74FST6800PGG Просмотр технического описания (PDF) - Integrated Device Technology
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74FST6800PGG Datasheet PDF : 5 Pages
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IDT74FST6800
10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
ΔICC
Quiescent Power Supply Current
VCC = Max.
TTL Inputs HIGH
VIN = 3.4V(3)
ICCD
Dynamic Power Supply
Current(4)
VCC = Max., Outputs Open
Enable Pin Toggling
50% Duty Cycle
IC
Total Power Supply Current(6)
VCC = Max., Outputs Open
Enable Pin Toggling
(Ten Switches Toggling)
fi = 10MHz
50% Duty Cycle
VIN = VCC
VIN = GND
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
Min. Typ.(2) Max.
Unit
—
0.5
1.5
mA
—
30
40
μA/
MHz/
Enable
—
3
4
mA
—
3.3
4.8
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 Icc formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fiN)
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 Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (zero for non-register devices)
fi = Input Frequency
N = Number of SwitchesToggling at fi
All currents are in milliamps and all frequencies are in megahertz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5%
Symbol Description
Condition(1)
Min.(2)
Typ.
tPLH
Data Propagation Delay
tPHL
Ax, Bx to Bx, Ax(3,4)
tPZH
Switch Turn On Delay
tPZL
ON to Ax, Bx
tPHZ
Switch Turn Off Delay
tPLZ
ON to Ax, Bx(3)
CL = 50pF
—
—
RL = 500Ω
1.5
—
1.5
—
Max.
Unit
0.25
ns
6.5
ns
5.5
ns
NOTES:
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 0.25 ns for 50 pF 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 of 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.
3
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