SGS Thomson Microelectronics 74LCX245MTR, 74LCX245M, 74LCX245TTR Datasheet

1/10September 2001

■ 5V TOLERANT INPUTS AND OUTPUTS

■ HIGH SPEED :

t

PD

= 7.0 ns (MAX.) at VCC = 3V

■ POWER DOWN PROTECTION ON INPUT S

AND OUTPUTS

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

| = IOL = 24mA (MIN) at VCC = 3V

■ PCI BUS LEVELS GUARANT EED AT 2 4 mA

■ BALANCED PROPAGATION DELAYS:

t

PLH

≅ t

PHL

■ OPERATING VOLTAGE RANGE:

V

CC

(OPR) = 2.0V to 3.6V (1.5V Data

Retention)

■ PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 245

■ LATCH-UP PERFORMANCE EXCEEDS

500mA (JESD 17)

■ ESD PERFORMANCE:

HBM > 2000V (MIL STD 883 method 3015);
MM > 200V

DESCRIPTION

The 74LCX245 is a low voltage CMOS OCTAL
BUS TRANSCEIVER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C

2

MOS technology. It is ideal for low power
and high speed 3.3V applications; it can be
interfaced to 5V signal environment for both inputs
and ou tputs.

It has same speed performance at 3. 3V than 5V
AC/ACT family, combined with a lower power
consumption.
This IC is intended for two way asynchronous
communication between data buses; the direction
of data transmission is determined by DIR input.
The enable input G

can be used to disable the
device so that the buses are effectively isolated.
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.

74LCX245

LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER(3-STATE)

WITH 5V TOLER AT IN PU TS AN D OU TPUTS

PIN CONNECTION AND IEC LOGIC SYMBOLS

ORDER CODES

PACKAGE TUBE T & R

SOP 74LCX245M 74LCX245MTR

TSSOP 74LCX245TTR

TSSOPSOP

74LCX245

2/10

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X : Don’t Care
Z : High Impedance

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

74LCX245

3/10

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

1) I

O

absolute ma xim um rating mu st be observed

2) V

O

< GND

RECOMMENDED OPERATING CONDITIONS

1) Truth T abl e guaranteed: 1.5V to 3.6V

2) V

IN

from 0.8V to 2V at VCC = 3.0V

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 (OFF State)

-0.5 to +7.0 V

V

O

DC Output Voltage (High or Low State) (note 1) -0.5 to VCC + 0.5

V

I

IK

DC Input Diode Current

- 50 mA

I

OK

DC Output Diode Current (note 2)

- 50 mA

I

O

DC Output Current

± 50 mA

I

CC

DC Supply Current per Supply Pin

± 100 mA

I

GND

DC Ground Current per Supply Pin

± 100 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)

2.0 to 3.6 V

V

I

Input Voltage

0 to 5.5 V

V

O

Output Voltage (OFF State)

0 to 5.5 V

V

O

Output Voltage (High or Low State) 0 to V

CC

V

I

OH

, I

OL

High or Low Level Output Current (VCC = 3.0 to 3.6V)

± 24 mA

I

OH

, I

OL

High or Low Level Output Current (VCC = 2.7V)

± 12 mA

T

op

Operating Temperature

-55 to 125 °C

dt/dv Input Rise and Fall Time (note 2) 0 to 10 ns/V