PI74LPT16245
Fast CMOS 3.3V 16-Bit
Bidirectional Transceiver
Product Features
•
•
Compatible with LCX™ and LVT™ families of products
Supports 5V Tolerant Mixed Signal Mode Operation
– Input can be 3V or 5V
– Output can be 3V or connected to 5V bus
Advanced Low Power CMOS Operation
Excellent output drive capability:
Balanced drives (24 mA sink and source)
Pin compatible with industry standard double-density pinouts
Low ground bounce outputs
Hysteresis on all inputs
Industrial operating temperature range: –40°C to +85°C
Multiple center pins and distributed Vcc/GND pins minimize
switching noise
Packaging (Pb-free & Green available):
– 48-pin 240 mil wide thin plastic TSSOP (A)
– 48-pin 300 mil wide plastic SSOP (V)
Product Description
The PI74LPT16245 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
fl
ow 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.
The PI74LPT16245 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.
•
•
•
•
•
•
•
•
Logic Block Diagram
1
DIR
2
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
08-0291
1
PS2068F
11/10/08
PI74LPT16245
3.3V 16-Bit Bidirectional Transceiver
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ............................................................. –55°C to +125°C
Ambient Temperature with Power Applied ............................ –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ...... –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ... –0.5V to +7.0V
DC Input Voltage ..................................................................... –0.5V to +7.0V
DC Output Current............................................................................... 120 mA
Power Dissipation .................................................................................... 1.0W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional op-
eration of the device at these or any other conditions
above those indicated in the op er a tion al sec tions
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may af-
fect reliability.
Product Pin Configuration
1
DIR
1
B
0
1
B
1
Truth Table
(1)
Inputs
48
47
46
45
44
43
42
41
40
39
38
1
OE
1
A
0
1
A
1
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
17
18
19
20
21
22
23
24
X
OE
X
DIR
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
Z
L
L
H
L
H
X
GND
1
B
2
1
B
3
V
CC
1
B
4
1
B
5
GND
1
A
2
1
A
3
V
CC
1
A
4
1
A
5
Notes:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
GND
1
B
6
1
B
7
2
B
0
2
B
1
48-PIN
37
V48
13
A48
36
35
34
33
32
31
30
29
28
27
26
25
GND
1
A
6
1
A
7
2
A
0
2
A
1
Product Pin Description
Pin Name
xOE
xDIR
xAx
xYx
GND
V
CC
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
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
08-0291
2
PS2068F
11/10/08
PI74LPT16245
3.3V 16-Bit Bidirectional Transceiver
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ
4.5
5.5
Max.
6
8
Units
pF
Notes:
1. This parameter is determined by device characterization but is not production tested.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 2.7V to 3.6V)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
OHD
I
ODL
Description
Input HIGH Voltage (Input pins)
Input HIGH Voltage (I/O pins)
Input LOW Voltage
(Input and I/O pins)
Input HIGH Current (Input pins)
Input HIGH Current (I/O pins)
Input LOW Current (Input pins)
Input LOW Current (I/O pins)
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Min.
2.2
2.0
–0.5
Typ
(2)
Max.
5.5
5.5
0.8
±1
±1
±1
±1
±1
±1
–1.2
–110
mA
50
V
CC
-0.2
2.4
2.4
(5)
2.0
90
200
Units
V
V
OH
V
OL
I
OS
I
OFF
V
H
V
CC
= Max.
V
IN
= 5.5V
V
CC
= Max.
V
IN
= V
CC
V
CC
= Max.
V
IN
= GND
V
CC
= Max.
V
IN
= GND
V
OUT
= 5.5V
High Impedance Output Current V
CC
= Max.
(3-State Output pins)
V
CC
= Max.
V
OUT
= GND
Clamp Diode Voltage
V
CC
= Min., I
IN
= –18 mA
V
CC
= 3.3V, V
IN
= V
IL
or V
IL
,
Output HIGH Current
V
O
= 1.5V
(3)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
,
Output LOW Current
V
O
= 1.5V
(3)
I
OH
= –0.1 mA
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –3 mA
Output HIGH Voltage
V
CC
= 3.0V,
I
OH
= –8 mA
V
IN
= V
IH
or V
IL
I
OH
= –24 mA
I
OL
= 0.1 mA
V
CC
= Min.
