TI TCA9511A：热插拔I2C/SMBus双向缓冲器

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TI-TCA9511A是一款专为I2C总线设计的高性能缓冲器，它旨在解决在热插拔环境中进行数据传输时可能遇到的问题。这款器件的主要特点包括： 1. 双向数据传输支持：TCA9511A能够实现I2C总线信号的双向数据传输，这对于在服务器、企业交换机、电信交换设备、基站和工业自动化设备等应用中的数据通信至关重要。 2. 宽广的工作电压范围：它的供电电压支持2.3V至5.5V，适用于各种不同的系统电压需求，并且能承受-40°C至125°C的极端环境温度，确保了在严酷条件下仍能稳定工作。 3. 保护功能：通过1V预充电技术，防止在带电情况下插入板卡时对SDA和SCL线路造成损害，同时支持时钟展宽、仲裁和同步，确保总线操作的准确性。 4. 热插拔兼容性：TCA9511A允许在有电的I2C总线上安全地插入或拔出IO卡，避免总线冲突，保护了设备免受潜在的电气冲击。 5. 节能设计：当I2C总线空闲时，通过低电平的EN引脚可以进入关断模式，显著降低功耗。当需要时，只需将EN引脚拉高，即可恢复正常工作。 6. 接口管理：带有开漏输出的READY引脚在总线连接状态改变时提供清晰的指示，当两端连接时，SDA和SCL信号会被正确路由；断开时，READY变为低电平。 7. 封装选项：TCA9511A采用VSSOP-8封装，尺寸为3.00mm×3.00mm，同时也提供其他封装选择，具体可参考数据表末尾的可订购产品附录。 8. 文档与支持：文档提供了简化版原理图以及修订历史，但用户应参考TI官方网站www.ti.com获取最新的官方英文数据 sheet SCPS272，因为英文版本始终是最准确和全面的资源。 TCA9511A凭借其独特的功能和保护机制，成为在工业级I2C应用中实现热插拔和高效数据传输的理想选择，确保了系统的可靠性和稳定性。在实际设计时，务必结合最新的产品规格和文档进行详细评估。

6.5 Electrical Characteristics

Over operating free-air temperature range (unless otherwise noted). Typical specifications are at T

= 25 °C, V

= 3.3 V,

unless otherwise noted.

PARAMETER

TEST CONDITIONS MIN TYP MAX UNIT

POWER SUPPLY

Supply current

VCC = 5.5V

SDAIN, SCLIN = 0V

SDAOUT, SCLOUT = 10k R

2.5 4.5 mA

Supply current in shutdown mode through

the V

(1)

EN = 0 V

SDAIN, SCLIN, SDAOUT, SCLOUT = 0V

or V

READY pin = Hi-Z

EN pulled low after bus connection event

(disable precharge)

5 30 µA

UVLO

Under voltage lockout (rising)

EN = V

READY = 10 kΩ to V

2.1 V

Under voltage lockout (falling) 2 V

START-UP CIRCUITRY

PRE

Pre-charge voltage SDA, SCL = Hi-Z 0.8 1 1.2 V

RISE-TIME ACCELERATORS

RTA pull-up current

(2)

Position transition on SDA, SCL

SDA/SCL

= 0.6 V, Slew rate = 1.25 V/µs.

VCC = 3.3 V

2 5 mA

INPUT-OUTPUT CONNECTION

Input pin leakage

SDA/SCL pins = 90% V

, EN = V

GND

SDA/SCL pins = 10% V

, EN = GND

-1 1 µA

Input-output offset voltage (SCLIN to

SCLOUT, SCLOUT to SCLIN and SDAIN

to SDAOUT, SDAOUT to SDAIN

for SDA/SCL = 10 kΩ

60 100 mV

I_RDY

Ready pin leakage

EN = VCC, READY = V

, Bus

connected

-1 1 µA

DIGITAL IO THRESHOLD

High-level input voltage EN

0.7 ×

Low-level input voltage EN 0

0.3 ×

Low-level output voltage

SDAIN, SCLIN, SDAOUT, SCLOUT

= 4 mA

= 0.1 V

0.15 0.4

READY

= 3 mA

0 0.4

DYNAMIC CHARACTERISTICS

IN (EN)

EN input capacitance

= 0 V or V

f = 400 kHz

1.6 4

(READY)

READY output capacitance

READY

= 0 V or V

f = 400 kHz

7 10

IO (SDA/

SCL)

SDA/SCL pin capacitance

= 0 V or V

f = 400 kHz

5 10

(1) In shutdown mode there will also be current flowing from V

through the ready pin as this pin is pulled down to indicate the bus is

disconnected.

(2) Determined by design, not tested in production.

6.6 Timing Requirements

MIN NOM MAX UNIT

SCL_MAX

Maximum SCL clock frequency 400 kHz

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TCA9511A

ZHCSKD1C – OCTOBER 2019 – REVISED JANUARY 2021

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Product Folder Links: TCA9511A

6.6 Timing Requirements (continued)

MIN NOM MAX UNIT

BUF

(1)

Bus free time between a STOP and START condition 1.3 µs

HD;STA

(1)

Hold time for a repeated START condition 0.6 µs

SU;STA

(1)

Set-up time for a repeated START condition 0.6 µs

SU;STO

(1)

Set-up time for a STOP condition 0.6 µs

HD;DAT

(1)

Data hold time 0 ns

SU;DAT

(1)

Data set-up time 100 ns

LOW

(1)

LOW period of the SCL clock 1.3 µs

HIGH

(1)

HIGH period of the SCL clock 0.6 µs

(1)

Fall time of both SDA and SCL signals

20 ×

/5.5

300 ns

(1)

Rise time of both SDA and SCL signals

20 ×

/5.5

300 ns

(1) These are system-level timing specs and are dependent upon bus capacitance and pull up resistor value. It is up to the system

designer to ensure they are met

6.7 Switching Characteristics

Over operating free-air temperature range (unless otherwise noted). Typical specifications are at T

= 25 °C, V

= 3.3 V,

unless otherwise noted.

PARAMETER

TEST CONDITIONS MIN TYP MAX UNIT

START-UP CIRCUITRY

PRECHAR

Time from V

to precharge enabled

SDA,SCL = Hi-Z

EN = V

, GND

15 60 µs

Time from V

POR

to digital being ready

VCC transition from 0V to V

Time from V

PORR

to earliest stop bit

recongized

35 95 µs

IDLE

Bus idle time to READY active

SDA,SCL = 10 kΩ to V

EN = V

Measured at 0.5 × V

95 150 µs

DISABLE

Time from EN high to low to READY low

SDA,SCL = 10 kΩ to V

READY = 10 kΩ to V

Measured at 0.5 × V

30 200 ns

STOP

SDAIN to READY delay after stop

condition

SDA,SCL = 10 kΩ to V

READY = 10 kΩ to V

Measured at 0.5 × V

1.2 2 µs

READY

SCLOUT/SDAOUT to READY

SDA,SCL = 10 kΩ to V

READY = 10 kΩ to V

Measured at 0.5 × V

0.8 1.5 µs

INPUT-OUTPUT CONNECTION

PLZ

Low to high propagation delay

for SDA/SCL = 10 kΩ

= 100 pF per pin

Measured at 0.5 × VCC

0 10 ns

PZL

High to low propagation delay

for SDA/SCL = 10 kΩ

= 100 pF per pin

Measured at 0.5 × VCC

70 150 ns

TCA9511A

ZHCSKD1C – OCTOBER 2019 – REVISED JANUARY 2021

www.ti.com.cn

Submit Document Feedback

Product Folder Links: TCA9511A

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