IDT54/74FCT521/A/B/C FAST CMOS
8-BIT IDENTITY COMPARATOR
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS VLC = 0.2V; VHC = VCC – 0.2V
Symbol
Parameter
Test Conditions(1)
Min. Typ.(2) Max. Unit
ICC
Quiescent Power Supply Current VCC = Max.
VIN ≥ VHC; VIN ≤ VLC
— 0.2 1.5 mA
∆ICC
ICCD
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current(4)
VCC = Max.
VIN = 3.4V(3)
VCC = Max.
Outputs Open
One Input Toggling
VIN ≥ VHC
VIN ≤ VLC
— 0.5 2.0 mA
— 0.15 0.25 mA/
MHz
50% Duty Cycle
IC
Total Power Supply Current(5)
VCC = Max.
VIN ≥ VHC
Outputs Open
VIN ≤ VLC (FCT)
— 1.7 4.0 mA
fi = 10MHz
One Bit Toggling
50% Duty Cycle
VIN = 3.4V
VIN = GND
— 2.0 5.0
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 = 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. 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 = Input Frequency
Ni = Number of Inputs at fi
All currents are in milliamps and all frequencies are in megahertz.
2604 tbl* 04
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
IDT54/74FCT521
IDT54/74FCT521A
IDT54/74FCT521B
IDT54/74FCT521C
Com'l.
Mil.
Com'l.
Mil.
Com'l.
Mil.
Com'l.
Mil.
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH Propagation CL = 50pF
1.5 11.0 1.5 15.0 1.5 7.2 1.5 9.5 1.5 5.5 1.5 7.3 1.5 4.5 1.5 5.1 ns
tPHL Delay
RL = 500Ω
An or Bn to
OA = B
tPLH Propagation
tPHL Delay
IA = B to
1.5 10.0 1.5 9.0 1.5 6.0 1.5 7.8 1.5 4.6 1.5 6.0 1.5 4.1 1.5 4.5 ns
OA = B
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
2604 tbl* 07
7.16
4