BU9831 Datasheet, PDF (7/13 Pages) Rohm – Non-volatile electronic potentiometer

Memory ICs
(unless otherwise noted, Ta = – 20 to + 85°C, VCC = 5V ± 10%)
Parameter
Symbol Min. Typ. Max. Unit
CS setup time
tCSS 400 —
—
ns
CS hold time
tCSH
0
— — ns
Data setup time
tDIS 300 —
—
ns
Data hold time
tDIH 300 —
—
ns
DO rise delay time
tPD1
—
— 700 ns
DO fall delay time
tPD0
—
— 700 ns
Self-timed programming cycle
tE / W — — 15 ms
CS minimum HIGH time
tCS
2
—
—
µs
Time during which READY / BUSY display is effective tSV
—
—
2
µs
Time that DO is HIGH-Z from (CS)
tOH
0
— 800 ns
Data clock HIGH time
tWH 900 —
—
ns
Data clock LOW time
tWL 900 —
—
ns
Resistance value stabilization time
tAW
—
— 1000 µs
BU9831 / BU9831F
•^{Synchronous data I / O timing}
CS
SK
Input DIO
Output DIO
t CSS
t WL
t DIS
t PD
t WH
t DIH
t PD
t CS
t CSH
t OH
Fig. 10 Synchronous data I / O timing
á­ºReading of input data is done at the rising edge of SK.
á­ºOutput of data is synchronized to the falling edge of SK.
á­ºBetween commands, CS should be set to HIGH for longer than tCS.
If CS remains LOW, the next command cannot be received.
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