I
OL
= 16 mA
Output LOW Voltage
V
IN
= V
IH
or V
IL
I
OL
= 24 mA
Short Circuit Current
(4)
V
CC
= Max.
(3)
, V
OUT
= GND –60
Power Down Disable
V
CC
= 0V, V
IN
or V
OUT
≤
4.5V
Input Hysteresis
μA
–0.7
–36
–60
V
3.0
3.0
V
0.2
0.3
–85
150
0.2
0.4
0.5
–240
±100
-60
mA
μA
mV
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. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= V
CC
– 0.6V at rated current.
08-0291
3
PS2068F
11/10/08
PI74LPT16245
3.3V 16-Bit Bidirectional Transceiver
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
Description
Quiescent Power Supply Current
Quiescent Power Supply Current
TTL Inputs HIGH
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
X
OE = GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = GND
16 Bits Toggling
Test Conditions
(1)
V
IN
= GND or V
CC
V
IN
= V
CC
– 0.6V
(3)
Min.
Typ
(2)
0.1
Max.
10
500
μA
Units
I
CCD
Dynamic Power Supply(4)
V
IN
= V
CC
V
IN
= GND
50
75
μA/
MHz
V
IN
= V
CC
– 0.6V
V
IN
= GND
0.5
0.8
I
C
Total Power Supply
Current(6)
mA
V
IN
= V
CC
– 0.6V
V
IN
= GND
3.3(5)
2.0
Notes:
1. ForMax. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 3.3V, +25°C ambient.
3. Per TTL driven input; all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
ΔI
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current (I
CCL
, I
CCH
and I
CCZ
)
ΔI
CC
= Power Supply Current for a TTL High Input
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
N
CP
= Number of Clock Inputs at f
CP
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
08-0291
4
PS2068F
11/10/08
PI74LPT16245
3.3V 16-Bit Bidirectional Transceiver
Switching Characteristics over Operating Range
(1)
LPT16245
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SK
(o)
Description
Propagation Delay
X
A
X
to
X
B
X
Output Enable Time
xOE to xBx
Output Disable Time
(4)
xOE to xBx
Output Enable Time xDIR
to A or B
Output DisableTime xDIR
to A or B
(4)
Output
Skew
(5)
C
L
= 50pF
R
L
= 500Ω
Conditions
(2)
Com.
Min
(3)
1.5
1.5
1.5
1.5
1.5
Max.
5.2
7.2
7.2
7.2
7.2
0.5
LPT16245A
Com.
Min
(3)
1.5
1.5
1.5
1.5
1.5
Max.
4.6
6.2
5.0
6.2
5.0
0.5
LPT16245C
Com.
Min
(3)
1.5
1.5
1.5
1.5
1.5
Max.
4.1
5.8
4.8
5.8
4.8
0.5
ns
Units
1
2
3
4
5
6
7
8
9
10
Notes:
1. Propagation Delays and Enable/Disable times are with Vcc = 3.3V ±0.3V, normal range. For Vcc = 2.7V, extended range, all Propagation Delays
and Enable/Disable times should be degraded by 20%.
2. See test circuit and wave forms.
3. Minimum limits are guaranteed but not tested on Propagation Delays.
4. This parameter is guaranteed but not production tested.
5. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
DOCUMENT CONTROL NO.
PD - 1501
REVISION: G
DATE: 03/09/05
48
.236
.244
6.0
6.2
See Note 4
1
.488
12.4
.496
12.6
See Note 3
.047
1.20 Max
SEATING PLANE
11
.004
0.09
.008
0.20
12
13
14
1
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.0197
BSC
0.50
.007
.010
0.17
0.27
.002
.006
0.05
0.15
0.45 .018
0.75 .030
.319
BSC
8.1
Note:
1. Controlling dimensions in millimeters.
2. Ref: JEDEC MO-153F/ED
3.
Dimension does not include mold flash, protrusions or gate burrs. Mold flash, protru-
sions and gate burrs shall not exceed 0.15mm per side.
4. Dimension does not include interlead flash or protrusion. Interlead flash or protrusion
shall not exceed 0.25mm per side.
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335
• www.pericom.com
DESCRIPTION: 48-Pin 240-Mil Wide TSSOP
PACKAGE CODE: A
15
08-0291
5
PS2068F
11/10/08
京公网安备 11010802033920号
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