May 1995
Revised April 1999
7
4LCX16543 Low
V
o
lt
age 16-Bi
t Regist
ere
d
T
r
anscei
ver wit
h
5V T
o
ler
ant In
puts and O
u
t
put
s
1999 Fairchild Semiconductor Corporation
DS012464.prf
www.fairchildsemi.com
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
2.3V3.6V V
CC
specifications provided
s
5.2 ns t
PD
max (V
CC
=
3.3V), 20
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:
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagram
Logic Symbol
Order Number
Package Number
Package Description
74LCX16543MEA
MS56A
56-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" Wide
74LCX16543MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
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2
74LCX16543
Pin Descriptions
Data I/O Control Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
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 indicated in
the Data I/O Control Table. With CEAB
n
LOW, a LOW sig-
nal on the A-to-B Latch Enable (LEAB
n
) input makes the A-
to-B latches transparent; a subsequent LOW-to-HIGH tran-
sition 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.
Pin Names
Description
OEAB
n
A-to-B Output Enable Input (Active LOW)
OEBA
n
B-to-A Output Enable Input (Active LOW)
CEAB
n
A-to-B Enable Input (Active LOW)
CEBA
n
B-to-A Enable Input (Active LOW)
LEAB
n
A-to-B Latch Enable Input (Active LOW)
LEBA
n
B-to-A Latch Enable Input (Active LOW)
A
0
A
15
A-to-B Data Inputs or B-to-A 3-STATE Outputs
B
0
B
15
B-to-A Data Inputs or A-to-B 3-STATE Outputs
Inputs
Latch
Status
Output
Buffers
CEAB
n
LEAB
n
OEAB
n
(Byte n)
(Byte n)
H
X
X
Latched
High Z
X
H
X
Latched
--
L
L
X
Transparent
--
X
X
H
--
High Z
L
X
L
--
Driving
3
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7
4LCX16543
Logic Diagrams
Byte 1 (0:7)
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Byte 2 (8:15)
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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4
74LCX16543
Absolute Maximum Ratings
(Note 2)
Recommended Operating Conditions
(Note 4)
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.
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 3)
I
IK
DC Input Diode Current
-
50
V
I
<
GND
mA
I
OK
DC Output Diode Current
-
50
V
O
<
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 Current 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
/I
OL
Output Current
V
CC
=
3.0V
-
3.6V
24
mA
V
CC
=
2.7V
-
3.0V
12
V
CC
=
2.3V
-
2.7V
8
T
A
Free-Air Operating Temperature
-
40
85
C
t/
V
Input Edge Rate, V
IN
=
0.8V2.0V, V
CC
=
3.0V
0
10
ns/V
Symbol
Parameter
Conditions
V
CC
(V)
T
A
=
-
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
I
OH
=
-
100
A
2.3
-
3.6
V
CC
-
0.2
V
I
OH
=
-
8 mA
2.3
1.8
I
OH
=
-
12 mA
2.7
2.2
I
OH
=
-
18 mA
3.0
2.4
I
OH
=
-
24 mA
3.0
2.2
V
OL
LOW Level Output Voltage
I
OL
=
100
A
2.3
-
3.6
0.2
V
I
OL
=
8 mA
2.3
0.6
I
OL
=
12 mA
2.7
0.4
I
OL
=
16 mA
3.0
0.4
I
OL
=
24 mA
3.0
0.55
I
I
Input Leakage Current
0
V
I
5.5V
2.3
-
3.6
5.0
A
I
OZ
3-STATE I/O Leakage
0
V
O
5.5V
2.3
-
3.6
5.0
A
V
I
=
V
IH
or V
IL
I
OFF
Power-Off Leakage Current
V
I
or V
O
=
5.5V
0
10
A
5
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7
4LCX16543
DC Electrical Characteristics
(Continued)
Note 5: Outputs in disabled or 3-STATE only.
AC Electrical Characteristics
Note 6: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
). Parameter guaranteed by design.
Dynamic Switching Characteristics
Capacitance
Symbol
Parameter
Conditions
V
CC
(V)
T
A
=
-
40
C to
+
85
C
Units
Min
Max
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.3
-
3.6
20
A
3.6V
V
I
, V
O
5.5V (Note 5)
2.3
-
3.6
20
I
CC
Increase in I
CC
per Input
V
IH
=
V
CC
-
0.6V
2.3
-
3.6
500
A
Symbol
Parameter
T
A
=
-
40
C to
+
85
C, R
L
=
500
Units
V
CC
=
3.3V
0.3V
V
CC
=
2.7V
V
CC
=
2.5V
0.2V
C
L
=
50 pF
C
L
=
50 pF
C
L
=
30 pF
Min
Max
Min
Max
Min
Max
t
PHL
Propagation Delay
1.5
5.2
1.5
6.0
1.5
6.2
ns
t
PLH
A
n
to B
n
or B
n
to A
n
1.5
5.2
1.5
6.0
1.5
6.2
t
PHL
Propagation Delay
1.5
6.5
1.5
7.5
1.5
7.8
ns
t
PLH
LEBA
n
to A
n
or LEAB
n
to B
n
1.5
6.5
1.5
7.5
1.5
7.8
t
PZL
Output Enable Time
t
PZH
OEBA
n
or OEAB
n
to A
n
or B
n
1.5
6.5
1.5
7.0
1.5
8.5
ns
CEBA
n
or CEAB
n
to A
n
or B
n
1.5
6.5
1.5
7.0
1.5
8.5
t
PLZ
Output Disable Time
t
PHZ
OEBA
n
or OEAB
n
to A
n
or B
n
1.5
6.5
1.5
7.0
1.5
7.8
ns
CEBA
n
or CEAB
n
to A
n
or B
n
1.5
6.5
1.5
7.0
1.5
7.8
t
S
Setup Time, HIGH or LOW,
2.5
2.5
3.0
ns
Data to LEXX
n
t
H
Hold Time, HIGH or LOW,
1.5
1.5
2.0
ns
Data to LEXX
n
t
W
Pulse Width, Latch Enable, LOW
3.0
3.0
3.5
ns
t
OSHL
Output to Output Skew (Note 6)
1.0
ns
t
OSLH
1.0
Symbol
Parameter
Conditions
V
CC
(V)
T
A
=
25
C
Units
Typical
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
0.8
V
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
0.6
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
3.3
-
0.8
V
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
2.5
-
0.6
Symbol
Parameter
Conditions
Typical
Units
C
IN
Input Capacitance
V
CC
=
Open, V
I
=
0V or V
CC
7
pF
C
I/O
Input/Output Capacitance
V
CC
=
3.3V, V
I
=
0V or V
CC
8
pF
C
PD
Power Dissipation Capacitance
V
CC
=
3.3V, V
I
=
0V or V
CC
, f
=
10 MHz
20
pF
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