S39421 View Datasheet(PDF) - Summit Microelectronics

Part Name

Description

Manufacturer

S39421

Hot Swap Voltage Controller

Summit Microelectronics 

S39421

RESET

I/Oe

ASIC I/Oa

I/Ob

I/Oc

I/Od

RESET

DD

SK

DO

DI

CS

2024 ILL11.0

FIGURE 15. DOWNLOAD ENABLED IN CONJUNCTION WITH RESET RELEASE

Figure 15 is a good implementation to use whenever there is a requirement to download data from the memory after

any reset cycle. This provides control of the DD input function after power-on, brown-out or a system induced reset

condition. In this way the data download function is ready under any circumstance an ASIC or MCU might need to

reload initialization data.

VCC

RESET

DD

CS

SK

DO

DD Mode

Enabled

DD Mode

Disabled

Dummy 0

Data From

Address 000

Data From

Address 001

Data From

Address 1FE

Data From

Address 1FF

2024 ILL12.0

FIGURE 16. DD CIRCUIT 4 TIMING SEQUENCE DIAGRAM

2024 9.0 8/8/00

15

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