVISED MAY 1996
†
logic symbol
1
19
1OE
EN
EN
2OE
2
4
6
8
18
16
14
12
11
13
15
17
9
7
5
3
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
1
19
1OE
2OE
9
7
18
16
11
13
15
2
1Y1
1Y2
2Y1
1A1
2A1
2A2
4
2Y2
2Y3
2Y4
1A2
5
3
14
12
6
1Y3
1Y4
1A3
2A3
2A4
17
8
1A4
‡
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
+ 0.5 V
+ 0.5 V
I
CC
CC
Output voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
O
Input clamp current, I (V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
IK
I
I
CC
Output clamp current, I
(V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
OK
O O CC
Continuous output current, I (V = 0 to V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Continuous current through V
Maximum power dissipation at T = 55°C (in still air) (see Note 2): DB package . . . . . . . . . . . . . . . . . . 0.6 W
O
O
CC
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA
A
DW package . . . . . . . . . . . . . . . . . . 1.6 W
N package . . . . . . . . . . . . . . . . . . . . 1.3 W
PW package . . . . . . . . . . . . . . . . . . 0.7 W
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
‡
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.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ACT244, SN74ACT244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS517B – JUNE 1995 – REVISED MAY 1996
recommended operating conditions (see Note 3)
SN54ACT244 SN74ACT244
UNIT
MIN
4.5
2
MAX
MIN
4.5
2
MAX
V
V
V
V
V
Supply voltage
5.5
5.5
V
V
CC
IH
IL
High-level input voltage
Low-level input voltage
Input voltage
0.8
0.8
V
0
0
V
V
0
0
V
V
V
I
CC
CC
Output voltage
V
O
CC
CC
I
High-level output current
Low-level output current
Input transition rise or fall rate
Operating free-air temperature
–24
24
–24
24
8
mA
mA
ns/V
°C
OH
OL
I
∆t/∆v
0
8
0
T
–55
125
–40
85
A
NOTE 3: Unused inputs must be held high or low to prevent them from floating.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
A
= 25°C
TYP
SN54ACT244 SN74ACT244
PARAMETER
TEST CONDITIONS
V
UNIT
CC
MIN
4.4
MAX
MIN
4.4
MAX
MIN
4.4
MAX
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
5.5 V
4.5 V
5.5 V
4.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
4.49
I
I
= –50 µA
OH
5.4
5.49
5.4
5.4
3.86
4.86
3.7
3.76
4.76
V
OH
V
= –24 mA
= –50 mA
OL
4.7
†
I
I
3.85
OH
†
= –75 mA
3.85
OH
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
I
= 50 µA
OL
OL
0.36
0.36
0.5
0.44
0.44
V
I
I
= 24 mA
V
OL
0.5
†
†
I
I
= 50 mA
1.65
OL
= 75 mA
1.65
±2.5
±1
OL
V
= V
or GND
CC
±0.25
±0.1
4
±5
±1
80
µA
µA
µA
O
OZ
I
I
V = V
or GND
or GND,
I
CC
CC
I
V = V
I = 0
O
40
CC
I
One input at 3.4 V,
Other inputs at GND or V
‡
5.5 V
0.6
1.6
1.5
mA
∆I
CC
CC
C
C
V = V
or GND
or GND
5 V
5 V
2.5
8
pF
pF
i
I
CC
CC
V = V
I
o
†
‡
Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.
This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or V
.
CC
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ACT244, SN74ACT244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS517B – JUNE 1995 – REVISED MAY 1996
switching characteristics over recommended operating free-air temperature range,
V
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
CC
T = 25°C
A
SN54ACT244 SN74ACT244
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
ns
MIN
2
TYP
6.5
7
MAX
9
MIN
1
MAX
10
MIN
1.5
1.5
1
MAX
10
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A
Y
Y
Y
2
9
1
10
10
1.5
2
7
8.5
9.5
9.5
10
1
9.5
11
9.5
ns
OE
OE
7
1
1.5
1.5
2
10.5
10.5
10.5
2
8
1
11
ns
2.5
7.5
1
11.5
operating characteristics, V
= 5 V, T = 25°C
A
CC
PARAMETER
TEST CONDITIONS
TYP
UNIT
C
Power dissipation capacitance per buffer/driver
C
= 50 pF,
L
f = 1 MHz
45
pF
pd
PARAMETER MEASUREMENT INFORMATION
2 × V
CC
Open
S1
TEST
S1
500 Ω
From Output
Under Test
t
/t
Open
PLH PHL
t
/t
2 × V
CC
Open
PLZ PZL
C
= 50 pF
L
t
/t
500 Ω
PHZ PZH
(see Note A)
LOAD CIRCUIT
Output
Control
(low-level
enabling)
3 V
0 V
1.5 V
1.5 V
t
PZL
3 V
0 V
t
PLZ
Output
Waveform 1
V
CC
Input
1.5 V
1.5 V
50% V
CC
V
V
+ 0.3 V
– 0.3 V
S1 at 2 × V
(see Note B)
OL
CC
V
V
OL
t
PLH
t
t
PHZ
PHL
t
PZH
Output
Waveform 2
S1 at Open
(see Note B)
V
OH
OH
OH
50% V
50% V
Output
50% V
CC
CC
CC
V
0 V
OL
VOLTAGE WAVEFORMS
VOLTAGE WAVEFORMS
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. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Z = 50 Ω, t ≤ 2.5 ns, t ≤ 2.5 ns.
O
r
f
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
4
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
相关型号：
©2020 ICPDF网 联系我们和版权申明