Maxim DS21Q55 specifications AC Timing Parameters and Diagrams, Parameter Symbol MIN TYP MAX Units

Product Preview DS21Q55

34. AC TIMING PARAMETERS AND DIAGRAMS

Capacitive test loads are 40pF for bus signals, 20pF for all others.

34.1 Multipexed Bus AC Characteristics

AC CHARACTERISTICS–MULTIPLEXED PARALLEL PORT (MUX = 1) (0°C to +70°C; VDD = 3.3V ± 5% for DS21Q55;

-40°C to +85°C; VDD = 3.3V ± 5% for DS21Q55N)

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Cycle Time	TCYC	200			ns
Pulse Width, DS Low or RD*	PWEL	100			ns
High
Pulse Width, DS High or RD*	PWEH	100			ns
Low
Input Rise/Fall Times	TR, tF			20	ns
R/W* Hold Time	TRWH	10			ns
R/W* Setup Time Before DS	TRWS	50			ns
High
CS* Setup Time Before DS,	tCS	20			ns
WR* or RD* Active
CS* Hold Time	tCH	0			ns
Read Data Hold Time	TDHR	10		50	ns
Write Data Hold Time	TDHW	5			ns
Muxed Address Valid to AS or	TASL	15			ns
ALE Fall
Muxed Address Hold Time	TAHL	10			ns
Delay Time DS, WR*, or RD*	TASD	20			ns
to AS or ALE Rise
Pulse Width AS or ALE High	PWASH	30			ns
Delay Time, AS or ALE to DS,	TASED	10			ns
WR* or RD*
Output Data Delay Time from	TDDR			80	ns
DS or RD*
Data Setup Time	TDSW	50			ns
See Figures 37-1 to 37-3

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