IDT74FCT244QB datasheet(4/6 Pages) IDT

Part #	IDT74FCT244QB

Description	3.3V CMOS OCTAL BUFFER/LINE DRIVER

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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4 / 6 page

IDT54/74FCT3244/A

3.3V CMOS OCTAL BUFFER/LINE DRIVER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

8.11

4

NOTES:

1. See test circuit and waveforms.

2. Minimum limits are guaranteed but not tested on Propagation Delays.

3. Propagation Delays and Enable/Disable times are with VCC = 3.3V

±0.3V, Normal Range. For VCC = 2.7V to 3.6V, Extended Range, all Propagation Delays

and Enable/Disable times should be degraded by 20%.

POWER SUPPLY CHARACTERISTICS

FCT3244

FCT3244A

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Condition(1)

Min.(2)

Max.

Min.(2)

Max.

Min.(2)

Max.

Min.(2)

Max.

Unit

tPLH

tPHL

Propagation Delay

xAx to xYx

CL = 50pF

RL = 500

Ω

1.5

6.5

1.5

7.0

1.5

4.8

1.5

5.1

ns

tPZH

tPZL

Output Enable Time

1.5

8.0

1.5

8.5

1.5

6.2

1.5

6.5

ns

tPHZ

tPLZ

Output Disable Time

1.5

7.0

1.5

7.5

1.5

5.6

1.5

5.9

ns

2779 tbl 07

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

(3)

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 = 3.3V, +25

°C ambient.

3. Per TTL driven input; 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 (fCPNCP/2 + fiNi)

ICC = Quiescent Current (ICCL, ICCH and ICCZ)

∆ICC = Power Supply Current for a TTL High Input

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)

NCP = Number of Clock Inputs at fCP

fi = Input Frequency

Ni = Number of Inputs at fi

2779 tbl 06

Symbol

Parameter

Test Conditions(1)

Min.

Typ.(2)

Max.

Unit

∆ICC

Quiescent Power Supply Current

VCC = Max.

VIN = VCC – 0.6V(3)

—

2.0

30

µA

ICCD

Dynamic Power Supply

Current(4)

VCC = Max.

Outputs Open

50% Duty Cycle

x

OE = GND

One Input Toggling

VIN = VCC

VIN = GND

—60

85

µA/

MHz

IC

Total Power Supply Current(6)

VCC = Max.

VIN = VCC

—

0.6

0.9

mA

Outputs Open

VIN = GND

fi = 10MHz

50% Duty Cycle

x

OE = GND

VIN = VCC –0.6V

VIN = GND

—

0.6

0.9

One Bit Toggling

VCC = Max.

Outputs Open

fi = 2.5MHz

VIN = VCC

VIN = GND

—

1.2

1.7(5)

50% Duty Cycle

x

OE = GND

Eight Bits Toggling

VIN = VCC –0.6V

VIN = GND

—

1.2

1.8(5)

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