IDT74FCT645CTSO datasheet(4/8 Pages) IDT

Part #	IDT74FCT645CTSO

Description	FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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4 / 8 page

6.9

4

IDT54/74FCT245T/AT/CT/DT - 2245T/AT/CT, IDT54/74FCT640T/AT/CT, IDT54/74FCT645T/AT/CT/DT

FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

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.

2539 tbl 08

Symbol

Parameter

Test Conditions(1)

Min.

Typ.(2)

Max.

Unit

∆ICC

Quiescent Power Supply Current

TTL Inputs HIGH

VCC = Max.

VIN = 3.4V(3)

—

0.5

2.0

mA

ICCD

Dynamic Power Supply

Current(4)

VCC = Max.

Outputs Open

VIN = VCC

VIN = GND

FCTxxxT

—

0.15

0.25

mA/

MHz

OE = T/R = GND

One Input Toggling

50% Duty Cycle

FCT2xxxT

—

0.06

0.12

IC

Total Power Supply Current(6)

VCC = Max.

VIN = VCC

FCTxxxT

—

1.5

3.5

mA

Outputs Open

fi = 10MHz

VIN = GND FCT2xxxT

—

0.6

2.2

50% Duty Cycle

VIN = 3.4

FCTxxxT

—

1.8

4.5

OE = T/R = GND

One Bit Toggling

VIN = GND FCT2xxxT

0.9

3.2

VCC = Max.

VIN = VCC

FCTxxxT

—

3.0

6.0(5)

Outputs Open

fi = 2.5MHz

VIN = GND FCT2xxxT

—

1.2

3.4(5)

50% Duty Cycle

VIN = 3.4

FCTxxxT

—

5.0

14.0(5)

OE = T/R = GND

Eight Bits Toggling

VIN = GND FCT2xxxT

—

3.2

11.4(5)

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