General Information
Contents
1
1.1
1.2
2
2.1
2.2
2.3
2.4
2.5
3
3.1
3.2
3.3
4
5
6
7
Page
Features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
System Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Functional Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Functions and Device Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Individual Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clocking, Reset and Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control of Layer 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
15
16
20
27
36
38
38
38
41
Electrical Characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Package Outlines
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Information on Literature.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Semiconductor Group - Addresses
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
IOM
®
, IOM
®
-1, IOM
®
-2, ISAC
®
-P, ISAC
®
-S, EPIC
®
are registered trademarks of Siemens AG
Semiconductor Group
3
S/T Bus Interface Circuit
(SBC)
Preliminary Data
1
Features
CCITT I.430
Conversion of the frame structure between the S/T and
IOM
®
interfaces
D-channel access control
Activation and deactivation procedures according to
CCITT I.430
Built-in wake-up unit for activation from power-down state
Adaptively switched receive thresholds
Control via IOM interface
Several operating modes
Receive timing recovery according to selected operating
mode
Frame alignment with absorption of phase wander in trunk
line applications
Switching of test loops
Advanced CMOS technology
Low power consumption:
PEB 2080:
standby less than 5 mW
active max. 65 mW
PEF 2080:
standby less than 6.5 mW
active max. 70 mW
PEB 2080
PEF 2080
CMOS IC
q
Full duplex 2B + D S/T-interface transceiver according to
q
q
q
q
q
q
q
q
q
q
q
q
P-LCC-28-R
P-DIP-22
Type
PEB 2080-N
PEB 2080-P
PEF 2080-N
Ordering Code
Q67100-H8395
Q67100-H2954
Q67100-H6097
Package
P-LCC-28-R (SMD)
P-DIP-22
P-LCC-28-R (SMD)
Semiconductor Group
5
06.92
Features
The S-Bus Interface Circuit (SBC) PEx 2080 implements the four-wire S/T-interface used to link
voice/data terminals to an ISDN. Through selection of operating mode, the device may be employed
in all types of applications involving an S interface. Two or more SBC´s can be used to build a point-
to-point, passive bus, extended passive bus or star configuration.
Specific ISDN applications of the SBC include: ISDN terminals, ISDN network termination (Central
Office and PABX applications), and PABX trunk lines to Central Office.
The device provides all electrical and logical functions according to CCITT recommendation I.430.
These include: mode-dependent receive timing recovery, D-channel access and priority control,
and automatic handling of activation/deactivation procedures. The SBC does not require direct
microprocessor control.
The SBC is an IOM compatible, 22-pin CMOS device. It operates from a single + 5 V supply and
features a power-down state with very low power consumption.
Semiconductor Group
6
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