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參數(shù)資料
| 型號： | DS28CM00R-A00+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/9頁 |
| 文件大小： | 0K |
| 描述： | IC SILICON SERIAL NUMBER SOT23-5 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 硅序列號 |
| 應(yīng)用： | PCB，網(wǎng)絡(luò)節(jié)點(diǎn)，設(shè)備識別/注冊 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SC-74A，SOT-753 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-5 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | DS28CM00R-A00+TDKR |
DS28CM00: IC/SMBus Silicon Serial Number
9 of 9
Figure 6. Application Schematic
VCC
SDA
SCL
C
GND
VCC
SDA
SCL
DS28CM00
GND
RP
VCC
To additional
devices
For IC systems, the rise time and fall time are measured from 30% to 70% of the pullup voltage. The maximum
bus capacitance CB is 400pF. The maximum rise time must not exceed 300ns. Assuming maximum rise time, the
maximum resistor value at any given capacitance CB is calculated as: RPMAX = 300ns/(CB*ln(7/3)). For a bus
capacitance of 400pF the maximum pullup resistor would be 885
Ω.
Since a 885
Ω pullup resistor, as would be required to meet the rise time specification and 400pF bus capacitance,
is lower than RPMIN at 5.25V, a different approach is necessary. The "Max. Load…" line in Figure 7 is generated by
first calculating the minimum pullup resistor at any given operating voltage ("Minimum RP" line) and then calculating
the respective bus capacitance that yields a rise time of 300ns.
Only for pullup voltages of 4V and lower can the maximum permissible bus capacitance of 400pF be maintained. A
reduced bus capacitance of 300pF is acceptable for the entire operating voltage range. The corresponding pullup
resistor value at the voltage is indicated by the "Minimum RP" line.
Figure 7. IC Fast Speed Pullup Resistor Selection Chart
0
200
400
600
800
1000
1200
1.5
2
2.5
3
3.5
4
4.5
5
Pull-up Voltage
M
in
imu
m
R
p
(
O
h
m
s
)
0
100
200
300
400
500
600
Loa
d
(
pF)
"Minimum Rp"
Max. Load at Min. Rp fast mode
PACKAGE INFORMATION
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo
.)
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