SN74ABTH25245DW [TI]
25-W OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS; 具有三态输出25 -W八路总线收发器
| 型号： | SN74ABTH25245DW |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 25-W OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| 文件： | 总8页 (文件大小：133K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54ABTH25245, SN74ABTH25245
25-Ω OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS251F – JUNE 1992 – REVISED MAY 1997
SN54ABTH25245 . . . JT PACKAGE
SN74ABTH25245 . . . DW OR NT PACKAGE
(TOP VIEW)
State-of-the-Art EPIC-ΙΙB BiCMOS Design
Significantly Reduces Power Dissipation
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
A1
GND
A2
A3
GND
A4
A5
GND
A6
DIR
B1
B2
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
Latch-Up Performance Exceeds 500 mA Per
JEDEC Standard JESD-17
V
CC
B3
B4
B5
B6
Typical V
(Output Ground Bounce) < 1 V
OLP
at V
= 5 V, T = 25°C
CC
A
High-Impedance State During Power Up
and Power Down
V
CC
Designed to Facilitate Incident-Wave
Switching for Line Impedances of 25 Ω or
Greater
A7 10
15 B7
GND
A8
B8
OE
11
12
14
13
Distributed V
Minimizes High-Speed Switching Noise
and GND Pin Configuration
CC
SN54ABTH25245 . . . FK PACKAGE
(TOP VIEW)
Bus Hold on Data Inputs Eliminates the
Need for External Pullup/Pulldown
Resistors
Package Options Include Plastic
Small-Outline (DW) Package, Ceramic Chip
Carriers (FK), and Standard Plastic (NT)
and Ceramic (JT) DIPs
4
3
2 1 28 27 26
B3
5
25 OE
V
24 A8
23
6
CC
B2
7
GND
NC
A7
A6
GND
22
21
20
19
NC
B1
DIR
A1
8
description
9
The ’ABTH25245 are 25-Ω octal bus transceivers
designed for asynchronous communication
between data buses. They improve both the
performance and density of 3-state memory
address drivers, clock drivers, and bus-oriented
transceivers.
10
11
12 13 14 15 16 17 18
NC – No internal connection
These devices allow noninverted data
transmission from the A bus to the B bus or from
theBbustotheAbus, dependingonthelogiclevel
at the direction-control (DIR) input. The
output-enable (OE) input can disable the device
so that both buses are effectively isolated. When
OE is low, the device is active.
These transceivers are capable of sinking 188 mA of I current, which facilitates switching 25-Ω transmission
OL
linesontheincidentwave. ThedistributedV andGNDpinsminimizeswitchingnoiseformore-reliablesystem
CC
operation.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
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-ΙΙB is a trademark of Texas Instruments Incorporated.
Copyright 1997, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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
SN54ABTH25245, SN74ABTH25245
25-Ω OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS251F – JUNE 1992 – REVISED MAY 1997
description (continued)
When V
is between 0 and 2.1 V, the device is in the high-impedance state during power up or power down.
CC
However, to ensure the high-impedance state above 2.1 V, OE should be tied to V
the minimum value of the resistor is determined by the current-sinking capability of the driver.
through a pullup resistor;
CC
The SN54ABTH25245 is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74ABTH25245 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
OPERATION
OE
L
DIR
L
B data to A bus
A data to B bus
Isolation
L
H
H
X
†
logic symbol
13
24
G3
OE
DIR
3 EN1 [BA]
3 EN2 [AB]
1
23
A1
1
B1
2
3
22
20
19
18
17
15
14
A2
A3
A4
A5
A6
A7
A8
B2
B3
B4
B5
B6
B7
B8
4
6
7
9
10
12
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the DW, JT, and NT packages.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ABTH25245, SN74ABTH25245
25-Ω OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS251F – JUNE 1992 – REVISED MAY 1997
logic diagram (positive logic)
24
DIR
13
OE
1
A1
23
B1
To Seven Other Channels
Pin numbers shown are for the DW, JT, and NT 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 (except I/O ports) (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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 mA
IK
I
Output clamp current, I
(V < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA
OK
O
Current into any output in the low state, I : SN74ABTH25245 (A port) . . . . . . . . . . . . . . . . . . . . . . . . . 376 mA
O
SN74ABTH25245 (B port) . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Package thermal impedance, θ (see Note 2): DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81°C/W
JA
NT package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°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 negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. The package thermal impedance is calculated in accordance with EIA/JEDEC Std JESD51, except for through-hole packages,
