MILITARY AND INDUSTRIAL TEMPERATURE RANGES
4
IDT54/74FCT240T/AT/CT
FAST CMOS OCTAL BUFFER/LINE DRIVER
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
∆ICC 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 M Hz
OEA = OEB = GND
One Input Toggling
50% Duty Cycle
ICTotal Power Supply Current(6) VCC = Max. VIN = VCC — 1.5 3.5 mA
Outputs Open VIN = GND
fi = 10MHz
50% Duty Cycle VIN = 3.4V — 1.8 4.5
OEA = OEB = GND VIN = GND
One Bit Toggling
VCC = Max. VIN = VCC —36
(5)
Outputs Open VIN = GND
fi = 2.5MHz
50% Duty Cycle VIN = 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 ∆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 = 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.
FCT240T FCT240AT FCT240CT
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 9 1.5 4.8 1.5 5.1 1.5 4.3 1.5 4.7 ns
tPHL Dx to OxRL = 500Ω
tPZH Output Enable Time 1.5 10.5 1.5 6.2 1.5 6.5 1.5 5.8 1.5 6.5 ns
tPZL
tPHZ Output Disable Time 1.5 10 1.5 5.6 1.5 5.9 1.5 5.2 1.5 5.7 ns
tPLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE