PI74ALVCHT16245
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
3.3V 16-Bit Bidirectional Transceiver
with 3-State Output
Product Features
•
PI74ALVCHT16245 is designed for low voltage operation
•
V
CC
= 2.3V to 3.6V
•
5V I/O Tolerant
•
Hysteresis on all inputs
•
Typical V
OLP
(Output Ground Bounce)
< 0.8V at V
CC
= 3.3V, T
A
= 25°C
•
Typical V
OHV
(Output V
OH
Undershoot)
< 2.0V at V
CC
= 3.3V, T
A
= 25°C
•
Bus Hold retains last active bus state during 3-state
eliminating the need for external pull-up 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)
Product Description
Pericom Semiconductors PI74ALVCH series of logic circuits are
produced in the Companys advanced 0.5 micron CMOS technology,
achieving industry leading speed grades.
The PI74ALVCHT16245 is a 16-bit bidirectional transceiver designed
for asynchronous two-way communication between data buses.
The direction control input pin (xDIR) determines the direction of
data flow through the bidirectional transceiver. The Direction and
Output Enable controls are designed to operate this device as either
two independent 8-bit transceivers or one 16-bit transceiver. The
output enable (OE) input, when HIGH, disables both A and B ports
by placing them in HIGH Z condition.
To ensure the high-impedance state during power up or power
down, OE should be tied to Vcc through a pull-up resistor; the
minimum value of the resistor is determined by the current sinking
ability of the driver.
The PI74ALVCHT16245 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 PI74ALVCHT16245 can be driven from either 3.3V or 5.0Vdevices
allowing this device to be used as a translator in a mixed 3.3/5.0V
system.
2
DIR
Logic Block Diagram
1
DIR
1
OE
2
OE
1
A
0
1
B
0
1
A
1
1
B
1
1
A
2
1
B
2
1
A
3
1
B
3
1
A
4
1
B
4
1
A
5
1
B
5
1
A
6
1
B
6
1
A
7
1
B
7
2
A
0
2
B
0
2
A
1
2
B
1
2
A
2
2
B
2
2
A
3
2
B
3
2
A
4
2
B
4
2
A
5
2
B
5
2
A
6
2
B
6
2
A
7
2
B
7
1
PS8308
07/30/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCHT16245
3.3V 16-Bit Bidirectional Transceiver
with 3-State Outputs
Product Pin Description
Pin Name
xOE
xDIR
X
A
X
X
B
X
Truth Table
(1)
Inputs
(1)
xOE
L
L
H
xDIR
L
H
X
Outputs
(1)
Bus B Data to Bus A
Bus A Data to Bus B
Z
Description
3-State Output Enable Inputs (Active LOW)
Direction Control Input
Side A Inputs or 3-State Inputs
Side B Outputs or 3-State Outputs
Ground
Power
GND
V
CC
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
Product Pin Configuration
1
DIR
1
B
0
1
B
1
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
48
47
46
45
44
43
1
OE
1
A
0
1
A
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48-PIN
V48
A48
GND
1
B
2
1
B
3
GND
1
A
2
1
A
3
V
CC
1
B
4
1
B
5
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
V
CC
1
A
4
1
A
5
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, V
OUT
.................................... 0.5V to +6.0V
DC Input Voltage ....................................................... 0.5V to +6.0V
DC Output Current ................................................................. 50 mA
Power Dissipation ..................................................................... 1.0W
GND
1
B
6
1
B
7
2
B
0
2
B
1
GND
1
A
6
1
A
7
2
A
0
2
A
1
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.
GND
2
B
2
2
B
3
GND
2
A
2
2
A
3
V
CC
2
B
4
2
B
5
V
CC
2
A
4
2
A
5
GND
2
B
6
2
B
7
2
DIR
GND
2
A
6
2
A
7
2
OE
2
PS8308
07/30/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCHT16245
3.3V 16-Bit Bidirectional Transceiver
with 3-State Outputs
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 3.3V ± 10%)
Parame te rs
V
CC
V
IH
(3)
V
IL
(3)
V
IN
(3)
V
OUT
(3)
De s cription
Supply Voltage
Input HIGH Voltage
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
0
0
I
OH
= - 100
µ
A, V
CC
= Min. to Max.
