SN74AC245PW [TI]

OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS; 八路总线收发器与3态输出
SN74AC245PW
型号: SN74AC245PW
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
八路总线收发器与3态输出

总线驱动器 总线收发器 触发器 逻辑集成电路 光电二极管 输出元件
文件: 总6页 (文件大小:102K)
中文:  中文翻译
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SN54AC245, SN74AC245  
OCTAL BUS TRANSCEIVERS  
WITH 3-STATE OUTPUTS  
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996  
SN54AC245 . . . J OR W PACKAGE  
SN74AC245 . . . DB, DW, N, OR PW PACKAGE  
(TOP VIEW)  
EPIC (Enhanced-Performance Implanted  
CMOS) 1- m Process  
Package Options Include Plastic  
Small-Outline (DW), Shrink Small-Outline  
(DB), and Thin Shrink Small-Outline (PW)  
Packages, Ceramic Chip Carriers (FK), and  
Flatpacks (W), and Standard Plastic (N) and  
Ceramic (J) DIPs  
DIR  
A1  
A2  
A3  
A4  
V
CC  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
OE  
B1  
B2  
B3  
B4  
B5  
A5  
A6  
description  
A7  
A8  
GND  
13 B6  
The ’AC245 octal bus transceivers are designed  
for asynchronous two-way communication  
between data buses. The control-function  
implementation minimizes external timing  
requirements.  
12  
11  
B7  
B8  
SN54AC245 . . . FK PACKAGE  
(TOP VIEW)  
When the output-enable (OE) is low, the device  
passes noninverted data from the A bus to the B  
bus or from the B bus to the A bus, depending on  
the logic level at the direction control (DIR) input.  
A high on OE disables the device so that the buses  
are effectively isolated.  
3
2
1
20 19  
18  
B1  
B2  
B3  
A3  
A4  
A5  
A6  
A7  
4
5
6
7
8
17  
16  
The SN54AC245 is characterized for operation  
over the full military temperature range of 55°C  
to 125°C. The SN74AC245 is characterized for  
operation from 40°C to 85°C.  
15 B4  
14 B5  
9 10 11 12 13  
FUNCTION TABLE  
INPUTS  
OPERATION  
DIR  
OE  
L
L
H
L
H
X
B data to A bus  
A data to B bus  
Isolation  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
EPIC is a trademark of Texas Instruments Incorporated.  
Copyright 1996, 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.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
SN54AC245, SN74AC245  
OCTAL BUS TRANSCEIVERS  
WITH 3-STATE OUTPUTS  
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996  
logic diagram (positive logic)  
logic symbol  
19  
1
G3  
OE  
DIR  
1
DIR  
3EN1[BA]  
3EN2[AB]  
19  
18  
OE  
B1  
2
18  
A1  
B1  
1
2
A1  
2
3
4
5
6
7
8
9
17  
16  
15  
14  
13  
12  
11  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
B2  
B3  
B4  
B5  
B6  
B7  
B8  
To Seven Other Channels  
This symbol is in accordance with ANSI/IEEE Std 91-1984 and  
IEC Publication 617-12.  
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 V  
+ 0.5 V  
+ 0.5 V  
I
CC  
CC  
Output voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to V  
O
Input clamp current, I (V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA  
IK  
I
I
CC  
Output clamp current, I  
(V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA  
OK  
O O CC  
Continuous output current, I (V = 0 to V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA  
Continuous current through V  
Maximum power dissipation at T = 55°C (in still air)(see Note 2): DB package . . . . . . . . . . . . . . . . . . . 0.6 W  
O
O
CC  
CC  
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200 mA  
A
DW package . . . . . . . . . . . . . . . . . . 1.6 W  
N package . . . . . . . . . . . . . . . . . . . . 1.3 W  
PW package . . . . . . . . . . . . . . . . . . . 0.7 W  
Storage temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C  
stg  
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.  
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.  
2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils,  
except for the N package, which has a trace length of zero.  
