Original Creation Date: 10/24/94
Last Update Date: 02/24/99
Last Major Revision Date: 10/24/94
MNDP83950B-VQB REV 0B0
MICROCIRCUIT DATA SHEET
REPEATER INTERFACE CONTROLLER
General Description
The "RIC" may be used to implement an IEEE 802.3 multiport repeater unit including the
functions defined by the repeater, segment partition, and jabber lockup protection state
machines.
The RIC has an on-chip phase-locked-loop (PLL) for Manchester data decoding, a Manchester
encoder, and an Elasticity Buffer for preamble regeneration.
Each RIC can connect to 13 cable segments via its network interface ports. One port is
fully AUI compatible and is able to connect to an external MAU using the maximum lenght of
AUI cable. The other 12 ports have integrated 10BASE-T transceivers. These transceiver
functions may be bypassed so that the RIC may be used with external transceivers. In
addition, large repeater units, containing several hundred ports may be constructed by
cascading RICs together over an Inter-RIC bus.
The RIC is configurable for specific applications. It provides port status information for
LED array displays and a simple interface for system processors. The RIC posseses
multi-function counter and status flag arrays to facilitate network statistics gathering.
A serial interface, known as the Management Interface is available for the collection of
data in Managed Hub applications.
NS Part Numbers
DP83950BVQB-MPC
Industry Part Number
DP83950BVQB
Prime Die
DP63950
Processing
(blank)
Quality Conformance Inspection
(blank)
Subgrp Description Temp ( C)
o
1
Static tests at
+25
2
Static tests at
+85
3
Static tests at
-40
4
Dynamic tests at
+25
5
Dynamic tests at
+85
6
Dynamic tests at
-40
7
Functional tests at
+25
8A
Functional tests at
+85
8B
Functional tests at
-40
9
Switching tests at
+25
10
Switching tests at
+85
11
Switching tests at
-40
1
MICROCIRCUIT DATA SHEET
MNDP83950B-VQB REV 0B0
Features
- Compliant with the IEEE 802.3 Repeater Specification
- 13 network connections (ports) per chip
- Selectable on-chip twisted-pair transceivers
- Cascadable for large hub applications
- Compatible with AUI compliant transceivers
- On-chip Elasticity Buffer, Manchester encoder and decoder
- Separate partition state machines for each port
- Provides port status information for LED displays including: receive, collision,
partition and link status
- Power-up configuration options:
Repeater and Partition Specifications, Transceiver interface, Status Display, Processor
Operations
- Simple processor interface for repeater management and port disable
- On-chip Event Counters and Event Flag Arrays
- Serial Management Interface to combine packet and repeater status information together
- CMOS process for low power dissipation
- Single 5V supply
2
MICROCIRCUIT DATA SHEET
MNDP83950B-VQB REV 0B0
(Absolute Maximum Ratings)
Supply Voltage(Vcc)
-0.3V to 7.0V
DC Input Voltage(Vin)
-0.3V to Vcc +0.3V
DC Output Voltage(Vout)
-0.3V to Vcc +0.3V
Storage Temperature(Tstg)
-40 C to +150 C
Power Dissipation(Pd)
2W
Lead Temperature(Tl)
260 C
(Soldering, 10 seconds)
Recommended Operating Conditions
Vcc
4.75V min 5.25V max
Supply Voltage
3
MNDP83950B-VQB REV 0B0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
DC: PROCESSOR,LED,TWISTED PAIR,INTER-RIC & MGMT. INTERFACES
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC:
Vcc = 5V +5%
SYMBOL
PARAMETER
CONDITIONS
NOTES
PIN-
NAME
MIN
MAX
UNIT
SUB-
GROUPS
Voh
Minimum High
Level Output
Voltage
Ioh = -8mA
3.5
V
1, 2,
3
Vol
Minimum Low Level
Output Voltage
Iol = 8mA
0.4
V
1, 2,
3
Vih
Minimum High
Level Input
Voltage
2.0
V
1, 2,
3
Vil
Maximum Low Level
Input Voltage
0.8
V
1, 2,
3
Iin
Input Current
Vin = Vcc OR GND
-1.0
1.0
uA
1, 2,
3
Ioz
Maximum TRI-STATE
Output Leakage
Current
Vout = Vcc or GND
-10
10
uA
1, 2,
3
Icc
Average Supply
Current
Vin = Vcc or GND, Vcc = 5.25V
380
mA
1, 2,
3
DC PARAMETERS: AUI
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC:
Vcc = 5V +5%
Vod
Differential
Output
Voltage(TX+)
78 Ohms Termination and 270 Ohms
Pulldowns
PORT 1
+550
+1200
mV
1, 2,
3
Vds
Differential
Squelch Threshold
(RX+, CD+)
3, 5 PORT 1
-175
-300
mV
1, 2,
3
DC PARAMETERS: PSEUDO AUI
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC:
Vcc = 5V +5%
Vpod
Differential
Output Voltage
(TX+)
270 Ohms Termination and 1K Ohm
Pulldowns
3, 5 PORTS
2-13
+450
+1200
mV
1, 2,
3
Vpds
Differential
Squelch Threshold
(RX+, CD+)
3, 5 PORTS
2-13
-175
-300
mV
1, 2,
3
4
MNDP83950B-VQB REV 0B0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
DC PARAMETERS: TWISTED PAIR
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC:
Vcc = 5V +5%
SYMBOL
PARAMETER
CONDITIONS
NOTES
PIN-
NAME
MIN
MAX
UNIT
SUB-
GROUPS
Vron
Minimum Squelch
Threshold
Normal Mode
PORTS
2-13
+300
+585
mV
1, 2,
3
Reduced Mode
PORTS
2-13
+340
mV
1, 2,
3
AC PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC:
Vcc = 5V +5%, Cl = 50pF, Vil(TTL) = 0V, Vih(TTL) = 3V
T1
ACKI low to
ACKO Low
2, 3
24
nS
9, 10,
11
T2
ACKI High to
ACKO High
2, 3
21
nS
9, 10,
11
T3a
RX Active to
ACKO Low
3, 4 AUI &
PSEUDO
AUI
66
nS
9, 10,
11
T4a
RX Inactive to
ACKO High
3, 4 AUI &
PSEUDO
AUI
325
nS
9, 10,
11
T5a
RX Active to
ACTNd Active
3, 4 AUI &
PSEUDO
AUI
105
nS
9, 10,
11
T6a
RX Inactive to
ACTNd Inactive
3, 4 AUI &
PSEUDO
AUI
325
nS
9, 10,
11
T3t
RX Active to
ACKO Low
4
TWISTED
PAIR
ONLY
240
nS
9, 10,
11
T4t
RX Inactive to
ACKO High
4
TWISTED
PAIR
ONLY
255
nS
9, 10,
11
T5t
RX Active to
ACTNd Active
4
TWISTED
PAIR
ONLY
270
nS
9, 10,
11
T6t
RX Inactive to
ACTNd Inactive
4
TWISTED
PAIR
ONLY
265
nS
9, 10,
11
T15a
ACTNd Active to
TX Active
3,
4, 5
AUI &
PSEUDO
AUI
585
nS
9, 10,
11
T15t
ACTNd Active to
TX Active
4, 5 TWISTED
PAIR
ONLY
790
nS
9, 10,
11
5
PDF 
ZIP