21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74VCX16245
2.5V 16-Bit Bidirectional Transceiver
with 3-State Outputs
Product Features
•
The PI74VCX family is designed for low voltage operation
V
DD
= 1.8V to 3.6V
•
•
•
•
3.6V I/O Tolerant Inputs and Outputs
Supports Live Insertion
Balanced output drive, ±24mA
Uses patented Noise Reduction Circuitry
Product Description
Pericom Semiconductors PI74VCX series of logic circuits are
produced in the Companys advanced 0.35 micron CMOS
technology, achieving industry leading speed.
The PI74VCX16245 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 PI74VCX family is I/O Tolerant, allowing it to operate in
mixed 1.8V/3.6V systems.
•
Typical V
OLP
(Output Ground Bounce)
< 0.6V at V
DD
= 2.5V, T
A
= 25ºC
•
Typical V
OHV
(Output V
OH
Undershoot)
< -0.6V at V
DD
= 2.5V, T
A
= 25ºC
•
Power-Off High Impedance inputs and outputs
•
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)
Logic Block Diagram
1DIR
1OE
1A
0
1B
0
1A
1
1B
1
1A
2
1B
2
1A
3
1B
3
1A
4
1B
4
1
A
5
2
A
6
2
A
5
2
B
4
2
A
4
2
B
3
2
A
3
2
B
2
2
A
1
2
B
1
2
DIR
2
OE
2
A
0
2
B
0
1B
5
1A
6
1B
6
1A
7
1B
7
2
A
8
2
A
7
2
B
5
2
B
6
2
B
7
1
PS8325
09/14/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74VCX16245
2.5V 16-Bit Bidirectional Transceiver with 3-State Outputs
Truth Table
(1)
Product Pin Description
Pin Name
xO E
xDIR
xAx
xBx
GND
V
CC
D e s cription
3- STATE O utput Enable Inputs (Active LO W)
Direction Control Input
Side A Inputs or 3- STATE Inputs
Side B Inputs or 3- STATE O utputs
Ground
Power
Inputs
(1)
xOE
L
L
H
xDIR
L
H
X
Outputs
(1)
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
Notes:
1. H = High Signal Level
L = Low Signal Level
X = Don’t Care or Irrelevant
Z = High Impedance
Product Pin Configuration
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
47
46
1DIR
1B0
1B1
GND
1B2
1B3
VCC
1B4
1B5
GND
1B6
1B7
2B0
2B1
GND
2B2
2B3
VCC
2B4
2B5
GND
2B6
2B7
2DIR
1OE
1A0
1A1
GND
1A2
1A3
VCC
1A4
1A5
GND
1A6
1A7
2A0
2A1
GND
2A2
2A3
VCC
2A4
2A5
GND
2A6
2A7
2OE
48-PIN
A48
V48
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
2
PS8325
09/14/98
PI74VCX16245
2.5V 16-Bit Bidirectional Transceiver with 3-State Outputs
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Supply Voltage Range, V
DD ................................................
–0.5V to 4.6V
Input Voltage Range, V
I .........................................................
-0.5V to 4.6V
Output Voltage Range, V
O
(3-Stated) .......................... -0.5V to 4.6V
Output Voltage Range, V
O(1)
(Active) ............ –0.5V to V
DD
+ 0.5V
DC Input Diode Current (I
IK
) V
I
< 0V .................................... -50mA
DC Output Diode Current (I
OK
)
V
O
< 0V ................................................................................ -50mA
V
O
> V
DD ............................................................................................
-50mA
DC Output Source/Sink Current (I
OH
/I
OL
) ............................ ±50mA
DC V
DD
or GND Current per Supply Pin (I
CC
or GND) .... ±100mA
Storage Temperature Range, T
STG
............................ –65°C to150°C
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 indi-
cated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions
f
o
r
extended periods may affect reliability.
Recommended Operating Conditions
(2)
Parame te rs
V
DD
V
I
V
O
Supply voltage
Input voltage
Output voltage
Active State
Off State
V
DD
= 3.0V to 3.6V
V
DD
= 2.3V to 2.7V
V
DD
= 1.8V
0
-
40
De s cription
Operating
Data Retention Only
M in.
1.8
1.2
- 0.3
0
0
M ax.