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
SN54AC245, SN74AC245  
OCTAL BUS TRANSCEIVERS  
WITH 3-STATE OUTPUTS  
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996  
recommended operating conditions (see Note 3)  
SN54AC245  
SN74AC245  
UNIT  
MIN  
2
MAX  
MIN  
2
MAX  
V
V
Supply voltage  
6
6
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
= 3 V  
2.1  
2.1  
High-level input voltage  
= 4.5 V  
= 5.5 V  
= 3 V  
3.15  
3.85  
3.15  
3.85  
V
V
IH  
0.9  
1.35  
1.65  
0.9  
1.35  
1.65  
V
IL  
Low-level input voltage  
= 4.5 V  
= 5.5 V  
V
V
Input voltage  
0
0
V
0
0
V
V
V
I
CC  
CC  
Output voltage  
V
CC  
V
CC  
O
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
V
CC  
= 3 V  
–12  
–24  
–24  
12  
–12  
–24  
–24  
12  
I
High-level output current  
Low-level output current  
= 4.5 V  
= 5.5 V  
= 3 V  
mA  
mA  
OH  
I
= 4.5 V  
= 5.5 V  
24  
24  
OL  
24  
24  
t/ v  
Input transition rise or fall rate  
Operating free-air temperature  
0
8
0
8
ns/V  
T
–55  
125  
–40  
85  
°C  
A
NOTE 3: Unused inputs must be held high or low to prevent them from floating.  
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
SN54AC245, SN74AC245  
OCTAL BUS TRANSCEIVERS  
WITH 3-STATE OUTPUTS  
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996  
electrical characteristics over recommended operating free-air temperature range (unless  
otherwise noted)  
T
A
= 25°C  
SN54AC245  
SN74AC245  
PARAMETER  
TEST CONDITIONS  
V
UNIT  
CC  
MIN  
2.9  
TYP  
MAX  
MIN  
2.9  
4.4  
5.4  
2.4  
3.7  
4.7  
3.85  
MAX  
MIN  
2.9  
MAX  
3 V  
I
= –50  
A
4.5 V  
5.5 V  
3 V  
4.4  
4.4  
OH  
5.4  
5.4  
I
I
= –12 mA  
= –24 mA  
2.56  
3.86  
4.86  
2.46  
3.76  
4.76  
OH  
V
OH  
V
4.5 V  
5.5 V  
5.5 V  
5.5 V  
3 V  
OH  
I
I
= 50 mA  
= 75 mA  
OH  
3.85  
OH  
0.002  
0.001  
0.001  
0.1  
0.1  
0.1  
0.1  
0.1  
0.1  
I
= 50  
A
4.5 V  
5.5 V  
3 V  
OL  
0.1  
0.1  
0.1  
I
I
= 12 mA  
= 24 mA  
0.36  
0.36  
0.36  
0.5  
0.44  
0.44  
0.44  
OL  
V
OL  
V
4.5 V  
5.5 V  
5.5 V  
5.5 V  
0.5  
OL  
0.5  
I
I
= 50 mA  
1.65  
OL  
= 75 mA  
1.65  
±1  
OL  
A or B ports  
OE or DIR  
±0.1  
±0.1  
±1  
±1  
I
V = V or GND  
CC  
5.5 V  
5.5 V  
A
A
I
I
±1  
V
= V  
or GND,  
O
CC  
V (OE) = V or V  
IH  
I
I
±0.5  
±10  
±5  
OZ  
I
IL  
V = V  
or GND,  
or GND  
I = 0  
O
5.5 V  
5 V  
4
80  
40  
A
pF  
pF  
CC  
I
CC  
CC  
C
C
V = V  
4.5  
15  
i
I
V
= V or GND  
CC  
5 V  
io  
O
Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.  
For I/O ports, the parameter I includes the input leakage current.  
