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2-5
Part 2: Interfacing and Configuring
T
DSU
T
DH
T
SH
T
SL
Direction
Step
T
DC
T
CHL
T
CHL
Channel
A
Channel B
Direction Change
T
SH
T
SL
T
DC
T
SH
T
SL
T
DC
Step Up
Step Down
STEP/DIRECTION TIMING
QUADRATURE TIMING
UP/DOWN TIMING
Figure 2.1.3: Clock Input Timing Characteristics
Clock Input Timing
Symbol Parameter
Type and Value
Step/Direction Step Up/Down Quadrature Units
T
DSU
T Direction Set Up 0 — — nS min
T
DH
T Direction Hold 50 — — nS min
T
SH
T Step High 250 250 — nS min
T
SL
T Step Low 250 250 — nS min
T
DL
T Direction Change — 250 250 nS min
T
CHL
T Channel High/Low — — 400 nS min
F
SMAX
F Step Maximum 5 2 — MHz Max
F
CHMAX
F Channel Maximum — — 1.25 MHz Max
F
ER
F Edge Rate — — 5 MHz Max
Parameter Turn On Turn Off µS
—
Enable On/Off 25 20 µS
Table 2.1.1: Input Clocks Timing Table