Texas Instruments SN54ALS245AJ, SN54AS245J, SN74ALS245A-1DW, SN74ALS245A-1DWR, SN74ALS245A-1N Datasheet
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SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS272 ± NOVEMBER 1994
•3-State Outputs Drive Bus Lines Directly
•pnp Inputs Reduce dc Loading
•Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
description
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements.
The devices allow data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the direction-control (DIR) input. The output-enable
SN54ALS245A, SN54AS245 . . . J PACKAGE SN74ALS245A, SN74AS245 . . . DW OR N PACKAGE
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DIR |
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VCC |
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1 |
20 |
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A1 |
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2 |
19 |
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OE |
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A2 |
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3 |
18 |
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B1 |
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A3 |
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4 |
17 |
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B2 |
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A4 |
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5 |
16 |
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B3 |
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A5 |
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6 |
15 |
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B4 |
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A6 |
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7 |
14 |
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B5 |
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A7 |
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8 |
13 |
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B6 |
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A8 |
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9 |
12 |
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B7 |
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GND |
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10 |
11 |
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B8 |
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SN54ALS245A, SN54AS245 . . . FK PACKAGE
(TOP VIEW)
(OE) input can be used to disable the device so that the buses are effectively isolated.
The -1 version of the SN74ALS245A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. There is no -1 version of the SN54ALS245A.
The SN54ALS245A and SN54AS245 are characterized for operation over the full military temperature range of ±55°C to 125°C. The SN74ALS245A and SN74AS245 are characterized for operation from 0°C to 70°C.
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A2 |
A1 |
DIR |
CC |
OE |
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V |
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A3 |
3 |
2 |
1 |
20 19 |
B1 |
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4 |
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18 |
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A4 |
5 |
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17 |
B2 |
A5 |
6 |
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16 |
B3 |
A6 |
7 |
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15 |
B4 |
A7 |
8 |
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14 |
B5 |
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9 |
10 11 12 13 |
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A8 |
GND |
B8 |
B7 |
B6 |
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FUNCTION TABLE
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INPUTS |
OPERATION |
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OE |
DIR |
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L |
L |
B data to A bus |
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L |
H |
A data to B bus |
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H |
X |
Isolation |
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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.
Copyright 1994, Texas Instruments Incorporated
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
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SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245 OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS272 ± NOVEMBER 1994
logic symbol² |
logic diagram (positive logic) |
OE |
19 |
G3 |
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DIR |
1 |
3EN1[BA] |
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3EN2[AB] |
A1 |
2 |
18 |
1 |
B1 |
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2 |
A2 |
3 |
17 |
4 |
B2 |
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A3 |
16 |
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5 |
B3 |
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A4 |
15 |
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B4 |
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A5 |
6 |
14 |
7 |
B5 |
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A6 |
13 |
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8 |
B6 |
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A7 |
12 |
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9 |
B7 |
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A8 |
11 |
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B8 |
1
DIR
19
OE
2
A1
18
B1
To Seven Other Channels
²This 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)³
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . . 7 |
V |
Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . . 7 |
V |
I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . 5.5 |
V |
Operating free-air temperature range, TA: SN54ALS245A . . . . . . . . . . . . . . . . . . . . . . . . . . . |
±55°C to 125°C |
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SN74ALS245A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 0°C to 70°C |
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Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
±65°C to 150°C |
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³Stresses beyond those listed under ªabsolute maximum ratingsº 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 ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
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SN54ALS245A |
SN74ALS245A |
UNIT |
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MIN |
NOM |
MAX |
MIN |
NOM |
MAX |
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VCC |
Supply voltage |
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4.5 |
5 |
5.5 |
4.5 |
5 |
5.5 |
V |
VIH |
High-level input voltage |
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2 |
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2 |
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V |
VIL |
Low-level input voltage |
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0.7 |
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0.8 |
V |
IOH |
High-level output current |
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± 12 |
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± 15 |
mA |
IOL |
Low-level output current |
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12 |
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24 |
mA |
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48§ |
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TA |
Operating free-air temperature |
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± 55 |
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125 |
0 |
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70 |
°C |
§ Applies only to the -1 version and only if V |
CC |
is between 4.75 V and 5.25 V |
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POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS272 ± NOVEMBER 1994
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
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PARAMETER |
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TEST CONDITIONS |
SN54ALS245A |
SN74ALS245A |
UNIT |
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MIN |
TYP² |
MAX |
MIN |
TYP² |
MAX |
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VIK |
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VCC = 4.5 V, |
II = ± 18 mA |
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±1.5 |
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±1.5 |
V |
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VCC = 4.5 V to 5.5 V, |
IOH = ± 0.4 mA |
VCC ± 2 |
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VCC ± 2 |
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VOH |
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IOH = ± 3 mA |
2.4 |
3.2 |
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2.4 |
3.2 |
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V |
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VCC = 4.5 V |
IOH = ± 12 mA |
2 |
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IOH = ± 15 mA |
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2 |
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IOL= 12 mA |
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0.25 |
0.4 |
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0.25 |
0.4 |
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VOL |
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VCC = 4.5 V |
IOL = 24 mA |
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0.35 |
0.5 |
V |
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I |
= 48 mA³ |
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0.35 |
0.5 |
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OL |
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II |
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Control inputs |
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VCC = 5.5 V |
VI = 7 V |
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0.1 |
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0.1 |
mA |
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A or B ports |
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VI = 5.5 V |
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0.1 |
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0.1 |
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IIH |
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Control inputs |
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VCC = 5.5 V, |
VI = 2.7 V |
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20 |
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20 |
μA |
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A or B ports§ |
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20 |
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20 |
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IIL |
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Control inputs |
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VCC = 5.5 V, |
VI = 0.4 V |
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± 0.1 |
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± 0.1 |
mA |
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A or B ports§ |
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± 0.1 |
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± 0.1 |
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I |
O |
¶ |
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V |
= 5.5 V, |
V |
= 2.25 V |
± 20 |
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±112 |
± 30 |
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±112 |
mA |
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CC |
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O |
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Outputs high |
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30 |
48 |
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30 |
45 |
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ICC |
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VCC = 5.5 V |
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mA |
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Outputs low |
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36 |
60 |
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36 |
55 |
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Outputs disabled |
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38 |
63 |
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38 |
58 |
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² |
All typical values are V |
CC |
= 5 V, T |
= 25°C. |
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³ |
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A |
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Applies only to the -1 version and only if V is between 4.75 V and 5.25 V |
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CC |
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§For I/O ports, the parameters IIH and IIL include the off-state output current.
¶The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
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VCC = 4.5 V to 5.5 V, |
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CL = 50 pF, |
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FROM |
TO |
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R1 = 500 |
Ω, |
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R2 = 500 |
Ω |
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PARAMETER |
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, |
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UNIT |
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(INPUT) |
(OUTPUT) |
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TA = MIN to MAX# |
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SN54ALS245A |
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SN74ALS245A |
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MIN |
MAX |
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MIN |
MAX |
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tPLH |
A or B |
B or A |
1 |
19 |
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3 |
10 |
ns |
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tPHL |
1 |
14 |
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3 |
10 |
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tPZH |
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A or B |
2 |
30 |
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5 |
20 |
ns |
OE |
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tPZL |
2 |
29 |
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5 |
20 |
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tPHZ |
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A or B |
2 |
14 |
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2 |
10 |
ns |
OE |
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tPLZ |
2 |
30 |
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4 |
15 |
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# For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
3 |
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