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IDT74FST1632384 Datasheet PDF : 6 Pages
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IDT74FST163384, IDT74FST1632384
20-BIT BUS SWITCH
COMMERCIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
Min. Typ.(2) Max.
∆ICC
Quiescent Power Supply Current VCC = Max.
TTL Inputs HIGH
VIN = 3.4V(3)
— 0.5 1.5
ICCD
Dynamic Power Supply
Current(4)
VCC = Max.
Outputs Open
VIN = VCC
VIN = GND
—
30
40
Enable Pin Toggling
50% Duty Cycle
IC
Total Power Supply Current(6)
VCC = Max.
VIN = VCC
— 6.0 8.0
Outputs Open
VIN = GND
Enable Pins Toggling
(20 Switches Toggling) VIN = 3.4
— 7.0 11.0
fi = 10MHz
VIN = GND
NOTES:
50% Duty Cycle
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 (fiN)
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)
fi = Input Frequency
N = Number of Switches Toggling at fi
All currents are in milliamps and all frequencies are in megahertz.
Unit
mA
µA/
MHz/
Switch
mA
3473 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: TA =–40°C to +85°C, VCC = 5.0V ±10%
163384
1632384
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
|QCI|
Description
Data Propagation Delay
Ai to Bi, Bi to Ai(3,4)
Switch Turn on Delay
BEx to Ai, Bi
Switch Turn off Delay
BEx to Ai, Bi(3)
Charge Injection(5,6)
Condition(1)
CL = 50pF
RL = 500Ω
Min.(2)
—
1.5
1.5
—
Typ.
—
—
—
1.5
Max.
Unit
0.25
1.25
ns
6.5
7.5
ns
5.5
5.5
ns
—
—
pC
NOTES:
3473 tbl 07
1. See test circuit and waveforms.
2. Minimum limits guaranteed but not tested.
3. This parameter is guaranteed by design but not tested.
4. The bus switch contributes no propagation delay other than the RC delay of the on resistance of the switch and the load capacitance. The time constant
for the switch alone is of the order of 2.5ns for 50pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals,
it adds very little propagation delay to the system. Propagation delay on the bus switch when used in a system is determined by the driving circuit on the
driving side of the switch and its interaction with the load on the driven side.
5. Measured at switch turn off, load = 50 pF in parallel with 10MΩ scope probe, VIN = 0.0 volts.
6. Characterized parameter. Not 100% tested.
4
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