21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16L245
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 (6 mA sink and source)
Pin compatible with industry standard double-density
pinouts
Low Noise, overshoot/undershoot, ±1V Max.
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
Packages available:
– 48-pin 240 mil wide thin plastic TSSOP (A)
– 48-pin 300 mil wide plastic SSOP (V)
Product Description
Pericom Semiconductor’s PI74LPT series of logic circuits are pro-
duced using the Company’s advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74LPT16L245 is a low noise 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.
The PI74LPT16L245 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
1
PS8607
03/12/02
Product Pin Configuration
1
DIR
1
B
0
1
B
1
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16L245
3.3V 16-Bit BiDirectional Transceiver
Product Pin Description
Pin Name
xOE
xDIR
xAx
xBx
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
Truth Table
Inputs
(1)
X
OE
L
L
H
xDIR
L
H
X
Outputs
(1)
Bus B Data to Bus A
Bus A Data to Bus B
Z
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
1
2
3
4
5
6
7
8
9
10
11
12
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
1
OE
1
A
0
1
A
1
GND
1
B
2
1
B
3
GND
1
A
2
1
A
3
V
CC
1
B
4
1
B
5
V
CC
1
A
4
1
A
5
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
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
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0 V
V
OUT
= 0 V
Typ
4.5
5.5
Max.
6
8
Units
pF
pF
Note:
1. This parameter is determined by device characterization but is not production tested.
2
PS8607
03/12/02
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16L245
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 opera-
tion 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
= –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
ODH
I
ODL
V
OH
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)
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Output HIGH Current
Output LOW Current
Output HIGH Voltage
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
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
CC
= Max.
V
OUT
= 5.5V
V
CC
= Max.
V
OUT
= GND
V
CC
= Min., I
IN
= –18 mA
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
V
CC
= Min. ,V
IN
= V
IH
or V
IL
I
OH
= –0.1 mA
V
CC
= 3.0V,
I
OH
= –6 mA
V
IN
= V
IH
or V
IL
I
OH
= –12 mA
V
CC
= Min.
I
OL
= 0.1 mA
V
IN
= V
IH
or V
IL
I
OL
= 6 mA
(3)
V
CC
= Max. , V
OUT
= GND
V
CC
= 0V, V
IN
or V
OUT
≤
4.5V
Min.
2.2
2.0
–0.5
—
—
—
—
—
—
—
–15
20
Vcc-0.2
2.4
(5)
2.0
—
—
–30
—
—
Typ
(2)
—
—
—
—
—
—
—
—
—
–0.7
–28
30
2.6
—
—
0.3
–56
—
150
Max.
5.5
5.5
0.8
±1
±1
±1
±1
±1
±1
–1.2
–60
60
—
—
0.2
0.5
–120
±100
—
Units
V
V
V
µA
µA
µA
µA
µA
µA
V
mA
mA
V
V
V
mA
µA
m
V
V
OL
I
OS
I
OFF
V
H
Output LOW Voltage
Short Circuit Current
(4)
Power Down Disable
Input Hysteresis
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.
3
PS8607
03/12/02
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16L245
3.3V 16-Bit BiDirectional Transceiver
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
Quiescent Power Supply Current
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
IN
= GND or V
CC
V
IN
= V
CC
– 0.6V
(3)
Min.
Typ
(2)
0.1
2.0
50
Max.
10
30
75
Units
µA
µA
µA/
MHz
V
CC
= Max.,
V
IN
= V
CC
Outputs Open
V
IN
= GND
X
OE = xDIR = GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
V
IN
= V
CC
– 0.6V
Outputs Open
V
IN
= GND
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
One Bit Toggling
V
CC
= Max.,
V
IN
= V
CC
– 0.6V
Outputs Open
V
IN
= GND
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
16 Bits Toggling
I
C
Total Power Supply
Current
(6)
0.5
0.8
mA
2.0
3.3
(5)
Notes:
1. For Max. or Min. condition, 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
+
∆I
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
)
∆I
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.
4
PS8607
03/12/02
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16L245
3.3V 16-Bit BiDirectional Transceiver
Switching Characteristics over Operating Range
(1)
LPT16L245
Com.
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
A to B, B to A
Output Enable Time
xOE to A or B
Output Disable Time
(4)
xOE to A or B
Output Enable Time
xDIR to A or B
Output Disable Time
xDIR to A or B
(4)
Output Skew
(5)
Conditions
(2)
C
L
= 50 pF
R
L
= 500Ω
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
1.5
1.5
1.5
1.5
1.5
LPT16L245A
Com.
Min.
(3)
Max.
4.6
6.2
5.0
6.2
5.0
0.5
1.5
1.5
1.5
1.5
1.5
LPT16L245C
Com.
Min.
(3)
Max.
5.5
(6)
5.8
4.8
5.8
4.8
0.5
Units
ns
ns
ns
ns
ns
ns
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.
6. All bits switching with 80pF C
L
.
Noise Characteristics
Parame te rs
OS
US
De s cription
Overshoot
Undershoot
Conditions
C
L
= 20pF
LPT16L245
+1V Max.
1V Max.
Units
V
V
5
PS8607
03/12/02
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