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PI74LPT16244
3.3V, 16-Bit Buffer/Line Driver
Product Description:
Pericom Semiconductors PI74LPT series of logic circuits are pro-
duced in the Companys advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74LPT16244 is a 16-bit buffer/line driver designed for driving
high capacitive memory loads. With its balanced-drive characteristics,
this high-speed, low power device provides lower ground bounce,
transmission line matching of signals, fewer line reflections and
lower EMI and RFI effects. This makes it ideal for driving on-board
buses and transmission lines. This device is designed with three-
state controls to operate in a Quad-Nibble, Dual-Byte, or a single 16-
bit word mode.
The PI74LPT16244 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.
Logic Block Diagram
1
OE
1
A
0
1
Y
0
1
A
1
1
Y
1
1
A
2
1
Y
2
1
A
3
1
Y
3
3
OE
3
A
0
3
Y
0
3
A
1
3
Y
1
3
A
2
3
Y
2
3
A
3
3
Y
3
2
OE
2
A
0
2
Y
0
2
A
1
2
Y
1
2
A
2
2
Y
2
2
A
3
2
Y
3
4
OE
4
A
0
4
Y
0
4
A
1
4
Y
1
4
A
2
4
Y
2
4
A
3
4
Y
3
Product Features:
Compatible with LCX and LVT 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
Packages available:
48-pin 240 mil wide thin plastic TSSOP (A)
48-pin 300 mil wide plastic SSOP (V)
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PS2067A 01/15/97
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PI74LPT16244
3.3V, 16-Bit Buffer/Line Driver
Product Pin Configuration
Product Pin Description
Pin Name
Description
xOE
3-State Output Enable Inputs (Active LOW)
xAx
Inputs
xYx
3-State Outputs
GND
Ground
V
CC
Power
Inputs
(1)
Outputs
(1)
X
OE
xAx
xYx
L
L
L
L
H
H
H
X
Z
Truth Table
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
48-PIN
V48
A48
Note:
1. This parameter is determined by device characterization but is not production tested.
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
pF
1
2
3
4
5
6
7
8
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
32
31
30
29
28
27
26
25
1
OE
1
Y
0
1
Y
1
GND
1
Y
2
1
Y
3
V
CC
2
Y
0
2
Y
1
GND
2
Y
2
2
Y
3
3
Y
0
3
Y
1
GND
3
Y
2
3
Y
3
V
CC
4
Y
0
4
Y
1
GND
4
Y
2
4
Y
3
4
OE
48-PIN
V48
A48
2
OE
1
A
0
1
A
1
GND
1
A
2
1
A
3
V
CC
2
A
0
2
A
1
GND
2
A
2
2
A
3
3
A
0
3
A
1
GND
3
A
2
3
A
3
V
CC
4
A
0
4
A
1
GND
4
A
2
4
A
3
3
OE
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PI74LPT16244
3.3V, 16-Bit Buffer/Line Driver
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
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.5
0.8
V
(Input and I/O pins)
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
A
I
IL
Input LOW Current (Input pins)
V
CC
= Max.
V
IN
= GND
1
A
Input LOW Current (I/O pins)
V
CC
= Max.
V
IN
= GND
1
A
I
OZH
High Impedance Output Current
V
CC
= Max.
V
OUT
= 5.5V
1
A
I
OZL
(3-State Output pins)
V
CC
= Max.
V
OUT
= GND
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18 mA
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
mA
V
OH
Output HIGH Voltage
V
CC
= Min.
I
OH
= 0.1 mA Vcc-0.2
V
V
IN
= V
IH
or V
IL
I
OH
= 3 mA
2.4
3.0
V
V
CC
= 3.0V,
I
OH
= 8 mA
2.4
(5)
3.0
V
V
IN
= V
IH
or V
IL
I
OH
= 24 mA
2.0
V
OL
Output LOW Voltage
V
CC
= Min.
I
OL
= 0.1 mA
0.2
V
V
IN
= V
IH
or V
IL
I
OL
= 16 mA
0.2
0.4
V
I
OL
= 24 mA
0.3
0.5
V
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
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 de-
vice. This is a stress rating only and functional opera-
tion of the device at these or any other conditions
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.
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 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.
Storage Temperature ............................................................ 55C to +125C
Ambient Temperature with Power Applied ........................... 40C to +85C
Supply Voltage to Ground Potential (Inputs & Vcc 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
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PI74LPT16244
3.3V, 16-Bit Buffer/Line Driver
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
V
CC
= Max.
V
IN
= V
CC
0.6V
(3)
2.0
30
A
TTL Inputs HIGH
I
CCD
Dynamic Power Supply
(4)
V
CC
= Max.,
V
IN
= V
CC
50
75
A/
Outputs Open
V
IN
= GND
MHz
X
OE = GND
One Bit Toggling
50% Duty Cycle
I
C
Total Power Supply
V
CC
= Max.,
V
IN
= V
CC
0.6V
0.5
0.8
mA
Current
(6)
Outputs Open
V
IN
= GND
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = GND
One Bit Toggling
V
CC
= Max.,
V
IN
= V
CC
0.6V
2.0
3.3
(5)
Outputs Open
V
IN
= GND
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = GND
16 Bits Toggling
Notes:
1. ForMax. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 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.
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PI74LPT16244
3.3V, 16-Bit Buffer/Line Driver
Switching Characteristics over Operating Range
(1)
LPT16244
LPT16244A
LPT16244C
Com.
Com.
Com.
Parameters
Description
Conditions
(2)
Min
(3)
Max
Min
(3)
Max
Min
(3)
Max
Unit
t
PLH
Propagation Delay
C
L
= 50 pF
1.5
5.2
1.5
4.8
1.5
4.1
ns
t
PHL
X
A
X
to
X
Y
X
R
L
= 500
t
PZH
Output Enable Time
1.5
7.0
1.5
6.2
1.5
5.8
ns
t
PZL
xOE to xYx
t
PHZ
Output Disable Time
(4)
1.5
7.0
1.5
5.6
1.5
5.2
ns
t
PLZ
xOE to xYx
t
SK
(o)
Output Skew
(5)
0.5
0.5
0.5
ns
Notes:
1. Propagation Delays and Enable/Disable times are with Vcc = 3.3V 0.3V, normal range. For Vcc = 2.7V, extended range, all
Propagation Delays and Enable/Disable times should be degraded by 20%.
2. See test circuit and wave forms.
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.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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