SN74BCT240NSR [TI]
OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS;
| 型号： | SN74BCT240NSR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS 驱动 输出元件 |
| 文件： | 总5页 (文件大小：76K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
SN54BCT240 . . . J OR W PACKAGE
SN74BCT240 . . . DB, DW OR N PACKAGE
(TOP VIEW)
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• ESD Protection Exceeds 2000 V
Per MIL-STD-883C, Method 3015
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
• 3-State Outputs Drive Bus Lines or Buffer
2OE
1Y1
2A4
1Y2
2A3
1Y3
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)
13 2A2
12 1Y4
11
2A1
description
SN54BCT240 . . . 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
transmitters. Taken together with the ′BCT241
and ′BCT244, these devices provide the choice of
selected combinations of inverting and
noninverting outputs, symmetrical OE (active-low
output-enable) inputs, and complementary OE
andOE inputs. These devices feature high fan-out
and improved fan-in.
3
2
1
20 19
18
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
17
16
15
14
9 10 11 12 13
The ′BCT240 is organized as two 4-bit buffers/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 SN54BCT240 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT240 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
Y
OE
A
H
L
L
L
L
H
Z
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
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
†
logic symbol
logic diagram (positive logic)
1
1
1OE
EN
1OE
2
18
16
2
4
6
8
18
16
14
12
1Y1
1Y2
1Y3
1Y4
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
1A1
4
1A2
6
14
12
1A3
19
2OE
EN
8
1A4
11
13
15
17
9
7
5
3
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
19
2OE
11
9
7
5
3
2Y1
2Y2
†
2A1
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
13
2A2
15
2Y3
2Y4
2A3
17
2A4
‡
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: SN54BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
SN74BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Operating free-air temperature range: SN54BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74BCT240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
recommended operating conditions
SN54BCT240
SN74BCT240
MIN NOM MAX
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
48
0.8
–18
–15
64
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
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54BCT240
SN74BCT240
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
= 4.5 V,
= 4.5 V
I = –18 mA
–1.2
–1.2
V
IK
CC
I
I
I
I
I
I
= –3 mA
= –12 mA
= –15 mA
= 48 mA
= 64 mA
2.4
2
3.3
3.2
2.4
2
3.3
3.1
OH
OH
OH
OL
OL
V
OH
V
CC
0.38
0.55
V
V
CC
= 4.5 V
V
OL
0.42
0.55
0.1
20
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
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,
= 5 V,
V = 7 V
I
0.1
20
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
–50
–225
31
µA
OZL
‡
–100
–225 –100
mA
mA
mA
mA
pF
OS
Outputs open
Outputs open
Outputs open
19
46
6
31
71
9
19
46
6
CCH
CCL
CCZ
71
9
C
C
V = 2.5 V or 0.5 V
I
6
6
i
= 5 V,
V
O
= 2.5 V or 0.5 V
11
11
pF
o
†
‡
All typical values are at V
= 5 V.
CC
Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT240, SN74BCT240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS004E – OCTOBER 1987 – REVISED APRIL 1994
switching characteristics (see Note 2)
V
C
= 5 V,
= 50 pF,
V
= 4.5 V to 5.5 V,
C = 50 pF,
L
CC
L
CC
R1 = 500 Ω,
R2 = 500 Ω,
T
A
R1 = 500 Ω,
R2 = 500 Ω,
†
T = MIN to MAX
A
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
= 25°C
′BCT240
TYP
3.3
SN54BCT240 SN74BCT240
MIN
0.5
0.4
1
MAX
4.8
3.5
7.9
9.4
6.8
8.1
MIN
0.5
0.4
1
MAX
6.4
MIN
0.5
0.4
1
MAX
5.6
4
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A
Y
Y
Y
ns
ns
ns
1.8
4.5
6.4
9.2
8.8
10.5
8.1
9.5
OE
OE
1
7.5
1
10.8
8.5
1
1
6
1
1
1
6.7
1
10.6
1
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits 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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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
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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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