Texas Instruments SN54HC245J, SN74HC245PWLE, SN74HC245PWR, SN74HC245DBLE, SN74HC245DBR Datasheet

OPERATION

SN54HC245, SN74HC245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCLS131B – DECEMBER 1982 – REVISED MA Y 1997

D

High-Current 3-State Outputs Drive Bus
Lines Directly or up to 15 LSTTL Loads

D

Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW), and
Ceramic Flat (W) 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 on the logic level at the
direction-control (DIR) input. The output-enable
(OE

) input can be used to disable the device so

that the buses are effectively isolated.
The SN54HC245 is characterized for operation

over the full military temperature range of –55°C
to 125°C. The SN74HC245 is characterized for
operation from –40°C to 85°C.

SN54HC245 ...J OR W PACKAGE

SN74HC245 . . . DB, DW, N, OR PW PACKAGE

SN54HC245 . . . FK PACKAGE

A3
A4
A5
A6
A7

(TOP VIEW)

1

DIR

2

A1

3

A2

4

A3

5

A4

6

A5

7

A6

8

A7

9

A8

GND

10

(TOP VIEW)

A2A1DIR

3212019

4
5
6
7
8

910111213

20
19
18
17
16
15
14
13
12
11

CC

V

V
OE
B1
B2
B3
B4
B5
B6
B7
B8

OE

18
17
16
15
14

CC

B1
B2
B3
B4
B5

B7

B8

B6

A8

GND

FUNCTION TABLE

INPUTS

OE DIR

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

H X Isolation

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.

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  1997, Texas Instruments Incorporated

1

SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCLS131B – DECEMBER 1982 – REVISED MA Y 1997

logic symbol

†

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

†

OE

DIR

A1

A2
A3
A4
A5
A6
A7
A8

19
1

2

3
4
5
6
7
8
9

G3
3 EN1 [BA]

3 EN2 [AB]

1

2

logic diagram (positive logic)

1

DIR

18

17
16
15
14
13
12
11

B1

B2
B3
B4
B5
B6
B7
B8

A1

19

OE

2

18

B1

To Seven Other Channels

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

UNIT

SN54HC245, SN74HC245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCLS131B – DECEMBER 1982 – REVISED MA Y 1997

absolute maximum ratings over operating free-air temperature range

Supply voltage range, V

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

CC

†

Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous output current, IO (VO = 0 to VCC) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous current through VCC or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θ

(see Note 2): DB package 115°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

JA

DW package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PW package 128°C/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 package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.

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

stg

recommended operating conditions

SN54HC245 SN74HC245

MIN NOM MAX MIN NOM MAX

V

V

V

V
V

t

t

T

Supply voltage 2 5 6 2 5 6 V

CC

VCC = 2 V 1.5 1.5

High-level input voltage

IH

Low-level input voltage

IL

Input voltage 0 V

I

Output voltage 0 V

O

Input transition (rise and fall) time

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

A

VCC = 4.5 V
VCC = 6 V 4.2 4.2
VCC = 2 V 0 0.5 0 0.5
VCC = 4.5 V
VCC = 6 V 0 1.8 0 1.8

VCC = 2 V 0 1000 0 1000
VCC = 4.5 V
VCC = 6 V 0 400 0 400

3.15 3.15

0 1.35 0 1.35

CC
CC

0 500 0 500

0 V
0 V

CC
CC

V

V

V
V

ns

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3

SN54HC245, SN74HC245

PARAMETER

TEST CONDITIONS

V

UNIT

PARAMETER

V

UNIT

OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCLS131B – DECEMBER 1982 – REVISED MA Y 1997

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

CC

2 V 1.9 1.998 1.9 1.9

IOH = –20 µA

V

OH

V

OL

I

DIR or OE VI = VCC or 0 6 V ±0.1 ±100 ±1000 ±1000 nA

I

I

A or B VO = VCC or 0 6 V ±0.01 ±0.5 ±10 ±5 µA

OZ

I

CC

C

DIR or OE 2 V to 6 V 3 10 10 10 pF

i

VI = VIH or V

VI = VIH or V

VI = VCC or 0, IO = 0 6 V 8 160 80 µA

IL

IOH = –6 mA 4.5 V 3.98 4.3 3.7 3.84
IOH = –7.8 mA 6 V 5.48 5.8 5.2 5.34

IOL = 20 µA

IL

IOL = 6 mA 4.5 V 0.17 0.26 0.4 0.33
IOL = 7.8 mA 6 V 0.15 0.26 0.4 0.33

4.5 V 4.4 4.499 4.4 4.4
6 V 5.9 5.999 5.9 5.9

2 V 0.002 0.1 0.1 0.1

4.5 V 0.001 0.1 0.1 0.1
6 V 0.001 0.1 0.1 0.1

TA = 25°C SN54HC245 SN74HC245

MIN TYP MAX MIN MAX MIN MAX

V

V

switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)