OZ  
switching characteristics over recommended operating free-air temperature range,  
= 3.3 V 0.3 V (unless otherwise noted) (see Figure 1)  
V
CC  
T = 25°C  
A
SN54AC245  
SN74AC245  
FROM  
(INPUT)  
TO  
(OUTPUT)  
PARAMETER  
UNIT  
ns  
MIN  
1.5  
1.5  
2.5  
2.5  
2
TYP  
5
MAX  
8.5  
MIN  
1
MAX  
11.5  
10  
MIN  
1
MAX  
9
t
t
PLH  
PHL  
PZH  
A or B  
B or A  
A or B  
A or B  
5
8.5  
1
1
9
t
7
11.5  
12  
1
13.5  
14.5  
13.5  
14  
2
12.5  
13.5  
12.5  
13  
ns  
OE  
OE  
t
7.5  
6.5  
7
1
2
PZL  
t
12  
1
1
PHZ  
ns  
t
2
11.5  
1
1.5  
PLZ  
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
SN54AC245, SN74AC245  
OCTAL BUS TRANSCEIVERS  
WITH 3-STATE OUTPUTS  
SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996  
switching characteristics over recommended operating free-air temperature range,  
= 5 V 5 V (unless otherwise noted) (see Figure 1)  
V
CC  
T
A
= 25°C  
TYP  
3.5  
SN54AC245  
SN74AC245  
FROM  
(INPUT)  
TO  
(OUTPUT)  
PARAMETER  
UNIT  
ns  
MIN  
1.5  
1.5  
1.5  
1.5  
1.5  
1.5  
MAX  
6.5  
6
MIN  
1
MAX  
8.5  
MIN  
1
MAX  
7
t
t
PLH  
PHL  
PZH  
A or B  
B or A  
A or B  
A or B  
3.5  
1
7.5  
1
7
t
5
8.5  
9
1
10  
1
9
ns  
OE  
OE  
t
5.5  
1
10.5  
10.5  
10.5  
1
9.5  
10  
10  
PZL  
t
5.5  
9
1
1
PHZ  
ns  
t
5.5  
9
1
1
PLZ  
operating characteristics, V  
= 5 V, T = 25°C  
A
CC  
PARAMETER  
Power dissipation capacitance per transceiver  
TEST CONDITIONS  
= 50 pF, f = 1 MHz  
L
TYP  
UNIT  
C
C
45  
pF  
pd  
PARAMETER MEASUREMENT INFORMATION  
2 × V  
CC  
TEST  
S1  
Open  
2 × V  
S1  
t
/t  
500 Ω  
Open  
PLH PHL  
From Output  
Under Test  
t
/t  
PLZ PZL  
CC  
Open  
t
/t  
PHZ PZH  
C
= 50 pF  
L
500 Ω  
(see Note A)  
LOAD CIRCUIT  
50%  
Output  
Control  
(low-level  
enabling)  
V
CC  
V
50% V  
50% V  
CC  
CC  
CC  
Input  
50%  
0 V  
t
PZL  
0 V  
PHL  
t
t
PLZ  
t
PLH  
Output  
Waveform 1  
V
CC  
V
OH  
50% V  
CC  
In-Phase  
Output  
V
V
+ 0.3 V  
– 0.3 V  
S1 at 2 × V  
(see Note B)  
OL  
50% V  
CC  
50% V  
CC  
CC  
V
V
OL  
V
OL  
t
PHZ  
t
t
PLH  
PZH  
t
Output  
Waveform 2  
S1 at Open  
(see Note B)  
PHL  
OH  
0 V  
V
OH  
OH  
Out-of-Phase  
Output  
50% V  
CC  
50% V  
50% V  
CC  
VOLTAGE WAVEFORMS  
C includes probe and jig capacitance.  
L
CC  
V
OL  
VOLTAGE WAVEFORMS  
NOTES: A.  
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.  
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.  
C. All input pulses are supplied by generators having the following characteristics: PRR 1 MHz, Z = 50 , t  
D. The outputs are measured one at a time with one input transition per measurement.  
2.5 ns, t  
f
2.5 ns.  
O
r
Figure 1. Load Circuit and Voltage Waveforms  
5
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  

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