PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 43

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

Pin No.
P-LCC-44
34
20
2.2.2.4
1, 2
5
7, 8
9
13
16
23
Semiconductor Group
Power Supply Pins
Pin No.
T-QFP64
M-QFP64
57
37
7, 8, 12
14
18, 19
21
26
30
41
Symbol
not used I
RD
DS
CCLK
(Mode
Select)
ALE
V
GNDA1
V
V
V
GNDA2
GNDD
DDD
DDA1
REF
DDA2
Input (I)
Output (O)
I
I
I
I
I
O
I
I
I
43
Function
(Serial mode) tie to GND.
Read (Siemens/Intel multiplexed and
demultiplexed modes): indicates a
read operation, active low.
Data Strobe (Motorola demultiplexed
mode): indicates a data transfer, active
low.
Controller data clock (Serial mode):
Shifts data from or to the device.
Mode Selection (Demultiplexed mode):
ALE tied to GND selects the
Siemens/Intel type. ALE tied to VDD
selects the Motorola type.
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.
5 V
0 V analog
5 V
V
voltage. Connect a capacitor of 100 nF
to GND
5 V
0 V analog
0 V digital
REF
pin to buffer internally generated
5% digital supply voltage
5% analog supply voltage
5% analog supply voltage
Pin Descriptions
Data Sheet 01.99
PEB 2091
PEF 2091