NSC 5962-9862001QLA, 5962-9862001QKA Datasheet

54LVXC4245
8-Bit Dual Supply Configurable Voltage Interface
Transceiver with TRI-STATE

®

Outputs

General Description

The LVXC4245 is a 24-pin dual-supply, 8-bit configurable
voltage interface transceiver suited for real time configurable
I/O applications. The V

CCA

pin accepts a 5V supply level.

The “A” port is a dedicated 5V port. The V

CCB

pin accepts a
3V-to-5V supply level. The “B” port is configured to track the
V

CCB

supply level respectively.A5V level on the VCCpin will

configure the I/O pins at a 5V level and a 3V V

CC

will config-

ure the I/O pins at a 3V level. This device will allow the V

CCB

voltage source pin and I/O pins on the “B” port to float when
OE is HIGH. This feature is necessary to buffer data to and
from a socket that permits live insertion and removal during
normal operation.

Features

n Bidirectional interface between 5V and 3V-to-5V buses
n Control inputs compatible with TTL level
n Outputs source/sink up to 24 mA
n Available in Cerpack and CDIP packages
n Implements patented EMI reduction circuitry
n Flexible V

CCB

operating range

n Allows B port and V

CCB

to float simultaneously when OE

is HIGH

n Functionally compatible with the 54 series 245
n Standard Microcircuit Drawing (SMD) 5962-9862001

Ordering Code

Order Number Package Number Package Description

54LVXC4245W-QML W24C 24-Lead Ceramic Flatpack
54LVXC4245J-QML J24F 24-Lead Ceramic Dual-in-line

Logic Symbol

Pin Descriptions

Pin Names Description

OE

Output Enable Input

T/R

Transmit/Receive Input

A

0–A7

Side A Inputs or TRI-STATE Outputs

B

0–B7

Side B Inputs or TRI-STATE Outputs

Connection Diagram

TRI-STATE®is a registered trademark of National Semiconductor Corporation

DS101033-1

Pin Assignment

for Cerpack and CDIP

DS101033-2

March 1999

54LVXC4245 8-Bit Dual Supply Configurable Voltage Interface Transceiver with TRI-STATE

Outputs

© 1999 National Semiconductor Corporation DS101033 www.national.com

Truth Table

Inputs Outputs

OE

T/R

L L Bus B Data to Bus A
L H Bus A Data to Bus B

H X HIGH-Z State

Logic Diagram

DS101033-4

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage (V

CCA,VCCB

) −0.5V to +7.0V

DC Input Voltage (V

I

)@OE, T/R −0.5V to V

CCA

+0.5V

DC Input/Output Voltage (V

I/O

)

@

A

n

−0.5V to V

CCA

+0.5V

@

B

n

−0.5V to V

CCB

+0.5V

DC Input Diode Current (I

IK

)

@

OE, T/R

±

20 mA

DC Output Diode Current (I

OK

)

±

50 mA

DC Output Source or

Sink Current (I

O

)

±

50 mA

DC V

CC

or Ground Current

Per Output Pin (I

CC

or I

GND

)

±

50 mA

and Max Current

±

200 mA

Storage Temperature Range

(T

STG

) −65˚C to +150˚C

Recommended Operating
Conditions

(Note 2)

Supply Voltage V

CCA

4.5V to 5.5V

V

CCB

2.7V to 5.5V

Input Voltage (V

I

)@OE , T/R 0V to V

CCA

Input/Output Voltage (V

I/O

)

@

A

n

0V to V

CCA

@

B

n

0V to V

CCB

Free Air Operating Temperature (TA) −55˚C to +125˚C
Minimum Input Edge Rate (∆V/∆t) 8 ns/V

V

IN

from 30%to 70%of V

CC

V

CC

@

3V, 4.5V, 5.5V

Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be op­erated at these limits. The parametric values defined 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 operation.

Note 2: The A port unused pins (inputs and I/O’s) must be held HIGH or
LOW. They may not float.

DC Electrical Characteristics

Symbol Parameter V

CCA

(V)

V

CCB

(V)

T

A

=

−55˚C to

+125˚C

Units Conditions

Guaranteed Limits

V

IHA

Minimum High Level A

n

4.5 2.7 2.0 V V

OUT

≤ 0.1V

Input Voltage OE

4.5 3.6 2.0 or

T/R

5.5 5.5 2.0 ≥ VCC− 0.1V

V

IHB

B

n

4.5 2.7 2.0

4.5 3.6 2.0

4.5 5.5 3.85

V

ILA

Maximum Low Level A

n

4.5 2.7 0.8 V V

OUT

≤ 0.1V

Input Voltage OE

4.5 3.6 0.8 or

T/R

5.5 5.5 0.8 ≥ VCC− 0.1V

V

ILB

B

n

4.5 2.7 0.8

4.5 3.6 0.8

4.5 5.5 1.65

V

OHA

Minimum High Level 4.5 2.7 4.4 V I

OH

=

−100 µA

Output Voltage 5.5 5.5 5.4 I

OH

=

−100 µA

4.5 3.0 3.7 I

OH

=

−24 mA

4.5 4.5 3.7 I

OH

=

−24 mA

V

OHB

4.5 2.7 2.6 V I

OH

=

−100 µA

5.5 5.5 5.4 I

OH

=

−100 µA

4.5 2.7 2.2 I

OH

=

−12 mA

4.5 3.0 2.4 I

OH

=

−12 mA

4.5 3.0 2.2 I

OH

=

−24 mA

4.5 4.5 3.7 I

OH

=

−24 mA

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