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PI5C16215C
20-Bit, Hot Insertion, BusSwitch with
Precharged Outputs & Undershoot Protection
Product Description
Pericom Semiconductor聮s PI5C series of logic circuits are produced
using the company聮s advanced submicron CMOS technology.
Product Features
Undershoot protection up to 聳1.5V, 25ns width
Near zero propagation delay
5 Ohm switches connect between two ports
Fast switching speed: 4.5ns max.
Permits hot insertion
Isolation during power-off conditions
B-Port outputs are precharged by bias voltage
to minimize signal distortion during live insertion.
聲 Package options include:
- 48-pin 150-mil wide plastic BQSOP (B)
- 48-pin 240-mil wide plastic TSSOP (A)
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The PI5C16215C provides 20-bits of high-speed bus switching. The
low on-state resistance of the switch allows connections to be made
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 聳1.5V and 25ns width.
The device is organized as dual 10-bit bus switches with individual
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.
To ensure the high-impedance state on power up or power down,
OE should be tied to V
CC
through a pullup resistor; the minimum
value of the resistor is determined by the current-sinking capability
of the driver connected to OE.
Logic Block Diagram
1
2
46
BIASV
1B1
1A1
SW
Product Pin Configuration
1A10
12
SW
36
1B10
BIASV
1
A
1
1
A
2
1
A
3
1
A
4
1
A
5
1
A
6
1
2
3
4
5
6
7
8
9
10
11
48
47
46
45
44
43
42
41
1
O
E
2
O
E
1
B
1
1
B
2
1
B
3
1
B
4
1OE
48
1
B
5
2A1
13
SW
35
2B1
GND
1
A
7
1
A
8
GND
1
B
6
1
B
7
1
B
8
1
B
9
1
B
10
1
A
9
2A10
24
SW
25
2B10
1
A
10
2
A
1
2
A
2
2OE
47
V
CC
2
A
3
40
39
38
12
48-Pin
37
A,B
36
13
14
35
15
34
16
33
17
18
19
20
21
22
23
24
32
31
30
29
28
27
26
25
2
B
1
2
B
2
2
B
3
GND
2
A
4
2
A
5
2
A
6
GND
2
B
4
2
B
5
2
B
6
A
B
2
A
7
2
A
8
2
A
9
2
B
7
2
B
8
2
B
9
OE
2
A
10
2
B
10
1
PS8369B
12/15/01
1
2
3
4
5
