TEXAS INSTRUMENTS SN74LVC245A Technical data

www.ti.com

FEATURES

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

V

CC

OE
B1
B2
B3
B4
B5
B6
B7
B8

DB, DGV, DW, N, NS, OR PW PACKAGE

(TOP VIEW)

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

• Operates From 1.65 V to 3.6 V

• Inputs Accept Voltages to 5.5 V

• Max tpdof 6.3 ns at 3.3 V

• Typical V

<0.8 V at V

• Typical V

>2 V at V

• I

Supports Partial-Power-Down Mode

off

Operation

• Supports Mixed-Mode Signal Operation on All

Ports (5-V Input/Output Voltage With

3.3-V V

• Latch-Up Performance Exceeds 250 mA Per

JESD 17

• ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)
– 1000-V Charged-Device Model (C101)

CC

OLP

CC

OHV

CC

)

(Output Ground Bounce)

= 3.3 V, T

(Output V

= 3.3 V, T

A

= 25 ° C

A
OH

= 25 ° C

Undershoot)

SN74LVC245A

OCTAL BUS TRANSCEIVER

WITH 3-STATE OUTPUTS

SCAS218T – JANUARY 1993 – REVISED FEBRUARY 2005

DESCRIPTION/ORDERING INFORMATION

This octal bus transceiver is designed for 1.65-V to

3.6-V V
The SN74LVC245A is designed for asynchronous

communication between data buses. The device
transmits 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 effectively are isolated.

–40 ° C to 85 ° C

(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.

operation.

CC

T

A

www.ti.com/sc/package.

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.

PDIP – N Tube of 20 SN74LVC245AN SN74LVC245AN
QFN – RGY Reel of 1000 SN74LVC245ARGYR LC245A

SOIC – DW LVC245A

SOP – NS Reel of 2000 SN74LVC245ANSR LVC245A
SSOP – DB Reel of 2000 SN74LVC245ADBR LC245A

TSSOP – PW Reel of 2000 SN74LVC245APWR LC245A

TVSOP – DGV Reel of 2000 SN74LVC245ADGVR LC245A
VFBGA – GQN SN74LVC245AGQNR
VFBGA – ZQN (Pb-Free) SN74LVC245AZQNR

ORDERING INFORMATION

PACKAGE

(1)

Tube of 25 SN74LVC245ADW
Reel of 2000 SN74LVC245ADWR

Tube of 70 SN74LVC245APW

Reel of 250 SN74LVC245APWT

Reel of 1000 LC245A

ORDERABLE PART NUMBER TOP-SIDE MARKING

Copyright © 1993–2005, Texas Instruments Incorporated

www.ti.com

GQN OR ZQN PACKAGE

(TOP VIEW)

1 2 3 4

A
B
C
D
E

DIR

OE

A1

B1

To Seven Other Channels

1

2

19

18

Pin numbers shown are for the DB, DGV , DW, N, NS, PW, and RGY packages.

SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS

SCAS218T – JANUARY 1993 – REVISED FEBRUARY 2005

DESCRIPTION/ORDERING INFORMATION (CONTINUED)

To ensure the high-impedance state during power up or power down, OE should be tied to V
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.

This device is fully specified for partial-power-down applications using I

. The I

off

circuitry disables the outputs,

off

preventing damaging current backflow through the device when it is powered down.

through a pullup

CC

TERMINAL ASSIGNMENTS

1 2 3 4

A A1 DIR V
B A3 B2 A2 B1
C A5 A4 B4 B3
D A7 B6 A6 B5
E GND A8 B8 B7

CC

FUNCTION TABLE

INPUTS

OE DIR

L L B data to A bus
L H A data to B bus
H X Isolation

OPERATION

LOGIC DIAGRAM (POSITIVE LOGIC)

OE

2

www.ti.com

SN74LVC245A

OCTAL BUS TRANSCEIVER

WITH 3-STATE OUTPUTS

SCAS218T – JANUARY 1993 – REVISED FEBRUARY 2005

Absolute Maximum Ratings

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

V

CC

V

I

V

O

V

O

I

IK

I

OK

I

O

θ

JA

T

stg

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

(2) The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
(3) The value of V
(4) The package thermal impedance is calculated in accordance with JESD 51-7.
(5) The package thermal impedance is calculated in accordance with JESD 51-5.

