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IDT54157ATD

FAST CMOS OCTAL BUFFER/LINE DRIVERS

Integrated Device Technology 

IDT54/74FCT240/244T/AT/CT/DT - 2240/2244T/AT/CT, IDT54/74FCT540/541/2541T/AT/CT

FAST CMOS OCTAL BUFFER/LINE DRIVER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

Symbol

∆ICC

ICCD

IC

Parameter

Quiescent Power Supply Current

TTL Inputs HIGH

Dynamic Power Supply

Current(4)

Total Power Supply Current(6)

Test Conditions(1)

VCC = Max.

VIN = 3.4V(3)

VCC = Max.

VIN = VCC

Outputs Open

OEA = OEB = GND

VIN = GND

One Input Toggling

50% Duty Cycle

VCC = Max.

VIN = VCC

FCTxxxT

FCT2xxxT

FCTxxxT

Min. Typ.(2) Max.

— 0.5 2.0

— 0.15 0.25

— 0.06 0.12

— 1.5 3.5

Unit

mA

mA/

MHz

mA

Outputs Open

VIN = GND FCT2xxxT — 0.6 2.2

fi = 10MHz

50% Duty Cycle

OEA = OEB = GND

VIN = 3.4 FCTxxxT — 1.8 4.5

One Bit Toggling

VIN = GND FCT2xxxT

0.9 3.2

VCC = Max.

VIN = VCC FCTxxxT

—

3.0 6.0(5)

Outputs Open

VIN = GND FCT2xxxT —

1.2 3.4(5)

fi = 2.5MHz

50% Duty Cycle

OEA = OEB = GND

Eight Bits Toggling

VIN = 3.4 FCTxxxT —

VIN = GND FCT2xxxT —

5.0 14.0(5)

3.2 11.4(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.

2565 tbl 08

6.8

5

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