ST 74LVX126 User Manual

74LVX126

LOW VOLTAGE CMOS QUAD BUS BUFFERS (3-STATE)

WITH 5V TOLERANT INPUTS

■ HIGH SPEED:

t

=4.4ns (TY P.) at VCC = 3.3V

PD

■ 5V TOLERANT INPUTS

■ POWER-DOWN PROTECTION ON INPUTS

■ INPUT VOLTAGE LEVEL:

V

= 0.8V, VIH = 2V at VCC =3V

IL

■ LOW POWER DISSIPATION:

I

= 2 µA (MAX.) at TA=25°C

CC

■ LOW NOISE:

V

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

OLP

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

| = IOL = 4 mA (MIN) at VCC =3V

OH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PLH

PHL

■ OPERATING VOLTAGE RANGE:

V

(OPR) = 2V to 3.6V (1.2V Data Retention)

CC

■ PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 126

■ IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The 74LVX126 is a low voltage CMOS QUAD BUS BUFFERs 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.

TSSOPSOP

Table 1: Order Codes

PACKAGE T & R

SOP 74LVX126MTR

TSSOP 74LVX126TTR

This device requires the 3-STATE control input G to be set low to plac e the output go i n to the hi gh impedance state. 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 static disc harge, giving them 2KV ESD immunity and transient excess voltage.

Figure 1: Pin C onnection And IEC Logic Symbol s

Rev. 2

1/12August 2004

74LVX126

Figure 2: Input Equivalent Circuit Table 2: Pin Description

PIN N° SYMBOL NAME AND FUNCTION

1, 4, 10, 13 1G to 4G Output Enable Inputs

2, 5, 9, 12 1A to 4A Data Inputs 3, 6, 8, 11 1Y to 4Y Data Outputs

7 GND Ground (0V)

14

Table 3: Truth Table

AGY

XLZ

LHL

HHH

X :Don‘t Care Z : High Impedance

Table 4: Absolute Maximum Ratings

Symbol Parameter Value Unit

V

I

OK

I

or I

I

CC

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

CC

DC Input Voltage

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current DC Output Current

O

DC VCC or Ground Current

GND

Storage Temperature

stg

Lead Temperature (10 sec)

L

Table 5: Recommended Operating Conditions

V

CC

Positive Supply Voltage

-0.5 to +7.0 V

- 20 mA

± 20 mA ± 25 mA ± 50 mA

-65 to +150 °C 300 °C

V

Symbol Parameter Value Unit

V

V V T

dt/dv

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

2) VIN from 0.8V to 2.0V

Supply Voltage (note 1)

CC

Input Voltage

I

Output Voltage 0 to V

O

Operating Temperature

op

Input Rise and Fall Time (note 2) (V

CC

= 3V)

2 to 3.6 V 0 to 5.5 V

CC

-55 to 125 °C 0 to 100 ns/V

2/12

V

Table 6: DC Specifications

Symbol Parameter

V

High Level Input

IH

Voltage

V

Low Level Input

IL

Voltage

High Level Output

OH

Voltage

Low Level Output

OL

Voltage

High Impedance

I

OZ

Output Leakage Current

I

Input Leakage

I

Current

I

Quiescent Supply

CC

Current

74LVX126

Test Condition Value

= 25°C

T

V

CC

(V)

A

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

2.0 1.5 1.5 1.5 222

3.6

2.4 2.4 2.4

2.0 0.5 0.5 0.5

3.6 0.8 0.8 0.8

=-50 µA

2.0

3.0

2.0

3.0

3.6

V

VO = VCC or GND

= 5.5V or GND

V

I

V

I

O

=-50 µA

I

O

=-4 mA

I

O

IO=50 µA I

=50 µA

O

=4 mA

I

O

= VIH or V

I

= VCC or GND

1.9 2.0 1.9 1.9

2.9 3.0 2.9 2.9

2.58 2.48 2.4

0.0 0.1 0.1 0.1

IL

±0.25 ± 2.5 ± 5 µA

-40 to 85°C -55 to 125°C

0.36 0.44 0.55

± 0.1 ± 1 ± 1 µA

22020µA

Unit

V3.0

V3.0 0.8 0.8 0.8

V3.0

Table 7: Dynamic Switching Characteristics

Test Condition Value

= 25°C

Symbol Parameter

V V

Dynamic Low

OLP

Voltage Quiet

OLV

Output (note 1, 2)

V

CC

(V)

3.3

T

A

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

0.3 0.5

-0.5 -0.3

Dynamic High

V

IHD

Voltage Input

3.3 2.0

= 50 pF

C

L

(note 1, 3) Dynamic Low

V

ILD

Voltage Input

3.3 0.8

(note 1, 3)

1) Worst case package.

2) Max number of outp ut s defined as (n). Data inp ut s 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 ), f=1MHz.

(V

IHD

-40 to 85°C -55 to 125°C

ILD

Unit

V

), 0V to thresho l d

3/12

74LVX126

Table 8: AC Electrical Characteristics (Input tr = tf = 3ns)

Test Condition Value

= 25°C

Symbol Parameter

t

Propagation Delay

PLH PHL

PZL

PZH

PLZ

PHZ

Time

Output Enable Time

Output Disable Time

Output to Output Skew Time (note 1,2)

0.3V

t

t t

t

OSLH

t

OSHL

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 m e di rection, ei ther HIGH or LOW

2) Param eter guaran teed by design

(*) Voltage range is 3.3V ±

V

C

CC

(V)

L

(pF)

2.7 15 5.8 8.0 1.0 9.6 1.0 11.5

2.7 50 7.0 10.5 1.0 12.6 1.0 15.0

(*)

3.3

15 4.4 6.2 1.0 8.5 1.0 9.5

(*)

50 5.9 9.7 1.0 12.0 1.0 13.5

2.7 15 8.9 11.5 1.0 12.5 1.0 12.5

2.7 50 10.0 14.0 1.0 16.0 1.0 16.0

(*)

3.3

15 8.0 10.4 1.0 11.5 1.0 11.5

(*)

50 8.9 12 1.0 13.0 1.0 13.0

2.7 50 7.2 11.0 1.0 13.0 1.0 15.6

(*)

3.3

50 6.0 8.5 1.0 11.0 1.0 13.0

2.7 50 0.5 1.0 1.5 1.5

(*)

3.3

50 0.5 1.0 1.5 1.5

T

A

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

Table 9: Capacitive Characteristics

-40 to 85°C -55 to 125°C

Unit

ns

Test Condition Value

Symbol Parameter

C

Input Capacitance

IN

Output

OUT

Capacitance Power Dissipation

PD

Capacitance

T

V

CC

(V)

A

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

3.3 4 10 10 10 pF

3.3 6 pF

3.3 14 pF

-40 to 85°C -55 to 125°C

Unit

= 25°C

(note 1)

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

= CPD x VCC x fIN + ICC/4 (per c ircuit )

CC(opr)

4/12