V
IH
= 1.7V, I
OH
= - 6mA, V
CC
= 2.3V
V
OH
Output HIGH Voltage
V
IH
= 1.7V, I
OH
= - 12mA, V
CC
= 2.3V
V
IH
= 2.0V, I
OH
= - 12mA, V
CC
= 2.7V
V
IH
= 2.0V, I
OH
= - 12mA, V
CC
= 3.0V
V
IH
= 2.0V, I
OH
= - 24mA, V
CC
= 3.0V
I
OL
= 100
µ
A, V
IL
= Min. to Max.
V
IL
= 0.7V, I
OL
= 6mA, V
CC
= 2.3V
V
OL
Output LOW Voltage
V
IL
= 0.7V, I
OL
= 12mA, V
CC
= 2.3V
V
IL
= 0.8V, I
OL
= 12mA, V
CC
= 2.7V
V
IL
= 0.8V, I
OL
= 24mA, V
CC
= 3.0V
V
CC
= 2.3V
I
OH
(3)
Output HIGH Current V
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 2.3V
I
OL
(3)
Output LOW Current
V
CC
= 2.7V
V
CC
= 3.0V
I
IN
Input Current
V
IN
= V
CC
or GND, V
CC
= 3.6V
V
IN
= 0.8V, V
CC
= 3.0V
I
IN
(
HOLD
)
Input Hold Current
V
IN
= 2.0V, V
CC
= 3.0V
V
IN
= 0 to 3.6V, V
CC
= 3.6V
I
OZ
Icc
∆
Icc
C
I
C
IO
Output Current
(3- State Outputs)
Supply Current
Supply Current per
Input @ TTL HIGH
Control Inputs
A or B Ports
V
OUT
= 5.5V or GND, V
CC
= 3.6V
V
CC
= 3.6V, I
OUT
= 0
µ
A,
V
IN
= GND or V
CC
V
CC
= 3.0V to 3.6V
One Input at V
CC
- 0.6V
Other Inputs at V
CC
or GND
V
IN
= V
CC
or GND, V
CC
= 3.3V
V
O
= V
CC
or GND, V
CC
= 3.3V
4
7
75
- 75
±500
±10
40
750
µA
V
CC
- 0.2
2.0
1.7
2.2
2.4
2.0
0.2
0.4
0.7
0.4
0.55
- 12
- 12
- 24
12
12
24
±5
mA
V
Te s t Condition
(1)
M in.
2.3
1.7
2.0
Typ
(2)
M ax.
3.6
5.5
5.5
0.7
0.8
5.5
5.5
Units
Input LOW Voltage
Input Voltage
Output Voltage
pF
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.
3
PS8308
07/30/98
Switching Characteristics over Operating Range
(1)
From
(INPUT)
A or B
OE
OE
To
(OUTPUT)
B or A
B or A
B or A
Description
∆
t/
∆v
( 3 )
Input Transition Rise or Fall
0
10
0
10
0
10
ns/V
V
CC
= 2.5V ± 0.2V
M in.
(2)
1.0
1.0
1.0
M ax.
5.0
6.8
6.0
V
CC
= 2.7V
M in.
(
2)
M ax.
4.0
6.0
5.2
V
CC
= 3.3V ± 0.3V
M in.
(2)
1.0
1.0
1.0
M ax.
3.6
5.0
5.0
ns
Units
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCHT16245
3.3V 16-Bit Bidirectional Transceiver
with 3-State Outputs
Parame te rs
t
P D
t
E N
t
D I S
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. Recommended operating condition.
Operating Characteristics, T
A
= 25°C
Parame te rs
C
PD
Power Dissipation O utputs Enabled
Capacitance
O utputs Disabled
Te s t Conditons
C
L
= 50pF,
f = 10 MHz
V
CC
= 2.5V ± 0.2V
Typical
22
4
V
CC
= 3.3V ± 0.3V
Typical
29
5
Units
pF
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
4
PS8308
07/30/98
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