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PS2011B 12/11/00
Logic Block Diagrams
PI74FCT240/2240T
PI74FCT241/2241T
PI74FCT244/2244T
PI74FCT540T
PI74FCT541/2541T
*Logic diagram shown for 540T.
541/2541T is the non-inverting option.
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.
Product Features
PI74FCT240/241/244/540/541T and PI74FCT2240/2241/2244/
2541T are pin compatible with bipolar FASTTM Series at a
higher speed and lower power consumption
25
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:
40C to +85C
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
OE
A
DA
0
OB
0
OB
1
DA
1
OB
2
DA
2
OB
3
DA
3
OA
0
DB
0
OE
B
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
OE
A
DA
0
OB
0
OB
1
DA
1
OB
2
DA
2
OB
3
DA
3
OA
0
DB
0
OE
B
*
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
241 Only
*
OE
B
for 241T,
*
OE
B
for 244T,
OE
A
D
0
O
0
OE
B
D
1
O
1
D
2
O
2
D
3
O
3
D
4
O
4
D
5
O
5
D
6
O
6
D
7
O
7
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Fast CMOS Octal
Buffer/Line Drivers
PI74FCT240T/241T/
244T/540T/541T (25 ohmSeries)
PI74FCT2240T/2241T/2244T/2541T
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PI74FCT240T/241T/244T/540T/541T (25 ohm Series)
PI74FCT2240T/2241T/2244T/2541T
Octal Buffer/Line Drivers
Product Pin Description
Pin Name
Description
OEA, OEB
3-State Output Enable Inputs (Active LOW)
OEB
(1)
3-State Output Enable Input (Active HIGH)
Dxx
Inputs
Oxx
Outputs
GND
Ground
V
CC
Power
Inputs
(1)
Outputs
(1)
OE
A
OE
B
OE
B
(2)
D
240 241 244 540 541
L
L
H
L
H
L
L
H
L
L
L
H
H
L
H
H
L
H
H
H
L
X
Z
Z
Z
Z
Z
Truth Table
PI74FCT540/541/2541T Product Pin Configuration
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 Product Pin Configuration
PI74FCT240/2240T Product Pin Configuration
*OE
B
for 241T, OE
B
for 244T
*Ox for 540T, Ox for 541T
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
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
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
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
20-Pin
H20
L20
P20
Q20
R20
S20
20-Pin
H20
L20
P20
Q20
R20
S20
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
A
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
Vcc
OE
B
O
0
*
O
2
*
O
2
*
O
3
*
O
4
*
O5*
O
6
*
O
7
*
20-Pin
H20
L20
P20
Q20
R20
S20
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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.)
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 = 40C to +85C, VCC = 5.0V 5%)
Parameters Description
Test Conditions
(1)
Min. Typ
(2)
Max. Unit
s
V
OH
Output HIGH Voltage
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OH
= 15.0mA
2.4
3.0
V
V
OL
Output LOW Current
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 64mA
0.3
0.55
V
V
OL
Output LOW Current
V
CC
= Min., V
IN
= V
IH
or V
IL
I
OL
= 12mA (25
Series)
0.3
0.50
V
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.8
V
I
IH
Input HIGH Current
V
CC
= Max.
V
IN
= V
CC
1
A
I
IL
Input LOW Current
V
CC
= Max.
V
IN
= GND
1
A
I
OZH
High Impedance
V
CC
= M
AX
.
V
OUT
= 2.7V
1
A
I
OZL
Output Current
V
OUT
= 0.5V
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.7
1.2
V
I
OFF
Power Down Disable
V
CC
= GND, V
OUT
= 4.5V
--
--
100
A
I
OS
Short Circuit Current
V
CC
= Max.
(3)
, V
OUT
= GND
60
120
mA
V
H
Input Hysteresis
200
mV
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
6
10
pF
C
OUT
Output Capacitance
V
OUT
= 0V
8
12
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, +
25C 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.
