SGS Thomson Microelectronics 74VHC245 Datasheet



■ HIGHSPEED:t

■ LOW POWER DISSIPATION:

=4 µA (MAX.)at TA=25oC

I

CC

■ HIGHNOISEIMMUNITY:

V

NIH=VNIL

■ POWERDOWNPROTECTIONON CONTROL

=28%VCC(MIN.)

=4.0ns(TYP.)atVCC=5V

PD

INPUTS

■ SYMMETRICALOUTPUTIMPEDANCE:

|I

|=IOL=8 mA(MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■ OPERATINGVOLTAGERANGE:

(OPR)= 2Vto 5.5V

V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

74SERIES245

■ IMPROVEDLATCH-UP IMMUNITY

■ LOWNOISEV

=0.9V(Max.)

OLP

DESCRIPTION

The 74VHC245 is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with sub-micron silicon gate and double-layermetal wiring C

2

MOS technology.

This IC is intended for two-way asynchronous communication between data busses; the direction of data trasmission is determinedby the level of the DIR input. The enable input G can be

74VHC245

OCTAL BUS

TRANSCEIVER(3-STATE)

PRELIMINARY DATA

M

(Micro Package)

(TSSOPPackage)

ORDERCODES :

74VHC245M 74VHC245T

used to disable the device so that the busses are effectivelyisolated. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2kV ESD immunity and transient excess voltage.

IT IS PROHIBITED TO APPLY A SIGNAL TO A TERMINAL WHEN IT IS IN OUTPUT MODE AND WHEN A BUS TERMINAL IS FLOATING (HIGH IMPEDANCE STATE) IT IS REQUESTED TO FIX THE INPUT LEVEL BY MEANS OF EXTERNAL PULL DOWN OR PULL UP RESISTOR.

T

PIN CONNECTION AND IEC LOGICSYMBOLS

June 1999

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74VHC245

INPUT EQUIVALENTCIRCUIT

TRUTH TABLE

INP UT FUNCTI O N OUT P UT

GDIRABUSBBUS

L L OUTPUT INPUT A = B L H INPUT OUTPUT B = A

HXZZZ

X:”H” or”L” Z:Highimpedance

PIN DESCRIPTION

PI N No SYM BO L NAM E AND F U NCTIO N

1 DIR Directional Control

2, 3, 4, 5,

6, 7, 8,9

18, 17, 16, 15, 14, 13,

12, 11

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

A1 to A8 Data Inputs/Outputs

B1 to B8 Data Inputs/Outputs

CC

Positive Supply Voltage

ABSOLUTE MAXIMUMRATINGS

Symb o l Para met er Val u e Uni t

V

I

OK

I

or I

I

CC

T

AbsoluteMaximumRatingsarethosevalues beyond whichdamagetothedevicemayoccur.Functionaloperationunderthesecondition isnotimplied.

Supply Voltage -0.5 to +7.0 V

CC

DC Input Voltage (DIR, G) -0.5 to +7.0 V

I

Bus I/O Voltage -0.5 to VCC+ 0.5 V

I/O

DC Output Voltage -0.5 to VCC+ 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

GND

Storage Temperature -65 to +150

stg

Lead Temperature (10 sec) 300

L

75 mA

±

o

C

o

C

RECOMMENDEDOPERATINGCONDITIONS

Symb o l Para met er Value Un it

V

T

dt/dv

1)VINfrom30%to70%of V

Supply Voltage 2.0 to 5.5 V

CC

Input Voltage (DIR, G) 0 to 5.5 V

I

Bus I/O Voltage 0 to V

I/O

Output Voltage 0 to V

O

Operating Temperature -40 to +85

op

(V

CC CC

=3.3±0.3V) =5.0±0.5V)

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

CC

CC CC

0 to 100

0to20

V V

o

C

ns/V ns/V

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74VHC245

DC SPECIFICATIONS

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

T

V

CC

High Level Input

V

IH

Voltage

V

Low Level Input

IL

Voltage

V

High Level Output

OH

Voltage

Low Level Output

V

OL

Voltage

High Impedance

I

OZ

Output Leakage

(V)

2.0 1.5 1.5

3.0 to 5.5 0.7V

2.0 0.5 0.5

3.0 to 5.5 0.3V

2.0 IO=-50 µA 1.9 2.0 1.9

3.0 I

4.5 I

3.0 I

4.5 I

=-50µA 2.9 3.0 2.9

O

=-50µA 4.4 4.5 4.4

O

=-4 mA 2.58 2.48

O

=-8 mA 3.94 3.8

O

2.0 IO=50 µ A 0.0 0.1 0.1

3.0 I

4.5 I

3.0 I

4.5 I

=50µA 0.0 0.1 0.1

O

=50µA 0.0 0.1 0.1

O

=4 mA 0.36 0.44

O

=8 mA 0.36 0.44

O

VI=VIHor V

5.5

VO=VCCor GND

Min. Typ. Max. Min. Max.

IL

Current Input Leakage Current 0 to 5.5 VI= 5.5V or GND ±0.1 ±1.0 µA

I

Quiescent Supply

I

CC

5.5 VI=VCCorGND 4 40

Current

=25oC -40 to 85oC

A

CC

0.7V

CC

±0.25 ±2.5 µA

CC

0.3V

CC

µ

V

A

AC ELECTRICAL CHARACTERISTICS (Inputtr=tf=3 ns)

Symbol Parameter Test Condition Value Unit

t

Propagation Delay

PLH

t

Time

PHL

t

Output Disable Time 3.3

PLZ

t

PHZ

t

Output Enable Time 3.3

PZL

t

PZH

t t

(*) Voltagerangeis3.3V ± 0.3V (**) Voltagerange is 5V± 0.5V Note1:Parameterguaranteed bydesign. t

Output to Output Skew

OSLH

Time (note 1)

OSHL

soLH

V

(V)

3.3

5.0

3.3

5.0

3.3

5.0

=|t

pLHm-tpLHn

CC

(**) (**)

(**)

C

L

(pF)

(*)

15 5.8 8.4 1.0 10.0

(*)

50 8.3 11.9 1.0 13.5

T

=25oC -40 to 85oC

A

Min. Typ. Max. Min. Max.

15 4.0 5.5 1.0 6.5 50 5.5 7.5 1.0 8.5

(*)

15 RL=1K

(*)

50 RL=1KΩ 11.0 16.7 1.0 19.0

Ω

8.5 13.2 1.0 15.5

15 RL=1KΩ 5.8 8.5 1.0 10.0 50 RL=1KΩ 7.3 10.6 1.0 12.0

(*)

50 RL=1KΩ 11.5 15.8 1.0 18.0 50 RL=1K

(*)

50 1.5 1.5 ns

Ω

50

|,t

soHL

=|t

pHLm-tpHLn

|

7.0 9.7 1.0 11.0

1.0 1.0

ns

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