ST 74LVX3245 User Manual

74LVX3245

OCTAL DUAL SUPPLY BUS TRANSCEIVER

■ HIGH SPEED:

t

= 8ns (MAX.) at TA=25°C

PD

V

= 3.3V, V

CCA

■ LOW POWER DISSIPATION:

I

= I

CCA

■ LOW NOISE: V

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

| = IOL = 24mA (MIN)

OH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PLH

■ OPERATING VOLT AG E R AN GE:

V

CCA

V

CCB

= 5µA(MAX.) at TA=25°C

CCB

PHL

(OPR) = 2.7V to 3.6V (1.2V Data Retention) (OPR) = 4.5V to 5.5V (1.2V Data Retention)

= 5.0V

CCB

=0.3V (TYP.) at VCC =3.3V

OLP

PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 3245

■ IMPROVED LATCH-UP I MMUN ITY

DESCRIPTION

The 74LVX3245 is a dual supply low voltage CMOS OCTAL BUS TRANSCEIVER fabricated with sub-micron silicon gate and double-layer metal wiring C

2

MOS technology. Designed for use as an interface between a 5V bus and a 3. 3V bus in a mixed 5V/3.3V supply systems, it achieves high speed operation while maintaining the CMOS low power dissipation.

TSSOPSOP

Table 1: Order Codes

PACKAGE T & R

SOP 74LVX3245MTR

TSSOP 74LVX3245TTR

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. The A-port interfaces with the 3V bus, the B-port with the 5V bus. All inputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.

Figure 1: Pin Connection And IEC Logic Symbols

Rev. 4

1/13August 2004

74LVX3245

Figure 2: Input And Output Equivalent Circuit Table 2: Pin Description

PIN N° SYMBOL NAME QND FUNCTION

2 DIR Directional Control

3, 4, 5, 6, 7,

8, 9, 10

21, 20, 19, 18, 17, 16,

15, 14

22 G

11, 12, 13 GND Ground (0V)

23 NC Not Connected

1V

24 V

Table 3: Truth Tab l e

A1 to A8 Data Inputs/Outputs

B1 to B8 Data Inputs/Outputs

Output Enable Input

CCA CCB

Positive Supply Voltage 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

X : Don’t Care Z : High Impedance

Table 4: Absolute Maximum Ratings

Symbol Parameter Value Unit

V

CCA

V

CCB

V

I/OA

V

I/OB

I

OK

I

OA

I

OB

I

CCA

I

CCB

P

T

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

Supply Voltage Supply Voltage DC Input Voltage -0.5 to V

I

DC I/O Voltage -0.5 to V DC I/O Voltage -0.5 to V DC Input Diode Current

IK

DC Output Diode Current DC Output Current DC Output Current DC VCC or Ground Current DC VCC or Ground Current Power Dissipation

d

Storage Temperature

stg

Lead Temperature (10 sec)

L

-0.5 to +7.0 V

-0.5 to +7.0 V + 0.5

CCA

+ 0.5

CCA

+ 0.5

CCB

± 20 mA ± 50 mA ± 50 mA

± 50 mA ± 200 mA ± 100 mA

180 mW

-65 to +150 °C 300 °C

V V V

2/13

74LVX3245

Table 5: Recommended Operating Conditions

Symbol Parameter Value Unit

V

CCA

V

CCB

V

I/OA

V

I/OB

T

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

Supply Voltage (note 1) Supply Voltage (note 1) Input Voltage 0 to V

I

I/O Voltage 0 to V I/O Voltage 0 to V Operating Temperature

op

2.7 to 3.6 V

4.5 to 5.5 V

CCA CCA CCB

-55 to 125 °C

V V V

1) VIN from 30 % t o 70% of V

2) V

= 2.7 to 3.6V; V

CCA

CC

= 4.5 to 5.5V;

CCB

Table 6: DC Specifications For V

Test Condition Value

Symbol Parameter

V

High Level Input

IHA

Voltage

V

Low Level Input

ILA

Voltage

V

High Level

OHA

Output Voltage

Low Level Output

OLA

Voltage

Input Leakage

I

IA

Current High Impedance

I

OZA

Output Leakage Current

I

∆I

Qui esce nt Su pply

CCtA

Current

Maximum

CCtA

Qui esce nt Su pply Current / Input (An, DIR, G

V

CCA

(V)