Storage Temperature ........................................................... 65
C to +150C
Ambient Temperature with Power Applied ........................... -40
C to +85C
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
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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
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
0.1
500
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
0.5
2.5
mA
Input @ TTL HIGH
I
CCD
Supply Current per
V
CC
= Max.,
V
IN
= V
CC
0.15
0.25
mA/
Input per MHz
(4)
Outputs Open
V
IN
= GND
MHz
OE
A
= OE
B
= GND or
OE
A
= GND, OE
B
= V
CC
One Bit Toggling
50% Duty Cycle
I
C
Total Power Supply
V
CC
= Max.,
V
IN
= V
CC
1.5
3.5
(5)
mA
Current
(6)
Outputs Open
V
IN
= GND
f
I
= 10 MH
Z
50% Duty Cycle
OE
A
= OE
B
= GND or
V
IN
= 3.4V
1.8
4.5
(5)
OE
A
= GND, OE
B
= V
CC
V
IN
= GND
One Bit Toggling
V
CC
= Max.,
V
IN
= V
CC
3.0
6.0
(5)
Outputs Open
V
IN
= GND
f
I
= 2.5 MH
Z
50% Duty Cycle
OE
A
= OE
B
= GND or
V
IN
= 3.4V
5.0
14.0
(5)
OE
A
= GND, OE
B
= V
CC
V
IN
= GND
Eight Bits Toggling
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, +25C 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
240AT/2240AT 240CT/2240CT
240DT
Com.
Com.
Com.
Com.
Parameters Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max Units
t
PLH
Propagation Delay
C
L
= 50pF
1.5
8.0
1.5
4.8
1.5
4.3
1.5
3.6
ns
t
PHL
D
N
to O
N
R
L
= 500
t
PZH
Output Enable Time
1.5
10.0
1.5
6.2
1.5
5.8
1.5
4.8
ns
t
PZL
OE
X
to O
N
t
PHZ
Output Disable Time(3)
1.5
9.5
1.5
5.6
1.5
5.2
1.5
4.0
ns
t
PLZ
OE
X
to O
N
PI74FCT241/2241T Switching Characteristics over Operating Range
241T/2241T
241AT/2241AT 241CT/2241CT
241DT
Com.
Com.
Com.
Com.
Parameters Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max Units
t
PLH
Propagation Delay
C
L
= 50pF
1.5
6.5
1.5
4.8
1.5
4.1
1.5
3.6
ns
t
PHL
D
N
to O
N
R
L
= 500
t
PZH
Output Enable Time
1.5
8.0
1.5
6.2
1.5
5.8
1.5
4.8
ns
t
PZL
OE
A
/OE
B
to O
N
t
PHZ
Output Disable Time
(3)
1.5
7.0
1.5
5.6
1.5
5.2
1.5
4.0
ns
t
PLZ
OE
A
/OE
B
to O
N
PI74FCT244/2244T Switching Characteristics over Operating Range
244T/2244T
244AT/2244AT 244CT/2244CT
244DT
Com.
Com.
Com.
Com.
Parameters Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max
Units
t
PLH
Propagation Delay
C
L
= 50pF
1.5
6.5
1.5
4.8
1.5
4.1
1.5
3.6
ns
t
PHL
D
N
to O
N
R
L
= 500
t
PZH
Output Enable Time
1.5
8.0
1.5
6.2
1.5
5.8
1.5
4.8
ns
t
PZL
OE
X
to O
N
t
PHZ
Output Disable Time
(3)
1.5
7.0
1.5
5.6
1.5
5.2
1.5
4.0
ns
t
PLZ
OE
X
to O
N
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.
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PI74FCT240T/241T/244T/540T/541T (25 ohm Series)
PI74FCT2240T/2241T/2244T/2541T
Octal Buffer/Line Drivers
PI74FCT540T Switching Characteristics over Operating Range
540T
540AT
540CT
540DT
Com.
Com.
Com.
Com.
Parameters Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min
Max Units
t
PLH
Propagation Delay
C
L
= 50pF
1.5
5.5
1.5
4.8
1.5
4.3
1.5
3.8
ns
t
PHL
D
N
to O
N
R
L
= 500
t
PZH
Output Enable Time
1.5
10.0
1.5
6.2
1.5
5.8
1.5
5.2
ns
t
PZL
OE
X
to O
N
t
PHZ
Output Disable Time
(3)
1.5
6.0
1.5
5.6
1.5
5.2
1.5
5.2
ns
t
PLZ
OE
X
to O
N
PI74FCT541/2541T Switching Characteristics over Operating Range
541T/2541T
541AT/2541AT 541CT/2541CT
541DT
Com.
Com.
Com.
Com.
Parameters Description
Conditions
(1)
Min
Max
Min
Max
Min
Max
Min Max Units
t
PLH
Propagation Delay
C
L
= 50pF
1.5
6.0
1.5
4.8
1.5
4.1
1.5
3.8
ns
t
PHL
D
N
to O
N
R
L
= 500
t
PZH
Output Enable Time
1.5
9.5
1.5
6.2
1.5
5.8
1.5
5.2
ns
t
PZL
OE
X
to O
N
t
PHZ
Output Disable Time
(3)
1.5
6.5
1.5
5.6
1.5
5.2
1.5
5.2
ns
t
PLZ
OE
X
to O
N
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.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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