PI5C16215C
20-Bit, Hot Insertion, BusSwitch with
Precharged Outputs & Undershoot Protection
ProductFeatures
ProductDescription
Undershoot protection up to 1.5V, 25ns width
PericomSemiconductorsPI5Cseriesoflogiccircuitsareproduced
using the companys advanced submicron CMOS technology.
Near zero propagation delay
5 Ohm switches connect between two ports
Fast switching speed: 4.5ns max.
Permits hot insertion
ThePI5C16215Cprovides20-bitsofhigh-speedbusswitching.The
lowon-stateresistanceoftheswitchallowsconnectionstobemade
with minimal propagation delay. The device also precharges the
B-port to a user-selectable bias voltage (BIASV) to minimize live-
insertion noise. The device incorporates an internal charge pump
to handle input undershoot of up to 1.5V and 25ns width.
Isolation during power-off conditions
B-Port outputs are precharged by bias voltage
to minimize signal distortion during live insertion.
Thedeviceisorganizedasdual 10-bitbusswitcheswithindividual
output-enable (OE) inputs. When OE is low, the corresponding
10-bit bus switch is on and port A is connected to port B. When OE
is high, the switch is open, a high-impedance state exists between
the two ports, and port B is precharged to BIASV through the
equivalent of a 10-k ohm resistor.
Package options include:
-48-pin150-milwideplasticBQSOP(B)
-48-pin240-milwideplasticTSSOP(A)
LogicBlockDiagram
To ensure the high-impedance state on power up or power down,
OE should be tied to V through a pullup resistor; the minimum
valueoftheresistorisdeterminedbythecurrent-sinkingcapability
of the driver connected to OE.
CC
1
BIASV
1B1
2
46
1A1
SW
SW
ProductPinConfiguration
BIASV
1
2
1
1
O
O
B
E
E
1
1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
12
36
1A10
1B10
1A1
2
1
A
2
3
4
5
6
3
B2
1
A
A
4
48
13
1B3
1
5
1OE
2A1
1A
6
1B4
1A
1B5
7
35
25
GND
GND
8
SW
SW
2B1
1
A
7
8
9
9
1
B6
1B7
1
A
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
1
1
2
B8
1A
24
47
48-Pin
A,B
B
9
1A10
2A10
2OE
2B10
2A1
B
10
2A
2
B1
2B2
VCC
2A
3
2B3
GND
GND
2
A
4
5
6
2
2
2
2
2
2
2
B4
2
A
B
5
2A
B6
A
B
B
7
8
2
A
A
7
8
2
B
B
9
2A
9
2A
10
B10
OE
PS8369B
12/15/01
1