MT8931B Datasheet, PDF (1/3 Pages) Mitel Networks Corporation – Subscriber Network Interface Circuit

CMOS ST-BUS™ FAMILY MT8931B
®
Subscriber Network Interface Circuit
Preliminary Information
Features
ISSUE 2
August 1993
• CCITT I.430 and ANSI T1.605 S/T interface
• Full-duplex 2B+D, 192 kbit/s transmission
• Link activation/deactivation
• D-channel access contention resolution
Ordering Information
MT8931BC 28 Pin Ceramic DIP
MT8931BE 28 Pin Plastic DIP
MT8931BP 44 Pin PLCC
-40°C to +85°C
• Point-to-point, point-to-multipoint and star
configurations
Description
• Master (NT)/Slave (TE) modes of operation
ed ^{t • Exceeds loop length requirements}
nd n ^{hee • Complete loopback testing capabilities}
me ^{ig ta s • On chip HDLC D-channel protocoller}
m ^{es C da • 8 bit Motorola/Intel microprocessor interface}
co ^{D 31 1B • Microprocessor-controlled operation}
Re ^{ew 89 93 • Mitel ST-BUS interface}
t ^{N T T8 • Low power CMOS technology}
No for ^{e M} _full ^{M • Single 5 volt power supply}
Se_{y for Applications}
factor • ISDN NT1
ult • ISDN S or T interface
ns _{• ISDN Terminal Adaptor (TA)}
Co _{• Digital sets (TE1) - 4 wire ISDN interface}
The MT8931B Subscriber Network Interface Circuit
(SNIC) implements the CCITT I.430 and ANSI
T1.605 Recommendations for the ISDN S and T
reference points. Providing point-to-point and point-
to-multipoint digital transmission, the SNIC may be
used at either end of the subscriber line (NT or TE).
An HDLC D-channel protocoller is included and
controlled through a Motorola/Intel microprocessor
port.
The MT8931B is fabricated in Mitel’s CMOS process.
• Digital PABXs, Digital Line Cards (NT2)
DSTi
DSTo
F0od
C4b
F0b
STAR/Rsto
XTAL1/NT
XTAL2/NC
ST-BUS
Interface
Timing
and
Control
D-channel Priority
Mechanism
PLL
HDLC
Transceiver
S-Bus
Link
Interface
Link
Activation
Controller
LTx
VBias
LRx
VDD
Microprocessor Interface
VSS
Rsti HALF
AD0-7
R/W/WR
DS/RD
AS/ALE
CS
IRQ/NDA
Figure 1 - Functional Block Diagram
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