Texas Instruments CY74FCT244CTSOC, CY74FCT244CTQCT, CY74FCT244CTQC, CY74FCT244ATSOCT, CY74FCT244ATSOC Datasheet

8-Bit Buffers/Line Drivers

CY54/74FCT240T

CY54/74FCT244T

SCCS017 - May 1994 - Revised February 2000

Copyright © 2000, Texas Instruments Incorporated

Features

• Function, pinout, and drive compatible with FCT and

F logic

• FCT-D speed at 3.6 ns max. (Com’l FCT244 only),

FCT-C speed at 4.1 ns max. (Com’l),
FCT-A speed at 4.8 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 v oltage le v els allow direct interface with TTL,
NMOS, and CMOS devices without e xternal components.

The outputs are designed with a power-off disable feature to
allow for live insertion of boards.

Logic Block Diagram

FCT240T–2

4

8
9
10
11
12

765

1516 17 18

3
2
1

20

13

14

19

DA

3

OB2OB

1

DB

0

OA

2

OA

0

DB

3

V

CC

GND

DB

1

Top View

DA

1

LCC

OE

A

FCT240T–1

DA

0

OB

0

OB

3

DB

2

OA

3

1
2
3
4
5
6
7
8
9
10

11

12

16

17

18

19

20

13

14

OE

A

DA

0

OB

0

DA

1

OB

1

DA

2

DA

3

GND

V

CC

FCT240T–3

15

DIP/SOIC/QSOP

Top View

OA

1

DA

2

OE

B

OB

2

OB

3

OE

B

OA

0

OA

2

DB

2

DB

3

OA

3

DB

0

OA

1

DB

1

OE

B

OE

A

DA

0

OB

0

DA

1

OB

1

DA

2

DA

3

OB

2

OB

3

OA

0

OA

2

DB

2

DB

3

OA

3

DB

0

OA

1

DB

1

Pin Configurations

4

8
9
10
11
12

765

1516 17 18

3
2
1

20

13

14

19

DA

3

OB2OB

1

DB

0

OA

2

OA

0

DB

3

V

CC

GND

DB

1

Top View

DA

1

LCC

OE

A

DA

0

OB

0

OB

3

DB

2

OA

3

1
2
3
4
5
6
7
8
9
10

11

12

16

17

18

19

20

13

14

OE

A

DA

0

OB

0

DA

1

OB

1

DA

2

DA

3

GND

V

CC

15

DIP/SOIC/QSOP

Top View

OA

1

DA

2

OE

B

OB

2

OB

3

OE

B

OA

0

OA

2

DB

2

DB

3

OA

3

DB

0

OA

1

DB

1

OE

B

OE

A

DA

0

OB

0

DA

1

OB

1

DA

2

DA

3

OB

2

OB

3

OA

0

OA

2

DB

2

DB

3

OA

3

DB

0

OA

1

DB

1

FCT240T–4

FCT240T–5 FCT240T–6

FCT240T

FCT240T

FCT244T

FCT244T

FCT240T

FCT244T

CY54/74FCT240T

CY54/74FCT244T

2

] ]

Maximum Ratings

[2, 3]

(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.............................................–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)

Function Table FCT240T

[1]

Inputs

OutputOE

A

OE

B

D

L
L

H

L
L

H

L
H
X

H

L

Z

Function Table FCT244T

[1]

Inputs

OutputOE

A

OE

B

D

L
L

H

L
L

H

L
H
X

L
H
Z

Operating Range

Range Speed

Ambient

Temperature V

CC

Commercial DT 0°C to +70°C 5V ± 5%
Commercial T, AT, CT –40°C to +85°C 5V ± 5%
Military

[4]

All –55°C to +125°C 5V ± 10%

Electrical Characteristics Over the Operating Range

Parameter Description Test Conditions Min. Typ.

[5]

Max. Unit

V

OH

Output HIGH Voltage VCC=Min., IOH=–32 mA Com’l 2.0 V

VCC=Min., IOH=–15 mA Com’l 2.4 3.3 V
VCC=Min., IOH=–12 mA Mil 2.4 3.3 V

V

OL

Output LOW Voltage VCC=Min., IOL=64 mA Com’l 0.3 0.55 V

VCC=Min., IOL=48mA Mil 0.3 0.55 V

V

IH

Input HIGH Voltage 2.0 V

V

IL

Input LOW Voltage 0.8 V

V

H

Hysteresis

[6]

All inputs 0.2 V

V

IK

Input Clamp Diode Voltage VCC=Min., IIN=–18 mA –0.7 –1.2 V

I

I

Input HIGH Current VCC=Max., VIN=V

CC

5 µA

I

IH

Input HIGH Current VCC=Max., VIN=2.7V ±1 µA

I

IL

Input LOW Current VCC=Max., VIN=0.5V ±1 µA

I

OZH

Off State HIGH-Level Output
Current

VCC= Max., V

OUT

= 2.7V 10 µA

I

OZL

Off State LOW-Level
Output Current

VCC = Max., V

OUT

= 0.5V –10 µA

I

OS

Output Short Circuit Current

[7]

VCC=Max., V

OUT

=0.0V –60 –120 –225 mA

I

OFF

Power-Off Disable VCC=0V, V

OUT

=4.5V ±1 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, TA=+25˚C ambient.

6. This parameter is specified 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.

CY54/74FCT240T

CY54/74FCT244T

3

]

Capacitance

[6]

Parameter Description Typ.

[5]

Max. Unit

C

IN

Input Capacitance 5 10 pF

C

OUT

Output Capacitance 9 12 pF

Power Supply Characteristics

Parameter Description Test Conditions Typ.

[5]

Max. Unit

I

CC

Quiescent Power Supply Current VCC=Max., VIN≤0.2V,

V

IN≥VCC

–0.2V

0.1 0.2 mA

∆I

CC

Quiescent Power Supply Current
(TTL inputs)

VCC=Max., VIN=3.4V,

[8]

f1=0, Outputs Open

0.5 2.0 mA

I

CCD

Dynamic Power Supply
Current

[9]

VCC=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,

OE1=OE2=GND,

V

IN

≤0.2V or VIN≥VCC–0.2V

0.06 0.12 mA/MHz

I

C

Total Power Supply Current

[10]

VCC=Max., 50% Duty Cycle, Outputs Open,
One Bit Toggling at f

1

=10 MHz,

OE1=OE2=GND, VIN≤0.2V or VIN≥VCC–0.2V

0.7 1.4 mA

VCC=Max., 50% Duty Cycle, Outputs Open,
One Bit Toggling at f

1

=10 MHz,

OE1=OE2=GND, VIN=3.4V or VIN=GND

1.0 2.4 mA

VCC=Max., 50% Duty Cycle, Outputs Open,
Eight Bits Toggling at f

1

=2.5 MHz,

OE1=OE2=GND, VIN≤0.2V or VIN≥VCC–0.2V

1.3 2.6

[11]

mA

VCC=Max., 50% Duty Cycle, Outputs Open,
Eight Bits Toggling at f

1

=2.5 MHz,

OE1=OE2=GND, VIN=3.4V or VIN=GND

3.3 10.6

[11]

mA

Notes:

8. Per TTL driven input (V

IN

=3.4V); all other inputs at VCC 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

IC=ICC+∆ICCDHNT+I

CCD(f0

/2 + f1N1)

I

CC

= Quiescent Current with CMOS input levels

∆I

CC

= Power Supply Current for a TTL HIGH input (VIN=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

0

= Clock frequency for registered devices, otherwise zero

f

1

= Input signal frequency

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 ICC formula. These limits are specified but not tested.