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PS8309 07/30/98
Product Description
Pericom Semiconductors PI74ALVCH series of logic circuits are
produced in the Companys advanced 0.5 micron CMOS technology,
achieving industry leading speed.
The PI74ALVCHT16244 is a 16-bit buffer/driver designed for 2.3V
to 3.6V VCC 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 true outputs and symmetrical active-low
output-enable (OE) inputs.
To ensure the high-impedance state during power up or power down,
OE should be tied to VCC through a pullup resistor; the minimum
value of the resistor is determined by the current-sinking capability
of the driver.
The PI74ALVCHT16244 has Bus Hold which retains the data
inputs last state whenever the data input goes to high-impedance
preventing floating inputs and eliminating the need for pullup/
down resistors.
The PI74ALVCHT16244 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.
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Product Features
• PI74ALVCHT16244 is designed for low voltage operation
• VCC = 2.3V to 3.6V
• 5V I/O Tolerant
• Hysteresis on all inputs
• Typical VOLP (Output Ground Bounce)
< 0.8V at VCC = 3.3V, TA = 25°C
• Typical VOHV (Output VOH Undershoot)
< 2.0V at VCC = 3.3V, TA = 25°C
• Bus Hold retains last active bus state during 3-state
eliminates the need for external pullup resistors
• Industrial operation at 40°C to +85°C
• Packages available:
48-pin 240 mil wide plastic TSSOP (A)
48-pin 300 mil wide plastic SSOP (V)
PI74ALVCHT16244
16-Bit Buffer/Driver
with 3-State Outputs
Logic Block Diagram
1
OE
1A11
Y
1
1A21
Y
2
1A31
Y
3
1A41
Y
4
3
OE
3A13
Y
1
3A23
Y
2
3A33
Y
3
3A43
Y
4
2
OE
2A12
Y
1
2A22
Y
2
2A32
Y
3
2A42
Y
4
4
OE
4A14
Y
1
4A24
Y
2
4A34
Y
3
4A44
Y
4
43
44
46
47
1
37
38
40
41
48
12
11
9
8
6
5
3
2
32
33
35
36
25
17
16
14
13
26
27
29
30
24
23
22
20
19
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PS8309 07/30/98
PI74ALVCHT16244
16-Bit Buffer Driver with 3-State Outputs
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Pin Name Description
nOE 3-State Output Enable Inputs (Active LOW)
nAx Inputs
nYx 3-State Outputs
GND Ground
VCC Power
Product Pin Description
Truth Table
(1)
Notes:
1. H = High Signal Level
L = Low Signal Level
X = Don’t Care or Irrelevant
Z = High Impedance
Product Pin Configuration
1OE
1Y1
1Y2
GND
1Y3
1Y4
VCC
2Y1
2Y2
GND
2Y3
2Y4
3Y1
3Y2
GND
3Y3
3Y4
VCC
4Y1
4Y2
GND
4Y3
4Y4
4OE
stupnIstuptuO
EOnAn
X
xYn
LH H
LL L
HX Z
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
2OE
1A1
1A2
GND
1A3
1A4
VCC
2A1
2A2
GND
2A3
2A4
3A1
3A2
GND
3A3
3A4
VCC
4A1
4A2
GND
4A3
4A4
3OE
48-PIN
V48
A48
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. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
Storage Temperature .............................................. 65°C to +150°C
Ambient Temperature with Power Applied ........... 40°C to +85°C
Input Voltage Range, V
IN ........................................... 0.5V to
+6.0V
Output Voltage Range, VOUT ....................................0.5V to +6.0V
DC Input Voltage ....................................................... 0.5V to
+6.0V
DC Output Current ................................................................. 50 mA
Power Dissipation ..................................................................... 1.0W
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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PS8309 07/30/98
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PI74ALVCHT16244
16-Bit Buffer Driver with 3-State Outputs
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, +25°C ambient and maximum loading.
3. Unused Control Inputs must be held HIGH or LOW to prevent them from floating.
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 3.3V ± 10%)
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IH
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OH
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CC
=V7.22.2
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IH
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OH
21-=V,Am
CC
=V0.34.2
V
IH
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OH
42-=V,Am
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OL
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V
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OL
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CC
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CC
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V
CC
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CC
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V
CC
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CC
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IN
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CC
V6.3=005±
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OZ
tnerruCtuptuO
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OUT
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mA
ccItnerruCylppuS
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CC
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OUT
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V
IN
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CC
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PS8309 07/30/98
PI74ALVCHT16244
16-Bit Buffer Driver with 3-State Outputs
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Switching Characteristics over Operating Range
(1)
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
Operating Characteristics, TA = 25ºC
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. Recommended operating condition.
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