
4
1999 Integrated Device Technology, Inc
IDT
QS3257
DSC-XXXXXX
POWER SUPPLY CHARACTERISTICS OVER OPERATING RANGE
T
A = –40°C to +85°C, VCC = 5.0V ± 5%
Symbol
Parameter
Test Conditions(1)
Max
Unit
ICCQ
Quiescent Power
VCC = Max., VIN = GND or VCC, f = 0
3.0
A
Supply Current
I
CC
Power Supply Current(2)
V
CC = Max, VIN = 3.4V, f = 0
1.5
mA
per Input HIGH
per control input
Q
CCD
Dynamic Power Supply
V
CC = Max, I and Y Pins Open,
0.25
mA/
Current per MHz(3)
Control Inputs Toggling @ 50% Duty Cycle
MHz
QS3257
QS32257
Symbol
Description(1)
Min
Typ
Max
Min
Typ
Max
Unit
t
PLH
Data Propagation Delays(2,3)
—
0.25(3)
—
1.25(3)
ns
t
PHL
In to Y
tPZH
Switch Turn-on Delay
0.5
—
5.2
0.5
—
6.2
ns
t
PZL
Sn to Y
t
PZH
Switch Turn-on Delay
0.5
—
4.8
0.5
—
5.8
ns
t
PZL
En to Y
t
PHZ
Switch Turn-off Delay(2)
0.5
—
5.0
0.5
—
5.0
ns
t
PLZ
En to Y, Sn to Y
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A = –40°C to +85°C, VCC = 5.0V ± 5%
C
LOAD = 50pF, RLOAD = 500 unless otherwise noted.
Notes:
1. See Test Circuit and Waveforms. Minimums guaranteed, but not production tested.
2. This parameter is guaranteed, but not production tested.
3. 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 0.25ns for QS3257 and 1.25ns for QS32257 for C
L = 50pF. Since this time constant is 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.
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Notes:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC specifications.
2. Per TTL driven-input (V
IN = 3.4V, control inputs only). I and Y pins do not contribute to ICC.
3. This parameter applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The I and Y inputs
generate no significant AC or DC currents as they transition. This parameter is guaranteed, but not production tested.