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PDF CMCPCI102B Data sheet ( Hoja de datos )
| Número de pieza | CMCPCI102B | |
| Descripción | CompactPCI Backplane Interface | |
| Fabricantes | California Micro Devices | |
| Logotipo |  |
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CMCPCI102B
CompactPCI® Backplane Interface
Features
Product Description
• CompactPCI® standards compliant
• Allows CompactPCI System Cards to be
used in any Slot
• Provides termination for up to ten channels
• Provides a series switch in each channel
• Supports hot-swap capability
• Very low capacitance load on each line
• Industrial temperature range
• 28-pin TSSOP package
• Lead-free version available
The CMCPCI102BT/BR is a 10-channel backplane
interface/termination IC specifically designed for Com-
pactPCI redundant system-slot cards. The
CMCPCI102BT/BR allows CompactPCI boards to
interface to the backplane and provides the versatility
to use system cards in any slot (system or peripheral).
Per the CompactPCI specification, the CMCPCI102BT/
BR provides a 10Ω termination resistor for each chan-
nel to terminate the transmission line stub on the
board. An integral series switch and associated control
signal (SW_EN) permits connection/disconnection of
the channel, so that the device side of the circuit may
be isolated from the backplane side.
Applications
• Redundant System CompactPCI® cards
• Hot-swap CompactPCI cards
• Industrial PCs
• Telecom/Datacom equipment
• Instrumentation
• Computer Telephony
• Real-time machine control
The CompactPCI standard requires system boards to
be hot-swappable. To accommodate this requirement,
the CMCPCI102BT/BR features a switched 10kΩ resis-
tor connected to the 1V Precharge Supply Voltage. If
the precharge enable pin (P_EN) is asserted, then the
10kΩ pull-up resistors are connected to precharge the
circuits.
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In addition, a system board requirement mandates
either a 1.0kΩ pull-up resistor or a 2.7kΩ resistor con-
nected to VIO. CompactPCI slot cards must work in
either 3.3V or 5V systems, hence the need for both
2.7kΩ and 1kΩ resistors. If the 3_EN pin is logic high,
the 2.7kΩ resistor is used as the pull-up. If the 5_EN pin
is logic high, the 1kΩ resistor is used.
The CMCPCI102BT/BR integrates all these functions in
a low-profile 28-pin TSSOP package and is available
with optional lead-free finishing.
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Simplified Electrical Schematic
For all Enable signals:
Logic 0 = switch open
Logic 1 = switch closed
*One of 10 parallel
channels is shown.
SW_EN
P_EN
A1-A10*
Backplane Side
1V
SWPU1
RPU1
10kΩ
RS
10Ω
VIO
3_EN
5_EN
SWPU2
SWPU3
RPU2
2.7kΩ
RPU3
1kΩ
SWS B1-B10*
CompactPCI Device Side
DataSheet4U© 2.c00o5mCalifornia Micro Devices Corp. All rights reserved.
02/28/05 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com
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CMCPCI102B
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Performance Information
Resistance Variation with Input Voltage
The series resistance RS varies with input voltage and
supply voltage, as shown in Figure 1.
Variation of 10R Resistor with I/O Voltage, T=25'C
15
14
Vcc5.5
13
Vcc3.0
12
11
10
9
8
7
6
5
0123456
I/O Voltage [ V ]
Figure 1. Resistance Variation vs. Input Voltage
CAP Pin Capacitance
Some external capacitance is necessary to prevent the
voltage on the CAP pin from falling during sustained
data transfers through the device. This ensures that
the logic 1 level does not degrade.
The time required to open and close the series switch,
SWs, varies according to how much capacitance is
present on the CAP pin.
The minimum usable value is 200pF, placed close to
the pins. A 0.01uF, 16V capacitor is recommended.
See Figure 3 and Figure 4 for variation of switch on/off
times vs. capacitance.
Switch ON Time vs. CAP Capacitor Value
16
14
12
10
Resistance Variation with Temperature
8
The series resistance
as shown in Figure 2.
RS
also
varies
with
temperature,
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4
Temperature Variation of 10R Resistor
2
15
14
13 VCC5VIN0
VCC5VIN5
12 VCC3VIN0
11 VCC3VIN3
10
9
8
7
6
5
-40
-20
0 20 40 60
Temperature [ oC ]
80 100
CONDITIONS:
Curve VCC3VIN0:
Curve VCC3VIN3:
Curve VCC5VIN0:
Curve VCC5VIN5:
VIO = 3.0V
VIO = 3.0V
VIO = 5.5V
VIO = 5.5V
channel voltage = 0.0V
channel voltage = 3.0V
channel voltage = 0.0V
channel voltage = 5.5V
Figure 2. Resistance Variation vs. Temperature
0
0
2000
4000
6000
8000
10000
12000
Capacitor Value on CAP Pin [pF]
Figure 3. Switch ON Time vs. CAP Capacitor Value
14
12
10
8
6
4
2
0
0
Switch OFF Time vs. CAP Capacitor Value
2000
4000
6000
8000
Capacitor Value on CAP Pin [pF]
10000
12000
Figure 4. Switch OFF Time vs. CAP Capacitor Value
DataShee
DataSheet4U© 2.c00o5mCalifornia Micro Devices Corp. All rights reserved.
02/28/05 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com
5
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| PDF Descargar | [ Datasheet CMCPCI102B.PDF ] | |
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