1
PS8087C 10/05/04
Description
Pericom Semiconductor's PI74ALVCH16244 is an non-inverting
16-bit buffer/driver designed for low-voltage 2.3V to 3.6V V
CC
operation.
The buffer/driver is designed specifically to improve both the
performance and density of 3-State memory address drivers, clock
drivers, and bus-oriented receivers and transmitters.
The device can be used as four 4-bit buffers, two 8-bit buffers, or
one 16-bit buffer. It provides non-inverting outputs and symmetri-
cal active-low output-enable (OE) inputs.
To ensure the high-impedance state during power up or power
down, OE should be tied to V
CC
through a pullup resistor in which
the minimum value is determined by the current-sinking capability
of the driver.
The PI74ALVCH16244 has "Bus Hold" which retains the data
input's last state whenever the data input goes to high-impedance
preventing "floating" inputs and eliminating the need for pullup/
down resistors.
Features
Designed for low-voltage operation
V
CC
= 2.3V to 3.6V
Hysteresis on all inputs
Typical V
OLP
(Output Ground Bounce)
< 0.8V at V
CC
= 3.3V, T
A
= 25C
Typical V
OHV
(Output V
OH
Undershoot)
< 2.0V at V
CC
= 3.3V, T
A
= 25C
Bus Hold retains last active bus state during 3-State,
eliminating the need for external pullup resistors
Industrial operation at 40C to +85C
Packaging:
48-pin 240-mil wide plastic TSSOP (A)
Block Diagram
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16-Bit Buffer Driver
with 3-State Outputs
PI74ALVCH16244
1OE
1A1
1Y1
1A2
1Y2
1A3
1Y3
1A4
1
47
46
44
43
48
41
40
38
37
25
36
35
33
32
24
30
29
27
26
1Y4
2
3
5
6
8
9
11
12
13
14
16
17
19
20
22
23
3OE
3A1
3Y1
3A2
3Y2
3A3
3Y3
3A4
3Y4
2OE
2A1
2Y1
2A2
2Y2
2A3
2Y3
2A4
2Y4
4OE
4A1
4Y1
4A2
4Y2
4A3
4Y3
4A4
4Y4
PI74ALVCH16244
16-Bit Buffer Driver
with 3-State Outputs
2
PS8087C 10/05/04
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s
t
u
p
n
I
s
t
u
p
t
u
O
E
O
n
x
A
n
x
Y
n
L
H
H
L
L
L
H
X
Z
Pin Description
Truth Table
(1)
Pin Configuration
Notes:
1. H = High Signal Level
L = Low Signal Level
X = Don't Care or Irrelevant
Z = High Impedance
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
1OE
1Y1
1Y2
GND
GND
GND
GND
VCC
VCC
4OE
1Y3
1Y4
2Y1
2Y2
2Y3
2Y4
3Y1
3Y2
3Y3
3Y4
4Y1
4Y2
4Y3
4Y4
2OE
1A1
1A2
GND
GND
GND
GND
VCC
VCC
3OE
1A3
1A4
2A1
2A2
2A3
2A4
3A1
3A2
3A3
3A4
4A1
4A2
4A3
4A4
e
m
a
N
n
i
P
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p
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c
s
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D
E
O
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W
O
L
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v
it
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A
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l
b
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O
e
t
a
t
S
-
3
x
A
n
s
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u
p
n
I
x
Y
n
s
t
u
p
t
u
O
e
t
a
t
S
-
3
D
N
G
d
n
u
o
r
G
V
C
C
r
e
w
o
P
PI74ALVCH16244
16-Bit Buffer Driver
with 3-State Outputs
3
PS8087C 10/05/04
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Storage Temperature .............................................................. 65C to +150C
Ambient Temperature with Power Applied ........................... 40C to +85C
Input Voltage Range, V
IN .........................................................
0.5V to V
CC
+0.5V
Output Voltage Range, V
OUT ..................................................
0.5V to V
CC
+0.5V
DC Input Voltage ...................................................................... 0.5V to +5.0V
DC Output Current ............................................................................... 100mA
Power Dissipation ..................................................................................... 1.0W
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 conditions above those indicated in the
operational sections of this specification is not implied. Expo-
sure to absolute maximum rating conditions for extended periods
may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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7
.
