Fairchild Semiconductor 74LVXC4245QSCX, 74LVXC4245QSC, 74LVXC4245MTCX, 74LVXC4245MTC, 74LVXC4245WMX Datasheet

February 1994
Revised July 1999

74LVXC4245
8-Bit Dual Supply Configurable Voltage Interface

Transceiver with 3-STATE Outputs

74LVXC4245 8-Bit Dual Supply Configurable Voltage Interface Transceiver with 3-STATE Outputs

General Description

The LVXC4245 is a 24-pin dual-su pply, 8-bit configurable
voltage interface transc eiver suited for PCMCIA a nd other
real time configurable I/O applications. The V

accepts a 5V supply level. The “ A” Port is a dedicated 5V
port. The V

“B” Port is configured to track the V
respectively. A 5V level on the V
I/O pins at a 5V level and a 3 V V
pins at a 3V level. This device will allow the V
source pin and I/O pins on the “B” Port to float when OE

HIGH. This feature is necessary to buffer data to and from
a PCMCIA socket that permits PCMCIA cards to be
inserted and removed during normal operation.

pin accepts a 3V-to-5V supply level. The

CCB

pin will configure the

CC

will configure the I/O

CC

supply level

CCB

CCB

CCA

voltage

Features

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

■ Control inputs compatible with TTL level

pin

■ Outputs source/sink up to 24 mA

■ Guaranteed simultaneous switching noise level and

dynamic threshold performance

■ Implements patented EMI reduction circuitry

■ Flexible V

■ Allows B Port and V

is HIGH

is

■ Functionally compatible with the 74 series 245

operating range

CCB

CCB

to float simultaneously when OE

Ordering Code:

Order Number Package Number Package Description

74LVXC4245WM M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LVXC4245QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150” Wide
74LVXC4245MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.

Logic Symbol

Connection Diagram

Pin Descriptions

Pin Names Description

OE
T/R

A

0–A7

B

0–B7

© 1999 Fairchild Semiconductor Corporation DS012009 www.fairchildsemi.com

Output Enable Input
Transmit/Receive Input

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

Truth Table

74LVXC4245

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

Logic Diagram

Inputs Outputs

OE

L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH-Z State

T/R

www.fairchildsemi.com 2

Absolute Maximum Ratings(Note 1) Recommended Operating

Supply Voltage (V

CCA,VCCB

DC Input Voltage (V
DC Input/Output Voltage (V

@ A

n

@ B

n

DC Input Diode Current (I

, T/R ±20 mA

@ OE

DC Output Diode Current (I

) −0.5V to +7.0V

) @ OE, T/R −0.5V to V

I

)

I/O

−0.5V to V

−0.5V to V

)

IK

) ±50 mA

OK

CCA

CCA
CCB

DC Output Source or

Sink Current (I

or Ground Current

DC V

CC

Per Output Pin (I

) ±50 mA

O

or I

CC

) ±50 mA

GND

and Max Current ±200 mA

Storage Temperature Range (T

) −65°C to +150°C

STG

DC Latch-Up Source or

Sink Current ±300 mA

Conditions

+0.5V

+0.5V
+0.5V

Supply Voltage V

V

CCB

Input Voltage (V
Input/Output Voltage (V

@A

n

@B

n

Free Air Operating Temperature (TA) −40°C to +85°C
Minimum Input Edge Rate (∆V/∆t) 8 ns/V

from 30% to 70% of V

V

IN

VCC @ 3V, 4.5V, 5.5V

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 condit ions
for actual device operation.

Note 2: The A Port unused pins (inputs and I/O's) must b e held HIGH or
LOW. They may not float.

(Note 2)

CCA

) @ OE, T/R 0V to V

I

)

I/O

CC

DC Electrical Characteristics

Symbol Parameter

V

Minimum HIGH Level A

IHA

Input Voltage

V

IHB

V

Maximum LOW Level A

ILA

Input Voltage

V

ILB

V

Minimum HIGH Level 4.5 3.0 4.49 4.4 4.4

OHA

Output Voltage 4.5 3.0 4.25 3.86 3.76 IOH = −24 mA

V

OHB

V

Maximum LOW Level 4.5 3.0 0.002 0.1 0.1

OLA

Output Voltage 4.5 3.0 0.21 0.36 0.44 IOL = 24 mA

V

OLB

I

Maximum Input VI = V

IN

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

OE
T/R

B

OE
T/R

B

V

V

CCA

(V)

4.5 2.7 2.0 2.0

n

4.5 3.6 2.0 2.0 or

5.5 5.5 2.0 2.0 ≥ VCC − 0.1V

4.5 2.7 2.0 2.0

n

4.5 3.6 2.0 2.0

4.5 5.5 3.85 3.85

4.5 2.7 0.8 0.8

n

4.5 3.6 0.8 0.8 or

5.5 5.5 0.8 0.8 ≥ VCC − 0.1V

4.5 2.7 0.8 0.8

n

4.5 3.6 0.8 0.8

4.5 5.5 1.65 1.65

4.5 3.0 2.99 2.9 2.9

4.5 3.0 2.85 2.56 2.46 IOH = −12 mA

4.5 3.0 2.65 2.35 2.25 IOH = −24 mA

4.5 2.7 2.5 2.3 2.2 IOH = −12 mA

4.5 2.7 2.3 2.1 2.0 IOH = −24 mA

4.5 4.5 4.25 3.86 3.76 IOH = −24 mA

4.5 3.0 0.002 0.1 0.1

4.5 3.0 0.21 0.36 0.44 IOL = 24 mA

4.5 2.7 0.11 0.36 0.44 IOL = 12 mA

4.5 2.7 0.22 0.42 0.5 IOL = 24 mA

4.5 4.5 0.18 0.36 0.44 IOL = 24 mA

5.5 5.5 ±0.1 ±1.0

CCB

(V)

TA = +25°CTA = −40°C to +85°C

Typ Guaranteed Limits

Units Conditions

V

V

V

V

I

V

I

V

I

V

I

V

OUT

OUT

= −100 µA

OUT

= −100 µA

OUT

= 100 µA

OUT

= 100 µA

OUT

4.5V to 5.5V

2.7V to 5.5V

0V to V
0V to V

≤ 0.1V

≤ 0.1V

, GND

CCA

74LVXC4245

CCA

CCA
CCB

3 www.fairchildsemi.com