SN74BCT25240NT [TI]
Octal 25 Ohm Buffers And Line Drivers 24-PDIP 0 to 70;
| 型号： | SN74BCT25240NT |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Octal 25 Ohm Buffers And Line Drivers 24-PDIP 0 to 70 驱动 信息通信管理 开关 光电二极管 逻辑集成电路 |
| 文件： | 总5页 (文件大小：68K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN74BCT25240
25-Ω OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS101B – JUNE 1990 – REVISED NOVEMBER 1993
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
4
V
CC
• Designed to Facilitate Incident-Wave
Switching for Line Impedances of 25 Ω
or Greater
5
1A3
1A4
2A1
2A2
6
7
• Distributed V
and GND Pins Minimize
Noise Generated by the Simultaneous
Switching of Outputs
8
CC
9
V
CC
10
11
12
2A3
2A4
2OE
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
description
This 25-Ω octal buffers and line driver is designed specifically to improve both the performance and density of
3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
The SN74BCT25240 is capable of sinking 188-mA I , which facilitates switching 25-Ω transmission lines on
OL
the incident wave. The distributed V
operation.
and GND pins minimize switching noise for more reliable system
CC
When the output-enable (1OE and 2OE) inputs are low, the device transmits the inverted A-input data to the
Y outputs. When 1OE and 2OE are high, the outputs are in the high-impedance state. 1OE affects only the 1Y
outputs; 2OE affects only the 2Y outputs.
The SN74BCT25240 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each buffer/driver)
INPUTS
OUTPUT
Y
A
OE
L
H
L
L
H
Z
L
H
X
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
SN74BCT25240
25-Ω OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS101B – JUNE 1990 – REVISED NOVEMBER 1993
†
logic symbol
logic diagram (positive logic)
24
24
1OE
1OE
EN
23
1
3
4
6
23
22
20
19
1
3
4
6
1A1
1Y1
1Y2
1Y3
1Y4
1
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
22
1A2
20
1A3
13
2OE
EN
19
1A4
18
17
15
14
7
9
1
2A1
2A2
2A3
2A4
2Y1
2Y2
2Y3
2Y4
10
12
13
2OE
18
7
9
†
2Y1
2Y2
2A1
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
17
2A2
15
10
2Y3
2Y4
2A3
14
12
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 applied to any output in the disabled or power-off state, V . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 5.5 V
O
Voltage 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA
O
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 negative-voltage rating may be exceeded if the input clamp-current rating is observed.
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN74BCT25240
25-Ω OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCBS101B – JUNE 1990 – REVISED NOVEMBER 1993
recommended operating conditions (see Note 2)
MIN NOM
MAX
UNIT
V
V
V
V
Supply voltage
4.5
2
5
5.5
CC
IH
IL
High-level input voltage
Low-level input voltage
Input clamp current
V
0.5
–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
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)
†
PARAMETER
TEST CONDITIONS
I = –18 mA
MIN TYP
MAX
UNIT
V
IK
V
V
V
= 4.5 V,
= 4.75 V,
= 4.5 V,
–1.2
V
CC
CC
CC
I
I
I
I
I
= – 3 mA
= –80 mA
= 94 mA
2.7
2
OH
OH
OL
OL
V
OH
V
V
0.42
0.55
0.7
0.1
20
V
OL
V
CC
= 4.5 V
= 188 mA
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
mA
µA
mA
µA
µA
mA
mA
mA
pF
I
V = 2.7 V
I
IH
V = 0.5 V
I
–0.6
50
IL
V
= 2.7 V
= 0.5 V
OZH
OZL
CCL
CCH
CCZ
O
O
V
–50
127
55
Outputs open
Outputs open
Outputs open
90
39
7
10
C
C
V = 2.5 V or 0.5 V
I
6.5
16.5
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
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
MIN
MAX
UNIT
MIN
0.6
0.5
1.8
3.7
1.2
2.7
TYP
2.8
2.1
4.3
6.5
3.9
5.8
MAX
4.4
3.6
6.2
8.7
5.7
8.2
t
t
t
t
t
t
0.6
0.5
1.8
3.7
1.2
2.7
5
3.7
PLH
PHL
PZH
PZL
PHZ
PLZ
A
Y
Y
Y
ns
ns
ns
7.2
OE
OE
10.3
6.7
8.9
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
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Copyright 1998, Texas Instruments Incorporated
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