Texas Instruments SN74AC245N, SN74AC245PWLE, SN74AC245PWR, SN74AC245DBLE, SN74AC245DBR Datasheet

OPERATION

SN54AC245, SN74AC245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996

D

EPIC

t

(Enhanced-Performance Implanted

CMOS) 1-mm Process

D

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

description

The ’AC245 octal bus transceivers are designed
for asynchronous two-way communication
between data buses. The control-function
implementation minimizes external timing
requirements.

When the output-enable (OE
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.

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.

) is low, the device

SN54AC245 ...J OR W PACKAGE

SN74AC245 . . . DB, DW, N, OR PW PACKAGE

SN54AC245 . . . FK PACKAGE

A3
A4
A5
A6
A7

(TOP VIEW)

DIR

A1
A2
A3
A4
A5
A6
A7
A8

GND

(TOP VIEW)

A2A1DIR

3 2 1 20 19

4
5
6
7
8

9 10 11 12 13

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

V

CC

18
17
16
15
14

V
OE
B1
B2
B3
B4
B5
B6
B7
B8

CC

B1
B2
B3
B4
B5

B7

B8

B6 OE

A8

GND

FUNCTION TABLE

INPUTS

OE

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.

DIR

L
L

H

L
H
X

B data to A bus
A data to B bus

Isolation

EPIC is a trademark of 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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1996, Texas Instruments Incorporated

1

SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996

logic symbol

19

OE

1

DIR

2

A1

3

A2

4

A3

5

A4

6

A5

7

A6

8

A7

9

A8

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.

†

G3
3EN1[BA]

3EN2[AB]

1

18

2

17
16
15
14
13
12
11

B1

B2
B3
B4
B5
B6
B7
B8

logic diagram (positive logic)

1

DIR

2

A1

To Seven Other Channels

19

18

OE

B1

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage range, V

CC

Input voltage range, VI (see Note 1) –0.5 V to VCC+ 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, VO (see Note 1) –0.5 V to VCC+ 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, I
Output clamp current, I
Continuous output current, I

(V

< 0 or VI > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IK

I

(V

< 0 or VO > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OK

O

(V

= 0 to VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

O

Continuous current through VCC or GND ±200 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum power dissipation at TA = 55°C (in still air)(see Note 2): DB package 0.6 W. . . . . . . . . . . . . . . . . . .

DW package 1.6 W. . . . . . . . . . . . . . . . . .

N package 1.3 W. . . . . . . . . . . . . . . . . . . .

PW package 0.7 W. . . . . . . . . . . . . . . . . . .

Storage temperature range, T

‡

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.

stg

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

UNIT

SN54AC245, SN74AC245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996

recommended operating conditions (see Note 3)

SN54AC245 SN74AC245

MIN MAX MIN MAX

V

CC

V

IH

V

IL

V

I

V

O

I

OH

I

OL

Dt/D

T

A

NOTE 3: Unused inputs must be held high or low to prevent them from floating.

Supply voltage 2 6 2 6 V

VCC = 3 V 2.1 2.1

High-level input voltage

Low-level input voltage

Input voltage 0 V
Output voltage 0 V

High-level output current

Low-level output current

v Input transition rise or fall rate 0 8 0 8 ns/V

Operating free-air temperature –55 125 –40 85 °C

VCC = 4.5 V
VCC = 5.5 V 3.85 3.85
VCC = 3 V 0.9 0.9
VCC = 4.5 V
VCC = 5.5 V 1.65 1.65

VCC = 3 V –12 –12
VCC = 4.5 V
VCC = 5.5 V –24 –24
VCC = 3 V 12 12
VCC = 4.5 V
VCC = 5.5 V 24 24

3.15 3.15

1.35 1.35

CC
CC

–24 –24

24 24

0 V
0 V

CC
CC

V

V

V
V

mA

mA

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

SN54AC245, SN74AC245

PARAMETER

TEST CONDITIONS

V

UNIT

V

V

I

mA

V

V

I

24 mA

I

V

V

GND

5.5 V

A

PARAMETER

UNIT

A or B

B or A

ns

OE

A or B

ns

OE

A or B

ns

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)

CC

3 V 2.9 2.9 2.9

IOH = –50 mA

OH

OL

A or B ports

I

OE or DIR

I

OZ

I

CC

C

i

C

io

†

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 IOZ includes the input leakage current.

