PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 13
PEB22554
Manufacturer Part Number
PEB22554
Description
ICs for Communications
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.PEB22554.pdf
(397 pages)
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2.2
Pin No.
83 - 74
107 - 103
100 - 93
90 - 88
62
Note: All unused input pins have to be connected to a defined level (
Note: PU = If not connected an internal pull-up transistor ensure high input level.
Semiconductor Group
Pin Definitions and Functions
Symbol
D15 … D11
D10 … D3
D2 … D0
A9 … A0
ALE
Input (I)
Output (O)
I
I/O
I
Function
Address Bus
Address bus selects one of the internal
registers for read or write.
Data Bus
Bi-directional three-state data lines which
interface with the system’s data bus. Their
configuration is controlled by the level of pin
DBW:
– 8-bit mode (DBW = 0): D0 … D7 are active.
– 16-bit mode (DBW = 1): D0 … D15 are active.
In case of byte transfers, the active half of the
bus is determined by A0 and BHE/BLE and the
selected bus interface mode (via pin IM). The
unused half is in high impedance.
Address Latch Enable
A high on this line indicates an address on the
external address/data bus. The address
information provided on lines A0 … A9 is
internally latched with the falling edge of ALE.
This function allows the QuadFALC to be
directly connected to a multiplexed address/data
bus. In this case, pins A0 … A9 must be
externally connected to the Data Bus pins. In
case of demultiplexed mode this pin has to be
connected directly to ground or
D8 … D15 are in high impedance and have to
be connected to
13
V
DD
or
V
Pin Descriptions E1
SS
.
V
V
SS
DD
/
.
PEB 22554
V
DD
)
09.98
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