Supply voltage range –0.5 6.5 V
Input voltage range

(2)

Voltage range applied to any output in the high-impedance or power-off state
Voltage range applied to any output in the high or low state
Input clamp current VI< 0 –50 mA
Output clamp current VO< 0 –50 mA
Continuous output current ± 50 mA
Continuous current through V

Package thermal impedance ° C/W

Storage temperature range –65 150 ° C

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.

is provided in the recommended operating conditions table.

CC

(1)

MIN MAX UNIT

–0.5 6.5 V

(2)

(2) (3)

or GND ± 100 mA

CC

DB package
DGV package
DW package
GQN/ZQN package
N package
NS package
PW package
RGY package

(4)

(4)

(4)

(4)

(4)

(4)

(4)

(5)

–0.5 6.5 V
–0.5 V

CC

+ 0.5 V

70
92
58
78
69
60
83
37

3

www.ti.com

SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS

SCAS218T – JANUARY 1993 – REVISED FEBRUARY 2005

Recommended Operating Conditions

V

V

V

V
V

I

OH

I

OL

∆ t/ ∆ v Input transition rise or fall rate 10 10 ns/V

(1) All unused inputs of the device must be held at V

Supply voltage V

CC

High-level input voltage V

IH

Low-level input voltage V

IL

Input voltage 0 5.5 0 5.5 V

I

Output voltage 0 V

O

High-level output current mA

Low-level output current mA

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

(1)

TA= 25° C –40 ° C TO 85° C
MIN MAX MIN MAX

Operating 1.65 3.6 1.65 3.6
Data retention only 1.5 1.5
V

= 1.65 V to 1.95 V 0.65 × V

CC

= 2.3 V to 2.7 V 1.7 1.7 V

CC

V

= 2.7 V to 3.6 V 2 2

CC

V

= 1.65 V to 1.95 V 0.35 × V

CC

= 2.3 V to 2.7 V 0.7 0.7 V

CC

V

= 2.7 V to 3.6 V 0.8 0.8

CC

V

= 1.65 V –4 –4

CC

V

= 2.3 V –8 –8

CC

V

= 2.7 V –12 –12

CC

V

= 3 V –24 –24

CC

V

= 1.65 V 4 4

CC

V

= 2.3 V 8 8

CC

V

= 2.7 V 12 12

CC

V

= 3 V 24 24

CC

or GND to ensure proper device operation. Refer to the TI application report,

CC

CC

0.65 × V

CC

CC

CC

0.35 × V

0 V

UNIT

CC

V

CC

4

www.ti.com

Electrical Characteristics

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

PARAMETER TEST CONDITIONS V

IOH= –100 µ A 1.65 V to 3.6 V V
IOH= –4 mA 1.65 V 1.29 1.2

V

OH

IOH= –8 mA 2.3 V 1.9 1.7

IOH= –12 mA

IOH= –24 mA 3 V 2.3 2.2
IOL= 100 µ A 1.65 V to 3.6 V 0.1 0.2
IOL= 4 mA 1.65 V 0.24 0.45

V

OL

IOL= 8 mA 2.3 V 0.3 0.7 V
IOL= 12 mA 2.7 V 0.4 0.4
IOL= 24 mA 3 V 0.55 0.55

I

I

I

off

I

OZ

I

CC

∆ I
C

C

Control inputs VI= 0 to 5.5 V 3.6 V ± 1 ± 5 µ A

VIor VO= 5.5 V 0 ± 1 ± 10 µ A

(1)

CC

Control inputs VI= V

i

A or B ports VI= V

io

VO= 0 to 5.5 V 3.6 V ± 1 ± 10 µ A
VI= V

3.6 V ≤ VI≤ 5.5 V
One input at V

Other inputs at V

or GND 1 10

CC

or GND 3.3 V 4 pF

CC

or GND 3.3 V 5.5 pF

CC

(2)

– 0.6 V,

CC

CC

IO= 0 3.6 V µ A

or GND

(1) For I/O ports, the parameter IOZincludes the input leakage current.
(2) This applies in the disabled state only.

