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參數(shù)資料
| 型號(hào)： | LTC4300A-3IDD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Level Shifting Hot Swappable 2-Wire Bus Buffer with Enable |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 3 MM, PLASTIC, MO-229-WEED, DFN-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 198K |
| 代理商： | LTC4300A-3IDD |
LTC4300A-3
8
sn4300a3 4300a3fs
temperature and the pull-up resistors and equivalent bus
capacitances on both sides of the bus. The Typical Perfor-
mance Characteristics section shows t
PHL
as a function of
temperature and voltage for 10k pull-up resistors and
100pF equivalent capacitance on both sides of the part. By
comparison with Figure 2, the V
CC
= V
CC2
= 3.3V curve
shows that increasing the capacitance from 50pF to 100pF
results in a propagation delay increase from 55ns to 75ns.
Larger output capacitances translate to longer delays (up
to 150ns). Users must quantify the difference in propaga-
tion times for a rising edge versus a falling edge in their
systems and adjust setup and hold times accordingly.
Rise-Time Accelerators
Once connection has been established, rise-time accelera-
tor circuits on all four SDA and SCL pins are activated.
These allow the user to choose weaker DC pull-up currents
on the bus, reducing power consumption while still meet-
ing system rise-time requirements. During positive bus
transitions, the LTC4300A-3 switches in 2mA (typical) of
current to quickly slew the SDA and SCL lines once their
DC voltages exceed 0.6V. Using a general rule of 20pF of
capacitance for every device on the bus (10pF for the
device and 10pF for interconnect), choose a pull-up cur-
rent so that the bus will rise on its own at a rate of at least
1.25V/
μ
s to guarantee activation of the accelerators.
For example, assume an SMBus system with V
CC
= 3V, a
10k pull-up resistor and equivalent bus capacitance of
200pF. The rise-time of an SMBus system is calculated
from (V
IL(MAX)
– 0.15V) to (V
IH(MIN)
+ 0.15V), or 0.65V to
2.25V. It takes an RC circuit 0.92 time constants to
traverse this voltage for a 3V supply; in this case, 0.92
(10k 200pF) = 1.84
μ
s. Thus, the system exceeds the
maximum allowed rise-time of 1
μ
s by 84%. However,
using the rise-time accelerators, which are activated at a
DC threshold of below 0.65V, the worst-case rise-time is:
(2.25V – 0.65V) 200pF/1mA = 320ns, which meets the
1
μ
s rise-time requirement.
ENABLE Low Current Disable
Grounding the ENABLE pin disconnects the backplane
side from the card side, disables the rise-time accelera-
tors, disables the bus precharge circuitry and puts the part
in a near-zero current state. When the pin voltage is driven
all the way to V
CC
, the part waits for data transactions on
both the backplane and card sides to be complete (as
described in the Start-Up section) before reconnecting the
two sides.
OPERATIOU
Figure 1. Input–Output Connection Low to High Transition
Figure 2. Input–Output Connection High to Low Transition
OUTPUT
SIDE
50pF
INPUT
SIDE
150pF
INPUT
SIDE
150pF
0.5V/DIV
OUTPUT
SIDE
50pF
0.5V/DIV
200ns/DIV
4300A-3 F01
200ns/DIV
4300A-3 F02
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| LTC4300A-3IDD#PBF | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4300A-3IDD#TR | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4300A-3IDD#TRPBF | 功能描述:IC BUFFER BUS HOTSWAP 2WR 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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