PI74FCT244T/2244T
PI74FCT541T/2541T
Fast CMOS Octal Buffer/Line Drivers
Features
•
PI74FCT244/541T and PI74FCT2244/2541T are pin
compatible with bipolar Fast Series at a higher speed and
lower power consumption
•
25Ω series resistor on all outputs (FCT2XXX only)
•
TTL input and output levels
•
Low ground bounce outputs
•
Extremely low static power
•
Hysteresis on all inputs
•
Industrial operating temperature range: –40°C to +85°C
•
Packaging (Pb-free & Green available):
– 20-pin 173-mil wide plastic TSSOP (L)
– 20-pin 209-mil wide plastic SSOP (H)
– 20-pin 150-mil wide plastic QSOP (Q)
– 20-pin 150-mil wide plastic TQSOP (R)
– 20-pin 300-mil wide plastic SOIC (S)
•
Device models available upon request
Description
Pericom Semiconductor’s PI74FCT244T/541T and P174FCT2244/
2541T are 8-bit wide driver circuits, designed to be used in
applications requiring high-speed and high-output drive. Ideal
applications would include bus drivers, memory drivers, address
drivers, and system clock drivers.
The PI74FCT541 and 2541T provide similar driver capabilities,
but have their pins physically grouped by function. All inputs are
located on one side of the package, while outputs are on the opposite
side, allowing for a much simpler and denser board layout.
All PI74FCT2XXX devices have a built-in 25Ω series resistor on
all outputs to reduce noise because of reflections, thus eliminating
the need for an external terminating resistor.
Block Diagrams
PI74FCT244/2244T
OE
A
OE
B
*
DA
0
OB
0
DA
1
OB
1
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
PI74FCT541/2541T
OE
A
OE
B
D
0
O
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
O
1
O
2
O
3
DA
2
OB
2
DA
3
OB
3
O
4
O
5
O
6
O
7
*
OE
B
for 244T,
1
PS2011C
09/22/04
PI74FCT244T/2244T
PI74FCT541T/2541T
Octal Buffer/Line Drivers
Product Pin Description
Pin Name
OEA, OEB
OEB
(1)
Dxx
Oxx
GND
V
CC
Description
3-State Output Enable Inputs (Active LOW)
3-State Output Enable Input (Active HIGH)
Inputs
Outputs
Ground
Power
Truth Table
OE
A
L
L
H
Inputs
(1)
OE
B
OE
B
(2)
L
H
L
H
H
L
Outputs
(1)
D
L
H
X
244
L
H
Z
541
L
H
Z
Note:
1. H = High Voltage Level, X = Don't Care, L = Low
Voltage Level, Z = High Impedance
2. OE
B
for 241 only.
PI74FCT241/2241/244/2244T Pin Configuration
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
PI74FCT540/541/2541T Pin Configuration
OE
A
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
1
2
20-Pin
3
H20
4
L20
5
P20
6
7
Q20
R20
8
S20
9
10
20
19
18
17
16
15
14
13
12
11
20-Pin
H20
L20
P20
Q20
R20
S20
Vcc
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
Vcc
OE
B
O
0
*
O
1
*
O
2
*
O
3
*
O
4
*
O5*
O
6
*
O
7
*
2
PS2011D
09/22/04
PI74FCT244T/2244T
PI74FCT541T/2541T
Octal Buffer/Line Drivers
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 & 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................................................................................ 120mA
Power Dissipation .................................................................................... 0.5W
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 con-
ditions 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, TA = –40°C to +85°C, VCC = 5.0V ± 5%)
Parameters
V
OH
V
OL
V
OL
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
OFF
I
OS
V
H
Description
Output HIGH Voltage
Output LOW Current
Output LOW Current
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance
Output Current
Clamp Diode Voltage
Power Down Disable
Short Circuit Current
Input Hysteresis
Test Conditions
(1)
V
CC
= Min.,
V
IN
= V
IH
or
V
IL
V
CC
= Min.,
V
IN
= V
IH
or
V
IL
V
CC
= Min.,
V
IN
= V
IH
or
V
IL
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
=
Max.
V
CC
=
Max.
V
CC
= M
AX
.
V
CC
=
Min.,
I
IN
= –18mA
V
CC
=
GND,
V
OUT
= 4.5V
V
CC
=
Max.
(3)
, V
OUT
= GND
—
–60
V
IN
= V
CC
V
IN
= GND
V
OUT
= 2.7V
V
OUT
= 0.5V
–0.7
—
–120
200
I
OH
= –15.0mA
I
OL
= 64mA
I
OL
= 12mA
(25ΩSeries)
2.0
0.8
1
–1
1
–1
–1.2
100
V
µA
mA
µA
Min.
2.4
Typ
(2)
3.0
0.3
0.3
0.55
0.50
V
Max.
Units
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max.
10
12
Units
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 = 5.0V, +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 determined by device characterization but is not production tested.
3
PS2011D
09/22/04
PI74FCT244T/2244T
PI74FCT541T/2541T
Octal Buffer/Line Drivers
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
Description
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
V
CC
=
Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
OE
A
= OE
B
= GND or
OE
A
= GND, OE
B
= V
CC
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50%
Duty Cycle
OE
A
= OE
B
= GND or
OE
A
= GND, OE
B
= V
CC
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50%
Duty Cycle
OE
A
= OE
B
= GND or
OE
A
= GND, OE
B
= V
CC
Eight Bits Toggling
Test Conditions
(1)
V
IN
= GND
or
V
CC
V
IN
= 3.4V(3)
Min.
Typ
(2)
0.1
0.5
Max.
500
2.5
Units
µA
mA
I
CCD
Supply Current per
Input per MHz(4)
V
IN
= V
CC
V
IN
= GND
0.15
0.25
mA/
MHz
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
1.5
3.5(5)
1.8
4.5
(5)
mA
I
C
Total Power Supply
Current(6)
3.0
6.0(5)
5.0
14.0(5)
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); 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
ΔI
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
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)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
4
PS2011D
09/22/04
PI74FCT244T/2244T
PI74FCT541T/2541T
Octal Buffer/Line Drivers
PI74FCT244/2244T Switching Characteristics over Operating Range
Param-
eters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
Description
Propagation Delay
Output Enable Time
OE
X
to
O
N
Output Disable
Time
(3)
OE
X
to
O
N
Condi-
tions
(1)
244T/2244T
Com.
Min
1.5
Max
6.5
8.0
7.0
244AT/2244AT
Com.
Min
1.5
1.5
1.5
Max
4.8
6.2
5.6
244CT/2244CT
Com.
Min
1.5
1.5
1.5
Max
4.1
5.8
5.2
244DT
Com.
Min
1.5
1.5
1.5
Max
3.6
4.8
4.0
Units
ns
ns
ns
C
L
= 50pF
1.5
1.5
PI74FCT541/2541T Switching Characteristics over Operating Range
541T/2541T
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
D
N
to
O
N
Output Enable Time
OE
X
to
O
N
Output Disable
Time
(3)
OE
X
to
O
N
C
L
= 50pF
R
L
= 500Ω
Conditions
(1)
Com.
Min
1.5
1.5
1.5
Max
6.0
9.5
6.5
541AT/
2541AT
Com.
Min
1.5
1.5
1.5
Max
4.8
6.2
5.6
541CT/
2541CT
Com.
Min
1.5
1.5
1.5
Max
4.1
5.8
5.2
541DT
Com.
Min
1.5
1.5
1.5
Max
3.8
5.2
5.2
ns
ns
ns
Units
Notes:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
5
PS2011D
09/22/04
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