PI74FCT3244
Fast CMOS 3.3V 8-Bit
Buffer/Line Driver
Features
•
•
•
•
•
•
•
•
•
Advanced Low Power CMOS operation
Compatible with LVC class of products
Compatible with industry standard octal pinouts
Excellent output drive capability:
Balanced Drives (24mA sink and source)
Can serve as a 5V to 3V translator
Inputs can be driven by 3.3 V or 5V devices
Low ground bounce outputs
Hysteresis on all inputs
Industrial operating temperature range:
Description
The PI74FCT3244 is an 8-bit buffer/line driver designed for
driving high capacitive memory loads. With its balanced-drive
characteristics, this high-speed, low power device provides lower
ground bounce, transmission line matching, fewer line reflections
and lower EMI and RFI. This makes it ideal for driving on-board
buses and transmission lines.
The PI74FCT3244 can be driven from either 3.3V or 5.0V devices
allowing this device to be used as a translator.
–40°C to +85°C
• Packaging (
Pb-free & Green available)
:
– 20-pin 173-mil wide plastic TSSOP (L)
– 20-pin 150-mil wide plastic QSOP (Q)
– 20-pin 300-mil wide plastic SOIC (S)
Block Diagram
OE
A
OE
B
D
A
0
O
B
0
D
A
1
O
B
1
D
A
2
O
B
2
D
A
3
O
B
3
O
A
0
D
B
0
O
A
1
D
B
1
O
A
2
D
B
2
O
A
3
D
B
3
Pin Configuration
OE
A
D
A
0
O
B
0
D
A
1
O
B
1
D
A
2
O
B
2
D
A
3
O
B
3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
OE
B
O
A
0
D
B
0
O
A
1
D
B
1
O
A
2
D
B
2
O
A
3
D
B
3
GND
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PS7067I
06/20/06
PI74FCT3244
3.3V 8-Bit Buffer/Line Driver
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature .............................................................. –65°C to +150°C
Ambient Temperature with Power Applied ............................. –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & V
CC
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 RAT-
INGS 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 ex-
tended periods may affect reliability.
Truth Table
(1)
OE
A
L
L
H
Inputs
OE
B
L
L
H
D
XX
L
H
X
Outputs
O
XX
L
H
Z
Pin Description
Pin Name
OE
A
, OE
B
D
XX
O
XX
GND
V
CC
Description
3-State Output Enable
Inputs (Active LOW)
Inputs
Outputs
Ground
Power
Note:
1. H = High Voltage Level, X = Don’t Care,
L = Low Voltage Level, Z = High Impedance
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PS7067I
06/20/06
PI74FCT3244
3.3V 8-Bit Buffer/Line Driver
DC Electrical Characteristics
(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
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
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
=
Max.
V
CC
=
Max.
V
CC
=
Max.
V
CC
=
Max.
V
CC
= Max.
V
CC
= Max.
V
IN
= 5.5V
V
IN
= V
CC
V
IN
= GND
V
IN
= GND
V
OUT
= 5.5V
V
OUT
= GND
–0.7
–36
50
V
CC
-0.2
2.4
2.4
(5)
2.0
0.2
0.2
0.3
–60
–85
150
0.4
0.5
–240
±100
mA
µA
mV
3.0
3.0
V
–60
90
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
200
V
µA
V
Units
V
CC
=
Min.,
I
IN
= –18mA
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
V
CC
= 3.0V,
V
IN
= V
IH
or V
IL
V
CC
=
Min.,
V
IN
= V
IH
or V
IL
I
OH
= –0.1mA
I
OH
= –3mA
I
OH
= –8mA
I
OH
= –24mA
I
OL
= 0.1mA
I
OL
= 16mA
I
OL
= 24mA
V
OH
Output HIGH Voltage
V
OL
I
OS
I
OFF
V
H
Output LOW Voltage
Short Circuit Current
(4)
Power Down Disable
Input Hysteresis
V
CC
=
Max.
(3)
, V
OUT
= GND
V
CC
=
0V, V
IN
or
V
OUT
≤
4.5V
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.
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. Determined by device characterization.
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PS7067I
06/20/06
PI74FCT3244
3.3V 8-Bit Buffer/Line Driver
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
Description
Quiescent Power
Supply Current
Quiescent Power
Supply Current, TTL
Inputs HIGH
Dynamic Power
Supply
(4)
V
CC
=
Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
OE
X
= GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50%
Duty Cycle
OE
X
= GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50%
Duty Cycle
OE
X
= GND
8 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
Units
Μ
A
µA
I
CCD
V
IN
= V
CC
V
IN
= GND
95
100
µA/
MHz
V
IN
= V
CC
– 0.6V
V
IN
= GND
0.97
2.3
I
C
Total Power Supply
Current
(6)
mA
V
IN
= V
CC
– 0.6V
V
IN
= GND
4.7
(5)
1.9
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 3.3V,
T
A
=+25°C.
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 I
CC
formula. These limits are guaranteed but not tested.
6.
I
C
=I
QUIECSENT
+ 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
06-0218
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PS7067I
06/20/06
PI74FCT3244
3.3V 8-Bit Buffer/Line Driver
Switching Characteristics over Operating Range
(1)
FCT3244
Parameters
t
PHL
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SK
(o)
Description
Conditions
Com.
Min.
(2)
Propagation Delay,
D
XX
to
O
XX
Output Enable Time, OE
X
to O
XX
Output Disable Time, OE
X
to O
XX
Output Skew
(3)
C
L
= 50pF
R
L
= 500
Ω
1.5
1.5
1.5
Max.
4.1
5.8
5.2
0.5
ns
Units
Notes:
1. Propagation Delays and Enable/Disable times are with V
CC
= 3.3V ± 0.3V, normal range. At V
CC
= 2.7V, all Propagation Delay and Enable/
Disable times are degraded by 20%.
2. Minimum limits are guaranteed by design and characterization.
3. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by
design and characterization.
Packaging Mechanical:
20-pin TSSOP (L)
½½
½½½½
½½½½
½½½
½½½
½
½½½½
½½½½½½
½½½
½½½
½½½½
½½½½
½½½½
½½½½½
½½½½
½½½½
½½½
½½½½½½½
½½½½½
½½½½
½½½½
½½½½
½½½½
½½½½
½½½½
½½½½½
½½½
½½½½
½½½½
½½½½
½½½½
½½½½
½½½½
½½½½
½½½½
½½½½
½½½
½½½
06-0218
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PS7067I
06/20/06
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