SN74HC245DB [TI]
OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS; 八路总线收发器与3态输出
| 型号： | SN74HC245DB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| 文件： | 总7页 (文件大小：108K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131B – DECEMBER 1982 – REVISED MAY 1997
SN54HC245 . . . J OR W PACKAGE
SN74HC245 . . . DB, DW, N, OR PW PACKAGE
(TOP VIEW)
High-Current 3-State Outputs Drive Bus
Lines Directly or up to 15 LSTTL Loads
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Ceramic Flat (W) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
V
CC
OE
B1
B2
B3
B4
B5
B6
B7
B8
A2
A3
A4
A5
description
A6
A7
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. The control-function implementation
minimizes external timing requirements.
A8
GND
SN54HC245 . . . FK PACKAGE
(TOP VIEW)
The devices allow data transmission 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. The output-enable
(OE) input can be used to disable the device so
that the buses are effectively isolated.
3
2
1
20 19
18
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
4
5
6
7
8
17
16
15
14
The SN54HC245 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HC245 is characterized for
operation from –40°C to 85°C.
9 10 11 12 13
FUNCTION TABLE
INPUTS
OPERATION
OE
DIR
L
L
L
B data to A bus
A data to B bus
Isolation
H
H
X
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.
Copyright 1997, 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
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131B – DECEMBER 1982 – REVISED MAY 1997
†
logic symbol
19
G3
OE
1
DIR
3 EN1 [BA]
3 EN2 [AB]
2
18
A1
B1
1
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
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagram (positive logic)
1
2
DIR
19
18
OE
A1
B1
To Seven Other Channels
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131B – DECEMBER 1982 – REVISED MAY 1997
†
absolute maximum ratings over operating free-air temperature range
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
I
Input clamp current, I (V < 0 or V > V ) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
IK
I
CC
Output clamp current, I
(V < 0 or V > V ) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
OK
O O CC
Continuous output current, I (V = 0 to V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA
Continuous current through V
Package thermal impedance, θ (see Note 2): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115°C/W
O
O
CC
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA
JA
DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128°C/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 package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
recommended operating conditions
SN54HC245
MIN NOM
SN74HC245
MIN NOM
UNIT
MAX
MAX
V
V
Supply voltage
2
1.5
3.15
4.2
0
5
6
2
1.5
3.15
4.2
0
5
6
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 2 V
High-level input voltage
= 4.5 V
= 6 V
V
V
IH
= 2 V
0.5
1.35
1.8
0.5
1.35
1.8
V
IL
Low-level input voltage
= 4.5 V
= 6 V
0
0
0
0
V
V
Input voltage
0
V
V
0
V
V
V
V
I
CC
CC
Output voltage
0
0
O
CC
CC
V
CC
V
CC
V
CC
= 2 V
0
1000
500
400
125
0
1000
500
400
85
t
Input transition (rise and fall) time
Operating free-air temperature
= 4.5 V
= 6 V
0
0
ns
t
0
0
T
–55
–40
°C
A
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131B – DECEMBER 1982 – REVISED MAY 1997
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
= 25°C
SN54HC245
SN74HC245
A
PARAMETER
TEST CONDITIONS
V
UNIT
CC
MIN
TYP
MAX
MIN
1.9
4.4
5.9
3.7
5.2
MAX
MIN
1.9
MAX
2 V
4.5 V
6 V
1.9 1.998
4.4 4.499
5.9 5.999
I
= –20 µA
4.4
OH
V
