Function, pinout, and drive compatible with FCT and
F logic
•
FCT-D speed at 3.6 ns max. (Com’l),
FCT-C speed at 4.1 ns max. (Com’l)
•
Reduced V
OH
(typically = 3.3V) versions of equivalent
FCT functions
•
Edge-rate control circuitry for significantly improved
noise characteristics
•
Power-off disable feature
•
ESD > 2000V
•
Matched rise and fall times
•
Fully compatible with TTL input and output logic levels
•
Extended commercial range of
−40°C
to +85°C
• Sink current
64 mA (Com’l), 48 mA (Mil)
Source current
32 mA (Com’l), 12 mA (Mil)
Functional Description
The FCT240T and FCT244T are octal buffers and line drivers
designed to be employed as memory address drivers, clock
drivers, and bus-oriented transmitters/receivers. The devices
provide speed and drive capabilities equivalent to their fastest
bipolar logic counterparts while reducing power consumption. The
input and output voltage levels allow direct interface with TTL,
NMOS, and CMOS devices without external components.
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
Logic Block Diagram
FCT240T
OE
A
OE
B
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
FCT240T–1
DA
0
OB
0
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
OE
A
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
FCT240T–4
FCT244T
Pin Configurations
LCC
Top View
DA3
OB 2
DA2
OB 1
DA1
DIP/SOIC/QSOP
Top View
OE
A
DA
0
OB
0
3
2
1
20
19
OB
0
DA
0
OE
A
V
CC
OE
B
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
FCT240T–2
1
2
3
4
20
19
18
17
V
CC
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
FCT240T–3
OB
3
GND
DB
3
OA
3
DB
2
9
10
11
12
13
LCC
Top View
DA3
OB 2
DA2
OB 1
DA1
DIP/SOIC/QSOP
Top View
OE
A
DA
0
OB
0
3
2
1
20
19
OB
0
DA
0
OE
A
V
CC
OE
B
DA
1
OB
1
DA
2
OB
2
DA
3
OB
3
GND
1
2
3
4
20
19
18
17
V
CC
OE
B
OA
0
DB
0
OA
1
DB
1
OA
2
DB
2
OA
3
DB
3
8
OB
3
GND
DB
3
OA
3
DB
2
9
10
11
12
13
7 6 5 4
FCT240T
8
7 6 5 4
5 FCT240T 16
6
7
8
9
10
15
14
13
12
11
5 FCT244T 16
6
7
8
9
10
15
14
13
12
11
FCT244T
14 1516 17 18
OA2
DB 1
OA1
DB 0
OA0
14 1516 17 18
OA2
DB1
OA1
DB0
OA0
FCT240T–5
FCT240T–6
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
• CA 95134 •
408-943-2600
May 1994 – Revised March 18, 1997
CY54/74FCT240T
CY54/74FCT244T
]
Function Table FCT240T
[1]
Inputs
OE
A
L
L
H
OE
B
L
L
H
D
L
H
X
Output
H
L
Z
]
Function Table FCT244T
[1]
Inputs
OE
A
L
L
H
OE
B
L
L
H
D
L
H
X
Output
L
H
Z
Maximum Ratings
[2, 3]
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature ................................. –65°C to +150°C
Ambient Temperature with
Power Applied............................................. –65°C to +135°C
Supply Voltage to Ground Potential ............... –0.5V to +7.0V
DC Input Voltage............................................ –0.5V to +7.0V
DC Output Voltage ......................................... –0.5V to +7.0V
DC Output Current (Maximum Sink Current/Pin)....... 120 mA
Power Dissipation.......................................................... 0.5W
Static Discharge Voltage ........................................... >2001V
(per MIL-STD-883, Method 3015)
Operating Range
Range
Commercial
Commercial
Military
[4]
Speed
DT
T, AT, CT
All
Ambient
Temperature
0°C to +70°C
–40°C to +85°C
–55°C to +125°C
V
CC
5V
±
5%
5V
±
5%
5V
±
10%
Electrical Characteristics
Over the Operating Range
Parameter
V
OH
Description
Output HIGH Voltage
Test Conditions
V
CC
=Min., I
OH
=–32 mA
V
CC
=Min., I
OH
=–15 mA
V
CC
=Min., I
OH
=–12 mA
V
OL
V
IH
V
IL
V
H
V
IK
I
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
I
OFF
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Hysteresis
[6]
Input Clamp Diode Voltage
Input HIGH Current
Input HIGH Current
Input LOW Current
Off State HIGH-Level Output
Current
Off State LOW-Level
Output Current
Output Short Circuit Current
[7]
Power-Off Disable
All inputs
V
CC
=Min., I
IN
=–18 mA
V
CC
=Max., V
IN
=V
CC
V
CC
=Max., V
IN
=2.7V
V
CC
=Max., V
IN
=0.5V
V
CC
= Max., V
OUT
= 2.7V
V
CC
= Max., V
OUT
= 0.5V
V
CC
=Max., V
OUT
=0.0V
V
CC
=0V, V
OUT
=4.5V
–60
–120
0.2
–0.7
–1.2
5
±1
±1
10
–10
–225
±1
V
CC
=Min., I
OL
=64 mA
V
CC
=Min., I
OL
=48mA
Com’l
Com’l
Mil
Com’l
Mil
2.0
0.8
Min.
2.0
2.4
2.4
3.3
3.3
0.3
0.3
0.55
0.55
Typ.
[5]
Max.
