Texas Instruments SN74ABT245BN Bedienungsanleitung


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SN54ABT245A, SN74ABT245B
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS081L − JANUARY 1991 − REVISED APRIL 2005
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
DTypical VOLP (Output Ground Bounce)
<1 V at VCC = 5 V, TA = 25°C
DIoff and Power-Up 3-State Support Hot
Insertion
DHigh-Drive Outputs (−32-mA IOH, 64-mA IOL)
DLatch-Up Performance Exceeds 500 mA Per
JEDEC Standard JESD 17
DESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
SN54ABT245A . . . J OR W PACKAGE
SN74ABT245B . . . DB, DGV, DW, N, NS,
OR PW PACKAGE
(TOP VIEW)
3 2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
B1
B2
B3
B4
B5
A3
A4
A5
A6
A7
A2
A1
DIR
B7
B6 OE
A8
GND
B8
VCC
SN54ABT245B . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
SN74ABT245B . . . RGY PACKAGE
(TOP VIEW)
1 20
10 11
2
3
4
5
6
7
8
9
19
18
17
16
15
14
13
12
OE
B1
B2
B3
B4
B5
B6
B7
A1
A2
A3
A4
A5
A6
A7
A8
DIR
B8 V
GND
CC
description/ordering information
These octal bus transceivers are designed for asynchronous communication between data buses. The devices
transmit 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. The output-enable (OE ) input can be used to disable the device so the buses are
effectively isolated.
ORDERING INFORMATION
TAPACKAGEORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N Tube SN74ABT245BN SN74ABT245BN
QFN − RGY Tape and reel SN74ABT245BRGYR AB245B
SOIC DW
Tube SN74ABT245BDW
ABT245B
SOIC − DW Tape and reel SN74ABT245BDWR ABT245B
SOP − NS Tape and reel SN74ABT245BNSR ABT245B
−40° °C to 85 C SSOP − DB Tape and reel SN74ABT245BDBR AB245B
40 C
to
85 C
TSSOP PW
Tube SN74ABT245BPW
AB245B
TSSOP − PW Tape and reel SN74ABT245BPWR AB245B
TVSOP − DGV Tape and reel SN74ABT245BDGVR AB245B
VFBGA − GQN
Tape and reel
SN74ABT245BGQNR
AB245B
VFBGA − ZQN (Pb-free) Tape and reel SN74ABT245BZQNR AB245B
CDIP − J Tube SNJ54ABT245AJ SNJ54ABT245AJ
−55° °C to 125 C CFP − W Tube SNJ54ABT245AW SNJ54ABT245AW
55 C
to
125 C
LCCC − FK Tube SNJ54ABT245AFK SNJ54ABT245AFK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available
at www.ti.com/sc/package.
Copyright © 2005, 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.
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.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN54ABT245A, SN74ABT245B
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS081L − JANUARY 1991 − REVISED APRIL 2005
2POST OFFICE BOX 655303 DALLAS, TEXAS 75265
description/ordering information (continued)
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
This device is fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry
disables the outputs, preventing damaging current backflow through the device when it is powered down. The
power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.
terminal assignments
1 2 3 4
AA1 DIR VCC OE
BA3 B2 A2 B1
CA5 A4 B4 B3
DA7 B6 A6 B5
EGND A8 B8 B7
FUNCTION TABLE
INPUTS
OPERATION
OE DIR OPERATION
L L B data to A bus
L H A data to B bus
H X Isolation
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
Pin numbers shown are for the DB, DGV, DW, FK, J, N, NS, PW, RGY, and W packages.
SN74ABT245B . . . GQN OR ZQN PACKAGE
(TOP VIEW)
1234
A
B
C
D
E
SN54ABT245A, SN74ABT245B
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS081L − JANUARY 1991 − REVISED APRIL 2005
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (except I/O ports) (see Note 1) −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or power-off state, VO −0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . .
Current into any output in the low state, IO: SN54ABT245A 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ABT245B 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0) −18 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0) −50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): DB package 70°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 2): DGV package 92°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 2): DW package 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 2): GQN/ZQN package 78°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 2): N package 69°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 2): NS package 60°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 2): PW package 83°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(see Note 3): RGY package 37°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg −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.
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 JESD 51-7.
3. The package thermal impedance is calculated in accordance with JESD 51-5.
recommended operating conditions (see Note 4)
SN54ABT245A SN74ABT245B
UNIT
MIN MAX MIN MAX UNIT
VCC Supply voltage 4.5 5.5 4.5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.8 0.8 V
VIInput voltage 0 VCC 0 VCC V
IOH High-level output current −24 −32 mA
IOL Low-level output current 48 64 mA
Δ Δt/ v 5 5 ns/VInput transition rise or fall rate
Δ Δt/ VCC Power-up ramp rate 200 s/Vμ
TAOperating free-air temperature −55 125 −40 85 C°
NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.


Produktspezifikationen

Marke: Texas Instruments
Kategorie: Nicht kategorisiert
Modell: SN74ABT245BN

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