PEB2254H-V14 Infineon Technologies, PEB2254H-V14 Datasheet - Page 9

• Manufacturer Part Number: PEB2254H-V14
• Manufacturer: Infineon Technologies

Specifications of PEB2254H-V14

• Operating Supply Voltage (typ): 5V
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

1.2
Pin No.
42 … 48
41 … 38
35 … 28
25 … 22
49
Semiconductor Group
Pin Definitions and Functions
Symbol
A0 … A6
D0 … D3
D4 … D11
D12 … D15
ALE
Input (I)
Output (O)
I
I/O
I
Function
Address Bus
These inputs interface with seven bits of the
system’s address bus to select 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.
For detailed information, refer to chapter 1.6.
Address Latch Enable
A high on this line indicates an address on the
external address/data bus. The address
information provided on lines A0 … A6 is
internally latched with the falling edge of ALE.
This function allows the FALC54 to be directly
connected to a multiplexed address/data bus. In
this case, pins A0 … A6 must be externally
connected to the Data Bus pins. In case of
demultiplexed mode this pin has to be
connected directly to ground or VDD. For
detailed information, refer to chapter 1.6.
D8 … D15 are in high impedance and have to
be connected to
9
V
DD
or
V
General Features E1
SS
.
PEB 2254
11.96