August 1998
Revised April 1999
7
4LCXP
1
6245
L
o
w
V
o
lt
age 16-Bi
t Bidi
rect
ion
a
l T
r
ansc
eiver

wi
th 5V
T
o
l
e
rant

I
nput
s/Out
puts and Pull
-Down
Res
i
st
ors
© 1999 Fairchild Semiconductor Corporation DS500053.prf www.fairchildsemi.com
74LCXP16245
Low Voltage 16-Bit Bidirectional Transceiver with
5V Tolerant Inputs/Outputs and Pull-Down Resistors
General Description
The LCXP16245 contains sixteen non-inverting bidirec-
tional buffers with 3-STATE outputs and is intended for bus
oriented applications. The device is designed for low volt-
age (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 together for full 16-bit operation. The T/R
inputs determine the direction of data flow through the
device. The OE inputs disable both the A and B ports by
placing them in a high impedance state.
In addition, A and B port datapath pins have built-in resis-
tors to GND allowing the pins to float without any increase
in I
CC
current. This feature is intended to address modular
and space constrained applications where additional space
consumed by external resistors is not available.
The LCXP16245 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
Features
a73 5V tolerant inputs and outputs
a73 2.3V–3.6V V
CC
specifications provided
a73 I/O Pull-down resistors terminate inactive busses ensur-
ing a stable bus state
a73 5.5 ns t
PD
max (V
CC
= 3.3V), 20 µA I
CC
max
a73 Power down high impedance inputs and outputs
a73 Supports live insertion/withdrawal (Note 1)
a73 ±24 mA output drive (V
CC
= 3.0V)
a73 Implements patented noise/EMI reduction circuitry
a73 Pinout compatible with 74 series 16245
a73 Latch-up performance exceeds 500 mA
a73 ESD performance:
Human body model > 2000V
Machine model > 200V
Note 1: To ensure the high-impedance state during power up or down OE
should be tied to V
CC
through a pull-up resistor: the minimum value or the
resistor is determined by the current-sourcing capability of the driver.

Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol Pin Descriptions
Order Number Package Number Package Description
74LCXP16245MEA MS48A 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300” Wide
74LCXP16245MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Description
Names
OE
n
Output Enable Input
T/R
n
Transmit/Receive Input
A
0
–A
15
Side A Inputs or 3-STATE Outputs
B
0
–B
15
Side B Inputs or 3-STATE Outputs