1
PS8095B 10/07/98
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20-Bit Buffer Driver
with 3-STATE Outputs
PI74ALVCH162827
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 PI74ALVCH162827 is a 20-bit non-inverting buffer/driver
designed for 2.3V to 3.6V V
CC
operation.
The buffer/driver is composed of two 10-bit sections with separate
output-enable signals. For either 10-bit buffer section, the two
output-enable (1OE1 and 1OE2 or 2OE1 and 2OE2) inputs must
both be low for the corresponding Y outputs to be active. If either
output-enable input is HIGH, the outputs of that 10-bit buffer
section are in the high-impedance state.
The outputs, which are designed to sink up to 12mA, include 26
resistors to reduce overshoot and undershoot.
To ensure the high-impedance state during power up or power
down, OE should be tied to V
CC
through a pullup resistor; the
minimum value of the resistor is determined by the current-sinking
capability of the driver.
The PI74ALVCH162827 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.
Product Features
PI74ALVCH162827 is 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
Output ports have equivalent 26
series resistors;
no external resistors are required
Bus Hold retains last active bus state during 3-STATE,
eliminating the need for external pullup resistors
Industrial operation at 40C to +85C
Packages available:
56-pin 240 mil wide plastic TSSOP (A)
56-pin 300 mil wide plastic SSOP (V)
Logic Block Diagram
1
56
55
1
A
1
1
OE
2
1
OE
1
1
Y
1
2
To 9 Other Channels
28
29
42
2
A
1
2
OE
2
2
OE
1
2
Y
1
15
To 9 Other Channels
PI74ALVCH162827
20-Bit Buffer Driver with 3-STATE Outputs
2
PS8095B 10/07/98
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1OE1
1Y1
1Y2
GND
1Y3
1Y4
VCC
1Y5
1Y6
1Y7
GND
1Y8
1Y9
1Y10
2Y1
2Y2
2Y3
GND
2Y4
2Y5
2Y6
VCC
2Y7
2Y8
GND
2Y9
2Y10
2OE1
s
t
u
p
n
I
s
t
u
p
t
u
O
E
O
1
E
O
2
A
Y
L
L
L
L
L
L
H
H
H
X
X
Z
X
H
X
Z
Pin Name
Description
OE
Output Enable Input (Active LOW)
Ax
Data Inputs
Yx
3-State Outputs
GND
Ground
V
CC
Power
Product Pin Description
Truth Table
(1)
Product 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
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
25
26
27
28
32
31
30
29
56-PIN
V56
A56
1OE2
1A1
1A2
GND
1A3
1A4
VCC
1A5
1A6
1A7
GND
1A8
1A9
1A10
2A1
2A2
2A3
GND
2A4
2A5
2A6
VCC
2A7
2A8
GND
2A9
2A10
2OE2
PI74ALVCH162827
20-Bit Buffer Driver with 3-STATE Outputs
3
PS8095B 10/07/98
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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
+4.6V
Output Voltage Range, V
OUT .............................................
0.5V to V
CC
+0.5V
DC Input Voltage ................................................................... 0.5V to +5.0V
DC Output Current................................................................................ 50 mA
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. Exposure 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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1
PI74ALVCH162827
20-Bit Buffer Driver with 3-STATE Outputs
4
PS8095B 10/07/98
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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, T
A
= 25C
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6
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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