PI5C16215C Datasheet, PDF (1/5 Pages) Pericom Semiconductor Corporation – 20-Bit,Hot Insertion,BusSwitch with Precharged Outputs & Undershoot Protection

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20-Bit, Hot Insertion, BusSwitch with
Precharged Outputs & Undershoot Protection
Product Features
• Undershoot protection up to –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.
• Package options include:
- 48-pin 150-mil wide plastic BQSOP (B)
- 48-pin 240-mil wide plastic TSSOP (A)
Logic Block Diagram
1A1 ²
SW
1 _BIASV
46 _1B1
1A10 ¹²
SW
48
1OE
2A1 ¹³
SW
36 _1B10
35 _2B1
2A10 ²⁴
SW
2OE ⁴⁷
25 _2B10
A
B
OE
Product Description
Pericom Semiconductor’s PI5C series of logic circuits are produced
using the company’s advanced submicron CMOS technology.
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 –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.
Product Pin Configuration
BIASV
1A1
1A2
1A3
1A4
1A 5
1A 6
GND
1A7
1A8
1A 9
1A10
2A1
2A 2
V_CC
2A 3
GND
2A 4
2A 5
2A 6
2A 7
2A 8
2A 9
2A 10
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12 ^48-Pin 37
13 ^A,B 36
14
35
15
34
16
33
17
32
18
31
19
30
20
29
21
28
22
27
23
26
24
25
1OE
2OE
1B1
1B2
1B3
1B4
1B5
GND
1B6
1B7
1B 8
1 B9
1 B10
2B1
2B2
2B3
GND
2B4
2B5
2B6
2B7
2B8
2B9
2B10
1
PS8369B
12/15/01