Fairchild Semiconductor 74LCX32245 Datasheet

74LCX32245
Low Voltage 32-Bit Bidirectional Trans ceiver

with 5V Tolerant Inputs and Outputs

74LCX32245 Low Voltage 32-Bit Bidirectional Transceiver with 5V T olerant Inputs and Outputs

November 2001
Revised June 2002

General Description

The LCX32245 contains thirty-two non-inverting bidirec­tional 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

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 32-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.

The LCX32245 is fabricated with an advanced CMOS tech­nology to achieve high s peed operation while maintaining
CMOS low power dissipation.

applications with capability of inter-

CC

inputs disable bo th the A and B ports by

Features

■ 5V tolerant inputs and outputs

■ 2.3V–3.6V V

■ 4.5 ns t

■ Power down high impedance inputs and outputs

■ Supports live insertion/withdrawal (Note 1)

■

±24 mA output drive (V

■ Uses patented noise/EMI reductio n circuitr y

■ Latch-up performance exce eds 500 mA

■ ESD performance:

Human body model
Machine model

■ Packaged in plastic Fine-Pitch Ball Grid Array (FBGA)

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 (VCC = 3.3V), 20 µA ICC max

PD

> 200V

Ordering Code:

Order Number Package Number Package Description

74LCX32245G
(Note 2)(Note 3)

Note 2: Ordering code “G” indicates Trays.
Note 3: Devices also available in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

BGA96A 96-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide

Logic Symbol

= 3.0V)

CC

> 2000V

© 2002 Fairchild Semiconductor Corporation DS500428 www.fairchildsemi.com

Connection Diagram

74LCX32245

(Top Thru View)

Pin Descriptions

Pin Names Descriptio n

OE
T/R
A
B

n

n
0–A31
0–B31

Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs

FBGA Pin Assignments

123456

A B
B B
C B
D B
E B
F B11B10V
G B13B12GND GND A12A

H B14B15T/R2OE2A
J B

K B19B18GND GND A18A
L B
M B23B22GND GND A22A
N B25B24GND GND A24A
P B
R B29B28GND GND A28A

T B

B0T/R1OE1A

1

B2GND GND A2A

3

B4V

5
7
9

17B16

21B20VCCVCCA20A21

27B26VCCVCCA26A27

30B31

CCVCCA4

B6GND GND A6A
B8GND GND A8A

CCVCCA10A11

T/R3OE3A

T/R4OE4A

A

0

A

15A14
16A17

31A30

1
3
5
7
9

13

19

23
25

29

Truth Tables

Inputs

OE

T/R

1

1

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–B

Inputs

OE

T/R

3

3

L L Bus B16–B23 Data to Bus A16–A
L H Bus A16–A23 Data to Bus B16–B
H X HIGH Z State on A16–A23, B16–B

H = HIGH Voltage Level
L = LOW Voltage Level

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Outputs

7
7

7

Outputs

23
23

23

Inputs

OE

T/R

2

2

LLBus B

Outputs

Data to Bus A8–A

8–B15

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

OE

Inputs

4

T/R

4

Outputs

L L Bus B24–B31 Data to Bus A24–A
L H Bus A24–A31 Data to Bus B24–B

H X HIGH Z State on A24–A31, B24–B

X = Immaterial (HIGH or LOW, inputs and I/O’s may not float)
Z = High Impedance

15
15

15

31
31

31

Logic Diagrams

74LCX32245

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