ST 74LVC245A User Manual

1/12July 2004

■ 5V TOLERANT INPUTS

■ HIGH SPEED: t

PD

= 6.3ns (MAX.) at V

CC

= 3V

■ POWER DOWN PROTECTION ON INPUTS

AND OUTPUTS

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

| = I

OL

= 24mA (MIN) at V

CC

= 3V

■ PCI BUS LEVELS GUARANTEED AT 24 mA

■ BALANCED PROPAGATION DELAYS:

t

PLH

≅ t

PHL

■ OPERATING VOLTAGE RANGE:

V

CC

(OPR) = 1.65V to 3.6V (1.2V Data

Retention)

■ PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 245

■ LA TCH-UP PERFORMANCE EXCEEDS

500mA (JESD 17)

■ ESD PERFORMANCE:

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

MM > 200V

DESCRIPTION

The 74LVC245A is a lo w 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 1.65 to 3.6

V

CC

operations and low power and low noise

applications.

This IC is intended for two-way asynchronous

communication between data buses and 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.

It has more sp eed performance at 3.3V than 5V

AC/ACT family, combined with a lower power

consumption.

All inputs are equipped with protection circuits

against static discharge, giving them 2KV ESD

immunity and transient excess voltage.

All floating bus terminals during High Z State must

be held HIGH or LOW.

74LVC245A

LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER

(NOT INVERTED) HIGH PERFORMANCE

.

Figure 1: Pin C onnection And I EC Logic Symbol s

Table 1: Order Codes

PACKAGE T & R

SOP 74LVC245AMTR

TSSOP 74LVC245ATTR

TSSOPSOP

Rev. 4

74LVC245A

2/12

Figure 2: Input An d Output Equival e n t Ci rcui t

Table 2: Pin Description Table 3: Truth Table

X : Don’t Care

Z : High Impedance

Table 4: 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 maximum rating must be observed

2) V

O

< GND

PIN N° 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 Yn

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 (High Impedance or V

CC

= 0V)

-0.5 to +7.0 V

V

O

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

CC

+ 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

or I

GND

DC V

CC

or Ground Current per Supply Pin

± 100 mA

T

stg

Storage Temperature

-65 to +150 °C

T

L

Lead Temperature (10 sec)

300 °C

74LVC245A

3/12

Table 5: Recommended Operating Conditions

1) Truth T abl e guarante ed: 1.2V to 3.6V

2) V

IN

from 0.8V to 2V at V

CC

= 3.0V

Table 6: DC Specifications

Symbol Parameter Value Unit

V

CC

Supply Voltage (note 1)

1.65 to 3.6 V

V

I

Input Voltage

0 to 5.5 V

V

O

Output Voltage (High Impedance or V

CC

= 0V)

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 (V

CC

= 3.0 to 3.6V)

± 24 mA

I

OH

, I

OL

High or Low Level Output Current (V

CC

= 2.7 to 3.0V)

± 12 mA

I

OH

, I

OL

High or Low Level Output Current (V

CC

= 2.3 to 2.7V)

± 8mA

I

OH

, I

OL

High or Low Level Output Current (V

CC

= 1.65 to 2.3V)

± 4mA

T

op

Operating Temperature

-55 to 125 °C

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

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

1.65 to 1.95

0.65V

CC

0.65V

CC

V

2.3 to 2.7 1.7 1.7

2.7 to 3.6 2 2

V

IL

Low Level Input

Voltage

1.65 to 1.95

0.35V

CC

0.35V

CC

V

2.3 to 2.7 0.7 0.7

2.7 to 3.6 0.8 0.8

V

OH

High Level Output

Voltage

1.65 to 3.6

I

O

=-100 µAV

CC

-0.2 V

CC

-0.2

V

1.65

I

O

=-4 mA

1.2 1.2

2.3

I

O

=-8 mA

1.7 1.7

2.7

I

O

=-12 mA

2.2 2.2

3.0

I

O

=-18 mA

2.4 2.4

3.0

I

O

=-24 mA

2.2 2.2

V

OL

Low Level Output

Voltage

1.65 to 3.6

I

O

=100 µA

0.2 0.2

V

1.65

I

O

=4 mA

0.45 0.45

2.3

I

O

=8 mA

0.7 0.7

2.7

I

O

=12 mA

0.4 0.4

3.0

I

O

=24 mA

0.55 0.55

I

I

Input Leakage Current

3.6

V

I

= 0 to 5.5V

± 5 ± 5 µA

I

off

Power Off Leakage

Current

0

V

I

or V

O

= 5.5V

10 10 µA

I

OZ

High Impedance

Output Leakage

Current

3.6 V

I

= V

IH

orV

IL

V

O

= 0 to 5.5V

± 10 ± 10 µA

I

CC

Quiescent Supply

Current

3.6

V

I

= V

CC

or GND

10 10

µA

V

I

or V

O

= 3.6 to

5.5V

± 10 ± 10

∆I

CC

I

CC

incr. per Input

2.7 to 3.6

V

IH

= V

CC

-0.6V

500 500 µA

74LVC245A

4/12

Table 7: Dynamic Switching Characteristics

1) Number of output de fined as "n". M easured with "n -1" outputs switching fr om HI GH to LOW or LOW to HIGH. The rem ai ning output is

measur ed i n the LOW state.

Table 8: 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 switch-

ing in the sa me directio n, either HIGH or LOW (t

OSLH

= | t

PLHm

- t

PLHn

|, t

OSHL

= | t

PHLm

- t

PHLn

|

2) Param eter guaran teed by design

Table 9: Capacitive Characteristics

1) C

PD

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)

= C

PD

x V

CC

x f

IN

+ I

CC

/n (per c ircuit )

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, V

IH

= 3.3V

0.8

V

V

OLV

-0.8

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

t

PHL

Propagation Delay

Time

1.65 to 1.95 30 1000 2.0 2.0 9.0 2.0 12

ns

2.3 to 2.7 30 500 2.0 2.0 8.0 2.0 10.5

2.7 50 500 2.5 1.5 7.3 1.5 8.8

3.0 to 3.6 50 500 2.5 1.0 6.3 1.0 7.6

t

PZL

t

PZH

Output Enable Time 1.65 to 1.95 30 1000 2.0 2.0 12 2.0 16

ns

2.3 to 2.7 30 500 2.0 2.0 9.5 2.0 12.5

2.7 50 500 2.5 1.0 9.0 1.0 11

3.0 to 3.6 50 500 2.5 1.0 8.5 1.0 10

t

PLZ

t

PHZ

Output Disable Time 1.65 to 1.95 30 1000 2.0 2.0 11 2.0 14

ns

2.3 to 2.7 30 500 2.0 2.0 9.0 2.0 12

2.7 50 500 2.5 2.0 8.5 2.0 10

3.0 to 3.6 50 500 2.5 2.0 7.5 2.0 9.0

t

OSLH

t

OSHL

Output To Output

Skew Time (note1,

2)

2.7 to 3.6 1 1 ns

Symbol Parameter

Test Condition Value

Unit

V

CC

(V)

T

A

= 25 °C

Min. Typ. Max.

C

IN

Input Capacitance

4pF

C

PD

Power Dissipation Capacitance

(note 1)

1.8 f

IN

= 10MHz 28

pF2.5 30

3.3 34