which use a trace length of zero.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ABTH25245, SN74ABTH25245
25-Ω OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS251F – JUNE 1992 – REVISED MAY 1997
recommended operating conditions (see Note 3)
SN54ABTH25245 SN74ABTH25245
UNIT
MIN
4.5
2
MAX
MIN
4.5
2
MAX
V
CC
V
IH
V
IL
V
I
Supply voltage
5.5
5.5
V
V
High-level input voltage
Low-level input voltage
Input voltage
0.8
0.8
V
0
V
0
V
V
CC
CC
I
Input clamp current
–18
–80
–32
188
64
–18
–80
–32
188
64
mA
IK
A port
I
High-level output current
Low-level output current
Input transition rise or fall rate
mA
mA
OH
OL
B port
A port
I
B port
Control inputs
A or B ports
4
4
∆t/∆v
∆t/∆V
Outputs enabled
ns/V
10
10
Power-up ramp rate
200
–55
200
–40
µs/V
°C
CC
T
Operating free-air temperature
125
85
A
NOTE 3: Unused control pins must be held high or low to prevent them from floating.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ABTH25245, SN74ABTH25245
25-Ω OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS251F – JUNE 1992 – REVISED MAY 1997
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54ABTH25245
SN74ABTH25245
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
V
V
V
= 4.5 V,
= 4.75 V,
= 4.5 V,
= 4.5 V,
= 5 V,
I = –18 mA
–1.2
–1.2
V
IK
CC
CC
CC
CC
CC
CC
I
I
I
I
I
I
I
I
I
= –3 mA
= –80 mA
= –3 mA
= –3 mA
= –32 mA
= 94 mA
= 188 mA
= 64 mA
2.7
2.4
2.5
3
2.7
2.4
2.5
3
OH
OH
OH
OH
OH
OL
OL
OL
A port
V
OH
V
V
B port
= 4.5 V,
2*
2
0.55
0.7
0.55
0.7
A port
B port
V
= 4.5 V
= 4.5 V,
CC
CC
V
V
OL
V
0.55*
0.55
100
100
mV
hys
Control inputs
A or B ports
V
V
= 0 to 5.5 V,
V = V
or GND
or GND
±1
±1
CC
I
CC
CC
I
I
µA
I
= 2.1 V to 5.5 V,
V = V
I
±20
±20
CC
V = 0.8 V
I
100
100
A or B ports
V
CC
= 4.5 V
µA
I(hold)
V = 2 V
I
–100
–100
‡
V
V
V
V
V
= 0 to 2.1 V, V = 0.5 V to 2.7 V, OE = X
O
±50
±50
±100
50
±50
±50
±100
50
µA
µA
µA
µA
mA
µA
mA
µA
I
I
I
I
I
CC
CC
CC
CC
CC
OZPU
OZPD
off
‡
= 2.1 V to 0, V = 0.5 V to 2.7 V, OE = X
O
= 0,
V or V ≤ 4.5 V
I
O
= 5.5 V,
= 5.5 V,
V
O
V
O
= 5.5 V
CEX
§
B port
= 2.5 V
–50
–210
500
20
–50
–210
500
20
O
Outputs high
Outputs low
V
CC
= 5.5 V,
I
Outputs open,
CC
V = V
I
or GND
CC
Outputs disabled
500
500
V
= 5.5 V, One input at 3.4 V,
CC
Other inputs at V
¶
1
1
mA
∆I
CC
or GND
CC
C
C
Control inputs
A or B ports
V
V
= 5 V,
= 5 V,
V = V
or GND
4
4
pF
pF
i
CC
I
CC
= V or GND
CC
V
O
11.5
11.5
io
CC
* On products compliant to MIL-PRF-38535, this parameter does not apply.
†
‡
§
¶
All typical values are at V
= 5 V, T = 25°C.
A
CC
This parameter is characterized, but not production tested.
Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
This is the increase in supply current for each input that is at the specified TTL voltage level rather than V or GND.
CC
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ABTH25245, SN74ABTH25245
25-Ω OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS251F – JUNE 1992 – REVISED MAY 1997
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C = 50 pF (unless otherwise noted) (see Figure 1)
L
V
T
= 5 V,
= 25°C
CC
A
SN54ABTH25245 SN74ABTH25245
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
MIN
1
TYP
2.3
2.4
3.7
4
MAX
3.5
3.5
5.4
5.8
6.1
5.8
MIN
1
MAX
MIN
1
MAX
3.9
4.3
6.5
6.8
7.2
6.4
t
t
t
t
t
t
PLH
PHL
PZH
PZL
PHZ
PLZ
A or B
B or A
A or B
A or B
ns
ns
ns
1
1
1
1.5
1.4
2
1.5
1.4
2
1.5
1.4
2
OE
OE
4.3
3.9
2
2
2
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ABTH25245, SN74ABTH25245
25-Ω OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS251F – JUNE 1992 – REVISED MAY 1997
PARAMETER MEASUREMENT INFORMATION
7 V
S1
500 Ω
Open
GND
From Output
Under Test
TEST
S1
t
t
/t
Open
7 V
PLH PHL
/t
C
= 50 pF
L
t
500 Ω
PLZ PZL
/t
(see Note A)
Open
PHZ PZH
LOAD CIRCUIT
3 V
0 V
Timing Input
Data Input
1.5 V
t
w
t
t
h
su
3 V
3 V
0 V
Input
Input
1.5 V
1.5 V
1.5 V
1.5 V
0 V
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
3 V
0 V
3 V
0 V
Output
Control
1.5 V
1.5 V
1.5 V
1.5 V
t
PZL
t
t
PHL
PLH
t
PLZ
Output
Waveform 1
S1 at 7 V
V
V
3.5 V
OH
1.5 V
1.5 V
1.5 V
1.5 V
Output
V
V
+ 0.3 V
– 0.3 V
OL
V
OL
OL
(see Note B)
t
PHZ
t
PLH
t
t
PZH
PHL
Output
Waveform 2
S1 at Open
(see Note B)
V
OH
V
V
OH
OH
1.5 V
1.5 V
Output
≈ 0 V
OL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
NOTES: A.
C includes probe and jig 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. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z = 50 Ω, t ≤ 2.5 ns, t ≤ 2.5 ns.
O
r
f
D. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
7
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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