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PI5C33X257
24:12 MUX/DEMUX BusSwitch
Power Supply Characteristics
Parameters Description
I
CC
鈭咺
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
I and Y Pins Open
BE = GND
Control Input Toggling
50% Duty Cycle
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
Min.
Typ
(2)
0.1
Max.
3.0
2.5
0.25
Units
碌A(chǔ)
mA
mA/
MHz
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25擄C ambient.
3. Per TTL driven input (V
IN
= 3.4V, control inputs only); I and Y pins do not contribute to Icc.
4. This current applies to the control inputs only and represent 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 not tested, but is
guaranteed by design.
Switching Characteristics over Operating Range
PI5C33X257
Com.
Min.
Max.
0.25
0.5
0.5
0.5
5.2
4.8
5.0
Parameters Description
t
IY
t
SY
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
(2,3)
In to Yn
Bus Select Time
Sn to Yn
Bus Disable Time
E to Yn
Bus Disable Time
E to Yn
Conditions
(1)
C
L
= 50 pF
R
L
= 500鈩?/div>
Unit
ns
ns
ns
ns
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. The bus switch contributes no propagational 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 constant is much
smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. Propagational 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.
Pericom Semiconductor Corporation
2380 Bering Drive 鈥?San Jose, CA 95131 鈥?1-800-435-2336 鈥?Fax (408) 435-1100 鈥?http://www.pericom.com
190
PS8114 04/24/97
Pericom
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