Fairchild Semiconductor 74LCXR162245MTD, 74LCXR162245MEX, 74LCXR162245MEA, 74LCXR162245CW Datasheet

August 1998
Revised April 1999

74LCXR162245 Low Voltage 16-Bit Bidirectional Transceiver with 5V Tolerant Inputs/Outputs and 26Ω Series

Resistors in the Outputs

© 1999 Fairchild Semiconductor Corporation DS500052.prf www.fairchildsemi.com

74LCXR162245
Low Voltage 16-Bit Bidirectional Transceiver with 5V

Tolerant Inputs/Outputs and 26Ω Series Resistors in the
Outputs

General Description

The LCXR162245 contains sixteen non-inverting bidire c­tional buffers with 3-STATE outputs and is intended for bus
oriented application s. The device is de signed for low vo lt­age (2.5V or 3.3V) V

CC

applications with capability of inter-

facing to a 5V signal environment. The device is byte
controlled. Each byte has separate control inputs which
could be shorted toge ther fo r ful l 16-bi t op eration . The T /R
inputs determine the direction of data flow through the
device. The OE

inputs disable bo th the A and B ports by

placing them in a high impedance state.
In addition, all A and B outputs include equivalent 26Ω

(nominal) series resistor s to reduce overshoot and under­shoot and are designed to sink/source up to 12 mA at
V

CC

= 3.0V.

The LCXR162245 is fa bricated with an advanced CMOS
technology to achieve high speed operation while maintain­ing CMOS low power dissipation.

Features

■ 5V tolerant inputs and outputs

■ 2.3V–3.6V V

CC

specifications provided

■ A and B side outputs have equivalent 26Ω series
resistors

■ 5.3 ns t

PD

max (VCC = 3.3V), 20 µA ICC max

■ Power down high impedance inputs and outputs

■ Supports live insertion/withdrawal (Note 1)

■ Flow through pinout

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exceeds 500 mA

■ ESD performance:

Human body model > 2000V
Machine model > 200V

Note 1: To ensure the high-impedance state d uring pow er up or d own 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-sourcing capability of the dr iv er.

Ordering Code:

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

Logic Symbol Pin Descriptions

Order Number Package Number Package Description

74LCXR162245MEA MS48A 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300” Wide
74LCXR162245MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Pin Names Description

OE

n

Output Enable Input

T/R

n

Transmit/Receive Input

A

0–A15

Side A Inputs or 3-STATE Outputs

B

0–B15

Side B Inputs or 3-STATE Outputs

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74LCXR162245

Connection Diagram Tr uth Tables

Note 2: A and B port inputs are still activ e

Logic Diagram

Inputs Outputs

OE

1

T/R

1

L L Bus B0–B7 Data to Bus A0–A

7

L H Bus A0–A7 Data to Bus B0–B

7

H X HIGH Z State on A0–A7, B0–B7 (Note 2)

Inputs Outputs

OE

2

T/R

2

L L Bus B8–B15 Data to Bus A8–A

15

L H Bus A8–A15 Data to Bus B8–B

15

H X HIGH Z State on A8–A15, B8–B

15

(Note 2)

3 www.fairchildsemi.com

74LCXR162245

Absolute Maximum Ratings(Note 3)

Recommended Operating Conditions (Note 5)

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 “Recom­mended Operating C onditions” table will def ine the conditions for act ual device operation.

Note 4: I

O

Absolute Maximum Rating must be observed.

Note 5: Unused pins (Inputs or I/O's) must be held HIGH or LOW. They may not Float.

DC Electrical Characteristics

Symbol Parameter Value Conditions Units

V

CC

Supply Voltage −0.5 to +7.0 V

V

I

DC Input Voltage −0.5 to +7.0 V

V

O

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

V

−0.5 to V

CC

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

I

IK

DC Input Diode Current −50 VI < GND mA

I

OK

DC Output Diode Current −50 VO < GND

mA

+50 V

O

> V

CC

I

O

DC Output Source/Sink Current ±50 mA

I

CC

DC Supply Current per Supply Pin ±100 mA

I

GND

DC Ground Cu rrent per Ground Pin ±100 mA

T

STG

Storage Temperature −65 to +150 °C

Symbol Parameter Min Max Units

V

CC

Supply Voltage Operating 2.0 3.6

V

Data Retention 1.5 3.6

V

I

Input Voltage 0 5.5 V

V

O

Output Voltage HIGH or LOW State 0 V

CC

V

3-STATE 0 5.5

I

OH/IOL

Output Current VCC = 3.0V − 3.6V ±12

mA V

CC

= 2.7V − 3.0V ±8

V

CC

= 2.3V − 2.7V ±4

T

A

Free-Air Operating Temperature −40 85 °C

∆t/∆V Input Edge Rate, V

IN

= 0.8V–2.0V, VCC = 3.0V 0 10 ns/V

Symbol Parameter Conditions

VCC

(V)

TA = −40°C to +85°C

Units

Min Max

V

IH

HIGH Level Input Voltage 2.3 − 2.7 1.7

V

2.7 − 3.6 2.0

V

IL

LOW Level Input Voltage 2.3 − 2.7 0.7

V

2.7 − 3.6 0.8

V

OH

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

V

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

V

OL

LOW Level Output Voltage IOL = 100 µA 2.3 − 3.6 0.2

V

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

I

I

Input Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA