SGS Thomson Microelectronics 74LVX245M, 74LVX245TTR Datasheet

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