Fairchild 74LCXR162245 service manual

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74LCXR162245
Low Voltage 16-Bit Bidirectional Transceiver

with 5V Tolerant Inputs/Outputs
and 26: Series Resistors in the Outputs

August 1998
Revised June 2005

Resistors in the Outputs

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

General Description

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

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-bit op eration . The T /R
inputs determine the direction of data flow through the
device. The OE
placing them in a high impedance state.

In addition, all A and B outputs include equivalent 26
(nominal) series resistor s to reduce overshoot and unde r­shoot and are designed to sink/source up to 12 mA at
V

3.0V.

CC

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

applications with capability of inter-

CC

inputs disable both the A and B por ts by

Features

■ 5V tolerant inputs and outputs

■ 2.3V–3.6V V

■ A and B side outputs have equivalent 26

resistors

■ 5.3 ns t

■ 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 exce eds 500 mA

■ ESD performance:

Human body model ! 2000V
Machine model

Note 1: To ensure the high-impedance state d uring p ower 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 determined by the current-sourcing capability of the driver.

specifications provided

CC

max (VCC 3.3V), 20 PA ICC max

PD

!

200V

:

series

Ordering Code:

Order Number Package Number Package Description

74LCXR162245MEA MS48A 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" Wide

74LCXR162245MEX 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

74LCXR162245MTX MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Devices also availab l e in Tape and Reel. Specify by appending the suffix let t er “x” to the ordering code.

[RAIL]

[TAPE and REEL]

[RAIL]

[TAPE and REEL]

Logic Symbol Pin Descriptions

Pin Names Description

OE

n

T/R

n

A

0–A15

B

0–B15

© 2005 Fairchild Semiconductor Corporation DS500052 www.fairchildsemi.com

Print form created on June 10, 2005 12:56 pm

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

Connection Diagram Truth Tables

Inputs Outputs

OE

T/R

1

L L Bus B0–B7 Data to Bus A0–A

74LCXR162245

L H Bus A0–A7 Data to Bus B0–B
H X HIGH Z State on A0–A7, B0–B7 (Note 2)

Inputs Outputs

OE

T/R

2

L L Bus B8–B15 Data to Bus A8–A
L H Bus A8–A15 Data to Bus B8–B
H X HIGH Z State on A8–A15, B8–B

Note 2: A and B port inputs are s t ill ac t iv e

1

7

7

2

15

15

(Note 2)

15

Logic Diagram

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Absolute Maximum Ratings(Note 3)

Symbol Parameter Value Conditions Units

V
V
V

I
I

I
I
I
T

IK
OK

O
CC
GND

Supply Voltage 0.5 to 7.0 V

CC

DC Input Voltage 0.5 to 7.0 V

I

DC Output Voltage 0.5 to 7.0 Output in 3-STATE

O



0.5 to VCC  0.5 Output in HIGH or LOW State (Note 4)
DC Input Diode Current 50 VI  GND mA
DC Output Diode Current 50 VO  GND



50 VO ! V

CC

DC Output Source/Sink Current r50 mA
DC Supply Current per Supply Pin r100 mA
DC Ground Cu rrent per Ground Pin r100 mA
Storage T emperature 65 to 150 qC

STG

mA

Recommended Operating Conditions (Note 5)

Symbol Parameter Min Max Units

V

V
V

I

OH/IOL

T

't/'

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 para metric va lues defined in the Elec trical Cha racteristic s tables are n ot guarantee d at the A bsolute Ma ximum R atings . The “Recom-
mended Operating Conditions” table will define the conditions f or ac t ual device operation.

Note 4: I
Note 5: Unused pins (Inputs or I/O's ) m us t be held HIGH or LOW. They may not Float.

Supply Voltage Operating 2.0 3.6

CC

Data Retention 1.5 3.6

Input Voltage 0 5.5 V

I

Output Voltage HIGH or LOW State 0 V

O

CC

3-STATE 0 5.5

Output Current VCC 3.0V  3.6V r12

2.7V  3.0V r8

CC

V

2.3V  2.7V

Free-Air Operating Temperature 40 85 qC

A

CC

r

4

V Input Edge Rate, VIN 0.8V–2.0V, VCC 3.0V 0 10 ns/V

Absolute Maximum Rating must be observed.

O

mA V

74LCXR162245

V

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 PA 2.3

LOW Level Output Voltage IOL 100 PA 2.3

Input Leakage Current 0 d VI d 5.5V 2.3  3.6
3-STATE I/O Leakage 0 d VO d 5.5V 2.3  3.6

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

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

VI VIH or V

IL

V

T

CC

(V) Min Max

2.7  3.6 2.0

2.7  3.6 0.8



3.6 VCC  0.2



3.6 0.2

40qC to 85qC

A

Units

V

V

V

V

r

5.0

r

5.0

P

A

P

A

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