MILITARY AND INDUSTRIAL TEMPERATURE RANGES
4
IDT54/74FCT244T/AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
Symbol Parameter Test Conditions
(1)
Min. Typ.
(2)
Max. Unit
ΔI
CC Quiescent Power Supply Current VCC = Max. — 0.5 2 mA
TTL Inputs HIGH VIN = 3.4V
(3)
ICCD Dynamic Power Supply VCC = Max. VIN = VCC — 0.15 0.25 mA/
Current
(4)
Outputs Open VIN = GND MHz
OE
A = OEB = GND
One Input Toggling
50% Duty Cycle
I
C Total Power Supply Current
(6)
VCC = Max. VIN = VCC — 1.5 3.5 mA
Outputs Open V
IN = GND
fi = 10MHz
50% Duty Cycle V
IN = 3.4V — 1.8 4.5
OEA = OEB = GND VIN = GND
One Bit Toggling
V
CC = Max. VIN = VCC —36
(5)
Outputs Open VIN = GND
fi = 2.5MHz
50% Duty Cycle V
IN = 3.4V — 5 14
(5)
OEA = OEB = GND VIN = GND
Eight Bits Toggling
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 = 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 ΔICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fCP/2+ fiNi)
ICC = Quiescent Current
ΔICC = 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 = Output Frequency
Ni = Number of Outputs at fi
All currents are in milliamps and all frequencies are in megahertz.
POWER SUPPLY CHARACTERISTICS
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
54FCT244T 54/74FCT244AT 54/74FCT244CT
Mil. Ind. Mil. Ind. Mil.
Symbol Parameter Condition
(1)
Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Unit
tPLH Propagation Delay CL = 50pF 1.5 7 1.5 4.8 1.5 5.1 1.5 4.1 1.5 4.6 ns
tPHL Dx to Ox RL = 500Ω
tPZH Output Enable Time 1.5 8.5 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.5 ns
tPZL
tPHZ Output Disable Time 1.5 7.5 1.5 5.6 1.5 5.9 1.5 5.2 1.5 5.7 ns
tPLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
