psf21911 ETC-unknow, psf21911 Datasheet - Page 18

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

Semiconductor Group
Miscellaneous Function Pins
Pin No.
P-LCC-44 T-QFP64
10
11
17
29
20
22
23
32
51
37
Symbol
Stand-
alone
XOUT
XIN
DOD
TP
TP1
µP
mode
XOUT
XIN
WR
R/W
not used I
TP
ALE
I/O
O
I
I
I
I
I
(PD)
I
(PD)
I
18
Function
Crystal OUT
To connect 15.36-MHz crystal.
Leave open if not used.
Crystal IN
To connect 15.36-MHz crystal or
external 15.36-MHz clock.
DOUT Open Drain
Select open drain with DOD = (1)
(external pull-up resistor required) and
tristate with DOD = (0). See also
table 4 on page 27.
Write
(Siemens/Intel multiplexed and
demultiplexed modes): indicates a
write operation, active low.
Read/Write
(Motorola demultiplexed mode):
indicates a read (high) or write (low)
operation.
Test Pin
Not available to user. Do not connect.
Internal pull-down resistor.
Test Pin 1
Not available to user. Do not connect.
Internal pull-down resistor.
Address Latch Enable
(Multiplexed mode): In the Siemens/
Intel µP interface modes a high
indicates an address on the AD0..3
pins which is latched with the falling
edge of ALE (see also page 39).
(Serial mode) tie to GND.
Pin Definitions and Functions
PSB 21911
PSF 21911
11.97