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IDT54FCT621TP Datasheet PDF : 6 Pages
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IDT54/74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
∆ICC
ICCD
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current(4)
VCC = Max.
VIN = 3.4V(3)
Vcc = Max.
Outputs Open
GBA = GAB = GND or VCC
One Input Toggling
50% Duty Cycle
VIN = VCC
VIN = GND
IC
Total Power Supply Current(6,7)
Vcc = Max.
VIN = VCC
Outputs Open
VIN = GND
GBA = GAB = GND or VCC
One Bit Toggling
VIN = 3.4V
at fi =10MHz
VIN = GND
50% Duty Cycle
Vcc = Max.
Outputs Open
GBA = GAB = GND or VCC
Eight Bits Toggling
at fi = 2.5MHz
50% Duty Cycle
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
Min.
—
Typ.(2)
0.5
Max.
2.0
Unit
mA
—
0.15 0.25 mA/MHz
—
1.5
3.5
mA
—
1.8
4.5
—
3.0
6.0(5)
—
5.0
14.0(5)
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. 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 Output 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.
7. This test is performed with outputs tied to GND through a pull-down resistor.
2538 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
IDT54/74FCT621T
IDT54/74FCT621AT
Symbol
Parameter
Condition(1)
Com’l.
Mil.
Com’l.
Mil.
Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH
Propagation Delay A to B
CL = 50pF
tPHL
RL = 500Ω
tPLH
Propagation Delay B to A
tPHL
tPLH
G Propagation Delay BA to A
tPHL
tPLH
Propagation Delay GAB to B
tPHL
5.5 13.0 5.5 13.5 5.5
1.5 8.5 1.5 9.5 1.5
5.5 12.5 5.5 13.0 5.5
1.5 8.0 1.5 9.0 1.5
5.5 14.0 5.5 14.5 5.5
1.5 8.5 1.5 9.5 1.5
5.5 14.0 5.5 14.5 5.5
1.5 8.0 1.5 9.0 1.5
12.0 5.5
6.8 1.5
12.0 5.5
6.4 1.5
13.0 5.5
6.8 1.5
13.0 5.5
6.4 1.5
12.5 ns
7.6
12.5 ns
7.2
13.5 ns
7.6
13.5 ns
7.2
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
2538 tbl 07
6.18
4
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