IDT74FCT621T(2006) Ver la hoja de datos (PDF) - Integrated Device Technology
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IDT74FCT621T Datasheet PDF : 6 Pages
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IDT74FCT621T/AT
FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
ΔICC
Quiescent Power Supply Current
TTL Inputs HIGH
ICCD
Dynamic Power Supply Current(4)
IC
Total Power Supply Current(6,7)
VCC = Max.
VIN = 3.4V(3)
Vcc = Max.
Outputs Open
GBA = GAB = GND or VCC
One Input Toggling
50% Duty Cycle
Vcc = Max.
Outputs Open
GBA = GAB = GND or VCC
One Bit Toggling
at fi =10MHz
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 = VCC
VIN = GND
VIN = 3.4V
VIN = GND
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
Min.
Typ.(2)
—
0.5
—
0.15
Max.
Unit
2
mA
0.25 mA/MHz
—
1.5
3.5
mA
—
1.8
4.5
—
3
6(5)
—
5
14(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 + 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 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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, A to B
Propagation Delay, B to A
Propagation Delay, GBA to A
Propagation Delay, GAB to B
Condition(1)
CL = 50pF
RL = 500Ω
IDT74FCT621T
Min.(2)
Max.
5.5
13
1.5
8.5
5.5
12.5
1.5
8
5.5
14
1.5
8.5
5.5
14
1.5
8
IDT74FCT621AT
Min.(2)
Max.
Unit
5.5
12
ns
1.5
6.8
5.5
12
ns
1.5
6.4
5.5
13
ns
1.5
6.8
5.5
13
ns
1.5
6.4
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
4
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