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PDF PEB2245 Data sheet ( Hoja de datos )
| Número de pieza | PEB2245 | |
| Descripción | Multipoint Switching and Conferencing Unit - Attenuation MUSAC | |
| Fabricantes | Siemens Semiconductor Group | |
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ICs for Communications
Multipoint Switching and Conferencing Unit - Attenuation
MUSAC
PEB 2245 Version 1.2
Data Sheet 03.96
T2245-XV12-D1-7600
1 page  
PEB 2245
1 Overview
A Complete Family of Efficient Solutions
If the issue is digital switching and conferencing, the solution is flexibility, capacity, and economy.
Siemens Semiconductor offers the most economical answer to all conceivable applications in this
field. Our complete family of switching network devices satisfies even the most rigorous switching
demands.
A Complete Family of Efficient Solutions
Take our MTSC (Memory Time Switch CMOS) PEB 2045 with a switching capability of 512
incoming PCM channels to 256 outgoing PCM channels. It has the perfect size to economically
build medium sized switches. The design of a non-blocking switch for 512 PCM channels is possible
with a simple parallel configuration with a second MTSC.
If you need a non-blocking switch for up to 256 channels, we offer a smaller version of the MTSC,
the MTSS (Memory Time Switch Small) PEB 2046. And the MTSL (Memory Time Switch Large)
PEB 2047, the largest in our family, is capable of switching 1024 PCM channels.
Siemens also supplies the best solution for conferencing, our MUSAC (Multipoint Switching and
Conferencing Unit) PEB 2245 performs the complete switching functions of the MTSC, and offers
a signal processor for handling up to 64 conferencing channels in any combination. The input and
output channels can also be attenuated individually to achieve best transmission quality.
The MUSAC-A (Multipoint Switching and Conferencing Unit) PEB 2445 is an upward
compatible device to the MTSC and MUSAC. It offers in addition the attenuation and amplification
of every time slot.
Pin compatible device allow simplicity in hardware and software design. To allow for more flexibility,
the PCM data rate can be 2, 4, or 8 Mbit/s – configurable also for mixed use.
Semiconductor Group
5
5 Page 
PEB 2245
Pin Definitions and Functions (cont’d)
Pin No. Symbol
24 RD
DS
25 WR
R/W
2 ALE
26 AD0
27 AD1
29 AD2
30 AD3
31 AD4
32 AD5
33 AD6
34 AD7
35 OUT7
36 OUT6
37 OUT5
38 OUT4
40 OUT3
41 OUT2
42 OUT1
43 OUT0
Input (I)
Output (O)
I
I
I
I
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
O
Function
Read: This signal indicates a read operation and is
internally sampled only if CS is active. The MUSAC puts
data from the selected internal register on the data bus
with the falling edge of RD. RD is active low (Siemens/
Intel bus mode).
Data Strobe: The rising edge marks the end of a valid
read or write operation (Motorola bus mode).
Write: This signal initiates a write operation. The WR
input is internally sampled only if CS is active. In this
case the MUSAC loads an internal register with data
from the data bus at the rising edge of WR. WR is active
low (Siemens/Intel bus mode).
Read/Write: When “high”, identifies a valid µP access as
a read operation. When “low”, identifies a valid µP
access as a write operation (Motorola bus mode).
Address Latch Enable: In the Intel type multiplexed µP-
interface mode a logical high on this line indicates an
address of an MUSAC internal register on the external
address/data bus. In the Intel type demultiplexed µP-
interface mode this line is hardwired to VSS, in the
demultiplexed Motorola type µP-interface mode it should
be connected to VDD.
Address Data Bus: If the multiplexed address/data µP-
interface bus mode is selected these pins transfer data
and addresses between the µP and the MUSAC.
If a demultiplexed mode is used, these bits interface with
the system data bus.
PCM-Output Port: Serial data is sent by these lines at
standard CMOS- or TTL levels. These pins can be
tristated.
Semiconductor Group
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PEB2245.PDF ] | |
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