CC

2.7 V 2.2 2.2
3 V 2.4 2.4

2.7 V to 3.6 V 500 500 µ A

SN74LVC245A

OCTAL BUS TRANSCEIVER

WITH 3-STATE OUTPUTS

SCAS218T – JANUARY 1993 – REVISED FEBRUARY 2005

TA= 25 ° C –40 ° C TO 85 ° C

MIN TYP MAX MIN MAX

– 0.2 V

CC

1 10

– 0.2

CC

UNIT

V

Switching Characteristics

over recommended operating free-air temperature range (unless otherwise noted) (see Figure 1)

PARAMETER V

FROM TO

(INPUT) (OUTPUT)

1.8 V ± 0.15 V 1 6 12.2 1 12.7

t

pd

A or B B or A ns

2.5 V ± 0.2 V 1 3.9 7.8 1 8.3

3.3 V ± 0.3 V 1.5 3.8 6.1 1.5 6.3

1.8 V ± 0.15 V 1 7 14.8 1 15.3

t

en

OE A or B ns

2.5 V ± 0.2 V 1 4.5 10 1 10.5

3.3 V ± 0.3 V 1.5 4.4 8.3 1.5 8.5

1.8 V ± 0.15 V 1 7.8 16.5 1 17

t

dis

OE A or B ns

2.5 V ± 0.2 V 1 4 9 1 9.5

3.3 V ± 0.3 V 1.7 4.1 7.3 1.7 7.5

t

sk(o)

3.3 V ± 0.3 V 1 ns

CC

2.7 V 1 4.2 7.1 1 7.3

2.7 V 1 5.4 9.3 1 9.5

2.7 V 1 4.4 8.3 1 8.5

TA= 25 ° C –40 ° C TO 85 ° C

MIN TYP MAX MIN MAX

UNIT

5

www.ti.com

SN74LVC245A
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS

SCAS218T – JANUARY 1993 – REVISED FEBRUARY 2005

Operating Characteristics

TA= 25 ° C

PARAMETER V

C

Power dissipation capacitance per transceiver f = 10 MHz pF

pd

TEST

CONDITIONS

Outputs enabled 2.5 V 43

Outputs disabled 2.5 V 1

CC

1.8 V 42

3.3 V 45

1.8 V 1

3.3 V 2

TYP UNIT

6

www.ti.com

V

M

t

h

t

su

From Output

Under Test

C

L

(see Note A)

LOAD CIRCUIT

S1

V

LOAD

Open

GND

R

L

R

L

Data Input

Timing Input

V

I

0 V

V

I

0 V

0 V

t

w

Input

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

INVERTING AND NONINVERTING OUTPUTS

VOLTAGE WAVEFORMS

PULSE DURATION

t

PLH

t

PHL

t

PHL

t

PLH

V

OH

V

OH

V

OL

V

OL

V

I

0 V

Input

Output
Waveform 1
S1 at V

LOAD

(see Note B)

Output
Waveform 2

S1 at GND

(see Note B)

V

OL

V

OH

t

PZL

t

PZH

t

PLZ

t

PHZ

V

LOAD

/2

0 V

VOL + V

∆

VOH - V

∆

≈0 V

V

I

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

LOW- AND HIGH-LEVEL ENABLING

Output

Output

t

PLH/tPHL

t

PLZ/tPZL

t

PHZ/tPZH

Open

V

LOAD

GND

TEST S1

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.

Waveform2 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 ≤ 10 MHz, ZO = 50 Ω.
D. The outputs are measured one at a time, with one transition per measurement.
E. t

PLZ

and t

PHZ

are the same as t

dis

.

F. t

PZL

and t

PZH

are the same as ten.

G. t

PLH

and t

PHL

are the same as tpd.

H. All parameters and waveforms are not applicable to all devices.

Output

Control

V

M

V

M

V

M

V

M

V

M

V

M

V

M

V

M

V

M

V

M

V

M

V

M

V

I

V

M

V

M

1.8 V ± 0.15 V

2.5 V ± 0.2 V

2.7 V

3.3 V ± 0.3 V

1 kΩ
500 Ω
500 Ω
500 Ω

V

CC

R

L

2 × V

CC

2 × V

CC

6 V
6 V

V

LOAD

C

L

30 pF
30 pF
50 pF
50 pF

0.15 V

0.15 V

0.3 V

0.3 V

V

∆

V

CC

V

CC

2.7 V

2.7 V

V

I

VCC/2
VCC/2

1.5 V

1.5 V

V

M

tr/t

f

≤2 ns

≤2 ns
≤2.5 ns
≤2.5 ns

INPUTS

SN74LVC245A

OCTAL BUS TRANSCEIVER

WITH 3-STATE OUTPUTS

SCAS218T – JANUARY 1993 – REVISED FEBRUARY 2005

PARAMETER MEASUREMENT INFORMATION

Figure 1. Load Circuit and Voltage Waveforms

7