Datasheet 74LVX245M, 74LVX245TTR Datasheet (SGS Thomson Microelectronics)

1/9July 2001

■ HIGH SPEED:

t

PD

=4.7ns (TYP.) at VCC = 3.3V

■ 5V TOLERANT INPUTS

■ POWER-DOWN PROTECTION ON INPUTS

■ INPUT VOLTAGE LEVEL:

V

IL

= 0.8V, VIH = 2V at VCC =3V

■ LOW POWER DISSIPATION:

I

CC

= 4 µA (MAX.) at TA=25°C

■ LOW NOISE:

V

OLP

= 0.5V (TYP.) at VCC =3.3V

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

| = IOL = 4 mA (MIN) at VCC =3V

■ BALANCED PROPAGATION DELAYS:

t

PLH

≅ t

PHL

■ OPERATING VOLTAGE RAN GE:

V

CC

(OPR) = 2V to 3.6V (1.2V Data Retention)

■ PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 245

■ IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The 74LVX245 is a low voltage CMOS OCTAL
BUS BUFFER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C

2

MOS technology. It is ideal for low
power, battery operated and low noise 3.3V
applications.
This IC is intended for two-way asynchronous
communication between data busses; the
direction of data transmission is determined by

DIR input. The enable input G

can be used to
disable the device so that the busses are
effe ctively isolated .
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage.
This device can be used to interface 5V to 3V. It
combines high speed performance with the true
CMOS low power consumption.
All inputs and outputs are equipped with
protection circuits against stat ic discharge, giving
them 2KV ESD immunity and transient excess
voltage.
All floating bus terminals during High Z state must
be held HIGH or LOW.

74LVX245

LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER

(3-STATE) WITH 5V TOLERANT INPUTS

PIN CONNECTION AND IEC LOGIC SYMBOLS

ORDER CODES

PACKAGE TUBE T & R

SOP 74LVX245M 74LVX245MTR

TSSOP 74LVX245TTR

TSSOPSOP

74LVX245

2/9

INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

TRUTH TABLE

X :Don‘t Care
Z : High Impedance

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied

RECOMMENDED OPERATING CONDITIONS

1) Truth T abl e guaranteed: 1.2V to 3.6V

2) V

IN

from 0.8V to 2.0V

PIN No SYMBOL NAME AND FUNCTION

1 DIR Directional Control

2, 3, 4, 5, 6,

7, 8, 9

A1 to A8 Data Inputs/Outputs

18, 17, 16,
15, 14, 13,

12, 11

B1 to B8 Data Inputs/Outputs

19 G

Output Enable Input
10 GND Ground (0V)
20 V

CC

Positive Supply Voltage

INPUTS FUNCTION

OUTPUT

G

DIR A BUS B BUS

L L OUTPUT INPUT A = B
L H INPUT OUTPUT B = A

HXZZZ

Symbol Parameter Value Unit

V

CC

Supply Voltage

-0.5 to +7.0 V

V

I

DC Input Voltage

-0.5 to +7.0 V

V

O

DC Output Voltage -0.5 to VCC + 0.5

V

I

IK

DC Input Diode Current

- 20 mA

I

OK

DC Output Diode Current

± 20 mA

I

O

DC Output Current

± 25 mA

I

CC

or I

GND

DC VCC or Ground Current

± 50 mA

T

stg

Storage Temperature

-65 to +150 °C

T

L

Lead Temperature (10 sec)

300 °C

Symbol Parameter Value Unit

V

CC

Supply Voltage (note 1)

2 to 3.6 V

V

I

Input Voltage

0 to 5.5 V

V

O

Output Voltage 0 to V

CC

V

T

op

Operating Temperature

-55 to 125 °C

dt/dv

Input Rise and Fall Time (note 2) (V

CC

= 3V)

0 to 100 ns/V

74LVX245

3/9

DC SPECIFICATIONS

DYNAMIC SWITCHING CHARACTERISTICS

1) Worst c ase package.

2) Max number of output s defined as (n). Dat a i nputs are driven 0V to 3.3V, (n -1) outputs switc hi ng and one out put at GND.

3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (V

ILD

), 0V to threshold

(V

IHD

), f=1MHz.

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

T

A

= 25°C

-40 to 85°C -55 to 125°C

Min. Typ. Max. Min. Max. Min. Max.

V

IH

High Level Input
Voltage

2.0 1.5 1.5 1.5
V3.0

2.0 2.0 2.0

3.6

2.4 2.4 2.4

V

IL

Low Level Input
Voltage

2.0 0.5 0.5 0.5
V3.0 0.8 0.8 0.8

3.6 0.8 0.8 0.8

V

OH

High Level Output
Voltage

2.0

IO=-50 µA

1.9 2.0 1.9 1.9
V3.0

I

O

=-50 µA

2.9 3.0 2.9 2.9

3.0

I

O

=-4 mA

2.58 2.48 2.4

V

OL

Low Level Output
Voltage

2.0

I

O

=50 µA

0.0 0.1 0.1 0.1
V3.0

I

O

=50 µA

0.0 0.1 0.1 0.1

3.0

I

O

=4 mA

0.36 0.44 0.55

I

OZ

High Impedance
Output Leakage
Current

3.6

V

I

= VIH or V

IL

VO = VCC or GND

±0.25 ± 2.5 ± 5 µA

I

I

Input Leakage
Current

3.6

V

I

= 5V or GND

± 0.1 ± 1 ± 1 µA

I

CC

Quiescent Supply
Current

3.6

V

I

= VCC or GND

44040µA

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

T

A

= 25°C

-40 to 85°C -55 to 125°C

Min. Typ. Max. Min. Max. Min. Max.

