IDT74FCT244A datasheet(4/6 Pages) IDT

Part #	IDT74FCT244A

Description	FAST CMOS OCTAL BUFFER/LINE DRIVER

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Manufacturer	IDT [Integrated Device Technology]

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MILITARYANDCOMMERCIALTEMPERATURERANGES

IDT54/74FCT244/A/C

FASTCMOSOCTALBUFFER/LINEDRIVER

POWER SUPPLY CHARACTERISTICS

VLC = 0.2V; VHC = VCC - 0.2V

Symbol

Parameter

Test Conditions(1)

Min.

Typ.(2)

Max.

Unit

ICC

Quiescent Power Supply Current

VCC = Max.

VIN

≥ VHC; VIN ≤ VLC

—0.2

1.5

mA

∆ICC

Quiescent Power Supply Current

TTL Inputs HIGH

VCC = Max.

VIN = 3.4V(3)

—0.5

2

mA

ICCD

Dynamic Power Supply Current(4)

VCC = Max.

Outputs Open

OEA = OEB = GND

One Input Toggling

50% Duty Cycle

VIN

≥ VHC

VIN

≤ VLC

—

0.15

0.25

mA/

MHz

IC

Total Power Supply Current (6)

VCC = Max.

Outputs Open

fi = 10MHz

50% Duty Cycle

VIN

≥ VHC

VIN

≤ VLC

(FCT)

—1.7

4

mA

OEA = OEB = GND

One Bit Toggling

VIN = 3.4V

VIN = GND

—2

5

VCC = Max.

Outputs Open

fi = 2.5MHz

50% Duty Cycle

VIN

≥ VHC

VIN

≤ VLC

(FCT)

—3.2

6.5(5)

OEA = OEB = GND

Eight Bits Toggling

VIN = 3.4V

VIN = GND

—

5.2

14.5(5)

NOTES:

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at VCC = 5.0V, +25°C ambient.

3. Per TTL driven input (VIN = 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. IC = IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC +

∆ICC DHNT + ICCD (fCP/2 + fiNi)

ICC = Quiescent Current

∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)

DH = Duty Cycle for TTL Inputs High

NT = Number of TTL Inputs at DH

ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)

fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)

fi = Input Frequency

Ni = Number of Inputs at fi

All currents are in milliamps and all frequencies are in megahertz.

SWITCHING CHARACTERISTICS OVER OPERATING RANGE (1,2)

54/74FCT244

54/74FCT244A

54/74FCT244C

Com'l.

Mil.

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Condition

Min.

Max. Min.

Max.

Unit

tPLH

tPHL

Propagation Delay

DN to ON

CL = 50pF

RL = 500

Ω

1.5

6.5

1.5

7

1.5

4.8

1.5

5.1

1.5

4.1

1.5

4.6

ns

tPZH

tPZL

Output Enable Time

1.5

8

1.5

8.5

1.5

6.2

1.5

6.5

1.5

5.8

1.5

6.5

ns

tPHZ

tPLZ

Output Disable Time

1.5

7

1.5

7.5

1.5

5.6

1.5

5.9

1.5

5.2

1.5

5.7

ns

NOTES:

1. See test circuit and wave forms.

2. Minimum limits are guaranteed but not tested on Propagation Delays.

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