PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 33

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

2.2.1
(i.e. PMODE="0" or unconnected)
Pin No.
P-LCC-44
2.2.1.1
12
28
3
25
24
Semiconductor Group
Pin Definition in Stand-Alone Mode
Mode Selection Pins
Pin No.
T-QFP64
M-QFP64
24
47
10
44
43
Symbol
PMODE
RES
TSP
LT
BURST
Input (I)
Output (O)
I
I
I
I/O
I
33
Function
Processor Interface Enable: Tie to
GND or do not connect to select
stand-alone mode. Setting PMODE to
"1" enables the Processor Interface,
see "Pin Definition in Microprocessor
Mode", page 40.
Internal pull down.
Reset: Low active, must be (0) at least
for 30 ns, (see Table 4, page 53 for
complete description of available mode
configurations with this pin). The reset
in the LT and NT-PBX mode will be
carried out only after the clocks on the
IOM
IEC-Q. Tie to VDD if not used.
Single pulse test mode: For activation
refer to Table 4, page 53. When active,
alternating 2.5 V pulses are issued in
1.5 ms intervals. Tie to GND if not
used.
LT modes: Selects LT, COT 512/1536,
LT-RP (1) and non LT modes NT, TE,
NT-PBX, NT-RP (0). See Table 2,
page 51 for details on mode selection.
Selection of burst modes (LT, NT-PBX)
with (1) and non-burst modes (NT, TE,
COT-512/1536, LT/NT-RP) with (0).
See Table 2, page 51 for details on
mode selection.
®
-2 have been applied to the
Pin Descriptions
Data Sheet 01.99
PEB 2091
PEF 2091