SN74BCT25244DW [TI]
25-ohm OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS; 25欧姆八路缓冲器/带3态输出驱动程序
| 型号： | SN74BCT25244DW |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 25-ohm OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| 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 |
SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993
SN54BCT25244 . . . JT OR W PACKAGE
SN74BCT25244 . . . DW OR NT PACKAGE
(TOP VIEW)
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
1
24
23
22
21
20
19
18
17
16
15
14
13
1Y1
GND
1Y2
1Y3
GND
1Y4
2Y1
GND
2Y2
2Y3
GND
2Y4
1OE
1A1
1A2
2
3
• Designed to Facilitate Incident-Wave
Switching for Line Impedances of 25 Ω
or Greater
4
V
CC
5
1A3
1A4
2A1
2A2
6
7
• Distributed V
and GND Pins Minimize
Noise Generated by the Simultaneous
Switching of Outputs
CC
8
9
V
CC
10
11
12
2A3
2A4
2OE
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(JT, NT)
SN54BCT25244 . . . FK PACKAGE
(TOP VIEW)
description
These 25-Ω 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.
4
3 2 1 28 27 26
1A3
5
6
7
8
9
25 2OE
V
24 2Y4
23
CC
1A2
GND
NC
2Y3
2Y2
GND
22
21
20
19
NC
1A1
1OE
1Y1
These buffers are capable of sinking 188-mA I
,
OL
which facilitates switching 25-Ω transmission
lines on the incident wave. The distributed V
10
11
CC
and GND pins minimize switching noise for more
reliable system operation.
12 13 14 15 16 17 18
When the output-enable (1OE and 2OE) inputs
are low, the device transmits data from the
A inputs to the Y outputs. When 1OE and 2OE are
high, the outputs are in the high-impedance state.
NC – No internal connection
The SN54BCT25244 is characterized for
operation over the full military temperature range
of –55°C to 125°C. The SN74BCT25244 is
characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer/driver)
INPUTS
OUTPUT
Y
OE
A
H
L
L
L
H
L
H
X
Z
Copyright 1993, 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
SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993
†
logic symbol
logic diagram (positive logic)
24
24
1OE
1OE
EN
23
22
20
19
1
3
4
6
23
1
3
4
6
1Y1
1Y2
1Y3
1Y4
1A1
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
1
22
1A2
20
1A3
13
2OE
EN
19
1A4
18
17
15
14
7
9
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
1
10
12
13
2OE
18
7
9
2A1
2Y1
2Y2
2Y3
2Y4
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
17
2A2
15
10
12
2A3
14
2A4
Pin numbers shown are for the DW, JT, NT, and W packages.
‡
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 (V < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA
IK
I
Current into any output in the low state, I : SN54BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA
O
SN74BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA
Operating free-air temperature range: SN54BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
SN74BCT25244 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993
recommended operating conditions (see Note 2)
SN54BCT25244
SN74BCT25244
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
–53
125
125
0.8
–18
–80
188
70
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
0
NOTE 2: Unused or floating inputs must be held high or low.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54BCT25244
SN74BCT25244
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
= 4.5 V,
I = –18 mA
–1.2
–1.2
V
IK
CC
I
= 4.75 V,
I
I
I
I
I
I
= – 3 mA
= –53 mA
= –80 mA
= 94 mA
2.7
2
CC
OH
OH
OH
OL
OL
OL
V
OH
2
V
V
V
= 4.5 V
= 4.5 V
CC
CC
0.38
0.55
0.8
0.42
0.55
V
OL
V
= 125 mA
= 188 mA
0.7
0.1
20
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
= 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 = 5.5 V
I
0.1
20
mA
µA
mA
µA
µA
mA
mA
mA
pF
I
V = 2.7 V
I
IH
V = 0.5 V
I
–0.6
50
–0.6
50
IL
V
= 2.7 V
= 0.5 V
OZH
OZL
CCL
CCH
CCZ
O
O
V
–50
119
78
–50
119
78
Outputs open
Outputs open
Outputs open
90
59
7
90
59
7
11
11
C
C
V = 2.5 V or 0.5 V
I
5.5
17
5.5
17
i
= 5 V,
V
O
= 2.5 V or 0.5 V
pF
o
†
All typical values are at V
= 5 V, T = 25°C.
A
CC
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C = 50 pF (unless otherwise noted) (see Note 3)
L
V
T
= 5 V,
= 25°C
CC
A
SN54BCT25244
SN74BCT25244
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
MIN
1
TYP
3.2
4
MAX
4.9
5.6
8.5
9.2
5.5
7.8
MIN
1
MAX
5.6
MIN
1
MAX
5.5
6
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A
Y
Y
Y
ns
ns
ns
2
2
6.3
2
3.2
3.7
1.6
3.1
5.6
6.3
3.6
5.3
3.2
3.7
1.6
3.1
9.7
3.2
3.7
1.6
3.1
9.3
10.2
6.3
8.4
OE
OE
10.4
6.5
9.5
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–4
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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.
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Copyright 1998, Texas Instruments Incorporated
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