INDUSTRIAL TEMPERATURE RANGE
4
IDT74FCT3244/A
3.3V CMOS OCTAL BUFFER/LINE DRIVER
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
I
CCD Dynamic Power Supply VCC = Max. VIN = VCC —6085μA/
Current
(4)
Outputs Open VIN = GND MHz
xOE = GND
One Input Toggling
50% Duty Cycle
I
C Total Power Supply Current
(6)
VCC = Max. VIN = VCC — 0.6 0.9 mA
Outputs Open VIN = GND
fI = 10MHz
50% Duty Cycle V
IN = VCC - 0.6V — 0.6 0.9
xOE = GND VIN = GND
One Bit Toggling
V
CC = Max. VIN = VCC — 1.2 1.7
(5)
Outputs Open VIN = GND
fI = 2.5MHz
50% Duty Cycle V
IN = 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 Propagation Delay CL = 50pF 1.5 6.5 1.5 4.8 ns
tPHL xAx to xYx RL = 500Ω
tPZH Output Enable Time 1.5 8 1.5 6.2 ns
tPZL
tPHZ Output Disable Time 1.5 7 1.5 5.6 ns
tPLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(1)
