SSC050-01 Datasheet, PDF (76/79 Pages) Maxim Integrated Products – Two-Wire Serial Backplane Controller

Electrical Characteristics
AC Characteristics
SSC050-01
Data Sheet
External Reset Circuit
The SSC050-01 supports an internal Power-On Reset circuit that eliminates the need for an external
reset source. However, the device does support a mechanism that allows the use of an external reset for
those applications where a system reset is available and required. The following diagrams show the
external connections required. The external reset source must be active high and does not need to be
synchronous to the clock source of the SSC050-01. TEST0 and TEST2 must remain at a low level
during the reset sequence. The minimum external reset pulse width is 50 nanoseconds. Two-wire serial
transactions to the SSC050-01 must not commence until a minimum of 500 nanoseconds after the
deassertion of the external reset pulse. Option 1 should be used when ASEL is normally held low (the
device type identifier value is 1000b). Option 2 should be used when ASEL is normally held high (the
device type identifier value is 1100b).
OPTION 1
SSC050-01
ASEL
Active High
System Reset
TEST1
OPTION 2
SSC050-01
Vdd
ASEL
Active High
System Reset
TEST1
Figure 5-5. External Reset Circuit Options
5-9
Revision 4.0
November 10, 2004