SCF5249VM140 datasheet(28/56 Pages) FREESCALE

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SCF5249 Integrated ColdFire® Microprocessor Data Sheet, Rev. 3

Electrical Characteristics

Freescale Semiconductor

data from the JTAG logic. Shifting out of data depends on the state of the JTAG controller state machine

and the instruction currently in the instruction register. This data shift occurs on the falling edge of TCK.

When TDO is not outputting test data, it is three-stated. TDO can also be placed in three-state mode to

allow bussed or parallel connections to other devices having JTAG. This signal also provides single-bit

communication for the debug module responses.

8.21 Clock and Reset Signals

These signals configure the SCF5249 and provide interface signals to the external system.

8.21.1 Reset In

Asserting RSTI causes the SCF5249 to enter reset exception processing. When RSTI is recognized, the

data bus is tri-stated.

8.21.2 System Bus Input

The CRIN signal is the system clock input. The device has no on-chip clock oscillator, and needs an

external oscillator.

Electrical Characteristics

Table 15. Maximum Ratings

Rating

Symbol

Value

Units

Supply Core Voltage

Vcc

-0.5 to +2.5

Maximum Core Operating Voltage

Vcc

+1.98

Minimum Core Operating Voltage

Vcc

+1.62

Supply I/O Voltage

Vcc

-0.5 to +4.6

Maximum I/O Operating Voltage

Vcc

+3.6

Minimum I/O Operating Voltage

Vcc

+3.0

Input Voltage

Vin

-0.5 to +6.0

Storage Temperature Range

Tstg

-65 to150

Table 16. Operating Temperature

Characteristic

Symbol

Value

Units

Maximum Operating Ambient Temperature

TAmax

851

οC

Minimum Operating Ambient Temperature

TAmin

Note:

This published maximum operating ambient temperature should be used only as a system design guideline. All device

operating parameters are guaranteed only when the junction temperature does not exceed 105°C.

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