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TCA9548A

I2C Switch

The TCA9548A is a i2c switch from Texas Instruments. View the full TCA9548A datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official TCA9548A datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

Category

Interface ICs

TCA9548A Key Specifications

ParameterValue
ESD (CDM)±1000V
ESD (HBM)±2000V
InterfaceI2C / SMBus
Address Pins3 (A0-A2), up to 8 devices per bus
Input Tolerance5V tolerant I/O
Available PackagesTSSOP-24, VQFN-24, VSSOP-24
Number Of Channels8 bidirectional translating switches
I2C Clock Frequency0 to 400kHz
Latch-Up Performanceexceeds 100mA per JESD 78, Class II
Supply Voltage Range1.65V to 5.5V
Operating Temperature Range-40°C to 85°C (VCC 3.6V to 5.5V); -40°C to 125°C (VCC 1.65V to 3.6V)
Power-On Reset Voltage (Rising)1.5V max

TCA9548A Overview

Part: TCA9548A from Texas Instruments

Type: 8-Channel I2C Switch with Reset

Description: The TCA9548A is an 8-channel bidirectional translating I2C switch with an active-low reset input, supporting voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses, and operating from 1.65V to 5.5V with up to 400kHz clock frequency.

Operating Conditions:

  • Supply voltage: 1.65 V to 5.5 V
  • Operating temperature: -40 to +125 °C (for 1.65 V ≤ VCC ≤ 3.6 V)
  • I2C clock frequency: 0 to 400 kHz

Absolute Maximum Ratings:

  • Max supply voltage: 7 V
  • Max output current: -25 mA
  • Max storage temperature: 150 °C
  • Max junction temperature: 130 °C (VCC ≤ 3.6 V), 90 °C (VCC ≤ 5.5 V)

Key Specs:

  • Switch-on resistance (RON): 10 Ω (Typ, VCC = 4.5 V to 5.5 V, IO = 15 mA)
  • Switch-on resistance (RON): 25 Ω (Typ, VCC = 1.65 V to 1.95 V, IO = 10 mA)
  • Output current (IOL): 6 mA (Min, VCC = 1.65 V to 5.5 V, VOL = 0.6 V)
  • Supply current (ICC) in operating mode: 30 μA (Max, VCC = 5.5 V, fSCL = 400 kHz)
  • Supply current (ICC) in standby mode: 2 μA (Max, VCC = 5.5 V, -40 °C ≤ TA ≤ 85 °C)
  • I2C bus capacitive load (Cb): 400 pF (Max)
  • I2C clock high time (tSCH): 0.6 μs (Min, Fast Mode)
  • I2C clock low time (tSCL): 1.3 μs (Min, Fast Mode)

Features:

  • 1-to-8 Bidirectional translating switches
  • I2C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A devices on the I2C bus
  • Channel selection through an I2C Bus, in any combination
  • Allows voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses
  • 5-V Tolerant inputs
  • 0 to 400kHz Clock frequency

Applications:

  • Servers
  • Routers (telecom switching equipment)
  • Factory Automation
  • Products with I2C target address conflicts (such as multiple, identical temperature sensors)

Package:

  • PW (TSSOP, 24)
  • RGE (VQFN, 24)
  • DGS (VSSOP, 24)

TCA9548A Features

  • 1-to-8 Bidirectional translating switches
  • I 2 C Bus and SMBus compatible
  • Active-low reset input
  • Three address pins, allowing up to eight TCA9548A devices on the I 2 C bus
  • Channel selection through an I 2 C Bus, in any combination
  • Power up with all switch channels deselected
  • Low RON switches
  • Allows voltage-level translation between 1.8V, 2.5V, 3.3V, and 5V buses
  • No glitch on power up
  • Supports hot insertion
  • Low standby current
  • Operating power-supply voltage range of 1.65V to 5.5V
  • 5-V Tolerant inputs
  • 0 to 400kHz Clock frequency
  • Latch-up performance exceeds 100mA Per JESD 78, class II
  • ESD Protection exceeds JESD 22
  • -±2000V Human-body model (A114-A)
  • -200V Machine model (A115-A)
  • -±1000V Charged-device model (C101)

TCA9548A Applications

  • Servers
  • Routers (telecom switching equipment)
  • Factory Automation
  • Products with I 2 C target address conflicts (such as multiple, identical temperature sensors)

TCA9548A

SCPS207H - MAY 2012 - REVISED SEPTEMBER 2024

TCA9548A Pin Configuration

Not to scale

Figure 4-1. PW, DGS Package, 24-Pin TSSOP, VSSOP (Top View)

Table 4-1. Pin Functions

PINPINPINTYPE
NAMETSSOP, VSSOP (PW, DGS)VQFN (RGE)TYPE
A0122I
A1223I
A22118I
GND129-
RESET324I
SD041I/O
SC052I/O
SD163I/O
SC174I/O
SD285I/O
SC296I/O
SD3107I/O
SC3118I/O
SD41310I/O
SC41411I/O
SD51512I/O
SC51613I/O
SD61714I/O
SC61815I/O
SD71916I/O
SC72017I/O
SCL2219I/O
SDA2320I/O
VCC2421Power

Table 4-1. Pin Functions

Figure 4-2. RGE Package, 24-Pin VQFN (Top View)

TCA9548A Electrical Characteristics

VCC = 1.65 V to 5.5 V, over recommended operating free-air temperature ranges supported by Recommended Operating Conditions (unless otherwise noted) (1)

