74ACT11244NT [TI]
OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS; 八路缓冲器/ 3态输出线路驱动器
| 型号： | 74ACT11244NT |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS |
| 文件： | 总5页 (文件大小：88K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74ACT11244
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS006C – AUGUST 1987 – REVISED APRIL 1996
DB, DW, NT, OR PW PACKAGE
(TOP VIEW)
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
Inputs Are TTL-Voltage Compatible
1
24
23
22
21
20
19
18
17
16
15
14
13
1Y1
1Y2
1Y3
1OE
1A1
1A2
1A3
1A4
Flow-Through Architecture Optimizes
PCB Layout
2
3
Center-Pin V
Minimize High-Speed Switching Noise
and GND Configurations to
4
1Y4
CC
5
GND
GND
GND
GND
2Y1
2Y2
2Y3
2Y4
6
V
EPIC (Enhanced-Performance Implanted
CMOS) 1- m Process
CC
7
V
CC
8
2A1
2A2
2A3
2A4
2OE
500-mA Typical Latch-Up Immunity at
125°C
9
10
11
12
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, and Standard Plastic 300-mil
DIPs (NT)
description
ThIs octal buffer or line driver is designed specifically to improve both the performance and density of 3-state
memory address drivers, clock drivers, and bus-oriented receivers and transmitters. Together with the
’ACT11240, this device provides the choice of various combinations of inverting and noninverting outputs.
The 74ACT11244 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
OUTPUT
DATA
OUTPUT
ENABLE
INPUT
Y
A
1OE, 2OE
H
L
L
X
L
Z
L
H
H
†
logic symbol
24
13
1OE
2OE
EN
20
EN
23
1A1
22
1
2
3
4
17
16
15
14
9
10
11
12
1Y1
1Y2
1Y3
1Y4
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
1A2
21
1A3
20
1A4
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
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
74ACT11244
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS006C – AUGUST 1987 – REVISED APRIL 1996
logic diagram (positive logic)
24
13
1OE
2OE
1
23
9
17
16
15
1A1
1Y1
1Y2
2A1
2A2
2Y1
2Y2
2
3
10
22
1A2
21
11
12
1A3
1Y3
1Y4
2A3
2A4
2Y3
2Y4
20
4
14
1A4
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 6 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 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 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 . . . . . . . . . . . . . . . . . . 0.65 W
O
O
CC
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA
A
DW package . . . . . . . . . . . . . . . . . . 1.7 W
NT 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 NT package, which has a trace length of zero.
recommended operating conditions
MIN
4.5
2
MAX
UNIT
V
V
V
V
V
V
Supply voltage
5.5
CC
IH
IL
High-level input voltage
Low-level input voltage
Input voltage
V
0.8
V
0
0
V
V
V
I
CC
Output voltage
V
O
CC
I
High-level output current
Low-level output current
Input transition rise or fall rate
Operating free-air temperature
–24
24
mA
mA
ns/V
°C
OH
I
OL
t/ v
0
10
T
–40
85
A
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT11244
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS006C – AUGUST 1987 – REVISED APRIL 1996
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
A
= 25°C
PARAMETER
TEST CONDITIONS
V
MIN
MAX
UNIT
CC
MIN
4.4
TYP
MAX
4.5 V
5.5 V
4.5 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
4.4
5.4
I
I
= –50 A
OH
5.4
3.94
4.94
3.8
V
V
OH
OL
= –24 mA
= –75 mA
OH
4.8
3.85
I
I
OH
0.1
0.1
0.1
0.1
= 50
A
OL
0.36
0.36
0.44
0.44
1.65
±5
V
V
I
I
= 24 mA
= 75 mA
OL
OL
I
I
I
V
= V or GND
CC
±0.5
±0.1
8
A
A
A
OZ
O
V = V
or GND
or GND,
±1
I
I
CC
CC
V = V
I = 0
O
80
CC
I
I
One input at 3.4 V,
V = V or GND
Other inputs at GND or V
CC
5.5 V
0.9
1
mA
CC
C
C
5 V
5 V
4
pF
pF
i
I
CC
= V or GND
CC
V
10
o
O
†
‡
Not more than one output should be tested at a time, and the duration of the test should not exceed 10 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
switching characteristics over recommended operating free-air temperature range,
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
V
CC
T
A
= 25°C
TYP
6
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
MIN
MAX
UNIT
ns
MIN
1.5
1.5
1.5
1.5
1.5
1.5
MAX
8.9
t
t
t
t
t
t
1.5
1.5
1.5
1.5
1.5
1.5
9.9
9.2
PLH
PHL
PZH
PZL
PHZ
PLZ
A
Y
Y
Y
5.4
8.6
6.6
11.3
10.5
9.8
12.5
11.4
10.4
11.2
ns
OE
OE
6.7
7.4
ns
7.8
10.6
operating characteristics, V
= 5 V, T = 25°C
A
CC
PARAMETER
TEST CONDITIONS
= 50 pF, f = 1 MHz
L
TYP
27
9
UNIT
Outputs enabled
Outputs disabled
C
Power dissipation capacitance per buffer
C
pF
pd
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74ACT11244
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS006C – AUGUST 1987 – REVISED APRIL 1996
PARAMETER MEASUREMENT INFORMATION
2 × V
CC
Open
GND
TEST
S1
S1
t
/t
Open
PLH PHL
/t
500 Ω
From Output
Under Test
t
2 × V
CC
GND
PLZ PZL
t
/t
PHZ PZH
C
= 50 pF
L
500 Ω
(see Note A)
Output
Control
(low-level
enabling)
3 V
0 V
LOAD CIRCUIT
1.5 V
1.5 V
t
PZL
3 V
0 V
t
PLZ
Output
Waveform 1
V
Input
CC
1.5 V
1.5 V
50% V
CC
20% V
S1 at 2 × V
(see Note B)
CC
CC
CC
V
V
OL
t
PLH
t
PHZ
t
PHL
t
PZH
Output
Waveform 2
S1 at GND
V
OH
OH
0 V
80% V
50% V
50% V
Output
CC
CC
50% V
CC
V
OL
(see Note B)
VOLTAGE WAVEFORMS
C includes probe and jig capacitance.
L
VOLTAGE WAVEFORMS
NOTES: A.
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 = 3 ns, t = 3 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
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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Copyright 1998, Texas Instruments Incorporated
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