Technical data

Analog Integrated Circuit Device Data
16 Freescale Semiconductor
908E621
DYNAMIC ELECTRICAL CHARACTERISTICS
SPI INTERFACE TIMING
SPI Operating Recommended Frequency
(30)
f
SPIOP
0.25 — 4.0 MHz
State Machine
Reset Low-Level Duration after VDD High t
RST
0.8 1.25 1.94 ms
Normal Request Time-out t
NORMREQ
51 80 124 ms
Window Watchdog Timer
(31)
Watchdog Period (WDP1:0 = 00) t
WD80
52 80 124 ms
Watchdog Period (WDP1:0 = 01) t
WD40
26 40 62 ms
Watchdog Period (WDP1:0 = 10) t
WD20
13 20 31 ms
Watchdog Period (WDP1:0 = 11) t
WD10
6.5 10 15.5 ms
Notes
30. This parameter is guaranteed by process monitoring but is not production tested.
31. This parameter is guaranteed only if correct trimming was applied. Additionally See Watchdog Period Range Value (AWD Trim) on page
49
Table 4. Dynamic Electrical Characteristics (continued)
All characteristics are for the analog chip only. Please refer to the 68HC908EY16 datasheet for characteristics of the
microcontroller chip. Characteristics noted under conditions 9.0 V ≤ V
SUP
≤ 16 V, -40°C ≤ T
J
≤ 125°C unless otherwise noted.
Typical values noted reflect the approximate parameter mean at T
A
= 25°C under nominal conditions unless otherwise noted.
Characteristic Symbol Min Typ Max Unit