psf21911 ETC-unknow, psf21911 Datasheet - Page 19

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

Semiconductor Group
Pin No.
P-LCC-44 T-QFP64
32
12
34
54
24
57
6, 9, 11,
15, 20, 25,
27, 31, 33,
34, 40, 48,
49, 50, 51,
63, 64
Symbol
Stand-
alone
CLS
PMOD
E
MTO
not
used
µP
mode
ALE
CCLK
CLS
PMODE I
RD
DS
not used I
not used
I/O
I
I
O
(PD)
I
(PD)
I
I
19
Function
Address Latch Enable
(Demultiplexed mode): ALE tied to
GND selects the Siemens/Intel type.
ALE tied to VDD selects the Motorola
type.
Controller Data Clock
(Serial mode): Shifts data from (1) and
to (0) the device.
Clock Signal
A 7.68MHz clock, synchronous to the
U-interface, is provided on this pin.
Processor Interface Enable
Setting PMODE to “1“ enables the
Processor Interface. Tie to GND or do
not connect to select stand-alone
mode. Internal pull down.
Monitor Procedure Time-Out
Disables the internal 6 ms Monitor
time-out when set to (1). Internal pull-
down resistor.
Read
(Siemens/Intel multiplexed and
demultiplexed modes): indicates a
read operation, active low.
Data Strobe
(Motorola demultiplexed mode):
indicates a data transfer, active low.
(Serial mode) tie to GND.
Leave open for future compatibility.
Pin Definitions and Functions
PSB 21911
PSF 21911
11.97