SGS Thomson Microelectronics 74VHC240 Datasheet



74VHC240

OCTAL BUS BUFFER

WITH 3 STATE OUTPUTS (INVERTED)

■ HIGHSPEED:t

■ LOW POWERDISSIPATION:

=4 µA (MAX.) at TA=25oC

I

CC

■ HIGHNOISEIMMUNITY:

V

NIH=VNIL

■ POWERDOWNPROTECTIONON INPUTS

■ SYMMETRICALOUTPUTIMPEDANCE:

|=IOL=8 mA (MIN)

|I

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

■ OPERATINGVOLTAGERANGE:

V

(OPR)= 2Vto 5.5V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

=28%VCC(MIN.)

PHL

=3.6ns(TYP.)atVCC=5V

PD

74SERIES240

■ IMPROVEDLATCH-UP IMMUNITY

■ LOWNOISE:V

= 0.9V(Max.)

OLP

DESCRIPTION

The 74VHC240 is an advanced high-speed
CMOS OCTAL BUS BUFFER (3-STATE)
fabricated with sub-micron silicon gate and
double-layermetal wiring C

2

MOS technology.

G output enable governsfour BUS BUFFERs.

M

(Micro Package)

(TSSOPPackage)

T

ORDERCODES :

74VHC240M 74VHC240T

This device is designed to be used with 3 state
memoryaddressdrivers, etc.
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 interface5V to 3V.

All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.

PIN CONNECTIONAND IEC LOGIC SYMBOLS

June 1999

1/8

74VHC240

INPUT EQUIVALENTCIRCUIT

TRUTH TABLE

GAnYn

LLH
LHL

HXZ

X:”H” or”L”
Z:Highimpedance

PIN DESCRIPTION

PI N No SYM BO L NAM E AND F UNCT I ON

1 1G Output Enable Input
2,4,6,8 1A1to1A4 Data Inputs
9,7,5,3 2Y1to2Y4 Data Outputs

11,13,15,17 2A1to2A4 Data Inputs
18,16,14,12 1Y1to1Y4 Data Outputs

19 2G Output Enable Input
10 GND Ground (0V)
20 V

INPUT OUTPU T

Positive Supply Voltage

CC

ABSOLUTE MAXIMUM RATINGS

Symb o l Para met er Val u e Uni t

V

V

V

I

I

OK

I

orI

I

CC

T

T

AbsoluteMaximum Ratingsarethosevalues beyond whichdamagetothedevicemayoccur. Functionaloperationunder these condition isnotimplied.

Supply Voltage -0.5to+7.0 V

CC

DC Input Voltage -0.5to+7.0 V

I

DC Output Voltage -0.5toVCC+0.5 V

O

DC Input Diode Current -20 mA

IK

DC Output Diode Current ±20 mA
DC Output Current ±25 mA

O

DC VCCor Ground Current ±75 mA

GND

Storage Temperature -65to+150

stg

Lead Temperature (10 sec) 300

L

o

C

o

C

RECOMMENDEDOPERATINGCONDITIONS

Symb o l Para met er Value Un it

V

V

V

T

dt/dv

1)VINfrom30%to70%of V

Supply Voltage 2.0to5.5 V

CC

Input Voltage 0to5.5 V

I

Output Voltage 0toV

O

Operating Temperature -40to+85

op

(V

CC
CC

=3.3±0.3V)
=5.0±0.5V)

Input Rise and Fall Time (see note 1) (V

CC

CC

0to100

0to20

V

o

C

ns/V
ns/V

2/8

74VHC240

DC SPECIFICATIONS

Symb o l Para met er Test Con diti o ns Val u e Unit

T

V

CC

(V)

High Level Input

V

IH

Voltage

V

Low Level Input

IL

Voltage

V

High Level Output

OH

Voltage

2.0 1.5 1.5

3.0to 5.5 0.7V

2.0 0.5 0.5

3.0to 5.5 0.3V

2.0 IO=-50µA1.92.0 1.9

3.0 I

4.5 I

3.0 I

4.5 I

Low Level Output

V

OL

Voltage

2.0 IO=50µA 0.0 0.1 0.1

3.0 I

4.5 I

3.0 I

4.5 I

High Impedance

I

OZ

Output Leakage

5.5

Current
Input Leakage Current 0to5.5 VI=5.5Vor GND

I

I

Quiescent Supply

I

CC

5.5 VI=VCCorGND 4 40

Current

Min. Typ. Max. Min. Max.

=-50µA2.93.0 2.9

O

=-50µA4.44.5 4.4

O

=-4mA 2.58 2.48

O

=-8mA 3.94 3.8

O

=50µA 0.0 0.1 0.1

O

=50µA 0.0 0.1 0.1

O

=4mA 0.36 0.44

O

=8mA 0.36 0.44

O

VI=VIHorV

IL

VO=VCCorGND

=25oC -40 to 85oC

A

±

±

0.7V

CC

0.25

0.1

CC

CC

0.3V

±

±

2.5

1.0

CC

µ

µ
µ

V

V

V

V

A

A
A

AC ELECTRICALCHARACTERISTICS (Inputtr=tf=3 ns)

Symbol Parameter Test Conditi on Value Unit

t

Propagation Delay

PLH

t

Time

PHL

Output Enable Time 3.3

t

PZL

t

PZH

t

Output Disable Time 3.3

PLZ

t

PHZ

t
t

(*) Voltage rangeis3.3V ±0.3V
(**) Voltagerangeis 5V±0.5V
Note1:Parameterguaranteedbydesign. t

Output to Output Skew

OSLH

Time (note 1)

OSHL

soLH

V

(V)

3.3

3.3

5.0

5.0

3.3

5.0

5.0

5.0

3.3

5.0

=|t

pLHm-tpLHn

CC

C

L

(pF)

(*)

(*)
(**)
(**)

(*)

(*)
(**)
(**)

(*)
(**)

(*)
(**)

15 5.3 7.5 1.0 9.0
50 7.8 11.0 1.0 12.5
15 3.6 5.5 1.0 6.5
50 5.1 7.5 1.0 8.5
15 RL=1KΩ 6.6 10.6 1.0 12.5
50 RL=1K
15 RL=1KΩ 4.7 7.3 1.0 8.5
50 RL=1K
50 RL=1KΩ 10.3 14.0 1.0 16.0
50 RL=1K
50 1.5 1.5 ns
50

|,t

soHL

=|t

pHLm-tpHLn

|

Min. Typ. Max. Min. Max.

Ω

Ω

Ω

=25oC -40 to 85oC

T

A

9.1 14.1 1.0 16.0

6.2 9.3 1.0 10.5

6.7 9.2 1.0 10.5

1.0 1.0

ns

ns

ns

3/8