Unit
V
V
V
V
V
V
V
V
V
µA
µA
µA
µA
µA
mA
µA
Notes:
1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care.
2. Unless otherwise noted, these limits are over the operating free-air temperature range.
3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V
CC
or ground.
4. T
A
is the “instant on” case temperature.
5. Typical values are at V
CC
=5.0V, T
A
=+25°C ambient.
6. This parameter is guaranteed but not tested.
7. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, I
OS
tests should be performed last.
]
2
CY54/74FCT240T
CY54/74FCT244T
Capacitance
[6]
Parameter
C
IN
C
OUT
Input Capacitance
Output Capacitance
Description
Typ.
[5]
5
9
Max.
10
12
Unit
pF
pF
Power Supply Characteristics
Parameter
I
CC
∆I
CC
I
CCD
Description
Test Conditions
Typ.
[5]
0.1
0.5
0.06
Max.
0.2
2.0
0.12
Unit
mA
mA
mA/MHz
Quiescent Power Supply Current V
CC
=Max., V
IN
≤0.2V,
V
IN
≥V
CC
–0.2V
Quiescent Power Supply Current V
CC
=Max., V
IN
=3.4V,
[8]
(TTL inputs)
f
1
=0, Outputs Open
Dynamic Power Supply
Current
[9]
Total Power Supply Current
[10]
V
CC
=Max., One Input Toggling,
50% Duty Cycle, Outputs Open, OE
1
=OE
2
=GND,
V
IN
≤0.2V
or V
IN
≥V
CC
–0.2V
V
CC
=Max., 50% Duty Cycle, Outputs Open,
One Bit Toggling at f
1
=10 MHz,
OE
1
=OE
2
=GND, V
IN
≤0.2V
or V
IN
≥V
CC
–0.2V
V
CC
=Max., 50% Duty Cycle, Outputs Open,
One Bit Toggling at f
1
=10 MHz,
OE
1
=OE
2
=GND, V
IN
=3.4V or V
IN
=GND
V
CC
=Max., 50% Duty Cycle, Outputs Open,
Eight Bits Toggling at f
1
=2.5 MHz,
OE
1
=OE
2
=GND, V
IN
≤0.2V
or V
IN
≥V
CC
–0.2V
V
CC
=Max., 50% Duty Cycle, Outputs Open,
Eight Bits Toggling at f
1
=2.5 MHz,
OE
1
=OE
2
=GND, V
IN
=3.4V or V
IN
=GND
Notes:
8. Per TTL driven input (V
IN
=3.4V); all other inputs at V
CC
or GND.
9. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
10. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+∆I
CC
D
H
N
T
+I
CCD
(f
0
/2 + f
1
N
1
)
I
CC
= Quiescent Current with CMOS input levels
∆I
CC
= Power Supply Current for a TTL HIGH input (V
IN
=3.4V)
= Duty Cycle for TTL inputs HIGH
D
H
N
T
= Number of TTL inputs at D
H
I
CCD
= Dynamic Current caused by an input transition pair (HLH or LHL)
f
0
= Clock frequency for registered devices, otherwise zero
= Input signal frequency
f
1
N
1
= Number of inputs changing at f
1
All currents are in milliamps and all frequencies are in megahertz.
11. Values for these conditions are examples of the I
CC
formula. These limits are guaranteed but not tested.
I
C
0.7
1.4
mA
1.0
2.4
mA
1.3
2.6
[11]
mA
3.3
10.6
[11]
mA
3
CY54/74FCT240T
CY54/74FCT244T
Switching Characteristics
Over the Operating Range
FCT240T
Military
Parameter
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
Data to Input
Output Enable Time
Output Disable Time
Min.
[12]
1.5
1.5
1.5
Max.
9.0
10.5
10.0
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
8.0
10.0
9.5
Min.
[12]
1.5
1.5
1.5
FCT240AT
Military
Max.
5.1
6.5
5.9
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
4.8
6.2
5.6
Unit
ns
ns
ns
Fig.
No.
[13]
1, 2
1, 7, 8
1, 7, 8
FCT240CT
Military
Parameter
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay Data to Input
Output Enable Time
Output Disable Time
Min.
[12]
1.5
1.5
1.5
Max.
4.7
5.7
4.6
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
4.3
5.0
4.5
FCT240DT
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
3.6
4.8
4.0
Unit
ns
ns
ns
Fig.
No.
[13]
1, 2
1, 7, 8
1, 7, 8
FCT244T
Military
Parameter
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
Data to Input
Output Enable Time
Output Disable Time
Min.
[12]
1.5
1.5
1.5
Max.
7.0
8.5
7.5
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
6.5
8.0
7.0
Min.
[12]
1.5
1.5
1.5
FCT244AT
Military
Max.
5.1
6.5
5.9
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
4.6
6.2
5.6
Unit
ns
ns
ns
Fig.
No.
[13]
1, 3
1, 7, 8
1, 7, 8
FCT244CT
Military
Parameter
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay Data to Input
Output Enable Time
Output Disable Time
Min.
[12]
1.5
1.5
1.5
Max.
4.6
6.5
5.7
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
4.1
5.8
5.2
FCT244DT
Commercial
Min.
[12]
1.5
1.5
1.5
Max.
3.6
4.8
4.0
Unit
ns
ns
ns
Fig.
No.
[13]
1, 3
1, 7, 8
1, 7, 8
Shaded areas contain preliminary information.
Notes:
12. Minimum limits are guaranteed but not tested on Propagation Delays.
13. See “Parameter Measurement Information” in the General Information section.
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