Interface Timing Characteristics-25 Kω, 250 Kω Versions - Analog Devices AD5235 Manual

INTERFACE TIMING AND EEMEM RELIABILITY CHARACTERISTICS—25 KΩ, 250 KΩ VERSIONS
Guaranteed by design and not subject to production test.
See the Timing Diagrams section for the location of measured values. All input control voltages are specified with t
90% of 3 V) and timed from a voltage level of 1.5 V. Switching characteristics are measured using both V
Table 2.
Parameter
Clock Cycle Time (t )
CYC
CS Setup Time
CLK Shutdown Time to CS Rise
Input Clock Pulse Width
Data Setup Time
Data Hold Time
CS to SDO-SPI Line Acquire
CS to SDO-SPI Line Release
CLK to SDO Propagation Delay
CLK to SDO Data Hold Time
3
CS High Pulse Width
3
CS High to CS High
RDY Rise to CS Fall
CS Rise to RDY Fall Time
4
Store/Read EEMEM Time
CS Rise to Clock Rise/Fall Setup
Preset Pulse Width (Asynchronous)
Preset Response Time to Wiper Setting
Power-On EEMEM Restore Time
FLASH/EE MEMORY RELIABILITY
5
Endurance
6
Data Retention
1
Typicals represent average readings at 25°C and V
2 Propagation delay depends on the value of V
3
Valid for commands that do not activate the RDY pin.
RDY pin low only for Instructions 2, 3, 8, 9, 10, and the PR hardware pulse: CMD_8 ~ 1 ms; CMD_9, 10 ~ 0.1 ms; CMD_2, 3 ~ 20 ms. Device operation at T
4
V < 3 V extends the save time to 35 ms.
DD
5 Endurance is qualified to 100,000 cycles per JEDEC Standard 22, Method A117 and measured at −40°C, +25°C, and +85°C; typical endurance at +25°C is 700,000 cycles.
6
Retention lifetime equivalent at junction temperature (T
derates with junction temperature in the Flash/EE memory.
Symbol Conditions
t
1
t
2
t
3
t , t Clock level high or low
4 5
t From positive CLK transition
6
t From positive CLK transition
7
t
8
t
9
2
t R
10 P
t R
11 P
t
12
t
13
t
14
t
15
t Applies to instructions 0x2, 0x3, and 0x9
16
t
17
t Not shown in timing diagram
PRW
t PR pulsed low to refresh wiper positions
PRESP
t
EEMEM1
= 5 V.
DD
, R , and C .
DD PULL-UP L
) = 55°C per JEDEC Standard 22, Method A117. Retention lifetime based on an activation energy of 0.6 eV
J
= 2.2 kΩ, C < 20 pF
L
= 2.2 kΩ, C < 20 pF
L
Rev. B | Page 5 of 28
AD5235
= t = 2.5 ns (10% to
R F
= 3 V and 5 V.
DD
1
Min Typ Max Unit
20 ns
10 ns
1 t
CYC
10 ns
5 ns
5 ns
40 ns
50 ns
50 ns
0 ns
10 ns
4 t
CYC
0 ns
0.15 0.3 ms
30 ms
10 ns
50 ns
140 µs
140 µs
100 kCycles
100 Years
= −40°C and
A