SA8702 Sames, SA8702 Datasheet

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SA8702

Manufacturer Part Number
SA8702
Description
BLOCK MODE TIME SLOT ALLOCATION CIRCUIT
Manufacturer
Sames
Datasheet
PIN CONNECTIONS
All inputs and outputs are C-MOS
compatible. All outputs are push-pull with
the exception of TSX which is open drain.
The inputs MRST and BCLK are Schmitt
Trigger. Inputs BL0 and BL1 have pull-ups.
(See figure 1).
DESCRIPTION
The SA8702 (BMTSAC) is a Block Mode
Time Slot Allocation Circuit. The device is
used to generate 8 consecutive timeslots
in one of 4 blocks in a 32 time-slot PCM
system. Each timeslot pulse is 8 BLCK
cycles long. BCLK is the 2,048 station
clock provided by the system. An active
MRST will disable all outputs until a valid
XSYNC input is recognised. The output
TSX is delayed by half a cycle and indicates
that one of 8 timeslots is currently active.
There are 4 possible modes of operation,
selectable by means of the BL0 and BL1
pins (See Table 1).
SA8702
sames
BLOCK MODE TIME SLOT ALLOCATION CIRCUIT
sames
1
APPLICATIONS
PCM Switching Systems
PCM Transmission Systems
Subscriber Multiplex Equipment
PBX Systems
Figure 1.
SA8702
SA8702
02.02.93

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SA8702 Summary of contents

Page 1

... BLOCK MODE TIME SLOT ALLOCATION CIRCUIT DESCRIPTION The SA8702 (BMTSAC Block Mode Time Slot Allocation Circuit. The device is used to generate 8 consecutive timeslots in one of 4 blocks time-slot PCM system. Each timeslot pulse is 8 BLCK cycles long. BCLK is the 2,048 station clock provided by the system ...

Page 2

... SA8702 Operating Modes BL1 BL0 Input pulse XSYNC occurs periodically in every frame and is used to generate the first of the eight timeslots and also defines the beginning of Block 0. If XSYNC fails high then the outputs will be generated as they were before the failure occured. ...

Page 3

... SS Symbol Min. Nom. V 4, 2,048 2,273 -10 25 Symbol Min. Nom SA8702 Max. Unit Conditions 0,5mA 0,5mA oh MHz 4, 5,25 70 °C - Max. Unit Conditions - ns ...

Page 4

... SA8702 PIN DESCRIPTION Pin No. I/O Name 1 O TSX 2 I MRST 3 O FSO 4 O FS1 5 O FS2 6 I BL0 7 I BL1 8 I VSS 9 I BCLK 10 I XSYNC 11 O FS7 12 O FS6 13 O FS5 14 O FS4 15 O FS3 16 I VDD sames Description An open drain N-channel high impedance, but pulls low during any active timeslot ...

Page 5

... TIMING DIAGRAM sames 5 SA8702 ...

Page 6

... SA8702 Disclaimer: The information contained in this document is confidential and proprietary to South African Micro- Electronic Systems (Pty) Ltd ("SAMES") and may not be copied or disclosed to a third party, in whole or in part, without the express written consent of SAMES. The information contained herein is current as of the date of publication ...

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