1
=
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6
=
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A
m
C
C
=
V
3
.
2
0
.
2
V
H
I
I
,
V
7
.
1
=
H
O
2
1
=
V
,
A
m
C
C
=
V
3
.
2
7
.
1
V
H
I
I
,
V
0
.
2
=
H
O
2
1
=
V
,
A
m
C
C
=
V
7
.
2
2
.
2
V
H
I
I
,
V
0
.
2
=
H
O
2
1
=
V
,
A
m
C
C
=
V
0
.
3
4
.
2
V
H
I
I
,
V
0
.
2
=
H
O
4
2
=
V
,
A
m
C
C
=
V
0
.
3
0
.
2
V
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g
a
tl
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1
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V
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0
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=
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C
C
=
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3
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2
4
.
0
V
L
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,
V
7
.
0
=
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2
1
=
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A
m
C
C
=
V
3
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2
7
.
0
V
L
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,
V
8
.
0
=
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2
1
=
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A
m
C
C
=
V
7
.
2
4
.
0
V
L
I
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,
V
8
.
0
=
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4
2
=
V
,
A
m
C
C
=
V
0
.
3
5
5
.
0
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V
3
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2
=
2
1
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m
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C
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V
7
.
2
=
2
1
V
C
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V
0
.
3
=
4
2
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3
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2
=
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1
V
C
C
V
7
.
2
=
2
1
V
C
C
V
0
.
3
=
4
2
PI74ALVCH16244
16-Bit Buffer Driver
with 3-State Outputs
4
PS8087C 10/05/04
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Switching Characteristics over Operating Range
(1)
Operating Characteristics, T
A
= 25C
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2
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5
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2
=
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3
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3
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3
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p
0
5
=
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H
M
0
1
=
f
6
1
9
1
F
p
d
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b
a
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i
D
s
t
u
p
t
u
O
4
5
Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. Recommended operating condition.
Notes:
1. For conditions shown as Max. or Min., 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. Unused Control Inputs must be held HIGH or LOW to prevent them from floating.
DC Electrical Characteristics-
Continued (Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.3V 10%)
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=
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A
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N
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(
HOLD
)
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2
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1
=
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3
.
2
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8
.
0
=
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V
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.
3
=
5
7
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V
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V
0
.
2
=
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V
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.
3
=
5
7
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0
=
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,
V
6
.
3
C
C
V
6
.
3
=
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-
3
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=
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C
V
6
.
3
=
0
1
I
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l
p
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S
V
C
C
=
V
6
.
3
I
,
T
U
O
0
=
,
A
V
N
I
V
r
o
D
N
G
=
C
C
0
4
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T
T
@
V
C
C
V
0
.
3
=
o
t
6
.
3 V
V
t
a
t
u
p
n
I
e
n
O
C
C
-
V
6
.
0
V
t
a
s
t
u
p
n
I
r
e
h
t
O
C
C
D
N
G
r
o
0
5
7
C
I
s
t
u
p
n
I
l
o
r
t
n
o
C
V
N
I
V
=
C
C
V
,
D
N
G
r
o
C
C
V
3
.
3
=
3
F
p
s
t
u
p
n
I
a
t
a
D
6
C
O
s
t
u
p
t
u
O
V
O
V
=
C
C
V
,
D
N
G
r
o
C
C
V
3
.
3
=
7
PI74ALVCH16244
16-Bit Buffer Driver
with 3-State Outputs
5
PS8087C 10/05/04
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Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Packaging Mechanical 48-pin TSSOP (A)
.236
.244
.488
.496
.002
.006
SEATING PLANE
.007
.010
.0197
BSC
.004
.008
.319
1
48
12.4
12.6
6.0
6.2
0.50
0.17
0.27
8.1
0.05
0.15
0.09
0.20
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.018
.030
0.45
0.75
.047
1.20 Max
BSC
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Ordering Information
Ordering Code
Package Code
Package Type
PI74ALVCH16244A
A
48-pin TSSOP
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