PCA9548ADBR

Part: PCA9548APW,118 (PCA9548A, TSSOP-24 package) — Texas Instruments

Type: 8-Channel I²C Bus Switch with Reset

Description: Low-voltage 1-of-8 bidirectional translating I²C/SMBus switch with active-low reset, 2.3–5.5 V supply, 5 V tolerant I/O, and 0–400 kHz operation.

Operating Conditions:

• Supply voltage: 2.3–5.5 V
• Operating temperature: -40 to 85 °C
• Clock frequency: 0 to 400 kHz
• Input high voltage (SCL, SDA): 0.7 × VCC to 6 V

Absolute Maximum Ratings:

• Max supply voltage: 7 V (min -0.5 V)
• Input voltage: -0.5 to 7 V
• Input current: ±20 mA
• Output current: ±25 mA
• Supply current: ±100 mA
• Storage temperature: -65 to 150 °C

Key Specs:

• Supply voltage (VCC): 2.3–5.5 V
• VIH (SCL, SDA): 0.7 × VCC min, 6 V max
• VIL (SCL, SDA): -0.5 V min, 0.3 × VCC max
• Operating free-air temperature: -40 to 85 °C
• I²C clock frequency: 0–400 kHz
• Latch-up performance exceeds 100 mA per JESD 78, Class II
• ESD: 2000 V HBM, 200 V MM, 1000 V CDM

Features:

• 1-of-8 bidirectional translating switches
• I²C bus and SMBus compatible
• Active-low reset input
• Three hardware address pins allow up to eight devices on the same I²C bus
• Channel selection via I²C bus
• Power-up with all channels deselected
• Low RON switches
• Voltage-level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
• No glitch on power-up
• Supports hot insertion
• Low standby current
• 5 V tolerant inputs

Applications:

• Servers
• Routers (telecom switching equipment)
• Factory automation
• Products with I²C slave address conflicts (e.g., multiple identical temperature sensors)

Package:

• SSOP (24): 8.20 mm × 5.30 mm
• TVSOP (24): 5.00 mm × 4.40 mm
• SOIC (24): 15.40 mm × 7.50 mm
• TSSOP (24): 7.80 mm × 4.40 mm
• VQFN (24): 4.00 mm × 4.00 mm

• 1-of-8 Bidirectional Translating Switches
• I 2 C Bus and SMBus Compatible
• Active-Low Reset Input
• Three Hardware Address Pins for Use of up to Eight PCA9548A Devices on the I 2 C Bus
• Channel Selection Via I 2 C Bus
• Power-Up with All Switch Channels Deselected
• Low RON Switches
• Allows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V Buses
• No Glitch on Power Up
• Supports Hot Insertion
• Low Standby Current
• Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
• 5-V Tolerant Inputs
• 0-kHz to 400-kHz Clock Frequency
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22
• -2000-V Human-Body Model (A114-A)
• -200-V Machine Model (A115-A)
• -1000-V Charged-Device Model (C101)

• Servers
• Routers (Telecom Switching Equipment)
• Factory Automation
• Products With I 2 C Slave Address Conflicts (For Example, Multiple, Identical Temp Sensors)

Figure 5-1. DB, DGV, DW or PW Package, 24-Pin SSOP, TVSOP, SOIC or TSSOP , Top View

Table 5-1. Pin Functions

Table 5-1. Pin Functions

Figure 5-2. RGE Package, 24-Pin VQFN , Top View

Table 5-2. Pin Functions, RGE

Table 5-2. Pin Functions, RGE

VCC = 2.3 V to 3.6 V, over recommended operating free-air temperature range (unless otherwise noted)

• PARAMETER PARAMETER PARAMETER TEST CONDITIONS V CC MIN TYP (1) MAX UNIT
• V PORR Power-on reset voltage, V CC rising No load, V I = V CC or GND 1.2 1.5 V
• V PORF Power-on reset voltage, V CC falling (2) No load, V I = V CC or GND 0.8 1 V
• V 5 V 3.6
• 4.5 V to 5.5 V 2.6 4.5
• 3.3 V 1.9
• o(sw) voltage V i(sw) = V CC , I SWout = -100 μA 3 V to 3.6 V 1.6 2.8 V
• 2.5 V 1.5
• 2.3 V to 2.7 V 1.1 2
• I OL V OL = 0.4 V 2.3 V to 5.5 V 3 6 mA
• SDA V OL = 0.6 V 6 9
• SCL, SDA SCL, SDA -1 1
• SC7-SC0, SD7-SD0 SC7-SC0, SD7-SD0 -1 1
• I I A2-A0 A2-A0 V I = V CC or GND 2.3 V to 5.5 V -1 1 μA
• RESET RESET -1 1
• 5.5 V 50 80
• f SCL = 400 kHz V I = V CC or GND, I O = 0 3.6 V 20 35
• 2.7 V 11 20
• 5.5 V 9 30
• f SCL = 100 kHz V I = V CC or GND, I O = 0 3.6 V 6 15
• 2.7 V 4 8
• I CC 5.5 V 0.2 2 μA
• Low inputs V I = GND, I O = 0 3.6 V 0.1 2
• 2.7 V 0.1 1
• 5.5 V 0.2 2
• High inputs V I = V CC , I O = 0 3.6 V 0.1 2
• 2.7 V 0.1 1
• SCL or SDA input at 0.6 V, 3
• ΔI CC SCL, SDA Other inputs at V CC or GND SCL or SDA input at V CC - 0.6 V, 2.3 V to 5.5 V 20 μA
• Other inputs at V CC or GND 3 20
• 4 5
• C A2-A0 A2-A0 V I = V CC or GND 2.3 V to 5.5 V 4 5 pF
• i 20 28
• V = I V CC or GND, Switch OFF
• C (3) SDA SDA V I = V CC or GND, Switch OFF 2.3 V to 5.5 V 20 28 pF
• io(off) SD7-SD0 4.5 V to 5.5 V 5.5 7.5 20
• R ON Switch-on resistance V O = 0.4 V, I O = 15 mA 4 10 Ω
• V O = 0.4 V, I O = 10 mA 3 V to 3.6 V 2.3 V to 2.7 V 5 7 12 15 30 45

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

See (1)

Applications of the PCA9548A contain an I 2 C (or SMBus) master device and up to eight I 2 C slave devices. The downstream channels are ideally used to resolve I 2 C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0, 1, 2, and 3. When the temperature at a specific location needs to be read, the appropriate channel can be enabled and all other channels switched off, the data can be retrieved, and the I 2 C master can move on and read the next channel.

In an application where the I 2 C bus contains many additional slave devices that do not result in I 2 C slave address conflicts, these slave devices can be connected to any desired channel to distribute the total bus capacitance across multiple channels. If multiple switches are enabled simultaneously, additional design requirements must be considered (See the Design Requirements and Detailed Design Procedure sections).