DS2480B
AC ELECTRICAL CHARACTERISTICS
(VDD = 4.5V to 5.5V; -40°C to +85°C)
PARAMETER
UART Bit Time
SYMBOL
TT
MIN
8.68
8.68
8
TYP
MAX
104
104
20
UNITS NOTES
μs
μs
ns
ns
μs
μs
μs
μs
μs
μs
μs
6
6, 7, 16
8,17
8,17
9
Device Bit Time
Fall Time RXD
TR
tFR
Rise Time RXD
tRR
13
27
Transmit Idle Time
Receive Idle Time
Asymmetry
Arrival Response Time
Master Reset Time
Active Pullup on Time
Response Time
tIDLET
tIDLER
tASYM
tARR
tMR
tAPUOT
tRESP
0
tIDLET
1
52
10
11
4.4
104
12
0.5
2.0
13
11, 14
8.68 +
104 +
NOTES:
1. VPP - VPROG must be within 11.5V to 12.0V.
2. Applies only if a 12.0V supply is connected. If VPP and VDD are tied together, current is less than
1A.
3. Input load is to GND.
4. Voltage difference between VDD and 1-W.
5. Voltage difference between VPP and 1-W.
6. 8.68s (115.2kbps), 52s (19.2kbps), 17.36s (57.6kbps), 104s (9.6kbps).
7. Nominal values; tolerance = 5%.
8. At VCC = 5.0V and 100pF load to GND.
9. See Table 7, Function and Speed Matrix.
10. Independent of baud rate.
11. Minimum at 115.2kbps, maximum at 9.6kbps.
12. The master reset cycle is complete after tMR is over.
13. Minimum value at Overdrive speed; maximum value at standard speed.
14. is the time to complete the activity on the 1-Wire bus; values range from 0 (configuration
command) up to 5130s (alarming presence pulse).
15. With standard and flexible speed the total capacitive load of the 1-Wire bus should not exceed 20nF,
otherwise the active pullup on threshold VIAPO may not be reached in the available time. With
Overdrive speed the capacitive load on the 1-Wire bus must not exceed 1nF.
16. Baud rate calibration is valid at a static VDD operating point. Post calibration changes in VDD by more
than 5% may cause calibration error to exceed 5%. The DS2480B requires a 1-Wire reset command
sent by the host at a data rate of 9600bps for calibration. Data rates of 115200bps or higher during
calibration may put the DS2480B in an undefined state, requiring a power-down reset to restore
normal operation.
17. Not production tested.
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-“ in the package code
indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of
RoHS status.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
21-0041
8 SO
S8+5
31 of 32