DS1963S datasheet(36/37 Pages) DALLAS

36 / 37 page

DS1963S

36 of 37

NOTES

1) System requirement.

2) Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system

and 1-Wire recovery times. The specified value here applies to systems with only one device and

with the minimum 1-Wire recovery times. For more heavily loaded systems, an active pullup such

as that found in the DS2480 may be required.

3) Capacitance on the data pin could be 800pF when power is first applied. If a 2.2kW resistor is

used to pull up the data line to VPUP; the parasite capacitance will not affect normal

communications 2.5µs after power has been applied.

4) Input load is to ground.

5) All voltages are referenced to ground.

6) VTL, VTH are a function of the internal supply voltage.

7) Voltage below which, during a falling edge on IO, a logic 0 is detected.

8) The voltage on IO needs to be less or equal to VILMAX whenever the master drives the line low.

9) Voltage above which, during a rising edge on IO, a logic 1 is detected.

10) The I-V characteristic is linear for voltages less than 1V.

11) e is the time required for the pullup circuitry to pull the voltage on IO up from VIL to VTH.

12) d represents the time required for the pullup circuitry to pull the voltage on IO up from VIL to the

input high threshold of the bus master.

13) The number of SHA-1 computations possible with the built-in energy source depends on the

operating and storage temperature of the device.

14) Highlighted numbers are not in compliance with the published iButton standards. See comparison

tables below.

15) The recovery time was intentionally increased from the standard value of 1µs to a longer value to

improve the parasitic power supply of the device. This change improves the performance of the

chip and is not considered a non-compliance to the published standard.

Non-Compliance Table for TA = -40°C to +85°C

Standard Values

DS1963S Values

Parameter

Standard Speed

Overdrive Speed

Standard Speed

Overdrive Speed

Name

min

max

min

max

min

max

min

max

tSLOT (incl. tREC) 61µs

(undef.)

7µs

(undef.)

69µs

(undef.)

8µs

(undef.)

tRSTL

480µs

(undef.)

48µs

80µs

540µs

960µs

48µs

80µs

tPDH

15µs

60µs

2µs

6µs

17µs

60µs

1.8µs

6µs

tPDL

60µs

240µs

8µs

24µs

78µs

260µs

7.7µs

24µs

tW0L

60µs

120µs

6µs

16µs

64µs

120µs

6µs

15.4µs

tSLS, tSPD

15µs

60µs

2µs

6µs

19µs

64µs

2µs

4.8µs

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