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

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

74LCX245

4/10

DC SPECIFICATIONS

DYNAMIC SWITCHING CHARACTERISTICS

1) Number of outputs d ef i ned as "n". Me asured with "n-1" output s switching from HIGH to LO W or LOW to HIGH. The remaini ng outpu t is
measur ed i n the LOW state.

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

-40 to 85 °C -55 to 125 °C

Min. Max. Min. Max.

V

IH

High Level Input
Voltage

2.7 to 3.6

2.0 2.0 V

V

IL

Low Level Input
Voltage

0.8 0.8 V

V

OH

High Level Output
Voltage

2.7 to 3.6

I

O

=-100 µAVCC-0.2 VCC-0.2

V

2.7

I

O

=-12 mA

2.2 2.2

3.0

I

O

=-18 mA

2.4 2.4

I

O

=-24 mA

2.2 2.2

V

OL

Low Level Output
Voltage

2.7 to 3.6

I

O

=100 µA

0.2 0.2

V

2.7

I

O

=12 mA

0.4 0.4

3.0

I

O

=16 mA

0.4 0.4

I

O

=24 mA

0.55 0.55

I

I

Input Leakage
Current

2.7 to 3.6

V

I

= 0 to 5.5V

± 5 ± 5 µA

I

off

Power Off Leakage
Current

0

V

I

or VO = 5.5V

10 10 µA

I

OZ

High Impedance
Output Leakage
Current

2.7 to 3.6

V

I

= VIH or V

IL

VO = 0 to V

CC

± 5 ± 5 µA

I

CC

Quiescent Supply
Current

2.7 to 3.6

VI = VCC or GND

10 10

µA

V

I

or VO= 3.6 to 5.5V

± 10 ± 10

∆I

CC

ICC incr. per Input

2.7 to 3.6

VIH = VCC - 0.6V

500 500 µA

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

T

A

= 25 °C

Min. Typ. Max.

V

OLP

Dynamic Low Level Quiet
Output (note 1)

3.3

C

L

= 50pF

V

IL

= 0V, VIH = 3.3V

0.8
V

V

OLV

-0.8

74LCX245

5/10

AC ELECTRICAL CHARACTERISTICS

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 direction, either HIGH or LOW (t

OSLH

= | t

PLHm

- t

PLHn

|, t

OSHL

= | t

PHLm

- t

PHLn

|)

2) Param eter guaran te ed by design

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)

R

L

(Ω)

t

s

= t

r

(ns)

-40 to 85 °C -55 to 125 °C

Min. Max. Min. Max.

t

PLH tPHL

Propagation Delay
Time

2.7
50 500 2.5

1.5 8. 0 1.5 9.2
ns

3.0 to 3.6 1.5 7.0 1.5 8.1

t

PZL tPZH

Output Enable Time 2.7

50 500 2.5

1.5 9. 5 1.5 10.7
ns

3.0 to 3.6 1.5 8.5 1.5 9.7

t

PLZ tPHZ

Output Disable Time 2.7

50 500 2.5

1.5 8.5 1.5 9.7
ns

3.0 to 3.6 1.5 7.5 1.5 8.7

t

OSLH

t

OSHL

Output To Output
Skew Time (note1,

2)

3.0 to 3.6 50 500 2.5 1.0 1.0 ns

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

T

A

= 25 °C

Min. Typ. Max.

C

IN

Input Capacitance

3.3

VIN = 0 to V

CC

6pF

C

OUT

Output Capacitance

3.3

VIN = 0 to V

CC

12 pF

C

PD

Power Dissipation Capacitance
(note 1)

3.3 fIN = 10MHz
V

IN

= 0 or V

CC

45

pF

74LCX245

6/10

TEST CIRCUIT

CL = 50 pF or equival ent (includes jig and probe capacitance)
R

L

= R1 = 500Ω or equivalent

R

T

= Z

OUT

of pulse generator (typically 50Ω)

WAVEFORM 1 : PROPAGATION DELAYS (f=1MH z; 5 0% duty cycle )

TEST SWITCH

t

PLH

, t

PHL

Open

t

PZL

, t

PLZ

6V

t

PZH

, t

PHZ

GND

74LCX245

7/10

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

74LCX245

8/10

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

74LCX245

9/10

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

74LCX245

10/10

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