3.6
3.6
3.6
V
DD
3.6
±24
±18
±6
10
85
mA
ns/V
ºC
V
Units
Output current in I
OH
/I
OL
D
t/
Dv
T
A
Input transistion rise or fall rate
(3)
Operating free- air temperature
Notes:
1. Absolute maximum of I
O
must be observed
2. Unused control inputs must be held HIGH or LOW to prevent them from floating
3. As measured between 0.8V and 2.0V, V
DD
= 3.0V
3
PS8325
09/14/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74VCX16245
2.5V 16-Bit Bidirectional Transceiver with 3-State Outputs
Electrical Characteristics over Recommended Operating Free-Air Temperature Range
(unless otherwise noted)
DC Characteristics (2.7V < V
DD
≤
3.6V)
Parame te rs
V
IH
V
IL
D e s cription
HIGH Level Input Voltage
LOW Level Input Voltage
I
OH
=
-
100
mA
V
OH
HIGH Level
Output Voltage
I
OH
=
-
12mA
I
OH
=
-
18mA
I
OH
=
-
24mA
I
OL
= 100
mA
V
OL
LOW Level
Output Voltage
I
OL
= 12mA
I
OL
= 18mA
I
OL
= 24mA
I
I
I
OZ
I
OFF
I
DD
DI
DD
Input Leakage Current
3- STATE
O utput Leakage
Power- O FF
Leakage Current
Q uiescent Supply Current
Increase in I
DD
per input
OV
£
V
I
£ 3.6
V
0
£
V
O
£
3.6V
V
I
= V
IH
or V
IL
0
£
(V
I
,V
O
)
£
3.6V
V
I
= V
DD
to GND
V
DD
£
(V
I
,V
O
)
£
3.6V
V
IH
= V
DD
- 0.6V,
Other inputs at V
DD
or GND
2.7 - 3.6
2.7 - 3.6
2.7 - 3.6
0
2.7
3.0
2.7 - 3.6
2.7
3.0
2.7 - 3.6
V
DD
- 0.2
2.2
2.4
2.2
0.2
0.4
0.4
0.55
±5.0
±10
10
20
±20
750
V
Conditions
V
DD
M in.
2.0
0.8
Typ.
M ax.
Units
mA
4
PS8325
09/14/98
PI74VCX16245
2.5V 16-Bit Bidirectional Transceiver with 3-State Outputs
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
DC Characteristics
(2.3V
≤
V
DD
≤
2.7V)
Parame te rs
V
IH
V
IL
De s cription
HIGH Level Input Voltage
LOW Level Input Voltage
I
OH
= - 100
mA
V
OH
HIGH Level
Output Voltage
I
OH
= - 6mA
I
OH
= - 12mA
I
OH
= - 18mA
V
OL
I
I
I
OZ
I
OFF
I
DD
LOW Level
Output Voltage
Input Leakage Current
3- STATE Output Leakage
I
OL
= 100
mA
I
OL
= 12mA
I
OL
= 18mA
0V
£
V1
£
3.6V
0
£
V
O
£
3.6V
V
I
= V
IH
or V
IL
V
I
= V
DD
or GND
V
DD
£ (
V1, V0)
£ 3.6
V
2.3 - 2.7
2.3
2.3 - 2.7
2.3 - 2.7
0
2.3 - 2.7
2.3
2.3 - 2.7
V
DD
- 0.2
2.0
1.8
1.7
0.2
0.4
0.6
±5.0
±10
10
20
±20
mA
V
Conditions
V
DD
M in.
1.6
0.7
Typ.
M ax.
Units
Power- OFF Leakage Current 0
£
(V
I
,V
O
)
£
3.6V
Quiescent Supply Current
Electrical Characteristics over Recommended Operating Free-Air Temperature Range
DC Characteristics
(1.8V
≤
V
DD
≤
2.3V)
Parame te rs
V
IH
V
IL
V
OH
V
OL
I
I
I
OZ
I
OFF
I
DD
D e s cription
HIGH Level Input Voltage
LO W Level Input Voltage
HIGH Level O utput Voltage
I
OH
= - 100mA
I
OH
= - 6mA
I
OL
= 100mA
I
OH
= - 6mA
0V
£
V1
£
3.6V
0V
£
V0
£
3.6V
V
I
= V
IH
or V
IL
0
1.8
1.8
V
I
= V
DD
or GND
V
DD
£ (
V1,V0)
£
3.6V
1.8
Conditions
V
DD
1.8 - 2.3
M in.
0.7 x V
DD
0.2 x V
DD
V
DD
- 0.2
1.4
0.2
0.3
±5.0
±10
10
20
±20
mA
V
Typ.
M ax.
Units
LO W Level O utput Voltage
Input Leakage Current
3- State O utput Leakage
Power- O FF Leakage Current 0V
£ (
V1,V0)
£
3.6V
Q uiescent Supply Current
5
PS8325
09/14/98
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