PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 24

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
1.5.2
Figure 5
1.5.3
The IEC-Q offers several special features to allow simple and cost effective design of
repeaters. Beside the microprocessor interface, free programming of maintenance bits
and special state machines for activation and deactivation control, the following three
features are of interest
• A wake-up tone from downstream is indicated directly on DOUT. No special circuit for
• A master clock is delivered on pin CLS in the NT Repeater mode. This allows reducing
• The undervoltage detection function can be used to detect power supply level drops
wake tone detection is needed. See "Upstream Wake-Up Indication in the LT
Repeater Mode", page 143.
power consumption to a minimum in power down. Furthermore, PLL architecture can
be simplified. See "Clocks", page 45.
on the board and reduce external reset circuitry. Refer to "Undervoltage Detection",
page 92.
a/b
a/b
a/b
a/b
PCM 4 with FAX/Modem Features
Repeater
SICOFI
PCM 4 Application
PEB 2466
®
-4 µC
PSB 7110
ISAR
IOM
Serial
®
24
-2
Parallel Interface
PEB 7274
ADPCM
Interface
PEB/F 2091
COT or TE
IEC-Q
Mode
µP
Data Sheet 01.99
Interface
PEB 2091
PEF 2091
U
Overview