V = V or V
IH
5.9
V
OH
I
IL
IL
I
I
= –6 mA
4.5 V
6 V
3.98
5.48
4.3
5.8
3.84
5.34
OH
= –7.8 mA
OH
2 V
0.002
0.001
0.001
0.17
0.1
0.1
0.1
0.1
0.1
0.1
I
= 20 µA
4.5 V
6 V
OL
V
V = V or V
0.1
0.1
0.1
V
OL
I
IH
I
I
= 6 mA
4.5 V
6 V
0.26
0.26
±100
±0.5
8
0.4
0.33
0.33
±1000
±5
OL
= 7.8 mA
0.15
0.4
OL
I
I
I
DIR or OE V = V
or 0
6 V
±0.1
±1000
±10
160
10
nA
µA
µA
pF
I
I
CC
CC
A or B
V
O
= V
or 0
6 V
±0.01
OZ
CC
CC
V = V
I
or 0,
I
O
= 0
6 V
80
C
DIR or OE
2 V to 6 V
3
10
10
i
switching characteristics over recommended operating free-air temperature range, C = 50 pF
L
(unless otherwise noted) (see Figure 1)
T
A
= 25°C
TYP
40
SN54HC245
SN74HC245
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
V
UNIT
CC
MIN
MAX
105
21
MIN
MAX
160
32
MIN
MAX
130
26
2 V
4.5 V
6 V
t
t
t
t
A or B
OE
B or A
A or B
A or B
A or B
15
ns
pd
en
dis
t
12
18
27
22
2 V
125
23
230
46
340
68
290
58
4.5 V
6 V
ns
ns
ns
20
39
58
49
2 V
74
200
40
300
60
250
50
OE
4.5 V
6 V
25
21
34
51
43
2 V
20
60
90
75
4.5 V
6 V
8
12
18
15
6
10
15
13
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131B – DECEMBER 1982 – REVISED MAY 1997
switching characteristics over recommended operating free-air temperature range, C = 150 pF
L
(unless otherwise noted) (see Figure 1)
T
A
= 25°C
TYP
54
SN54HC245
SN74HC245
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
V
UNIT
CC
MIN
MAX
135
27
MIN
MAX
200
40
MIN
MAX
170
34
2 V
4.5 V
6 V
t
pd
t
en
t
t
A or B
OE
B or A
A or B
A or B
18
ns
15
23
34
29
2 V
150
31
270
54
405
81
335
67
4.5 V
6 V
ns
ns
25
46
69
56
2 V
45
210
42
315
63
265
53
4.5 V
6 V
17
13
36
53
45
operating characteristics, T = 25°C
A
PARAMETER
Power dissipation capacitance per transceiver
TEST CONDITIONS
TYP
UNIT
C
No load
40
pF
pd
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCLS131B – DECEMBER 1982 – REVISED MAY 1997
PARAMETER MEASUREMENT INFORMATION
V
CC
PARAMETER
R
C
L
S1
S2
L
50 pF
or
150 pF
S1
S2
t
t
Open
Closed
Closed
Open
PZH
Test
Point
t
t
1 kΩ
1 kΩ
en
R
L
From Output
Under Test
PZL
t
t
Open
Closed
Open
PHZ
PLZ
50 pF
C
dis
L
Closed
(see Note A)
50 pF
or
150 pF
t
or t
––
Open
Open
pd
t
LOAD CIRCUIT
V
CC
Input
50%
50%
0 V
t
t
PLH
PHL
90%
V
V
OH
In-Phase
Output
90%
50%
10%
50%
10%
OL
t
Output
Control
(Low-Level
Enabling)
t
r
f
f
V
CC
t
t
PLH
PHL
90%
50%
50%
V
V
OH
90%
t
0 V
Out-of-Phase
Output
50%
10%
50%
10%
t
t
PLZ
PZL
OL
t
≈ V
≈ V
r
Output
Waveform 1
(See Note B)
CC
CC
50%
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
10%
90%
V
OL
t
PZH
V
CC
V
Output
Waveform 2
(See Note B)
OH
90%
t
90%
Input
50%
10%
50%
10%
50%
0 V
≈ 0 V
t
PHZ
t
r
f
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
NOTES: A.
C includes probe and test-fixture capacitance.
L
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. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, Z = 50 Ω, t = 6 ns, t = 6 ns.
O
r
f
D. The outputs are measured one at a time with one input transition per measurement.
E.
F.
G.
t
t
t
and t
and t
and t
are the same as t
are the same as t
are the same as t
.
dis
en
.
pd
PLZ
PZL
PLH
PHZ
PZH
PHL
.
Figure 1. Load Circuit and Voltage Waveforms
6
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
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
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BE FULLY AT THE CUSTOMER’S RISK.
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safeguards must be provided by the customer to minimize inherent or procedural hazards.
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party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated
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