PARAMETERTEST CONDITIONSV CCMINMAXUNIT
V PORRPower-on reset voltage, V CC risingNo load, V I = V CC or GND (3)1.5V
V PORFPower-on reset voltage, V CC falling (4)No load, V I = V CC or GND (3)5 V
4.5 V to 5.5 V
3.3 V		0.8
2.6		4.5V
V3 V to 3.6 V1.62.8V
o(sw)Switch output voltageV i(sw) = V CC , I SWout = -100 μA2.5 V
2.3 V to 2.7 V
1.8 V
1.65 V to 1.95 V		1.1
0.6		2
1.25
I OLV OL = 0.4 V3mA
SDAV OL = 0.6 V1.65 V to 5.5 V6
ISCL, SDASCL, SDA-11
SC7-SC0, SD7-SD0SC7-SC0, SD7-SD0-11
IA2-A0
RESET
f SCL
Operating mode		A2-A0
RESET
(3)
V I = V CC or GND , I O = 0
(3)		1.65 V to 5.5 V
5.5 V
3.6 V
2.7 V
1.65 V
5.5 V
3.6 V		-1
-1		1
1
80 35
20
10
30
15		μA
f SCLV I = V CC or GND , I O = 02.7 V
1.65 V
5.5 V		8
4
2		μA
I CCLow
Standby mode		V I = GND (3) , I O = 0, -40 °C ≤ TA ≤ 85 °C3.6 V 2.7 V
1.65
V
5.5 V
3.6 V		2 1
1
2
2
HighV I = V CC , I O = 0, -40 °C ≤ TA ≤ 85 °C2.7 V
1.65 V
3.6 V		1
1
2		μA
LowVi = Vcc or GND, Io = 0, 85 °C < TA ≤ 125 °C2.7 V
1.65 V		1.5
1		μA
μA
ΔI CCSupply-current
change SCL,		SCL or SDA input at 0.6 V, Other inputs at V CC or GND (3)
SCL or SDA input at V CC - 0.6 V, Other inputs at V CC or GND (3)		1.65 V to 5.5 V20
20		μA
A2-A0V I = V CC or GND (3)5 5pF
C iRESET SCLV I = V CC or GND (3) , Switch OFF1.65 V to 5.5 V28
C io(off) (5)SDA SC7-SC0, SD7-SD0V I = V CC or GND (3) , Switch OFF1.65 V to 5.5 V28 7.5pF

VCC = 1.65 V to 5.5 V, over recommended operating free-air temperature ranges supported by Recommended Operating Conditions (unless otherwise noted) (1)

PARAMETERPARAMETERTEST CONDITIONSV CCMINTYP (2)MAXUNIT
R ONSwitch-on resistanceV O = 0.4 V, I O = 15 mA4.5 V to 5.5 V41020Ω
R ONSwitch-on resistanceV O = 0.4 V, I O = 15 mA3 V to 3.6 V51230Ω
R ONSwitch-on resistanceV O = 0.4 V, I O = 10 mA2.3 V to 2.7 V71545Ω
R ONSwitch-on resistanceV O = 0.4 V, I O = 10 mA1.65 V to 1.95 V102570Ω
  • (1) For operation between specified voltage ranges, refer to the worst-case parameter in both applicable ranges
  • (2) All typical values are at nominal supply voltage (1.8-, 2.5-,3.3-, or 5-V V CC), T A = 25°C
  • (3) RESET = VCC (held high) when all other input voltages, VI = GND.
  • (4) The power-on reset circuit resets the I 2 C bus logic with V CC < VPORF
  • (5) Cio(ON) depends on internal capacitance and external capacitance added to the SCn lines when channels(s) are ON.

TCA9548A Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

MINMAXUNIT
V CCSupply voltageSupply voltage-0.57V
V IInput voltage (2)Input voltage (2)-0.57V
I IInput currentInput current-2020mA
I OOutput currentOutput current-25mA
I CCSupply currentSupply current-100100mA
T stgStorage temperatureStorage temperature-65150°C
T JV CC ≤ 3.6 V130°C
T JV CC ≤ 5.5 V90°C

TCA9548A Recommended Operating Conditions

MINMAXUNIT
V CCSupply voltage-40 °C ≤ T A ≤ 85 °C1.655.5V
V CC85 °C < T A ≤ 125 °C1.653.6V
V IHHigh-level input voltageSCL, SDA0.7 × V CC6V
V IHA2-A0, RESET0.7 × V CCV CC + 0.5V
V ILLow-level input voltageSCL, SDA-0.50.3 × V CCV
V ILA2-A0, RESET-0.50.3 × V CCV
T AOperating free-air temperature3.6 V < V CC ≤ 5.5 V-4085°C
T A1.65 V ≤ V CC ≤ 3.6 V-40125°C

TCA9548A Thermal Information

TCA9548ATCA9548ATCA9548A
THERMAL METRIC (1)THERMAL METRIC (1)PW (TSSOP)RGE (VQFN)DGS (VSSOP)
24 PINS24 PINS24 PINS
R θJAJunction-to-ambient thermal resistance108.857.286.1
R θJC(top)Junction-to-case (top) thermal resistance54.162.534.3
R θJBJunction-to-board thermal resistance62.734.447.3
ψ JTJunction-to-top characterization parameter10.93.81.5
ψ JBJunction-to-board characterization parameter62.334.447.0
R θJC(bot)Junction-to-case (bottom) thermal resistanceN/A15.5N/A

TCA9548A Typical Application

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