Texas Instruments SN74BCT245DW, SN74BCT245DWR, SN74BCT245N, SN74BCT245DBLE, SN74BCT245DBR Datasheet

SN54BCT245, SN74BCT245

OPERATION

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994

• State-of-the-Art BiCMOS Design

Significantly Reduces I

CCZ

• ESD Protection Exceeds 2000 V

Per MIL-STD-883C, Method 3015

• 3-State Outputs Drive Bus Lines or Buffer

Memory Address Registers

• Package Options Include Plastic

Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(J, N)

description

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 upon the level at the direction-control
(DIR) input. The output-enable (OE
used to disable the device so the buses are
effectively isolated.

The SN74BCT245 is available in TI’s shrink
small-outline package (DB), which provides the
same I/O pin count and functionality of standard
small-outline packages in less than half the
printed-circuit-board area.

The SN54BCT245 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT245 is characterized for
operation from 0°C to 70°C.

) input can be

SN54BCT245 ...J OR W PACKAGE

SN74BCT245 . . . DB, DW, OR N P ACKAGE

SN54BCT245 . . . FK PACKAGE

A3
A4
A5
A6
A7

(TOP VIEW)

DIR

1

A1

2

A2

3

A3

4

A4

5

A5

6

A6

7

A7

8
9

A8

GND

10

(TOP VIEW)

A2A1DIR

3212019

4
5
6
7
8

910111213

A8

B8

20
19
18
17
16
15
14
13
12
11

V

B7

CC

V
OE
B1
B2
B3
B4
B5
B6
B7
B8

18
17
16
15
14

B6 OE

CC

B1
B2
B3
B4
B5

GND

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.

FUNCTION TABLE

INPUTS

OE DIR

L L B data to A bus
L H A data to B bus

H X Isolation

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1994, Texas Instruments Incorporated

2–1

SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994

19
1

2

3
4
5
6
7
8
9

†

G3
3EN1[BA]

3EN2[AB]

18

17
16
15
14
13
12
11

B1

B2
B3
B4
B5
B6
B7
B8

1

2

logic diagram (positive logic)

1

DIR

2

A1

To Seven Other Channels

19

18

OE

B1

logic symbol

OE

DIR

A1

A2
A3
A4
A5
A6
A7
A8

†

This 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)

Supply voltage range, V

CC

Input voltage range: Control inputs (see Note 1) – 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O ports (see Note 1) – 0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state, V
Voltage range applied to any output in the high state, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

O

Current into any output in the low state: SN54BCT245 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT245 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power dissipation (DB package only) (see Note 2) 650 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54BCT245 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT245 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range – 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 voltage ratings may be exceeded if the input and output current ratings are observed.

2. Power dissipation is application dependent and is a function of supply voltage, operating temperature, the number of outputs
switching simultaneously , and output duty cycle. Because the thermal resistance of the DB package is higher than that of the DW
or N packages, the DB package may not be suitable for some applications.

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

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

– 0.5 V to V

‡

CC

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54BCT245, SN74BCT245

UNIT

IOHHigh-level output current

mA

IOLLow-level output current

mA

PARAMETER

TEST CONDITIONS

UNIT

A port

V

V

A port

V

4.5 V

V

V

B port

V

V

I

V

V

V

mA

I

‡

V

5.5 V

V

2.7 V

A

I

‡

V

V

V

mA

I

§

V

V

0

mA

C

V

V

V

pF

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994

recommended operating conditions

SN54BCT245 SN74BCT245

MIN NOM MAX MIN NOM MAX

V

CC

V

IH

V

IL

I

IK

T

A

electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)

V

IK

V

OH

OL

I

IH

IL

OS

I

CCL

I

CCH

I

CCZ

C

i

io

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

For I/O ports, the parameters IIH and IIL include the off-state output current.

§

Not more than one output should be tested at a time, and the duration of the test should not exceed one second.

Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
Input clamp current –18 –18 mA

p

p

Operating free-air temperature –55 125 0 70 °C

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V

p

B port VCC = 4.5 V

p

p

A or B port
Control input
A or B port
Control input
A or B port
Control input
A port
B port
A to B VCC = 5.5 V 57 90 57 90 mA
A to B VCC = 5.5 V 36 57 36 57 mA

Control input VCC = 5 V, VI = 2.5 V or 0.5 V 7 7 pF
A to B
B to A

= 4.5

CC

=

CC

= 4.5

CC

= 5.5 V,

CC

,

=

CC

= 5.5 V,

CC

= 5.5 V,

CC

VCC = 5.5 V 10 15 10 15 mA

= 5 V,

CC

IOH = –1 mA 2.5 3.4 2.5 3.4
IOH = –3 mA 2.4 3.3 2.4 3.3
IOH = –3 mA 2.4 3.3 2.4 3.3
IOH = –12 mA 2 3.2
IOH = –15 mA 2 3.1
IOL = 20 mA 0.3 0.5
IOL = 24 mA 0.35 0.5
IOL = 48 mA 0.38 0.55
IOL = 64 mA 0.42 0.55

I

I

I

O

O

A port –3 –3
B port –12 –15
A port 20 24
B port 48 64

SN54BCT245 SN74BCT245

MIN TYP†MAX MIN TYP†MAX

= 5.5

=

= 0.5

=

= 2.5 V or 0.5

–60 –150 –60 –150

–100 –225 –100 –225

12 12

1 1

0.1 0.1
70 70
20 20

–0.65 –0.65

–1.2 –1.2

9 9

V

µ

p

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

2–3

SN54BCT245, SN74BCT245

A or B

B or A

ns

OE

A or B

ns

OE

A or B

ns

OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994

switching characteristics (see Note 3)

VCC = 5 V,
CL = 50 pF,

PARAMETER

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t
†
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.

PLZ

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

FROM

(INPUT)

TO

(OUTPUT)

R1 = 500 Ω,
R2 = 500 Ω,
TA = 25°C

′BCT245 SN54BCT245 SN74BCT245

MIN TYP MAX MIN MAX MIN MAX

1 4.4 6 1 7.2 1 7

1.5 4.8 6.6 1.5 7.6 1.5 7

1.5 8 9.4 1.5 11.2 1.5 10.9

1.5 8 10.2 1.5 11.8 1.5 11.6

1.5 5.8 8.3 1.5 9.7 1.5 9.3

1.5 5.1 7.8 1.5 9.6 1.5 9.1

VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX

†

UNIT

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54BCT245, SN74BCT245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994

TYPICAL CHARACTERISTICS

†

Figures 1 through 4 show the typical power dissipation for an SN74BCT245 over variations in outputs switching,
output frequency, and capacitive load.

POWER DISSIPATION

vs

FREQUENCY

1050

VCC = 5.5 V
TA = 70°C

900

RL = 500 Ω
Air Flow = 0

750

CL = 15 pF

600

450

300

D

P – Power Dissipation – mW

150

0

050

10 20 30 40

f – Frequency – MHz

Eight Switching

Four Switching

One Switching

POWER DISSIPATION

FREQUENCY

1400

1200

1000

D

P – Power Dissipation – mW

800

600

400

200

0

VCC = 5.5 V
TA = 70°C
RL = 500 Ω
Air Flow = 0
CL = 50 pF

0

10 20 30 40

f – Frequency – MHz

vs

Eight Switching

Four Switching

One Switching

50

Figure 1 Figure 2

POWER DISSIPATION

vs

1750

VCC = 5.5 V

1500

1250

1000

D

P – Power Dissipation – mW

TA = 70°C
RL = 500 Ω
Air Flow = 0
CL = 100 pF

750

500

250

0

050

FREQUENCY

Eight Switching

10 20 30 40

f – Frequency – MHz

Figure 3 Figure 4

†

The dashed lines are for the DB package only.

Four Switching

One Switching

POWER DISSIPATION

FREQUENCY

1750

1500

1250

1000

D

P – Power Dissipation – mW

VCC = 5.5 V
TA = 70°C
RL = 500 Ω
Air Flow = 0
CL = 150 pF

750

500

250

0

050

10 20 30 40

f – Frequency – MHz

vs

Eight Switching

Four Switching

One Switching

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

2–5

SN54BCT245, SN74BCT245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCBS013F – SEPTEMBER 1988 – REVISED APRIL 1994

2–6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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Copyright  1998, Texas Instruments Incorporated