SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
•
•
3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
Package Options Include Plastic
Small-Outline (SOIC) and Shrink
Small-Outline (SSOP) Packages, Ceramic
Chip Carriers, and Plastic and Ceramic
DIPs
SN54F240 . . . J PACKAGE
SN74F240 . . . DB, DW, OR N PACKAGE
(TOP VIEW)
description
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
′F241
and
′F244,
these devices provide the choice of
selected combinations of inverting and
noninverting outputs, symmetrical OE (active-low
output-enable) inputs, and complementary OE
and OE inputs.
The
′F240
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 SN74F240 is available in TI’s shrink
small-outline package (DB), which provides the
same I/O pin count and functionality of standard
small-outline packages in less than half the
printed-circuit-board area.
The SN54F240 is characterized for operation over
the full military temperature range of – 55°C to
125°C. The SN74F240 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer)
INPUTS
OE
L
L
H
A
H
L
X
OUTPUT
Y
L
H
Z
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
SN54F240 . . . FK PACKAGE
(TOP VIEW)
2Y4
1A1
1OE
V
CC
1A2
2Y3
1A3
2Y2
1A4
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
2OE
1Y1
2A4
1Y2
2A3
1Y3
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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2Y1
GND
2A1
1Y4
2A2
Copyright
©
1993, Texas Instruments Incorporated
2–1
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
logic symbol
†
1OE
1
EN
18
16
14
12
logic diagram (positive logic)
1
1OE
18
1A1
1A2
1A3
1A4
2
4
6
8
2
1Y1
1Y2
1Y3
1Y4
6
1A3
1A2
4
1A1
1Y1
16
1Y2
14
1Y3
12
1Y4
2OE
19
EN
8
9
7
5
3
1A4
2Y1
2Y2
2Y3
2Y4
11
2OE
19
2A1
2A2
2A3
2A4
11
13
15
17
9
2Y1
7
2Y2
5
2Y3
3
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
2A1
13
2A2
15
2A3
17
2A4
2Y4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage range, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Input voltage range, V
I
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 1.2 V to 7 V
Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA to 5 mA
Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . – 0.5 V to 5.5 V
Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to V
CC
Current into any output in the low state: SN54F240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
SN74F240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Operating free-air temperature range: SN54F240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74F240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 voltage ratings may be exceeded provided the input current ratings are observed.
2–2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
recommended operating conditions
SN54F240
MIN
VCC
VIH
VIL
IIK
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature
– 55
4.5
2
0.8
– 18
– 12
48
125
0
NOM
5
MAX
5.5
SN74F240
MIN
4.5
2
0.8
– 18
– 15
64
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
mA
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VCC = 4.5 V,
VCC = 4.5 V
VCC = 4.75 V,
VOL
IOZH
IOZL
II
IIH
IIL
IOS‡
ICC
VCC = 4 5 V
4.5
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V
TEST CONDITIONS
II = – 18 mA
IOH = – 3 mA
IOH = – 12 mA
IOH = – 15 mA
IOH = – 3 mA
IOL = 48 mA
IOL = 64 mA
VO = 2.7 V
VO = 0.5 V
VI = 7 V
VI = 2.7 V
VI = 0.5 V
VO = 0
Outputs high
Outputs low
Outputs disabled
– 100
19
50
42
SN54F240
MIN TYP†
MAX
– 1.2
2.4
2
3.3
3.2
2
2.7
0.38
0.55
0.42
50
– 50
0.1
20
–1
– 225
29
75
63
– 100
19
50
42
0.55
50
– 50
0.1
20
–1
– 225
29
75
63
mA
V
µA
µA
mA
µA
mA
mA
3.1
2.4
3.3
V
SN74F240
MIN TYP†
MAX
– 1.2
UNIT
V
VOH
† All typical values are at VCC = 5 V, TA = 25°C.
‡ Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
2–3
SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993
switching characteristics (see Note 2)
VCC = 5 V,
CL = 50 pF,
RL = 500
Ω,
TA = 25°C
′F240
MIN
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Any A
Y
Y
Y
2.2
1.2
1.2
3.2
1.2
1.2
TYP
4.7
3.1
3.1
6.5
3.6
5.6
MAX
7
4.7
5.3
9
5.3
8
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
Ω,
TA = MIN to MAX†
SN54F240
MIN
2.2
1.2
1.2
3.2
1.2
1.2
MAX
9
6
6.7
10.5
6.5
12.5
SN74F240
MIN
2.2
1.2
1.2
3.2
1.2
1.2
MAX
8
5.7
6.1
10
6.3
9.5
ns
ns
ns
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
UNIT
OE
OE
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and waveforms are shown in Section 1.
2–4
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
能源基础设施
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
