4

Feb.11.20

INDUSTRIALTEMPERATURERANGE

74FCT3244/A

3.3VCMOSOCTALBUFFER/LINEDRIVER

NOTES:

1. For conditions shown as Min. or Max., 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

ΔICC formula. These limits are guaranteed but not tested.

6. IC = IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC +

ΔICC DHNT + ICCD (fCPNCP/2 + fiNi)

ICC = Quiescent Current (ICC, ICCH, and ICCZ)

ΔICC = 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

POWER SUPPLY CHARACTERISTICS

Symbol

Parameter

Test Conditions(1)

Min.

Typ.(2)

Max.

Unit

ICC

Quiescent Power Supply Current

VCC = Max.

VIN = VCC - 0.6V

—

2

30

μA

ICCD

Dynamic Power Supply

VCC = Max.

VIN = VCC

—60

85

μA/

Current(4)

Outputs Open

VIN = GND

MHz

xOE = GND

One Input Toggling

50% Duty Cycle

IC

Total Power Supply Current(6)

VCC = Max.

VIN = VCC

—

0.6

0.9

mA

Outputs Open

VIN = GND

fI = 10MHz

50% Duty Cycle

VIN = VCC - 0.6V

—

0.6

0.9

xOE = GND

VIN = GND

One Bit Toggling

VCC = Max.

VIN = VCC

—

1.2

1.7(5)

Outputs Open

VIN = GND

fI = 2.5MHz

50% Duty Cycle

VIN = VCC - 0.6V

—

1.2

1.8(5)

xOE = GND

VIN = GND

Eight Bits Toggling

NOTES:

1. 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%.

2. See test circuit and waveforms.

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

74FCT3244

74FCT3244A

Symbol

Parameter

Condition(2)

Min.(3)

Max.

Min.(3)

Max.

Unit

tPLH

PropagationDelay

CL = 50pF

1.5

6.5

1.5

4.8

ns

tPHL

xAx to xYx

RL = 500

Ω

tPZH

OutputEnableTime

1.5

8

1.5

6.2

ns

tPZL

tPHZ

OutputDisableTime

1.5

7

1.5

5.6

ns

tPLZ

SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1)