Fairchild Semiconductor 74LVXC3245WMX, 74LVXC3245WM, 74LVXC3245QSC, 74LVXC3245MTCX, 74LVXC3245MTC Datasheet

© 1999 Fairchild Semiconductor Corporation DS012008 www.fairchildsemi.com

February 1994
Revised July 1999

74LVXC3245 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs

74LVXC3245
8-Bit Dual Supply Configurable Voltage Interface

Transceiver with 3-STATE Outputs

General Description

The LVXC3245 is a 24-pin dual-su pply, 8-bit configurable
voltage interface transc eiver suited for PCMCIA and other
real time configurable I/O applications. The V

CCA

pin

accepts a 3V supply level. T he A Port is a dedicated 3V
port. The V

CCB

pin accepts a 3V-to-5V supply l evel. T he B

Port is configured to track the V

CCB

supply level respec-

tively. A 5V level on the V

CC

pin will configure the I/O pins

at a 5V level and a 3V V

CC

will configure the I/O pins at a

3V level. The A Port should interface with a 3V host system
and the B Port to the card slots. This device will allow the
V

CCB

voltage source pin and I/O pins on the B Port t o float

when OE

is HIGH. This feature is necessa ry to bu ffer data
to and from a PCMCIA socket that permits PCMCIA car ds
to be inserted and removed during normal operation.

Features

■ Bidirectional interface between 3V and 3V-to-5V buses

■ Control inputs compatible with TTL level

■ Outputs source/sink up to 24 mA

■ Guaranteed simultaneous switching noise level and

dynamic threshold performance

■ Implements patented EMI reduction circuitry

■ Flexible V

CCB

operating range

■ Allows B Port and V

CCB

to float simultaneously when OE

is HIGH

■ Functionally compatible with the 74 series 245

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending su ffix let te r “X” to the ordering code.

Logic Symbol

Pin Descriptions

Connection Diagram

Order Number Package Number Package Description

74LVXC3245WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LVXC3245QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150” Wide
74LVXC3245MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

OE

Output Enable Input

T/R

Transmit/Receive Input

A

0–A7

Side A Inputs or 3-STATE Outputs

B

0–B7

Side B Inputs or 3-STATE Outputs

www.fairchildsemi.com 2

74LVXC3245

Truth Table

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial

Logic Diagram

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

3 www.fairchildsemi.com

74LVXC3245

Absolute Maximum Ratings(Note 1) Recommended Operating

Conditions

(Note 2)

Note 1: The “Absolute Maximum Ratings ” are those val ues beyond w hich
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 “Recommend ed O peratin g Cond itions” t able w ill defin e the condition s
for actual device operation.

Note 2: The A Port unused pins (inputs or I/Os) must be held HIGH or
LOW. They may not float.

DC Electrical Characteristics

Supply Voltage (V

CCA

, V

CCB

) −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 (I

OK

) Current ±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

DC Latch-Up Source or Sink Current ±300 mA

Supply Voltage

V

CCA

2.7V to 3.6V

V

CCB

3.0V 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) −40°C to +85°C
Minimum Input Edge Rate (∆V/∆t) 8 ns/V

V

IN

from 30% to 70% of V

CC

VCC @ 3.0V, 4.5V, 5.5V

Symbol Parameter

V

CCA

(V)

V

CCB

(V)

TA = 25°CTA = −40°C to +85°C

Units Conditions

Typ Guaranteed Limits

V

IHA

Minimum HIGH An, 2.7 3.0 2.0 2.0

V

V

OUT

≤ 0.1V
or
≥VCC − 0.1V

Level Input

OE

3.0 3.6 2.0 2.0

Voltage

T/R

3.6 5.5 2.0 2.0

V

IHB

B

n

2.7 3.0 2.0 2.0

3.0 3.6 2.0 2.0

3.6 5.5 3.85 3.85

V

ILA

Maximum LOW An, 2.7 3.0 0.8 0.8

V

V

OUT

≤ 0.1V
or
≥VCC − 0.1V

Level Input

OE

3.0 3.6 0.8 0.8

Voltage

T/R

3.6 5.5 0.8 0.8

V

ILB

B

n

2.7 3.0 0.8 0.8

3.0 3.6 0.8 0.8

3.6 5.5 1.65 1.65

V

OHA

Minimum HIGH Level 3.0 3.0 2.99 2.9 2.9

V

I

OUT

= −100 µA

Output Voltage 3.0 3.0 2.85 2.56 2.46 IOH = −12 mA

3.0 3.0 2.65 2.35 2.25 IOH = −24 mA

2.7 3.0 2.5 2.3 2.2 IOH = −12 mA

2.7 4.5 2.3 2.1 2.0 IOH = −24 mA

V

OHB

3.0 3.0 2.99 2.9 2.9

V

I

OUT

= −100 µA

3.0 3.0 2.85 2.56 2.46 IOH = −12 mA

3.0 3.0 2.65 2.35 2.25 IOH = −24 mA

3.0 4.5 4.25 3.86 3.76 IOH = −24 mA

V

OLA

Maximum LOW Level 3.0 3.0 0.002 0.1 0.1

V

I

OUT

= 100 µA

Output Voltage 3.0 3.0 0.21 0.36 0.44 IOL = 24 mA

2.7 3.0 0.11 0.36 0.44 IOL = 12 mA

2.7 4.5 0.22 0.42 0.5 IOL = 24 mA

V

OLB

3.0 3.0 0.002 0.1 0.1
V

I

OUT

= 100 µA

3.0 3.0 0.21 0.36 0.44 IOL = 24 mA

3.0 4.5 0.18 0.36 0.44 IOL = 24 mA

I

IN

Maximum Input 3.6 3.6 ±0.1 ±1.0

µA

VI = V

CCA

, GND
Leakage Current @ 3.6 5.5 ±0.1 ±1.0
OE, T/R