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.
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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
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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.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −8
mA
I
OH
= −12
mA
I
OH
= −18
mA
I
OH
= −24
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
8 mA
I
OL
=
12 mA
I
OL
=
16 mA
I
OL
=
24 mA
I
I
I
OZ
I
OFF
Input Leakage Current
3-STATE I/O Leakage
Power-Off Leakage Current
0
≤
V
I
≤
5.5V
0
≤
V
O
≤
5.5V
V
I
=
V
IH
or V
IL
V
I
or V
O
=
5.5V
Conditions
V
CC
(V)
2.3
−
2.7
2.7
−
3.6
2.3
−
2.7
2.7
−
3.6
2.3
−
3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
2.3
−
3.6
0
V
CC
−
0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5.0
±5.0
10
µA
µA
µA
V
V
T
A
= −40°C
to
+85°C
Min
1.7
2.0
0.7
0.8
Max
Units
V
V
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4
74LCX16543
DC Electrical Characteristics
Symbol
I
CC
∆I
CC
Parameter
Quiescent Supply Current
Increase in I
CC
per Input
(Continued)
V
CC
(V)
2.3
−
3.6
2.3
−
3.6
2.3
−
3.6
T
A
= −40°C
to
+85°C
Min
Max
20
±20
500
µA
µA
Conditions
V
I
=
V
CC
or GND
3.6V
≤
V
I
, V
O
≤
5.5V (Note 5)
V
IH
=
V
CC
−0.6V
Units
Note 5:
Outputs in disabled or 3-STATE only.
AC Electrical Characteristics
T
A
= −40°C
to
+85°C,
R
L
=
500
Ω
Symbol
Parameter
V
CC
=
3.3V
±
0.3V
C
L
=
50 pF
Min
t
PHL
t
PLH
t
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
S
t
H
t
W
t
OSHL
t
OSLH
Propagation Delay
A
n
to B
n
or B
n
to A
n
Propagation Delay
LEBA
n
to A
n
or LEAB
n
to B
n
Output Enable Time
OEBA
n
or OEAB
n
to A
n
or B
n
CEBA
n
or CEAB
n
to A
n
or B
n
Output Disable Time
OEBA
n
or OEAB
n
to A
n
or B
n
CEBA
n
or CEAB
n
to A
n
or B
n
Setup Time, HIGH or LOW,
Data to LEXX
n
Hold Time, HIGH or LOW,
Data to LEXX
n
Pulse Width, Latch Enable, LOW
Output to Output Skew (Note 6)
3.0
1.0
1.0
3.0
3.5
1.5
1.5
2.0
1.5
1.5
2.5
6.5
6.5
1.5
1.5
2.5
7.0
7.0
1.5
1.5
3.0
7.8
7.8
ns
ns
ns
ns
ns
1.5
1.5
6.5
6.5
1.5
1.5
7.0
7.0
1.5
1.5
8.5
8.5
ns
1.5
1.5
1.5
1.5
Max
5.2
5.2
6.5
6.5
V
CC
=
2.7V
C
L
=
50 pF
Min
1.5
1.5
1.5
1.5
Max
6.0
6.0
7.5
7.5
V
CC
=
2.5V
±
0.2V
C
L
=
30 pF
Min
1.5
1.5
1.5
1.5
Max
6.2
6.2
7.8
7.8
ns
ns
Units
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
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