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PI90LVB044 Datasheet Preview

PI90LVB044 Datasheet

LVDS Dual 2x2 Crosspoint/Repeater Switch

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PI90LV044, PI90LVB044
LVDS Dual 2x2 Crosspoint/Repeater Switch
Features
Dual 2x2 Crosspoint/Repeater Switch
Meets or Exceeds the Requirements of
ANSI TIA/EIA-644-1995
Designed for Signaling Rates up to 650 Mbit/s (325Mhz)
Operates from a single 3.3V Supply: –40°C to 85°C
Low-Voltage Differential Signaling with Output Voltages of
±350mV into:
- 100Ω load (PI90LV044)
- 50Ω load Bus LVDS Signaling (PI90LVB044)
Accepts ±350mV differential inputs
Wide common mode input range: 0.2V to 2.7V
Output drivers are high impedance when disabled or
when VCC 1.5V
Inputs are open, short, and terminated fail safe
Propagation Delay Time: 3.5ns
ESD protection is 10kV on bus pins
Bus Pins are High Impedance when disabled or
with VCC less than 1.5V
TTL Inputs are 5V Tolerant
Power Dissipation at 400 Mbit/s of 250mW
Packaging (Pb-free & Green available):
- 28-pin QSOP (Q)
- 28-pin TSSOP (L)
Block Diagram
S0,S1
1A/1B
1DE/2DE
1Y/1Z
2A/2B
3A/3B
2Y/2Z
3Y/3Z
4A/4B
S2/S3
4Y/4Z
3DE/4DE
Description
The PI90LV044 and PI90LVB044 are monolithic dual 2x2 asyn-
chronous crosspoint/repeater switches. The crosspoint function
is based on a multiplexer tree architecture. Each 2x2 switch can
be considered as a pair of 2:1 multiplexers that share the same
inputs. The signal path through each switch is fully differential
with minimal propagation delay. The signal path is unregistered,
so no clock is required for the data inputs. The signal line drivers
and receivers use Low Voltage Differential Signaling (LVDS) to
achieve signaling rates as high as 650Mbps.
The LVDS standard provides a minimum differential output volt-
age magnitude of 247 mV into a 100Ω load and receipt of 100
mV signals with up to 1V of ground potential difference between a
transmitter and receiver. The PI90LVB044 doubles the output drive
current to achieve LVDS levels with a 50 ohm load.
The intended application of these devices is for loop-through and
redundant channel switching for both point-to-point baseband
(PI90LV044) and multipoint (PI90LVB044) data transmissions
over controlled impedance media.
Pin Configuration
1B
1A
S0
1DE
S1
2A
2B
3A
3B
S2
3DE
S3
4A
4B
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 VCC
27 1Y
26 1Z
25 2DE
24 2Z
23 2Y
22 GND
21 VCC
20 3Y
19 3Z
18 4DE
17 4Y
16 4Z
15 GND
1
PS8485D
09/22/04




Pericom Semiconductor

PI90LVB044 Datasheet Preview

PI90LVB044 Datasheet

LVDS Dual 2x2 Crosspoint/Repeater Switch

No Preview Available !

PI90LV044, PI90LVB044
LVDS Dual 2x2 Crosspoint/Repeater Switch
MUX Truth Table
Input
S3, S1
0
0
1
1
S2, S0
0
1
0
1
Output
1Y/1Z - 3Y/3Z
2T/2Z - 4Y/4Z
1A/1B - 3A/3B
1A/1B - 3A/3B
2A/2B - 4A/4B
2A/2B - 4A/4B
1A/1B - 3A/3B
1A/1B - 3A/3B
2A/2B - 4A/4B
2A/2B - 4A/4B
Note:
1. Setting nDE to 0 will set Ouput nY/nZ to High Impedance.
Function
Splitter
Splitter
Router
Router
S1/S0
1A/1B
2A/2B
S3/S2
3A/3B
4A/4B
Router Options
1DE/2DE
1Y/1Z
2Y/2Z
Cross Point
Router
3DE/4DE
3Y/3Z
4Y/4Z
Pass Through
Router
S1/S0
1A/1B
2A/2B
1DE/2DE
1Y/1Z
2Y/2Z
Splitter A
S3/S2
3A/3B
3DE/4DE
3Y/3Z
4A/4B
4Y/4Z
Splitter Options
Figure 1. Possible Signal Routing
2
Splitter B
PS8485D
09/22/04


Part Number PI90LVB044
Description LVDS Dual 2x2 Crosspoint/Repeater Switch
Maker Pericom Semiconductor
Total Page 12 Pages
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