mt90528ag2 Zarlink Semiconductor, mt90528ag2 Datasheet - Page 183
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mt90528ag2
Manufacturer Part Number
mt90528ag2
Description
28-port Primary Rate Circuit Emulation Aal1 Sar
Manufacturer
Zarlink Semiconductor
Datasheet
1.MT90528AG2.pdf
(195 pages)
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8.0
8.1
8.1.1
To prevent device latch-up, it is recommended to turn on the I/O power (3.3 V) first, followed by the core power
(2.5 V). This can be done in one of two ways:
•
•
In general, the power-down sequence should be the reverse of the power-up sequence. Thus, the 2.5 V rail should
be turned off first, followed by the 3.3 V rail.
8.1.2
The MT90528 can interface with both the pipelined and flow-through types of synchronous static zero bus
turnaround (ZBT) RAM. The clock driving the external memory device must be the same as the clock which is fed
to the MT90528 at its MCLK input, as shown in Figure 67 below.
By powering up the 3.3 V rail first, preventing the 2.5 V rail from powering up until the 3.3 V rail is stable.
By placing a Schottky diode between the 3.3 V and 2.5 V power rails (connecting the anode to the 2.5 V rail
and the cathode to the 3.3 V rail).
Board-Level Applications
Applications
Power-Up and Power-Down Sequence
External Memory Interface Connections
MT90528
Figure 67 - External Memory Interface
mclk
Zarlink Semiconductor Inc.
MT90528
183
clk
SRAM
ZBT
Data Sheet
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