74AC11240NT [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： | 74AC11240NT |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS |
| 文件： | 总6页 (文件大小：98K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74AC11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS448A – MAY 1987 – REVISED APRIL 1996
DB, DW, OR NT PACKAGE
(TOP VIEW)
Flow-Through Architecture Optimizes
PCB Layout
Center-Pin V
Minimize High-Speed Switching Noise
and GND Configurations
CC
1
24
23
22
21
20
19
18
17
16
15
14
13
1Y1
1Y2
1Y3
1OE
1A1
1A2
1A3
1A4
2
EPIC (Enhanced-Performance Implanted
CMOS) 1- m Process
3
4
1Y4
500-mA Typical Latch-Up Immunity at
125°C
5
GND
GND
GND
GND
2Y1
2Y2
2Y3
2Y4
6
V
V
CC
CC
7
Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, and Standard
Plastic 300-mil DIPs (NT)
8
2A1
2A2
2A3
2A4
2OE
9
10
11
12
description
Thisoctalbuffer/linedriverisdesignedspecifically
to improve both the performance and density of
3-state memory address drivers, clock drivers,
and bus-oriented receivers and transmitters. This
device
provides
inverting
outputs
and
symmetrical active-low output-enable (OE)
inputs. This device features high fan-out and
improved fan-in.
The 74AC11240 is organized as two 4-bit buffers/line drivers with separate OE inputs. When OE is low, the
device passes inverted data from the A inputs to the Y outputs. When OE is high, the outputs are in the
high-impedance state.
The 74AC11240 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
Y
OE
L
A
H
L
L
L
H
Z
H
X
†
logic symbol
24
13
1OE
EN
2OE
EN
23
1A1
22
1
2
3
4
17
16
15
14
9
10
11
12
1
1
1Y1
2Y1
2Y2
2Y3
2Y4
2A1
2A2
2A3
2A4
1Y2
1Y3
1Y4
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
74AC11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS448A – MAY 1987 – REVISED APRIL 1996
logic diagram (positive logic)
13
24
1OE
2OE
2A1
2A2
2A3
2A4
23
1
2
3
17
16
15
9
10
11
1Y1
1Y2
1Y3
1Y4
2Y1
1A1
22
1A2
2Y2
2Y3
2Y4
21
1A3
20
4
14
12
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
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.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74AC11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS448A – MAY 1987 – REVISED APRIL 1996
recommended operating conditions
MIN NOM
MAX
UNIT
V
Supply voltage
3
2.1
5
5.5
V
CC
IH
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 3 V
V
High-level input voltage
= 4.5 V
= 5.5 V
= 3 V
3.15
3.85
V
V
0.9
1.35
1.65
V
IL
Low-level input voltage
= 4.5 V
= 5.5 V
V
V
Input voltage
0
0
V
V
V
I
CC
Output voltage
V
CC
–4
O
V
V
V
V
V
V
= 3 V
CC
CC
CC
CC
CC
CC
I
High-level output current
Low-level output current
= 4.5 V
= 5.5 V
= 3 V
–24
–24
12
24
24
5
mA
mA
OH
OL
I
= 4.5 V
= 5.5 V
0
0
OE
∆t/∆v
Input transition rise or fall rate
Operating free-air temperature
ns/V
Data
10
85
T
A
–40
°C
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
2.9
TYP
MAX
3 V
2.9
4.4
I
= –50
A
4.5 V
5.5 V
3 V
4.4
OH
5.4
5.4
V
OH
I
I
I
= –4 mA
= –24 mA
= –75 mA
2.58
3.94
4.94
2.48
3.8
V
OH
OH
OH
4.5 V
5.5 V
5.5 V
3 V
4.8
3.85
0.1
0.1
0.1
0.1
I
= 50
A
4.5 V
5.5 V
3 V
OL
0.1
0.1
V
OL
I
I
I
= 12 mA
= 24 mA
= 75 mA
0.36
0.36
0.36
0.44
0.44
0.44
1.65
±5
V
OL
OL
OL
4.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5.5 V
5 V
I
I
I
V
= V or GND
CC
±0.5
±0.1
8
A
A
OZ
O
V = V
or GND
or GND,
or GND
±1
I
I
CC
CC
CC
V = V
I = 0
O
80
A
CC
I
C
C
V = V
4
pF
pF
i
I
V
= V or GND
CC
5 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.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74AC11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS448A – MAY 1987 – REVISED APRIL 1996
switching characteristics over recommended operating free-air temperature range,
V
= 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)
CC
T
A
= 25°C
TYP
7.6
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
MIN
MAX
UNIT
ns
MIN
1.5
1.5
1.5
1.5
1.5
1.5
MAX
10.5
8.6
t
t
1.5
1.5
1.5
1.5
1.5
1.5
11.7
9.5
12.7
12
PLH
PHL
PZH
A
Y
Y
Y
6.3
t
8.2
11.6
10.8
7.5
ns
OE
OE
t
7.6
PZL
t
5.5
7.8
9.8
PHZ
ns
t
6.7
9.4
PLZ
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
5.4
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
MIN
MAX
UNIT
ns
MIN
1.5
1.5
1.5
1.5
1.5
1.5
MAX
7.5
6.6
8.2
7.7
6.3
7.3
t
t
1.5
1.5
1.5
1.5
1.5
1.5
8.4
7.2
9.2
8.7
6.6
7.7
PLH
PHL
PZH
A
Y
Y
Y
4.6
t
5.7
ns
OE
OE
t
5.3
PZL
t
4.7
PHZ
ns
t
5.2
PLZ
operating characteristics, V
= 5 V, T = 25°C
A
CC
PARAMETER
TEST CONDITIONS
= 50 pF, f = 1 MHz
L
TYP
39
UNIT
Outputs enabled
Outputs disabled
C
Power dissipation capacitance per buffer
C
pF
pd
12
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
74AC11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS448A – MAY 1987 – REVISED APRIL 1996
PARAMETER MEASUREMENT INFORMATION
2 × V
CC
Open
GND
TEST
S1
S1
t
/t
Open
500 Ω
PLH PHL
From Output
Under Test
t
/t
2 × V
CC
GND
PLZ PZL
t
/t
PHZ PZH
C
= 50 pF
L
500 Ω
(see Note A)
LOAD CIRCUIT
Output
V
CC
Control
(low-level
enabling)
50% V
50% V
CC
CC
0 V
t
PZL
V
t
PLZ
CC
Output
Waveform 1
V
CC
Input
50% V
50% V
CC
50% V
CC
CC
0 V
20% V
80% V
S1 at 2 × V
(see Note B)
CC
CC
V
V
OL
t
PHL
t
PHZ
t
PLH
t
PZH
Output
Waveform 2
S1 at GND
V
OH
OH
0 V
CC
50% V
50% V
Output
CC
CC
V
50% V
CC
OL
(see Note B)
VOLTAGE WAVEFORMS
VOLTAGE WAVEFORMS
NOTES: A.
C
L includes probe and jig capacitance.
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
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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pertaining to warranty, patent infringement, and limitation of liability.
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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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