3.6 5.0 2.0 2.0 2.0

2.7 5.0 2.0 2.0 2.0

3.6 5.0 0.8 0.8 0.8

2.7 5.0 0.8 0.8 0.8

3.0 4.5

2.7 4.5

3.0 4.5

2.7 4.5

3.6 5.5

3.6 5.5 VIA = V

3.6 5.5 V

)

CCB

CCA

IO=-100 µA

= VCC or GND

V

I

VIB = V

V

I/OA

VIB = V

= V

IA

V

I

=-24 mA

O

=-12 mA

I

O

=-24 mA

I

O

IO=100 µA

I

=24 mA

O

I

=12 mA

O

=24 mA

I

O

or V

IHA

or V

IHB

= V

CCA

GND

CCA

GND

CCB

GND

- 0.6V

CCA

= V

IB

CCB

GND

= 25 °C

T

A

-40 to 85 °C -55 to 125°C

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

2.9 2.99 2.9 2.9

2.35 2.65 2.25 2.25

2.3 2.5 2.2 2.2

2.1 2.3 2.0 2.0

0.002 0.1 0.1 0.1

0.21 0.36 0.44 0.44

0.11 0.36 0.44 0.44

0.22 0.42 0.5 0.5 ± 0.1 ± 1 ± 1 µA

ILA ILB

± 0.5 ± 5 ± 5 µA

or

55050µA

or

0.35 0.5 0.5 mA

or

Unit

V

3/13

74LVX3245

Table 7: DC Specifications For V

Test Condition Value

Symbol Parameter

V

High Level Input

IHB

Voltage

V

Low Level Input

ILB

Voltage

V

High Level

OHB

Output Voltage Low Level Output

OLB

Voltage Input Leakage

I

IB

Current High Impedance

I

OZB

Output Leakage Current

I

∆I

Qui esce nt Su pply

CCtB

Current

Maximum

CCtB

Qui esce nt Su pply Current / Input

V

CCA

(V)

3.3 4.5 2.0 2.0 2.0

3.3 5.5 2.0 2.0 2.0

3.3 4.5 0.8 0.8 0.8

3.3 5.5 0.8 0.8 0.8

3.0 4.5

3.3 4.5

3.0 4.5

3.3 4.5

3.6 5.5

3.6 5.5 VIA = V

CCB

I

O

I

O

IO=100 µA

I

O

= V

V

I

V

I/Ob

V

IB

VIB = V

=-100 µA

=-24 mA

=24 mA

or GND

CCA

or V

IHA

= V

CCb

GND

CCA

GND

= V

CCB

GND

CCA

GND

- 2.1V

CCB

= 25 °C

T

A

-40 to 85 °C -55 to 125°C

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

4.4 4.5 4.4 4.4

3.86 4.25 3.75 3.75

0.002 0.1 0.1 0.1

0.18 0.36 0.44 0.44 ± 0.1 ± 1 ± 1 µA

ILA

± 0.5 ± 5 ± 5 µA

or

88080µA

or

1.35 1.5 1.5 mA

Unit

V

Table 8: Dynamic Switching Characteristics

Test Condition Value

= 25 °C

Symbol Parameter

V

OLPA

Dynamic Low Level Quiet Output (note 1, 2)

OLPB

Dynamic Low Level Quiet

V

Output (note 1, 2)

V

IHDA

Dynamic High Voltage Input

V

CCA

CCB

(V)

3.3 5.0 1.0 1.5

3.3 5.0 -1.2 -0.6

3.3 5.0 0.8 1.2

3.3 5.0 -0.8 -0.5

3.3 5.0 2 V

(note 1, 3)

ILDA

Dynamic Low Voltage Input

3.3 5.0 0.8 V

V

(note 1, 3)

V

IHDB

Dynamic High Voltage Input

3.3 5.0 2 V

(note 1, 3)

V

ILDB

Dynamic Low Voltage Input

3.3 5.0 0.8 V

(note 1, 3)

1) Worst case package

2) Max number of outp ut defined as (n). Data inputs are driven 0V to 3. 3V, (n-1) ou tp uts switchi ng and one outpu t at GND

3) Max number of data in puts (n) switching. (n-1) switching 0V to 3.3V . I nputs under tes t switching : 3V to threshol d (V ) f = 1MHz

(V

IHD

T

A

-40 to 85 °C -55 to 125°C

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

ILD

Unit

V

). 0V to threshold

4/13