PI74FCT521T
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Power Supply Characteristics
Parameters Description
ICC
Quiescent Power
Supply Current
∆ICC
Supply Current per
Input @ TTL HIGH
ICCD
Supply Current per
Input per MHz(4)
IC
Total Power Supply
Current(6)
Test Conditions(1)
VCC = Max.
VIN = GND or VCC
Min. Typ(2) Max. Units
0.1 500 µA
VCC = Max.
VIN = 3.4V(3)
0.5 2.0 mA
VCC = Max.,
Outputs Open
One Input Toggling
50% Duty Cycle
VCC = Max.,
Outputs Open
fI = 10 MHZ
50% Duty Cycle
One Bit Toggling
VIN = VCC
VIN = GND
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
0.15 0.25 mA/
MHz
1.5 3.5(5) mA
1.8 4.5(5)
Notes:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device.
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 the 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 = Input Frequency
NI = Number of Inputs at fI
All currents are in milliamps and all frequencies are in megahertz.
Switching Characteristics over Operating Range
Parameters Description
Conditions(1)
521T
Com.
Min Max
521AT
Com.
Min Max
tPLH
Propagation Delay
tPHL
AN or BN to OA=B
tPLH
Propagation Delay
tPHL
IA=B to OA=B
CL = 50 pF
RL = 500Ω
1.5 10.0 1.5 7.2
1.5 9.0 1.5 6.0
Notes:
1. See Test Circuit and Waveforms
2. Minimum limits are guaranteed but not tested on Propagation Delays.
521BT
Com.
Min Max
1.5 5.5
1.5 4.6
521CT
Com.
Min Max
521DT
Com.
Min Max Unit
1.5 4.5 1.5 4.2 ns
1.5 4.1 1.5 3.8 ns
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
4
PS2019A 03/11/96