ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 4. Dynamic Electrical Characteristics
Characteristics noted under conditions 5.5V ≤ VSUP ≤ 18V, -40°C ≤ TA ≤ 125°C for the 33912 and -40°C ≤ TA ≤ 85°C for the
34912, unless otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal
conditions, unless otherwise noted.
Characteristic
SPI INTERFACE TIMING (SEE Figure 13, PAGE 20)
SPI Operating Frequency
Symbol
Min
Typ
Max
Unit
f
t
–
–
–
–
–
–
–
–
–
4.0
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MHz
ns
SPIOP
SCLK Clock Period
250
110
110
100
100
40
CLK
PS
SCLK Clock High Time(41)
t
ns
SCLKH
W
SCLK Clock Low Time(41)
t
ns
SCLKL
W
Falling Edge of CS to Rising Edge of SCLK(41)
Falling Edge of SCLK to CS Rising Edge(41)
MOSI to Falling Edge of SCLK(41)
Falling Edge of SCLK to MOSI(41)
MISO Rise Time(41)
t
ns
LEAD
tLAG
ns
t
ns
SISU
t
40
ns
SIH
tRSO
ns
C = 220pF
L
–
–
40
40
–
–
MISO Fall Time(41)
t
ns
ns
FSO
C = 220pF
L
Time from Falling or Rising Edges of CS to:(41)
- MISO Low-impedance
t
0.0
0.0
–
–
50
50
SOEN
- MISO High-impedance
t
SODIS
Time from Rising Edge of SCLK to MISO Data Valid(41)
t
ns
VALID
0.2 x VDD ≤ MISO ≥ 0.8 x VDD, CL = 100pF
0.0
–
75
RST OUTPUT PIN
Reset Low-level Duration After VDD High (see Figure 12, page 20)
Reset Deglitch Filter Time
t
0.65
350
1.0
1.35
900
ms
ns
RST
t
600
RSTDF
WINDOW WATCHDOG CONFIGURATION PIN (WDCONF)
Watchdog Time Period(42)
t
ms
PWD
External Resistor REXT = 20kΩ (1%)
External Resistor REXT = 200kΩ (1%)
Without External Resistor REXT (WDCONF Pin Open)
8.5
79
10
94
11.5
108
205
110
150
CURRENT SENSE AMPLIFIER(41)
Common Mode Rejection Ratio
Supply Voltage Rejection Ratio(43)
Gain Bandwidth Product
Output Slew-Rate
CMR
SVR
GBP
SR
70
60
–
–
–
–
–
–
dB
dB
0.75
0.5
3.0
–
MHz
V/µs
Notes
41. This parameter is guaranteed by process monitoring but not production tested.
42. Watchdog timing period calculation formula: tPWD [ms] = 0.466 * (REXT - 20) + 10 (REXT in kΩ)
43. Analog Outputs are supplied by VDD
33912
Analog Integrated Circuit Device Data
Freescale Semiconductor
14
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