prel

imin

ary

prel

imin

ary

iC-MCW

BiSS WATCHDOG FOR RS422 WITH SPI

Rev A1, Page 9/22

OPERATING REQUIREMENTS: Host Interface, SPI mode

Operating Conditions: VDD = VDDA = 3.0 ... 5.5 V, Tj = -40 ... 125 °C;

Lo Input Level = 0 V, Hi Input Level = VDD, Lo Output Level = 0 V, Hi Output Level = VDD

Capacitive Load at MISO = 20pF

Item

Symbol

Parameter

Conditions

Unit

No.

Min.

Max.

Permissible Cycle Time

100

ns

Wait Time:

NCS lo → hi to NCS hi → lo

100

ns

Setup Time:

NCS lo before SCLK lo → hi

50

ns

Propagation Delay:

MISO stable after NCS hi → lo

50

ns

Propagation Delay:

MISO hiZ after NCS lo→ hi

50

ns

Hold Time:

NCS lo after SCLK lo → hi

50

ns

Setup Time:

MOSI stable before SCLK lo → hi

10

ns

Hold Time:

MOSI stable after SCLK lo → hi

10

ns

Propagation Delay:

MISO stable after SCLK hi → lo

47

ns

SCLK

NCS

MOSI

MISO

t

W1

t

S1

t

t

C1

t

P1

t

P2

t

P4

MSB in

LSB in

MSB out

LSB out

t

H1

Figure 3: SPI Access