33911 datasheet(13/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 4. Dynamic Electrical Characteristics

Characteristics noted under conditions 5.5V

≤ V

SUP ≤ 18V, -40°C ≤ TA ≤ 125°C for the 33911 and -40°C ≤ TA ≤ 85°C for the

34911, otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions,

unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

SPI INTERFACE TIMING (see Figure 13, page 19

)

SPI Operating Frequency

fSPIOP

––

4.0

MHz

SCLK Clock Period

tPSCLK

250

–

N/A

SCLK Clock High Time(42)

tWSCLKH

110

–

N/A

SCLK Clock Low Time(42)

tWSCLKL

110

–

N/A

Falling Edge of CS to Rising Edge of SCLK(42)

tLEAD

100

–

N/A

Falling Edge of SCLK to CS Rising Edge(42)

tLAG

100

–

N/A

MOSI to Falling Edge of SCLK(42)

tSISU

–

N/A

Falling Edge of SCLK to MOSI(42)

tSIH

–

N/A

MISO Rise Time(42)

CL = 220pF

tRSO

–

MISO Fall Time(42)

CL = 220pF

tFSO

–

Time from Falling or Rising Edges of CS to:(42)

- MISO Low-impedance

- MISO High -impedance

tSOEN

tSODIS

0.0

–

Time from Rising Edge of SCLK to MISO Data Valid(42)

0.2 x VDD ≤ MISO ≥ 0.8 x VDD, CL = 100pF

tVALID

0.0

–

RST OUTPUT PIN

Reset Low-Level Duration after VDD High (see Figure 12, page 19)

tRST

0.65

1.0

1.35

Reset Deglitch Filter Time

tRSTDF

350

600

900

WINDOW WATCHDOG CONFIGURATION PIN (WDCONF)

Watchdog Time Period (43)

External Resistor REXT = 20kΩ (1%)

External Resistor REXT = 200kΩ (1%)

Without External Resistor REXT (WDCONF pin open)

tPWD

8.5

110

150

11.5

108

205

Notes

42.

This parameter is guaranteed by process monitoring but not production tested.

43.

Watchdog timing period calculation formula: tPWD [ms] = 0.466 * (REXT - 20) + 10 (REXT in kΩ)

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