SN74BCT2240N [TI]
OCTAL BUFFERS AND LINE/MOS DRIVERS WITH 3-STATE OUTPUTS; 八路缓冲器和线路/ MOS具有三态输出驱动程序
| 型号： | SN74BCT2240N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUFFERS AND LINE/MOS DRIVERS WITH 3-STATE OUTPUTS |
| 文件： | 总5页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54BCT2240, SN74BCT2240
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS030D – SEPTEMBER 1988 – REVISED APRIL 1994
SN54BCT2240 . . . J OR W PACKAGE
SN74BCT2240 . . . DB, DW, OR N PACKAGE
(TOP VIEW)
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• Output Ports Have Equivalent 33-Ω Series
Resistors, So No External Resistors Are
Required
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
• 3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
• Package Options Include Plastic
Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(J, N)
description
SN54BCT2240 . . . FK PACKAGE
(TOP VIEW)
These octal buffers and line drivers are designed
specifically to improve both the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
3
2
1
20 19
18
transmitters.
Taken
together
with
the
4
5
6
7
8
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
SN74BCT2241 and ′BCT2244, these devices
provide the 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.
17
16
15
14
9 10 11 12 13
The ′BCT2240 is organized as two 4-bit line
drivers with separate output-enable (OE) inputs.
When OE is low, the device passes data from the
A inputs to the Y outputs. When OE is high, the
outputs are in the high-impedance state.
The outputs, which are designed to source or sink
up to 12 mA, include 33-Ω series resistors to
reduce overshoot and undershoot.
The SN54BCT2240 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT2240 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
Y
A
OE
L
H
L
L
H
Z
L
H
X
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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT2240, SN74BCT2240
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS030D – SEPTEMBER 1988 – REVISED APRIL 1994
†
logic symbol
logic diagram (positive logic)
1
1
1OE
1OE
EN
2
18
16
2
4
6
8
18
16
14
12
1A1
1Y1
1Y2
1
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
4
1A2
6
14
12
1A3
1Y3
1Y4
19
2OE
EN
8
1A4
11
13
15
17
9
7
5
3
1
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
19
2OE
9
7
11
2A1
2Y1
2Y2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
13
2A2
15
5
3
2A3
2Y3
2Y4
17
2A4
schematic of Y outputs
V
CC
Output
GND
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT2240, SN74BCT2240
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS030D – SEPTEMBER 1988 – REVISED APRIL 1994
†
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 7 V
I
Voltage range applied to any output in the disabled or power-off state, V . . . . . . . . . . . . . . . – 0.5 V to 5.5 V
O
Voltage range applied to any output in the high state, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to V
O
CC
Input clamp current, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA
IK
Current into any output in the low state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 mA
Operating free-air temperature range: SN54BCT2240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74BCT2240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
recommended operating conditions
SN54BCT2240
MIN NOM MAX
SN74BCT2240
UNIT
MIN NOM
MAX
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
IL
High-level input voltage
Low-level input voltage
Input clamp current
0.8
–18
–12
12
0.8
–18
–12
12
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
Operating free-air temperature
OH
OL
T
A
–55
125
0
70
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT2240, SN74BCT2240
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS
SCBS030D – SEPTEMBER 1988 – REVISED APRIL 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54BCT2240
SN74BCT2240
PARAMETER
TEST CONDITIONS
UNIT
V
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
= 4.5 V,
= 4.5 V
I = –18 mA
I
–1.2
–1.2
IK
CC
I
I
I
I
= –1 mA
= –12 mA
= 1 mA
2.4
2
3.3
3.2
2.4
2
3.3
3.2
OH
OH
OL
OL
V
OH
CC
0.15
0.35
0.5
0.8
0.1
20
0.15
0.35
0.5
0.8
0.1
20
V
OL
V
CC
= 4.5 V
V
= 12 mA
I
I
I
I
I
I
I
I
I
V
CC
V
CC
V
CC
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,
= 5.5 V,
= 5.5 V,
= 5.5 V,
V = 7 V
I
mA
µA
I
V = 2.7 V
I
IH
V = 0.5 V
I
–1
–1
mA
µA
IL
V
O
V
O
V
O
= 2.7 V
= 0.5 V
= 0
50
50
OZH
–50
–225
32
–50
–225
32
µA
OZL
‡
–100
–100
mA
mA
mA
mA
OS
Outputs open
Outputs open
Outputs open
19
46
6
19
46
6
CCH
CCL
CCZ
76
76
8
8
†
†
All typical values are at V
= 5 V, T = 25°C.
A
CC
Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C = 50 pF (unless otherwise noted) (see Note 2)
L
V
T
= 5 V,
= 25°C
CC
A
SN54BCT2240 SN74BCT2240
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
MIN
0.5
0.5
2.6
4.3
2
TYP
3.4
2.8
6.2
8.8
5.3
6.7
MAX
4.8
4
MIN
0.5
0.5
2.6
4.3
2
MAX
6.3
MIN
0.5
0.5
2.6
4.3
2
MAX
5.7
t
t
PLH
PHL
PZH
A
Y
Y
Y
ns
ns
ns
4.6
4.4
t
8.2
10.9
7.1
8.5
10.1
12.9
9.2
9.3
OE
OE
t
12.4
8.7
PZL
t
PHZ
t
2.2
2.2
12.2
2.2
10.6
PLZ
NOTE 2: Load circuit and voltage waveforms are shown in Section 1.
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
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any product or service without notice, and advise customers to obtain the latest version of relevant information
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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
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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.
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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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