V

OLP

Dynamic Low
Voltage Quiet
Output (note 1, 2)

3.3

C

L

= 50 pF

0.5 0.8

V

V

OLV

-0.8 -0.5

V

IHD

Dynamic High
Voltage Input
(note 1, 3)

3.3 2.0

V

ILD

Dynamic Low
Voltage Input
(note 1, 3)

3.3 0.8

74LVX245

4/9

AC ELECTRICAL CHARACTERISTICS (Input tr = tf = 3ns)

1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch­ing in the same directio n, either HIGH or LO W

2) Param eter guarante ed by design
(*) Vol tage range is 3.3V ±

0.3V

CAPACITIVE CHARACTERISTICS

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I

CC(opr)

= CPD x VCC x fIN + ICC/8 (per c ircuit )

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

C

L

(pF)

T

A

= 25°C

-40 to 85°C -55 to 125°C

Min. Typ. Max. Min. Max. Min. Max.

t

PLH

t

PHL

Propagation Delay
Time

2.7

15 6.1 11.4 1.0 13.5 1.0 15.0

ns

2.7

50 8.6 14.9 1.0 17.0 1.0 18.0

3.3

(*)

15 4.5 7.1 1.0 8.5 1.0 9.5

3.3

(*)

50 7.2 10.6 1.0 12.0 1.0 13.0

t

PZL

t

PZH

Output Enable
Time

2.7 15 7.1 13.8 1.0 16.5 1.0 17.5
ns

2.7 50 9.6 17.3 1.0 20.0 1.0 21.0

3.3

(*)

15 5.5 8.8 1.0 10.5 1.0 12.

3.3

(*)

50 8.0 12.3 1.0 14.0 1.0 15.0

t

PLZ

t

PHZ

Output Disable
Time

2.7 50 11.6 16.0 1.0 19.0 1.0 20.5
ns

3.3

(*)

50 9.7 11.4 1.0 13.0 1.0 14.5

t

OSLH

t

OSHL

Output to Output
Skew Time (note
1,2)

2.7 50 0.5 1.0 1.5 1.5
ns

3.3

(*)

50 0.5 1.0 1.5 1.5

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

T

A

= 25°C

-40 to 85°C -55 to 125°C

Min. Typ. Max. Min. Max. Min. Max.

C

IN

Input Capacitance

3.3 5 10 10 pF

C

i/o

Input/Output
Capacitance

3.3 10 15 15 pF

C

PD

Power Dissipation
Capacitance
(note 1)

3.3

f

IN

= 10MHz

32 pF

74LVX245

5/9

TEST CIRCUIT

CL =15/50pF or equivalent (includes jig and probe capacitance)
R

L

= R1 = 1KΩ or equivalent

R

T

= Z

OUT

of pulse generator (typically 50Ω)

WAVEFORM 1 : PROPAGATION DELAYS (f=1MHz; 50% duty cycle)

TEST SWITCH

t

PLH

, t

PHL

Open

t

PZL

, t

PLZ

V

CC

t

PZH

, t

PHZ

GND

74LVX245

6/9

WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)

74LVX245

7/9

DIM.

mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 2.65 0.104
a1 0.1 0.2 0.004 0.008
a2 2.45 0.096

b 0.35 0.49 0.014 0.019
b1 0.23 0.32 0.009 0.012

C 0.5 0.020

c1 45° (typ.)

D 12.60 13.00 0.496 0.512
E 10.00 10.65 0.393 0.419

e 1.27 0.050
e3 11.43 0.450

F 7.40 7.60 0.291 0.300

L 0.50 1.27 0.020 0.050

M 0.75 0.029
S8° (max.)

SO-20 MECHANICAL DATA

PO13L

74LVX245

8/9

DIM.

mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 1.2 0.047

A1 0.05 0.15 0.002 0.004 0.006

A2 0.8 1 1.05 0.031 0.039 0.041

b 0.19 0.30 0.007 0.012

c 0.09 0.20 0.004 0.0089

D 6.4 6.5 6.6 0.252 0.256 0.260

E 6.2 6.4 6.6 0.244 0.252 0.260

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K0° 8°0° 8°

L 0.45 0.60 0.75 0.018 0.024 0.030

TSSOP20 MECHANICAL DATA

c

E

b

A2

A

E1

D

1

PIN 1 IDENTIFICATION

A1

L

K

e

0087225C

74LVX541

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