IDT74FCT240ASO datasheet(5/8 Pages) IDT

5 / 8 page

IDT54/74FCT240/241/244/540/541/A/C

FAST CMOS OCTAL BUFFER/LINE DRIVER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

7.8

POWER SUPPLY CHARACTERISTICS

VLC = 0.2V; VHC = VCC – 0.2V

NOTES:

2606 tbl 06

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.

Symbol

Parameter

Test Conditions(1)

Min.

Typ.(2)

Max.

Unit

ICC

Quiescent Power Supply Current

VCC = Max.

VIN

≥ VHC; V IN ≤ VLC

—

0.2

1.5

∆ICC

Quiescent Power Supply Current

TTL Inputs HIGH

VCC = Max.

VIN = 3.4V(3)

—

0.5

2.0

ICCD

Dynamic Power Supply

Current(4)

VCC = Max.

Outputs Open

OEA = OEB = GND or

OEA = GND,

OEB = VCC

One Input Toggling

50% Duty Cycle

VIN

≥ VHC

VIN

≤ VLC

—

0.15

0.25

mA/

MHz

Total Power Supply Current (6)

VCC = Max.

Outputs Open

fi = 10MHz

50% Duty Cycle

VIN

≥ VHC

VIN

≤ VLC

(FCT)

—

1.7

4.0

OEA = OEB = GND or

OEA = GND,

OEB = VCC

One Bit Toggling

VIN = 3.4V

VIN = GND

—

2.0

5.0

VCC = Max.

Outputs Open

fi = 5MHz

50% Duty Cycle

VIN

≥ VHC

VIN

≤ VLC

(FCT)

—

3.2

6.5(5)

OEA = OEB = GND or

OEA = GND,

OEB = VCC

Eight Bits Toggling

VIN = 3.4V

VIN = GND

—

5.2

14.5(5)

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