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IDT54FCT245

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

Integrated Device Technology 

IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

VLC = 0.2V; VHC = VCC – 0.2V

Symbol

Parameter

Test Conditions(1)

Min. Typ.(2) Max.

Unit

ICC

∆ICC

ICCD

IC

Quiescent Power Supply Current

Quiescent Power Supply Current

TTL Inputs HIGH

Dynamic Power Supply Current(4)

Total Power Supply Current(6)

Vcc = Max.

VIN ≥ VHC; VIN ≤ VLC

Vcc = Max.

VIN = 3.4V(3)

Vcc = Max.

Outputs Open

OE = GND

T/R = GND or VCC

One Input Toggling

50% Duty Cycle

Vcc = Max.

Outputs Open

fi = 10MHz

50% Duty Cycle

T/R = OE = GND

One Bit Toggling

Vcc = Max.

Outputs Open

fi = 2.5MHz

50% Duty Cycle

T/R = OE = GND

Eight Bits Toggling

VIN ≥ VHC

VIN ≤ VLC

—

0.5

1.5

mA

—

0.5

2.0

mA

—

0.15 0.25 mA/MHz

VIN ≥ VHC

—

VIN ≤ VLC

(FCT)

VIN = 3.4V

—

VIN = GND

VIN ≥ VHC

—

VIN ≤ VLC

(FCT)

VIN = 3.4V

—

VIN = GND

2.0

4.0

mA

2.3

5.0

3.5

6.5(5)

5.5

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 Output 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.

2534 tbl 04

7.9

4

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