PI74FCT240T/241T/
244T/540T/541T (25 ohmSeries)
PI74FCT2240T/2241T/2244T/2541T
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
Fast CMOS Octal
Buffer/Line Drivers
Product Features
•
PI74FCT240/241/244/540/541T and PI74FCT2240/2241/2244/
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
Packages available:
– 20-pin 173 mil wide plastic TSSOP (L)
– 20-pin 209 mil wide plastic SSOP (H)
– 20-pin 300 mil wide plastic DIP (P)
– 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
Product Description
Pericom Semiconductor’s PI74FCT series of logic circuits are
produced in the Company’s advanced 0.6/0.8 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXX devices have a built-in 25 ohm series resistor on
all outputs to reduce noise because of reflections, thus eliminating
the need for an external terminating resistor.
The PI74FCT240T/241T/244T/540T/541T and P174FCT2240T/
2241T/2244/2541T 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 PI74FCT540T and PI74FCT541/2541T 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.
Logic Block Diagrams
PI74FCT240/2240T
PI74FCT241/2241T
PI74FCT244/2244T
241 Only
OE
A
PI74FCT540T
PI74FCT541/2541T
OE
A
OE
B
OE
A
OE
B
DA
0
OE
B
*
DA
0
OA
0
OA
0
D
0
D
1
O
0
O
1
OB
0
DB
0
OA
1
OB
0
DB
0
OA
1
DA
1
OB
1
DA
1
OB
1
D
2
O
2
DB
1
OA
2
DB
1
OA
2
D
3
O
3
DA
2
OB
2
DA
2
OB
2
D
4
O
4
DB
2
OA
3
DB
2
OA
3
D
5
D
6
O
5
O
6
DA
3
OB
3
DA
3
OB
3
DB
3
DB
3
D
7
O
7
*
OE
B
for 241T,
*
OE
B
for 244T,
1
*Logic diagram shown for 540T.
541/2541T is the non-inverting option.
PS2011B
12/11/00
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
PI74FCT240/2240T Product Pin Configuration
OE
A
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
Vcc
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
PI74FCT241/2241/244/2244T Product 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 Product Pin Configuration
OE
A
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
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PI74FCT240T/241T/244T/540T/541T (25 ohm Series)
PI74FCT2240T/2241T/2244T/2541T
Octal Buffer/Line Drivers
Truth Table
Inputs
(1)
OE
A
L
L
H
OE
B
L
L
H
OE
B
(2)
H
H
L
D
L
H
X
H
L
Z
Outputs
(1)
240 241 244 540 541
L
H
Z
L
H
Z
H
L
Z
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.
1
20
2
19
20-Pin
18
3
H20
17
4
L20
16
5
P20
15
6
Q20
14
7
R20
13
8
S20
12
9
10
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
*OE
B
for 241T, OE
B
for 244T
20-Pin
H20
L20
P20
Q20
R20
S20
Vcc
OE
B
O
0
*
O
2
*
O
2
*
O
3
*
O
4
*
O5*
O
6
*
O
7
*
*Ox for 540T, Ox for 541T
2
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PI74FCT240T/241T/244T/540T/541T (25 ohm Series)
PI74FCT2240T/2241T/2244T/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 condi-
tions 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 Description
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
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
V
CC
= Min., I
IN
= –18mA
V
CC
= GND, V
OUT
= 4.5V
V
CC
= Max.
(3)
, V
OUT
= GND
—
–60
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
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
Min. Typ
(2)
Max. Units
2.4
3.0
0.3
0.3
0.55
0.50
V
V
V
V
V
µA
µA
µA
µA
V
µA
mA
mV
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
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.
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PI74FCT240T/241T/244T/540T/541T (25 ohm Series)
PI74FCT2240T/2241T/2244T/2541T
Octal Buffer/Line Drivers
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
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)
V
IN
= V
CC
V
IN
= GND
Min.
Typ
(2)
0.1
0.5
0.15
Max.
500
2.5
0.25
Units
µA
mA
mA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
1.5
3.5
(5)
mA
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
1.8
4.5
(5)
3.0
6.0
(5)
V
IN
= 3.4V
V
IN
= GND
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
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
∆I
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.
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PI74FCT240T/241T/244T/540T/541T (25 ohm Series)
PI74FCT2240T/2241T/2244T/2541T
Octal Buffer/Line Drivers
PI74FCT240/2240T Switching Characteristics over Operating Range
240T/2240T
Com.
Min
Max
1.5
1.5
1.5
8.0
10.0
9.5
240AT/2240AT 240CT/2240CT
Com.
Com.
Min
Max
Min
Max
1.5
1.5
1.5
4.8
6.2
5.6
1.5
1.5
1.5
4.3
5.8
5.2
240DT
Com.
Min
Max Units
1.5
1.5
1.5
3.6
4.8
4.0
ns
ns
ns
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
D
N
to O
N
Output Enable Time
OE
X
to O
N
Output Disable Time(3)
OE
X
to O
N
Conditions
(1)
C
L
= 50pF
R
L
= 500Ω
PI74FCT241/2241T Switching Characteristics over Operating Range
241T/2241T
Com.
Min
Max
1.5
1.5
1.5
6.5
8.0
7.0
241AT/2241AT 241CT/2241CT
Com.
Com.
Min
Max
Min
Max
1.5
1.5
1.5
4.8
6.2
5.6
1.5
1.5
1.5
4.1
5.8
5.2
241DT
Com.
Min
Max Units
1.5
1.5
1.5
3.6
4.8
4.0
ns
ns
ns
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
D
N
to O
N
Output Enable Time
OE
A
/OE
B
to O
N
Output Disable Time
(3)
OE
A
/OE
B
to O
N
Conditions
(1)
C
L
= 50pF
R
L
= 500Ω
PI74FCT244/2244T Switching Characteristics over Operating Range
244T/2244T
Com.
Min
Max
1.5
1.5
1.5
6.5
8.0
7.0
244AT/2244AT 244CT/2244CT
Com.
Com.
Min
Max
Min
Max
1.5
1.5
1.5
4.8
6.2
5.6
1.5
1.5
1.5
4.1
5.8
5.2
244DT
Com.
Min
Max
1.5
1.5
1.5
3.6
4.8
4.0
ns
ns
ns
Parameters Description
Units
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
D
N
to O
N
Output Enable Time
OE
X
to O
N
Output Disable Time
(3)
OE
X
to O
N
Conditions
(1)
C
L
= 50pF
R
L
= 500Ω
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
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