Fairchild Semiconductor 74ALVC245 Datasheet

74ALVC245
Low Voltage Bidirectional Transceiver

with 3.6V Tolerant Inputs and Outputs

74ALVC245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs

September 2001
Revised February 2002

General Description

The ALVC245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is in tended for bus ori­ented applications . The T/R
of data flow. The OE
by placing them in a high impedance state.

The 74ALVC245 is designed for low voltage (1.65V to

3.6V) V
The 74ALVC245 is fabricated with an advanced CMOS

technology to achieve high-speed operation while main­taining low CMOS power dissipation.

applications with I/O compatibility up to 3.6V.

CC

input determines the direction

input disables both th e A and B ports

Features

■ 1.65V to 3.6V VCC supply operation

■ 3.6V tolerant inputs and outputs

■ Power-off high impedance inputs and outputs

■ Supports Live Insertion and Withdrawal (Note 1)

■ t

PD

3.4 ns max for 3.0V to 3.6V V

3.9 ns max for 2.3V to 2.7V V
6 ns max for 1.65V to 1.95V V

■ Uses patented Quiet Series noise/EMI reduction

circuitry

■ Latchup conforms to JEDEC JED78

■ ESD performance:

Human body model
Machine model

Note 1: To ensure the high impedance state during power up and power
down, OE

should be tied to VCC through a pul l up res istor. The min imum

n

value of the resistor is dete rmined by the curren t sourcing capabilit y of the
driver.

> 200V

CC
CC

CC

> 2000V

Ordering Code:

Order Number Package Number Package Description

74ALVC245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74ALVC245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.

Logic Symbol Pin Descriptions

Pin Names Description

OE
T/R
A

0–A7

B

0–B7

Quiet Series is a tra demark of Fairchild Semiconductor Corp oration.

© 2002 Fairchild Semiconductor Corporation DS500647 www.fairchildsemi.com

Output Enable Input (Active LOW)
Transmit/Receive Input

Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs

Connection Diagram Truth Table

Inputs Outputs

OE

74ALVC245

LLBus B0–B7 Data to Bus A0–A
LHBus A0–A7 Data to Bus B0–B
H X HIGH Z State on A0–A7, B0–B7 (Note 2)

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance

Note 2: Unused bus terminals during HIGH Z State must be held HIGH or
LOW.

Logic Diagram

T/R

7
7

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Absolute Maximum Ratings(Note 3) Recommended Operating

Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
Output Voltage (V
DC Input Diode Current (I

V

< 0V −50 mA

I

DC Output Diode Current (I

< 0V −50 mA

V

O

) −0.5V to 4.6V

I

) (Note 4) −0.5V to VCC +0.5V

O

)

IK

)

OK

DC Output Source/Sink Current

(I

) ±50 mA

OH/IOL

or GND Current per

DC V

CC

Supply Pin (I

Storage Temperature Range (T

or GND) ±100 mA

CC

) −65°C to +150°C

STG

Conditions

Power Supply

Operating 1.65V to 3.6V
Input Voltage (V
Output Voltage (VO)0V to V
Free Air Operating Temperature (TA) −40°C to +85°C
Minimum Input Edge Rate (

= 0.8V to 2.0V, VCC = 3.0V 10 ns/V

V

IN

Note 3: The Absolute Maxi mum Ratings are thos e values beyond which
the safety of the d evice cannot b e guaranteed . The device sh ould not be
operated at these limit s. The parametric values defi ned in the Electrical
Characteristics tables are not guaranteed at the Absolute Maximum Rat­ings. The “Recommended Operating Conditions” table will define the condi­tions for actual device oper ation.

Absolute Maximum Rating must be observed, limited to 4.6V.

Note 4: I

O

Note 5: Floating or unused control inputs must be held HIGH or LOW.

(Note 5)

)0V to V

I

∆t/∆V)

DC Electrical Characteristics

V

Symbol Parameter Conditions

V

IH

V

IL

V

OH

V

OL

I

I

I

OZ

I

CC

∆I

CC

HIGH Level Input Voltage 1.65 - 1.95 0.65 x V

LOW Level Input Voltage 1.65 - 1.95 0.35 x V

HIGH Level Output Voltage IOH = −100 µA 1.65 - 3.6 VCC - 0.2

LOW Level Output Voltage IOL = 100 µA 1.65 - 3.6 0.2

Input Leakage Current 0 ≤ VI ≤ 3.6V 3.6 ±5.0 µA
3-STATE Output Leakage 0 ≤ VO ≤ 3.6V 3.6 ±10 µA
Quiescent Supply Current VI = VCC or GND, IO = 0 3.6 10 µA
Increase in ICC per Input VIH = VCC − 0.6V 3 - 3.6 750 µA

IOH = −4 mA 1.65 1.2
I

= −6 mA 2.3 2.0

OH

= −12 mA 2.3 1.7

I

OH

IOH = −24 mA 3.0 2

I

= 4 mA 1.65 0.45

OL

= 6 mA 2.3 0.4

I

OL

IOL = 12 mA 2.3 0.7

IOL = 24 mA 3.0 0.55

CC

(V)

2.7 - 3.6 2.0

2.7 - 3.6 0.8

2.7 2.2

3.0 2.4

2.7 0.4

Min Max Units

CC

74ALVC245

CC
CC

V2.3 - 2.7 1.7

CC

V2.3 - 2.7 0.7

V

V

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