Fairchild Semiconductor 74ALVCH245 Datasheet

September 2001
Revised February 2002

74ALVCH245
Low Voltage Bidirectional Transceiver with Bushold

74ALVCH245 Low Voltage Bidirectional Transceiver with Bushold

General Description

The ALVCH245 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 ALVCH245
data inputs include active bush old circu itry, eliminating the
need for external pull-up re sistors to hold unused or floa t­ing data inputs at a valid logic level.

The 74ALVCH245 is designed for low voltage (1.65V to

3.6V) V
The 74ALVCH245 is fabricated wi th an advanced CMOS

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

applications.

CC

input determines the direction

input disables b oth th e A and B P o rts

Features

■ 1.65V to 3.6V VCC supply operation

■ Bushold on data inputs eliminates the need for external

pull-up/pull-down resistors

■ t

PD

3.6 ns max for 3.0V to 3.6V V

4.2 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

> 200V

CC
CC

CC

> 2000V

Ordering Code:

Order Number Package Num ber Package Description

74ALVCH245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74ALVCH245MTC 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

Output Enable Input (Active LOW)
Transmit/Receive Input

Side A Bushold Inputs or 3 -STA T E Ou tputs
Side B Bushold Inputs or 3 -STA T E Ou tputs

A

B

OE
T/R

0–A7

0–B7

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

© 2002 Fairchild Semiconductor Corporation DS500648 www.fairchildsemi.com

Connection Diagram Truth Table

Inputs Outputs

OE

74ALVCH245

L L Bus B0–B7 Data to Bus A0–A
L H Bus A0–A7 Data to Bus B0–B
H X HIGH Z State on A0–A7, B0–B7

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

Logic Diagram

T/R

7

7

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Absolute Maximum Ratings(Note 1) 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 2) −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 1: 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 2: I

O

Note 3: Floating or unused control inputs must be held HIGH or LOW.

(Note 3)

)0V to V

I

∆t/∆V)

DC Electrical Characteristics

V

Symbol Parameter Conditions

V

IH

V

IL

V

OH

V

OL

I

I

I

I(HOLD)

I

OZ

I

CC

∆I

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
Bushold Input Minimum VIN = 0.58V 1.65 25
Drive Hold Current VIN = 1.07V 1.65 −25

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

CC

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

VIN = 0.7V 2.3 45
VIN = 1.7V 2.3 −45
VIN = 0.8V 3.0 75
VIN = 2.0V 3.0 −75
0 < VO ≤ 3.6V 3.6 ±500

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

74ALVCH245

CC
CC

V2.3 - 2.7 1.7

CC

V2.3 - 2.7 0.7

V

V

µA

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