PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 45

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

Pin No.
P-LCC-44
2.2.2.7
21
22
2.2.2.8
10
Semiconductor Group
Power Controller Pins
Clocks
Pin No.
T-QFP64
M-QFP64
38
39
22
Symbol
PS1
PS2
XOUT
Input (I)
Output (O)
I
I
O
45
Function
Power status (primary): Different
function in LT and NT mode. LT: (1)
indicates that the remote power is
switched off. (1) on PS1 results in C/I
message "HI". Clamp to low if not
used.
NT: (1) indicates that primary power
supply is OK. The pin value is identical
to the overhead bit "PS1" value.
Power status (secondary): Different
function in LT and NT mode. LT: the
current feed value is transmitted (8 bit
serially) from a power controller. Read
the value with MON-8 "RPFC". NT: (1)
indicates that secondary power supply
is OK. The pin value is identical to the
overhead bit "PS2" value.
Crystal OUT: 15.36-MHz crystal is
connected. Suitable load capacitances
should be connected in parallel. Their
value depends on the crystal chosen
and board Layout. See "Oscillator
Circuit and Crystal", page 252 for
details.
Leave open if not used.
Pin Descriptions
Data Sheet 01.99
PEB 2091
PEF 2091