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DS1200
AC ELECTRICAL CHARACTERISTICS
(0oC to +70oC; V CC = 5V ± 10%)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Data to CLK Setup
Data to CLK Hold
Data to CLK Delay
CLK Low Time
CLK High Time
t DC
tCDH
t CDD
t CL
t CH
35
40
125
125
125
ns
ns
ns
ns
ns
3, 9
3, 9
3, 4, 6, 9
3, 9
3, 9
CLK Frequency
CLK Rise and Fall
f CLK
t R , t F
DC
4.0
500
MHz
ns
3, 9
9
RST
to Clock Setup
t CC
1
μs
3, 9
CLK to RST Hold
t CCH
40
ns
3, 9
RST
RST
Inactive Time
to I/O High-Z
t CWH
t CDZ
125
50
ns
ns
3, 9, 14
3, 9
NOTES:
1) All voltages and resistances are referenced to ground.
2) Input levels apply to CLK, DQ, and RST while V CC is not connected to the tag, then RST input
reverts to V IHE .
3) Measured at V IH = 2.0 or V IL = 0.8V and 10ns maximum rise and fall time.
4) Measured at V OH = 2.4V and V OL = 0.4V.
5) For CLK, DQ, RST , and V CC at 5V.
6) Load capacitance = 50pF.
7) Applies to RST when V CC < 3.8V.
8) Measured with outputs open.
9) Measured at VIH of RST greater than or equal to 3.8V when RST supplies power.
10) Logic 1 maximum is V CC + 0.3V if the V CC pin supplies power and RST +0.3V if the RST pin
supplies power.
11) RST logic 1 maximum is V CC + 0.3V if the V CC pin supplies power and 5.5V maximum if RST
supplies power.
12) Each DS1200 is marked with a four-digit date code AABB. AA designates the year of manufacture.
BB designates the week of manufacture. The expected t DR is defined as starting at the date of
manufacture.
13) Average AC RST current can be determined using the following formula:
I TOTAL = 2 + I LOAD DC + (4 x 10 -3 )(CL + 140)f
I TOTAL and I LOAD are in mA; CL is in pF; f is in MHz.
Applying the above formula, a load capacitance of 50pF running at a frequency of 4.0MHz gives an
I TOTAL current of 5mA.
14) When RST is supplying power, t CWH must be increased to 100ms.
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