IOH = –12 mA 3 V 2.56 2.4 2.46

= –24

OH

CC

†
†

†
†

or

IH

IOH = –50 mA
IOH = –75 mA

IOL = 50 mA

IOL = 12 mA 3 V 0.36 0.5 0.44

=

OL

IOL = 50 mA
IOL = 75 mA

‡

=

I

VO = VCC or GND,
VI(OE) = VIL or V

VI = VCC or GND, IO = 0 5.5 V 4 80 40
VI = VCC or GND 5 V 4.5 pF
VO = VCC or GND 5 V 15 pF

4.5 V 4.4 4.4 4.4

5.5 V 5.4 5.4 5.4

4.5 V 3.86 3.7 3.76

5.5 V 4.86 4.7 4.76

5.5 V 3.85

5.5 V 3.85
3 V 0.002 0.1 0.1 0.1

4.5 V 0.001 0.1 0.1 0.1

5.5 V 0.001 0.1 0.1 0.1

4.5 V 0.36 0.5 0.44

5.5 V 0.36 0.5 0.44

5.5 V 1.65

5.5 V 1.65

5.5 V ±0.5 ±10 ±5

TA = 25°C SN54AC245 SN74AC245

MIN TYP MAX MIN MAX MIN MAX

±0.1 ±1 ±1
±0.1 ±1 ±1

m

m

A

m

A

switching characteristics over recommended operating free-air temperature range,
V

= 3.3 V " 0.3 V (unless otherwise noted) (see Figure 1)

CC

TA = 25°C SN54AC245 SN74AC245

MIN TYP MAX MIN MAX MIN MAX

1.5 5 8.5 1 11.5 1 9

1.5 5 8.5 1 10 1 9

2.5 7 11.5 1 13.5 2 12.5

2.5 7.5 12 1 14.5 2 13.5
2 6.5 12 1 13.5 1 12.5
2 7 11.5 1 14 1.5 13

4

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

FROM TO

(INPUT) (OUTPUT)

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER

UNIT

A or B

B or A

ns

OE

A or B

ns

OE

A or B

ns

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

TA = 25°C SN54AC245 SN74AC245

MIN TYP MAX MIN MAX MIN MAX

1.5 3.5 6.5 1 8.5 1 7

1.5 3.5 6 1 7.5 1 7

1.5 5 8.5 1 10 1 9

1.5 5.5 9 1 10.5 1 9.5

1.5 5.5 9 1 10.5 1 10

1.5 5.5 9 1 10.5 1 10

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

FROM TO

(INPUT) (OUTPUT)

operating characteristics, V

PARAMETER TEST CONDITIONS TYP UNIT

Cpd Power dissipation capacitance per transceiver CL = 50 pF, f = 1 MHz 45 pF

= 5 V, T

CC

= 25°C

A

PARAMETER MEASUREMENT INFORMATION

2 × V

From Output
Under Test

CL = 50 pF

(see Note A)

Input

In-Phase

Output

Out-of-Phase

Output

50% 50%

t

PLH

t

PHL

VOLTAGE WAVEFORMS

500 Ω

500 Ω

LOAD CIRCUIT

50% V

CC

50% V

CC

t

PHL

50% V

t

PLH

50% V

V

0 V

V

CC

V

V

CC

V

S1

CC

OH

OL

OH

OL

CC

Open

S1 at 2 × V

Output

Control

(low-level

enabling)

Output

Waveform 1

(see Note B)

Waveform 2

S1 at Open

(see Note B)

CC

Output

t

PZL

t

PZH

TEST S1

t

PLH/tPHL

t

PLZ/tPZL

t

PHZ/tPZH

50% V

t

PLZ

50% V

t

PHZ

50% V

VOLTAGE WAVEFORMS

CC

Open

2 × V

Open

50% V

CC

CC

CC

CC

VOL + 0.3 V

VOH – 0.3 V

V

0 V

[

V

V

[

CC

V

OL

OH

0 V

CC

NOTES: A. CL includes probe and jig capacitance.

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, ZO = 50 Ω, tr v2.5 ns, tf v 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.

Figure 1. Load Circuit and Voltage Waveforms

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5

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