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74ALVC162373 Low Voltage 16-Bit Transparent Latch
November 2001
Revised November 2001
74ALVC162373
Low Voltage 16-Bit Transparent Latch
with 3.6V Tolerant Inputs and Outputs
and 26
Ω
Series Resistors in Outputs
General Description
The ALVC162373 contains sixteen non-inverting latches
with 3-STATE outputs and is intended for bus oriented
applications. The device is byte controlled. The flip-flops
appear to be 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 out-
puts are in a high impedance state.
The ALVC162373 is also designed with 26
Ω
resistors in
the outputs. This design reduces line noise in applications
such as memory address drivers, clock drivers and bus
transceivers/transmitters.
The 74ALVC162373 is designed for low voltage (1.65V to
3.6V) V
CC
applications with I/O compatibility up to 3.6V.
The 74ALVC162373 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s
1.65V to 3.6V V
CC
supply operation
s
3.6V tolerant inputs and outputs
s
26
Ω
series resistors in outputs
s
t
PD
(I
n
to O
n
)
3.8 ns max for 3.0V to 3.6V V
CC
5.0 ns max for 2.3V to 2.7V V
CC
9.0 ns max for 1.65V to 1.95V V
CC
s
Power-off high impedance inputs and outputs
s
Support live insertion and withdrawal (Note 1)
s
Uses patented noise/EMI reduction circuitry
s
Latchup conforms to JEDEC JED78
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
Note 1:
To ensure the high-impedance state during power up or power
down, OE should be tied to V
CC
through a pull-up resistor; the minimum
value of the resistor is determined by the current-sourcing capability of the
driver.
Ordering Code:
Ordering Number Package Number
74ALVC162373T
MTD48
Package Description
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
OE
n
LE
n
I
0
–I
15
O
0
–O
15
Description
Output Enable Input (Active LOW)
Latch Enable Input
Inputs
Outputs
© 2001 Fairchild Semiconductor Corporation
DS500709
www.fairchildsemi.com
74ALVC162373
Connection Diagram
Truth Tables
Inputs
LE
1
X
H
H
L
OE
1
H
L
L
L
Inputs
LE
2
X
H
H
L
OE
2
H
L
L
L
I
8
–I
15
X
L
H
X
I
0
–I
7
X
L
H
X
Outputs
O
0
–O
7
Z
L
H
O
0
Outputs
O
8
–O
15
Z
L
H
O
0
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial (HIGH or LOW, inputs may not float)
Z
=
High Impedance
O
0
=
Previous O
0
before HIGH-to-LOW of Latch Enable
Functional Description
The 74ALVC162373 contains sixteen edge D-type latches
with 3-STATE 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
16-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 on LE
n
. The
3-STATE outputs are controlled by the Output Enable
(OE
n
) input. When OE
n
is LOW the standard outputs are in
the 2-state mode. When OE
n
is HIGH, the standard outputs
are in the high impedance mode but this does not interfere
with entering new data into the latches.
Logic Diagram
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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2
74ALVC162373
Absolute Maximum Ratings
(Note 2)
Supply Voltage (V
CC
)
DC Input Voltage (V
I
)
Output Voltage (V
O
) (Note 3)
DC Input Diode Current (I
IK
)
V
I
<
0V
DC Output Diode Current (I
OK
)
V
O
<
0V
DC Output Source/Sink Current
(I
OH
/I
OL
)
DC V
CC
or GND Current per
Supply Pin (I
CC
or GND)
Storage Temperature Range (T
STG
)
−
0.5V to
+
4.6V
−
0.5V to 4.6V
−
0.5V to V
CC
+
0.5V
−
50 mA
−
50 mA
±
50 mA
±
100 mA
−
65
°
C to
+
150
°
C
Recommended Operating
Conditions
(Note 4)
Power Supply
Operating
Input Voltage
Output Voltage (V
O
)
Free Air Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
t/
∆
V)
V
IN
=
0.8V to 2.0V, V
CC
=
3.0V
10 ns/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 Rat-
ings. The “Recommended Operating Conditions” table will define the condi-
tions for actual device operation.
Note 3:
I
O
Absolute Maximum Rating must be observed.
Note 4:
Floating or unused control inputs must be held HIGH or LOW.
1.65V to 3.6V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
DC Electrical Characteristics
Symbol
V
IH
Parameter
HIGH Level Input Voltage
Conditions
V
CC
(V)
1.65 - 1.95
2.3 - 2.7
2.7 - 3.6
V
IL
LOW Level Input Voltage
1.65 - 1.95
2.3 - 2.7
2.7 - 3.6
V
OH
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −2
mA
I
OH
= −4
mA
I
OH
= −6
mA
I
OH
= −8
mA
I
OH
= −12
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
2 mA
I
OL
=
4 mA
I
OL
=
6 mA
I
OL
=
8 mA
I
OL
=
12 mA
I
I
I
OZ
I
CC
∆I
CC
Input Leakage Current
3-STATE Output Leakage
Quiescent Supply Current
Increase in I
CC
per Input
0
≤
V
I
≤
3.6V
0
≤
V
O
≤
3.6V
V
I
=
V
CC
or GND, I
O
=
0
V
IH
=
V
CC
−
0.6V
1.65 - 3.6
1.65
2.3
2.3
3
2.7
3.0
1.65 - 3.6
1.65
2.3
2.3
3
2.7
3
3.6
3.6
3.6
3 - 3.6
V
CC
- 0.2
1.2
1.9
1.7
2.4
2
2
0.2
0.45
0.4
0.55
0.55
0.6
0.8
±5.0
±10
40
750
µA
µA
µA
µA
V
V
Min
0.65 x V
CC
1.7
2.0
0.35 x V
CC
0.7
0.8
V
V
Max
Units
3
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74ALVC162373
AC Electrical Characteristics
T
A
= −40°C
to
+85°C,
R
L
=
500Ω
Symbol
Parameter
C
L
=
50 pF
V
CC
=
3.3V
±
0.3V
Min
t
PHL
, t
PLH
t
PHL
, t
PLH
t
PZL
, t
PZH
t
PLZ
, t
PHZ
t
W
t
S
t
H
Propagation Delay
Bus to Bus
Propagation Delay
LE to Bus
Output Enable Time
Output Disable Time
Pulse Width
Setup Time
Hold Time
1.3
1.3
1.3
1.3
1.5
1.5
1.0
Max
3.8
4.1
4.4
4.5
V
CC
=
2.7V
Min
1.5
1.5
1.5
1.5
1.5
1.5
1.0
Max
5.0
5.4
5.9
4.9
C
L
=
30 pF
V
CC
=
2.5V
±
0.2V
Min
1.0
1.0
1.0
1.0
1.5
1.5
1.0
Max
4.5
4.9
5.4
4.4
V
CC
=
1.8V
±
0.15V
Min
1.5
1.5
1.5
1.5
4.0
2.5
1.0
Max
9.0
9.8
9.8
7.9
ns
ns
ns
ns
ns
ns
ns
Units
Capacitance
Symbol
C
IN
C
OUT
C
PD
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Parameter
Conditions
V
I
=
0V or V
CC
V
I
=
0V or V
CC
Outputs Enabled f
=
10 MHz, C
L
=
50 pF
T
A
= +25°C
V
CC
3.3
3.3
3.3
2.5
Typical
6
7
20
20
Units
pF
pF
pF
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