FROM TO

(INPUT) (OUTPUT)

t

pd

t

en

t

dis

t

t

A or B B or A

OE A or B

OE A or B

A or B

CC

2 V 40 105 160 130

4.5 V 15 21 32 26
6 V 12 18 27 22
2 V 125 230 340 290

4.5 V 23 46 68 58
6 V 20 39 58 49
2 V 74 200 300 250

4.5 V 25 40 60 50
6 V 21 34 51 43
2 V 20 60 90 75

4.5 V 8 12 18 15
6 V 6 10 15 13

TA = 25°C SN54HC245 SN74HC245

MIN TYP MAX MIN MAX MIN MAX

ns

ns

ns

ns

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER

V

UNIT

SN54HC245, SN74HC245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCLS131B – DECEMBER 1982 – REVISED MA Y 1997

switching characteristics over recommended operating free-air temperature range, CL = 150 pF
(unless otherwise noted) (see Figure 1)

FROM TO

(INPUT) (OUTPUT)

t

pd

t

en

t

t

A or B B or A

OE A or B

A or B

operating characteristics, TA = 25°C

PARAMETER TEST CONDITIONS TYP UNIT

C

Power dissipation capacitance per transceiver No load 40 pF

pd

CC

2 V 54 135 200 170

4.5 V 18 27 40 34
6 V 15 23 34 29
2 V 150 270 405 335

4.5 V 31 54 81 67
6 V 25 46 69 56
2 V 45 210 315 265

4.5 V 17 42 63 53
6 V 13 36 53 45

TA = 25°C SN54HC245 SN74HC245

MIN TYP MAX MIN MAX MIN MAX

ns

ns

ns

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5

SN54HC245, SN74HC245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS

SCLS131B – DECEMBER 1982 – REVISED MA Y 1997

PARAMETER MEASUREMENT INFORMATION

50%

t

PHL

t

PLH

S1

S2

50%50%

10%10%

Test

From Output

Under Test

(see Note A)

Input

In-Phase

Output

Out-of-Phase

Output

PROPAGATION DELAY AND OUTPUT TRANSITION TIMES

Input

50%

INPUT RISE AND FALL TIMES

Point

C

L

LOAD CIRCUIT

t

PLH

t

PHL

VOLTAGE WAVEFORMS

90% 90%

t

r

VOLTAGE WAVEFORM

R

L

90% 90%

t

r

50% 50%

10% 10%

t

f

V

CC

t

f

V

0 V

50%50%

CC

PARAMETER C

t

Output

Control

Output

Output

t

t

t

PZH

t

PZL

t

PHZ

t

PLZ

PZL

PZH

t

en

t

dis

tpd or t

V

CC

0 V

V

OH

10%10%

V

OL

t

f

V

90%90%

V

t

r

(Low-Level

OH

OL

Enabling)

Waveform 1

(See Note B)

Waveform 2

(See Note B)

ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS

R

L

1 kΩ

1 kΩ

50%

VOLTAGE WAVEFORMS

L

50 pF

or

150 pF

50 pF

50 pF

or

150 pF

≈ V

50%

50%

CC

S1

Open Closed

Closed Open

Open Closed

Closed Open

Open Open––

50%

t

PLZ

10%

90%

t

PHZ

S2

V

CC

0 V

≈ V

V

OL

V

OH

≈ 0 V

CC

NOTES: A. CL includes probe and test-fixture 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. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following

characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
D. The outputs are measured one at a time with one input transition per measurement.
E. t
F. t

G. t

PLZ
PZL
PLH

and t
and t
and t

are the same as t

PHZ

are the same as ten.

PZH

are the same as tpd.

PHL

dis

.

Figure 1. Load Circuit and Voltage Waveforms

6

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