1
PS2069C 10/05/04
Description
Pericom Semiconductor's PI74LPT16373 is a 16-bit transparent
latch designed with 3-state outputs and are intended for bus oriented
applications. The Output Enable and Latch Enable controls are
organized to operate as two 8-bit latches or one 16-bit latch. When
Latch Enable (LE) is HIGH, the flip-flops appear transparent to
the data. The data that meets the set-up time when LE is LOW is
latched. When OE is HIGH, the bus output is in the high impedance
state.
The PI74LPT16373 can be driven from either 3.3V or 5.0V
devices allowing this device to be used as a translator in a mixed
3.3/5.0V system.
PI74LPT16373
Fast CMOS 3.3V 16-Bit
Transparent Latch
Features
Compatible with LCXTM and LVTTM families of products
Supports 5V Tolerant Mixed Signal Mode Operation
Input can be 3V or 5V
Output can be 3V or connected to 5V bus
Advanced Low Power CMOS Operation
Excellent output drive capability:
Balanced drives (24 mA sink and source)
Pin compatible with industry standard double-density pinouts
Low ground bounce outputs
Hysteresis on all inputs
Industrial operating temperature range: 40C to +85C
Multiple center pins and distributed Vcc/GND pins minimize
switching noise
Packaging:
48-pin 240-mil wide thin plastic TSSOP (A)
48-pin 300-mil wide plastic SSOP (V)
Block Diagram
1
OE
1
LE
1
O
0
C
D
1
D
0
TO 7 OTHER CHANNELS
2
OE
2
LE
2
O
0
C
D
2
D
0
TO 7 OTHER CHANNELS
PI74LPT16373
3.3V 16-Bit Transparent Latch
2
PS2069C 10/05/04
Pin Configuration
Pin Description
Pi
n Name
Description
xOE
3-State Output Enable Inputs (Active LOW)
xLE
Latch Enable Inputs (Active HIGH)
xDx
Data Inputs
xOx
3-State Outputs
GND
Ground
V
CC
Power
Truth Table
Inputs
(1)
Outputs
(1)
xDx
xLE
xOE
xOx
H
H
L
H
L
H
L
L
X
X
H
Z
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
1
OE
1
1
O
0
2
1
O
1
3
GND
4
1
O
2
5
1
O
3
6
V
CC
7
1
O
4
8
1
O
5
9
GND
10
1
O
6
11
1
O
7
12
2
O
0
13
2
O
1
14
GND
15
2
O
2
16
2
O
3
17
V
CC
18
2
O
4
19
2
O
5
20
GND
21
2
O
6
22
2
O
7
23
2
OE
24
1
LE
48
1
D
0
47
1
D
1
46
GND
45
1
D
2
44
1
D
3
43
V
CC
42
1
D
4
41
1
D
5
40
GND
39
1
D
6
38
1
D
7
37
2
D
0
36
2
D
1
35
GND
34
2
D
2
33
2
D
3
32
V
CC
31
2
D
4
30
2
D
5
29
GND
28
2
D
6
27
2
D
7
26
2
LE
25
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other con-
ditions above those indicated in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability.
Storage Temperature ............................................................. 55C to +125C
Ambient Temperature with Power Applied ............................ 40C to +85C
Supply Voltage to Ground Potential (Inputs & V
CC
Only)...... 0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ... 0.5V to +7.0V
DC Input Voltage ..................................................................... 0.5V to +7.0V
DC Output Current............................................................................... 120 mA
Power Dissipation .................................................................................... 1.0W
PI74LPT16373
3.3V 16-Bit Transparent Latch
3
PS2069C 10/05/04
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 2.7V to 3.6V)
Parameters
Description
Test Conditions
(1)
Min.
Typ
(2)
Max. Units
V
IH
Input HIGH Voltage (Input pins)
Guaranteed Logic HIGH Level
2.2
--
5.5
V
Input HIGH Voltage (I/O pins)
2.0
--
5.5
V
IL
Input LOW Voltage
(Input and I/O pins)
Guaranteed Logic LOW Level
0.5
--
0.8
I
IH
Input HIGH Current (Input pins) V
CC
= Max.
V
IN
= 5.5V
--
--
1
A
Input HIGH Current (I/O pins)
V
CC
= Max.
V
IN
= V
CC
--
--
1
I
IL
Input LOW Current (Input pins)
V
CC
= Max.
V
IN
= GND
--
--
1
Input LOW Current (I/O pins)
V
CC
= Max.
V
IN
= GND
--
--
1
I
OZH
High Impedance Output Current
V
CC
= Max.
