IDT74FCT245ASOB datasheet(4/7 Pages) IDT

4 / 7 page

7.9

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

Quiescent Power Supply Current

Vcc = Max.

—

0.5

1.5

VIN

≥ VHC; VIN ≤ VLC

∆ICC

Quiescent Power Supply Current

Vcc = Max.

—

0.5

2.0

TTL Inputs HIGH

VIN = 3.4V

(3)

ICCD

Dynamic Power Supply Current

(4)

Vcc = Max.

VIN

≥ VHC

—

0.15

0.25

mA/MHz

Outputs Open

VIN

≤ VLC

OE = GND

R = GND or VCC

One Input Toggling

50% Duty Cycle

Total Power Supply Current

(6)

Vcc = Max.

VIN

≥ VHC

—

2.0

4.0

Outputs Open

VIN

≤ VLC

fi = 10MHz

(FCT)

50% Duty Cycle

VIN = 3.4V

—

2.3

5.0

R = OE = GND

VIN = GND

One Bit Toggling

Vcc = Max.

VIN

≥ VHC

—

3.5

6.5

(5)

Outputs Open

VIN

≤ VLC

fi = 2.5MHz

(FCT)

50% Duty Cycle

VIN = 3.4V

—

5.5

14.5

(5)

R = OE = GND

VIN = GND

Eight Bits Toggling

NOTES:

2534 tbl 04

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.

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