CMCPCI102B
CompactPCI
®
Backplane Interface
Features
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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
Product Description
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.
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.
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.
Applications
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Redundant System CompactPCI® cards
Hot-swap CompactPCI cards
Industrial PCs
Telecom/Datacom equipment
Instrumentation
Computer Telephony
Real-time machine control
Simplified Electrical Schematic
1V
For all Enable signals:
Logic 0 = switch open
Logic 1 = switch closed
*One of 10 parallel
channels is shown.
VIO
3_EN
5_EN
SW_EN
SW
PU1
SW
PU2
SW
PU3
P_EN
R
PU1
10kΩ
R
PU2
2.7kΩ
R
S
SW
S
R
PU3
1kΩ
A1-A10*
Backplane Side
10Ω
CompactPCI Device Side
B1-B10*
©
2005 California Micro Devices Corp. All rights reserved.
02/28/05
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