V
OUT
= 5.5V
--
--
1
I
OZL
(3-State Output pins)
V
CC
= Max.
V
OUT
= GND
--
--
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
--
0.7
1.2
V
I
ODH
Output HIGH Current
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
,
V
O
= 1.5V
(3)
36
60
110
mA
I
ODL
Output LOW Current
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
,
V
O
= 1.5V
(3)
50
90
200
V
OH
Output HIGH Voltage
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OL
= 0.1 mA V
CC
-0.2
--
--
V
I
OL
= 3 mA
2.4
3.0
--
V
CC
= 3.0V,
V
IN
= V
IH
or V
IL
I
OL
= 8 mA
2.4
(5)
3.0
--
I
OL
= 24 mA
2.0
--
--
V
OL
Output LOW Voltage
V
CC
= Min.
I
OL
= 0.1 mA
--
--
0.2
V
IN
= V
IH
or V
IL
I
OL
= 16 mA
--
0.2
0.4
I
OL
= 24 mA
--
0.3
0.5
I
OS
Short Circuit Current
(4)
V
CC
= Max.
(3)
, V
OUT
= GND
60
85
240
mA
I
OFF
Power Down Disable
V
CC
= 0V, V
IN
or V
OUT
4.5V
--
--
100
A
V
H
Input Hysteresis
--
150
--
mV
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3V, +25C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= V
CC
0.6V at rated current.
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(1)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
4.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8
Note:
1. This parameter is determined by device characterization but is not production tested.
PI74LPT16373
3.3V 16-Bit Transparent Latch
4
PS2069C 10/05/04
Power Supply Characteristics
Parameters
Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power Supply
Current
V
CC
= Max.
V
IN
= GND or
V
CC
0.1
10
A
I
CC
Quiescent Power Supply
Current TTL Inputs HIGH
V
CC
= Max.
V
IN
= V
CC
0.6V
(3)
500
I
CCD
Dynamic Power Supply
(4)
V
CC
= Max.,
Outputs Open
X
OE = GND
xLE = Vcc
One Bit Toggling
50% Duty Cycle
V
IN
= V
CC
V
IN
= GND
50
75
A/
MHz
I
C
Total Power Supply
Current
(6)
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = GND
One Bit Toggling
V
IN
= V
CC
0.6V
V
IN
= GND
0.6
X
LE =
V
CC
2.3
mA
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = GND
16 Bits Toggling
V
IN
= V
CC
0.6V
V
IN
= GND
2.1
X
LE =
V
CC
4.7
(5)
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 3.3V, +25C ambient.
3. Per TTL driven input; all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+ I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current (I
CCL
, I
CCH
and I
CCZ
)
I
CC
= Power Supply Current for a TTL High Input
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
N
CP
= Number of Clock Inputs at f
CP
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
PI74LPT16373
3.3V 16-Bit Transparent Latch
5
PS2069C 10/05/04
Switching Characteristics over Operating Range
(1)
Parameters
Description
Conditions
(2)
LPT16373
LPT16373A
LPT16373C
Units
Com.
Com.
Com.
Min
(3)
Max
Min
(3)
Max
Min
(3)
Max
t
PLH
t
PHL
Propagation Delay
xDx to xOx
C
L
= 50pF
R
L
= 500
1.5
7.0
1.5
5.2
1.5
4.2
ns
t
PLH
t
PHL
Propagation Delay
xLE to xOx
2.0
7.0
2.0
6.5
2.0
5.5
t
PZH
t
PZL
Output Enable Time
xOE to xOx
1.5
7.2
1.5
6.5
1.5
5.5
t
PHZ
t
PLZ
Output Disable Time
(4)
xOE to xOx
1.5
7.2
1.5
5.5
1.5
5.0
t
SU
Setup Time HIGH
or LOW, xDx to xLE
2.0
2.0
2.0
t
H
Hold Time HIGH
or LOW, xDx to xLE
1.5
1.5
1.5
t
W
xLE Pulse Width
(4)
HIGH
6.0
5.0
5.0
t
SK(
O
)
Output Skew
(5)
0.5
0.5
0.5
Notes:
1. Propagation Delays and Enable/Disable times are with V
CC
= 3.3V 0.3V, normal range. For V
CC
= 2.7V, extended range, all Propagation
Delays and Enable/Disable times should be degraded by 20%.
2. See test circuit and waveforms.
3. Minimum limits are guaranteed but not tested on Propagation Delays.
4. This parameter is guaranteed but not production tested.
5. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
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