Fairchild Semiconductor 74LCXR2245 Datasheet

74LCXR2245
Low Voltage Bidirectional Transceiver with

5V Tolerant Inputs and Outputs and
26

Ω Series Resistors on Both A and B Ports

October 2000
Revised October 2000

Resistors on Both A and B Ports

74LCXR2245 Low Voltage Bidirectional Transceiver with 5V Tolerant Inputs and Outputs and 26

General Description

The LCXR2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is in tended for bus ori­ented applications. The device is designed fo r low voltage
(2.5V and 3.3V) V

ing to a 5V signal en vironment. The T /R
the direction of d ata flo w t hro ugh t he de vi ce. T he O E
disables both the A and B ports by placing them in a high
impedance state. The 26
output overshoot and undershoot.

The LCXR2245 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain­ing CMOS low power dissipation.

applications with capability of interfac-

CC

Ω series resistor helps reduce

input determines

input

Features

■ 5V tolerant inputs and outputs

■ 2.3V–3.6V V

■ 8.0 ns t

■ Power down high impedance inputs and outputs

■ Supports live insertion/withdrawal (Note 1)

■

±12 mA output drive (V

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exce eds 500 mA

■ Equivalent 26

■ ESD performance:

Human body model
Machine model

Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to VCC through a pull-up res istor: the m inimu m value or t he

resistor is determin ed by the current-sourc ing capability of the driver.

specifications provided

CC

max (V

PD

= 3.3V), 10 µA I

CC

= 3.0V)

CC

Ω series resistor on all outputs

> 2000V

> 200V

max

CC

Ordering Code:

Order Number Package Number Package Description

74LCXR2245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LCXR2245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCXR2245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCXR2245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

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

Logic Symbol

Connection Diagram

Pin Descriptions

Pin Names Description

OE
T/R
A

0–A7

B

0–B7

© 2000 Fairchild Semiconductor Corporation DS500361 www.fairchildsemi.com

Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs

Ω

Series

Truth Table

Inputs

74LCXR2245

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

Note 2: Unused bus termina ls during HIGH Z State must be held HIGH or LO W.

OE

T/R

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 (Note 2)

Logic Diagram

Outputs

7

7

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Absolute Maximum Ratings(Note 3)

Symbol Parameter Value Conditions Units

V
V
V

I
I

I
I
I
T

CC
I
O

IK
OK

O
CC
GND

STG

Supply Voltage −0.5 to +7.0 V
DC Input Voltage −0.5 to +7.0 V
DC Output Voltage −0.5 to +7.0 Output in 3-STATE

−0.5 to V

+ 0.5 Output in HIGH or LOW State (Note 4)

CC

DC Input Diode Current −50 VI < GND mA
DC Output Diode Current −50 VO < GND

+50 V

O

> V

CC

DC Output Source/Sink Current ±50 mA
DC Supply Current per Supply Pin ±100 mA
DC Ground Current per Ground Pin ±100 mA
Storage Temperature −65 to +150 °C

Recommended Operating Conditions (Note 5)

Symbol Parameter Min Max Units

V

CC

V

I

V

O

I

OH/IOL

T

A

∆t/∆V Input Edge Rate, V

Note 3: 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 “Recom-
mended Operating Conditions” table will define th e c onditions for actual dev ic e operation.

Note 4: I
Note 5: Unused inputs or I/O pins m us t be held HIGH or LOW. They may not float.

Supply Voltage Operating 2.0 3.6

Data Retention 1.5 3.6
Input Voltage 05.5V
Output Voltage HIGH or LOW State 0 V

CC

3-STATE 0 5.5

Output Current VCC = 3.0V − 3.6V ±12

= 2.7V - 3.0V ±8

CC

V

= 2.3V - 2.7V ±4

CC

mAV

Free-Air Operating T emperature −40 85 °C

= 0.8V − 2.0V, VCC = 3.0V 0 10 ns/V

IN

Absolute Maximum Rating must be observed.

O

74LCXR2245

V

mA

V

V

DC Electrical Characteristics

Symbol Parameter Conditions

V

IH

V

IL

V

OH

V

OL

I

I

I

OZ

HIGH Level Input Voltage 2.3 − 2.7 1.7

LOW Level Input Voltage 2.3 − 2.7 0.7

HIGH Level Output Voltage IOH = −100 µA 2.3 - 3.6 VCC − 0.2

IOH = −4 mA 2.3 1.8
IOH = −4 mA 2.7 2.2
IOH = −6 mA 3.0 2.4
IOH = −8 mA 2.7 2.0
IOH = −12 mA 3.0 2.0

LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2

IOL = 4 mA 2.3 0.6
IOL = 4 mA 2.7 0.4
IOL = 6 mA 3.0 0.55
IOL = 8 mA 2.7 0.6

IOL = 12 mA 3.0 0.8
Input Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA
3-STATE I/O Leakage 0 ≤ VO ≤ 5.5V

VI = VIH or V

V

CC

(V) Min Max

2.7 − 3.6 2.0

2.7 - 3.6 0.8

IL

2.3 − 3.6 ±5.0 µA

TA = −40°C to +85°C

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Units

V

V

V

V