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74LCX16543 Low Voltage 16-Bit Registered Transceiver with 5V Tolerant Inputs and Outputs
May 1995
Revised April 2001
74LCX16543
Low Voltage 16-Bit Registered Transceiver
with 5V Tolerant Inputs and Outputs
General Description
The LCX16543 contains sixteen non-inverting transceivers
containing two sets of D-type registers for temporary stor-
age of data flowing in either direction. Each byte has sepa-
rate control inputs which can be shorted together for full
16-bit operation. Separate Latch Enable and Output
Enable inputs are provided for each register to permit inde-
pendent input and output control in either direction of data
flow.
The LCX16543 is designed for low voltage (2.5V or 3.3V)
V
CC
applications with capability of interfacing to a 5V signal
environment.
The LCX16543 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintaining
CMOS low power dissipation.
Features
s
5V tolerant inputs and outputs
s
2.3V–3.6V V
CC
specifications provided
s
5.2 ns t
PD
max (V
CC
=
3.3V), 20
µ
A I
CC
max
s
Power down high impedance inputs and outputs
s
Supports live insertion/withdrawal (Note 1)
s
±
24 mA Output Drive (V
CC
=
3.0V)
s
Implements patented noise/EMI reduction circuitry
s
Latch-up performance exceeds 500 mA
s
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:
Order Number
74LCX16543MEA
74LCX16543MTD
Package Number
MS56A
MTD56
Package Description
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
A-to-B data flow shown; B-to-A flow control is the same, except using CEBA
n
, LEBA
n
and OEBA
n
Functional Description
The LCX16543 contains sixteen non-inverting transceivers
with 3-STATE outputs. The device is byte controlled with
each byte functioning identically, but independent of the
other. The control pins may be shorted together to obtain
full 16-bit operation. The following description applies to
each byte. For data flow from A to B, for example, the
A-to-B Enable (CEAB
n
) input must be LOW in order to
enter data from A
0
–A
15
or take data from B
0
–B
15
, as indi-
cated in the Data I/O Control Table. With CEAB
n
LOW, a
LOW signal on the A-to-B Latch Enable (LEAB
n
) input
makes the A-to-B latches transparent; a subsequent LOW-
to-HIGH transition of the LEAB
n
signal puts the A latches in
the storage mode and their outputs no longer change with
the A inputs. With CEAB
n
and OEAB
n
both LOW, the
3-STATE B output buffers are active and reflect the data
present at the output of the A latches. Control of data flow
from B to A is similar, but using the CEBA
n
, LEBA
n
and
OEBA
n
inputs.
www.fairchildsemi.com
2
74LCX16543
Logic Diagrams
Byte 1 (0:7)
Byte 2 (8:15)
Please note that these diagrams are provided only for the understanding of logic operations and should not be used to estimate propagation delays.
3
www.fairchildsemi.com
74LCX16543
Absolute Maximum Ratings
(Note 2)
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Parameter
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
Value
Conditions
Units
V
V
Output in 3-STATE
Output in HIGH or LOW State (Note 3)
V
I
<
GND
V
O
<
GND
V
O
>
V
CC
V
mA
mA
mA
mA
mA
−
0.5 to
+
7.0
−
0.5 to
+
7.0
−
0.5 to
+
7.0
−
0.5 to V
CC
+
0.5
−
50
−
50
+
50
±
50
±
100
±
100
−
65 to
+
150
°
C
Recommended Operating Conditions
(Note 4)
Symbol
V
CC
V
I
V
O
I
OH
/I
OL
Supply Voltage
Input Voltage
Output Voltage
Output Current
HIGH or LOW State
3-STATE
V
CC
=
3.0V
−
3.6V
V
CC
=
2.7V
−
3.0V
V
CC
=
2.3V
−
2.7V
T
A
Free-Air Operating Temperature
Input Edge Rate, V
IN
=
0.8V–2.0V, V
CC
=
3.0V
Parameter
Operating
Data Retention
Min
2.0
1.5
0
0
0
Max
3.6
3.6
5.5
V
CC
5.5
Units
V
V
V
±
24
±
12
±
8
−
40
0
85
10
mA
°
C
ns/V
∆
t/
∆
V
Note 2:
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 the conditions for actual device operation.
Note 3:
I
O
Absolute Maximum Rating must be observed.
Note 4:
Unused (inputs or I/Os) must be held HIGH or LOW. They may not float.
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