Preliminary
© 2001 Fairchild Semiconductor Corporation
DS500547
www.fairchildsemi.com
January 2001
Revised August 2001
7
4
LCX32373 Low
V
o
lt
age 32-Bi
t T
r
ans
p
arent
Lat
c
h w
i
th
5V T
o
ler
a
nt Inpu
ts and
Out
puts (
P
r
e
li
minar
y
)
74LCX32373
Low Voltage 32-Bit Transparent Latch
with 5V Tolerant Inputs and Outputs (Preliminary)
General Description
The LCX32373 contains thirty-two non-inverting latches
with 3-STATE outputs and is intended for bus oriented
applications. The device is byte controlled. The flip-flops
appear transparent to the data when the Latch Enable (LE)
is HIGH. When LE is LOW, the data that meets the setup
time is latched. Data appears on the bus when the Output
Enable (OE) is LOW. When OE is HIGH, the outputs are in
a high impedance state.
The LCX32373 is designed for low voltage (2.5V or 3.3V)
V
CC
applications with capability of interfacing to a 5V signal
environment.
The LCX32373 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintaining
CMOS low power dissipation.
Features
I
5V tolerant inputs and outputs
I
2.3V3.6V V
CC
specifications provided
I
5.4 ns t
PD
max (V
CC
=
3.3V), 20
µ
A I
CC
max
I
Power down high impedance inputs and outputs
I
Supports live insertion/withdrawal (Note 1)
I ±
24 mA output drive (V
CC
=
3.0V)
I
Uses patented noise/EMI reduction circuitry
I
Latch-up performance exceeds 500 mA
I
ESD performance:
Human body model
>
2000V
Machine model
>
200V
I
Packaged in plastic Fine-Pitch Ball Grid Array (FBGA)
(Preliminary)
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:
Note 2: BGA package available in Tape and Reel only.
Logic Symbol
Order Number
Package Number
Package Description
74LCX32373GX
(Note 2)
BGA96A
(Preliminary)
96-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
[TAPE and REEL]
Preliminary
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2
74LCX32373
Connection Diagram
(Top Thru View)
Pin Descriptions
FBGA Pin Assignments
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
O
0
=
Previous O
0
before HIGH-to-LOW transition of Latch Enable
Functional Description
The LCX32373 contains thirty-two D-type latches with
3-STATE standard outputs. The device is byte controlled
with each byte functioning identically, but independent of
the other. Control pins can be shorted together to obtain full
32-bit operation. The following description applies to each
byte. When the Latch Enable (LE
n
) input is HIGH, data on
the I
n
enters the latches. In this condition the latches are
transparent, i.e. a latch output will change state each time
its I input changes. When LE
n
is LOW, the latches store
information that was present on the I inputs a setup time
preceding the HIGH-to-LOW transition of LE
n
. The
3-STATE standard outputs are controlled by the Output
Enable (OE
n
) input. When OE
n
is LOW, the standard out-
puts are in the 2-state mode. When OE
n
is HIGH, the stan-
dard outputs are in the high impedance mode but this does
not interfere with entering new data into the latches.
Pin Names
Description
OE
n
Output Enable Input (Active LOW)
LE
n
Latch Enable Input
I
0
- I
31
Inputs
O
0
- O
31
Outputs
1
2
3
4
5
6
A
O
1
O
0
OE
1
LE
1
I
0
I
1
B
O
3
O
2
GND
GND
I
2
I
3
C
O
5
O
4
V
CC
V
CC
I
4
I
5
D
O
7
O
6
GND
GND
I
6
I
7
E
O
9
O
8
GND
GND
I
8
I
9
F
O
11
O
10
V
CC
V
CC
I
10
I
11
G
O
13
O
12
GND
GND
I
12
I
13
H
O
14
O
15
OE
2
LE
2
I
15
I
14
J
O
17
O
16
OE
3
LE
3
I
16
I
17
K
O
19
O
18
GND
GND
I
18
I
19
L
O
21
O
20
V
CC
V
CC
I
20
I
21
M
O
23
O
22
GND
GND
I
22
I
23
N
O
25
O
24
GND
GND
I
24
I
25
P
O
27
O
26
V
CC
V
CC
I
26
I
27
R
O
29
O
28
GND
GND
I
28
I
29
T
O
30
O
31
OE
4
LE
4
I
31
I
30
Inputs
Outputs
LE
n
OE
n
I
n
O
n
X
H
X
Z
H
L
L
L
H
L
H
H
L
L
X
O
0
Preliminary
3
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7
4
LCX32373
Logic Diagrams
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Preliminary
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4
74LCX32373
Absolute Maximum Ratings
(Note 3)
Recommended Operating Conditions
(Note 5)
Note 3: 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 4: I
O
Absolute Maximum Rating must be observed.
Note 5: Unused inputs 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 4)
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
T
A
=
-
40
°
C to
+
85
°
C
Units
(V)
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
µ
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
µ
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
µ
A
I
OZ
3-STATE Output Leakage
0
V
O
5.5V
2.3
-
3.6
±
5.0
µ
A
V
I
=
V
IH
or V
IL
I
OFF
Power-Off Leakage Current
V
I
or V
O
=
5.5V
0
10
µ
A
Preliminary
5
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7
4
LCX32373
DC Electrical Characteristics
(Continued)
Note 6: Outputs disabled or 3-STATE only.
AC Electrical Characteristics
Dynamic Switching Characteristics
Capacitance
Symbol
Parameter
Conditions
V
CC
T
A
=
-
40
°
C to
+
85
°
C
Units
(V)
Min
Max
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.3
-
3.6
20
µ
A
3.6V
V
I
, V
O
5.5V (Note 6)
2.3
-
3.6
±
20
I
CC
Increase in I
CC
per Input
V
IH
=
V
CC
-
0.6V
2.3
-
3.6
500
µ
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
5.4
1.5
5.9
1.5
6.5
ns
t
PLH
I
n
to O
n
1.5
5.4
1.5
5.9
1.5
6.5
t
PHL
Propagation Delay
1.5
5.5
1.5
6.4
1.5
6.6
ns
t
PLH
LE to O
n
1.5
5.5
1.5
6.4
1.5
6.6
t
PZL
Output Enable Time
1.5
6.1
1.5
6.5
1.5
7.9
ns
t
PZH
1.5
6.1
1.5
6.5
1.5
7.9
t
PLZ
Output Disable Time
1.5
6.0
1.5
6.3
1.5
7.2
ns
t
PHZ
1.5
6.0
1.5
6.3
1.5
7.2
t
S
Setup Time, I
n
to LE
2.5
2.5
3.0
ns
t
H
Hold Time, I
n
to LE
1.5
1.5
2.0
ns
t
W
LE Pulse Width
3.0
3.0
3.5
ns
Symbol
Parameter
Conditions
V
CC
T
A
=
25
°
C
Units
(V)
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
OUT
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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