SN74CB3T3125

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3.3-V, 1:1 (SPST), 4-channel FET bus switch with level shifter

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Data sheet

document-pdfAcrobat SN74CB3T3125 Quadruple FET Bus Switch 2.5-V, 3.3-V Low-Voltage Bus Switch with 5-V-Tolerant Level Shifter datasheet (Rev. C) PDF | HTML

SN74CB3T3125

ACTIVE

Data sheet

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Product details

Protocols

Analog

Configuration

1:1 SPST

Number of channels

4

Bandwidth (MHz)

100

Ron (typ) (mΩ)

5000

Input/output voltage (min) (V)

0

Input/output voltage (max) (V)

5.5

Operating temperature range (°C)

-40 to 85

ESD CDM (kV)

1

Input/output continuous current (max) (mA)

128

COFF (typ) (pF)

4.5

CON (typ) (pF)

4

OFF-state leakage current (max) (µA)

10

Ron (max) (mΩ)

8000

VIH (min) (V)

1.7

VIL (max) (V)

0.8

Rating

Catalog

Protocols

Analog

Configuration

1:1 SPST

Number of channels

4

Bandwidth (MHz)

100

Ron (typ) (mΩ)

5000

Input/output voltage (min) (V)

0

Input/output voltage (max) (V)

5.5

Operating temperature range (°C)

-40 to 85

ESD CDM (kV)

1

Input/output continuous current (max) (mA)

128

COFF (typ) (pF)

4.5

CON (typ) (pF)

4

OFF-state leakage current (max) (µA)

10

Ron (max) (mΩ)

8000

VIH (min) (V)

1.7

VIL (max) (V)

0.8

Rating

Catalog

VQFN (RGY)

14

12.25 mm² (3.5 mm × 3.5 mm)

TSSOP (PW)

14

32 mm² (5 mm × 6.4 mm)

TVSOP (DGV)

14

23.04 mm² (3.6 mm × 6.4 mm)

Output Voltage Translation Tracks V_CC
Supports Mixed-Mode Signal Operation On All Data I/O Ports
- 5-V Input Down to 3.3-V Output-Level Shift With 3.3-V V_CC
- 5-V/3.3-V Input Down to 2.5-V Output-Level Shift With 2.5-V V_CC
5-V-Tolerant I/Os With Device Powered Up or Powered Down
Bidirectional Data Flow, With Near-Zero Propagation Delay
Low ON-State Resistance (r_on) Characteristics
(r_on= 5 Ω Typical)
Low Input/Output Capacitance Minimizes Loading
(C_io(OFF) = 4.5 pF Typical)
Data and Control Inputs Provide Undershoot Clamp Diodes
Low Power Consumption (I_CC = 20 µA Max)
V_CC Operating Range From 2.3 V to 3.6 V
Data I/Os Support 0- to 5-V Signaling Levels (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V)
Control Inputs Can Be Driven by TTL or 5-V/3.3-V CMOS Outputs
I_off Supports Partial-Power-Down Mode Operation
Latch-Up Performance Exceeds 250 mA Per JESD 17
ESD Performance Tested Per JESD 22
- 2000-V Human-Body Model
  (A114-B, Class II)
- 1000-V Charged-Device Model (C101)

Output Voltage Translation Tracks V_CC
Supports Mixed-Mode Signal Operation On All Data I/O Ports
- 5-V Input Down to 3.3-V Output-Level Shift With 3.3-V V_CC
- 5-V/3.3-V Input Down to 2.5-V Output-Level Shift With 2.5-V V_CC
5-V-Tolerant I/Os With Device Powered Up or Powered Down
Bidirectional Data Flow, With Near-Zero Propagation Delay
Low ON-State Resistance (r_on) Characteristics
(r_on= 5 Ω Typical)
Low Input/Output Capacitance Minimizes Loading
(C_io(OFF) = 4.5 pF Typical)
Data and Control Inputs Provide Undershoot Clamp Diodes
Low Power Consumption (I_CC = 20 µA Max)
V_CC Operating Range From 2.3 V to 3.6 V
Data I/Os Support 0- to 5-V Signaling Levels (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V)
Control Inputs Can Be Driven by TTL or 5-V/3.3-V CMOS Outputs
I_off Supports Partial-Power-Down Mode Operation
Latch-Up Performance Exceeds 250 mA Per JESD 17
ESD Performance Tested Per JESD 22
- 2000-V Human-Body Model
  (A114-B, Class II)
- 1000-V Charged-Device Model (C101)

The SN74CB3T3125 is a high-speed TTL-compatible FET bus switch with low ON-state resistance (r_on), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks V_CC. The SN74CB3T3125 supports systems using 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Typical DC Voltage-Translation Characteristics).

The SN74CB3T3125 is organized as four 1-bit bus switches with separate output-enable (1OE, 2OE, 3OE, 4OE) inputs. It can be used as four 1-bit bus switches or as one 4-bit bus switch. When OE is low, the associated 1-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated 1-bit bus switch is OFF, and the high-impedance state exists between the A and B ports.

This device is fully specified for partial-power-down applications using I_off. The I_off feature ensures that damaging current will not backflow through the device when it is powered down. The device has isolation during power off.

To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN74CB3T3125 is a high-speed TTL-compatible FET bus switch with low ON-state resistance (r_on), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks V_CC. The SN74CB3T3125 supports systems using 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Typical DC Voltage-Translation Characteristics).

The SN74CB3T3125 is organized as four 1-bit bus switches with separate output-enable (1OE, 2OE, 3OE, 4OE) inputs. It can be used as four 1-bit bus switches or as one 4-bit bus switch. When OE is low, the associated 1-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated 1-bit bus switch is OFF, and the high-impedance state exists between the A and B ports.

This device is fully specified for partial-power-down applications using I_off. The I_off feature ensures that damaging current will not backflow through the device when it is powered down. The device has isolation during power off.

To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

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Top documentation	Type	Title	Format options	Date
*	Data sheet	SN74CB3T3125 Quadruple FET Bus Switch 2.5-V, 3.3-V Low-Voltage Bus Switch with 5-V-Tolerant Level Shifter datasheet (Rev. C)	PDF \| HTML	Dec 20, 2018
	Application note	Selecting the Correct Texas Instruments Signal Switch (Rev. E)	PDF \| HTML	Jun 2, 2022
	Application note	Multiplexers and Signal Switches Glossary (Rev. B)	PDF \| HTML	Dec 1, 2021
	Application brief	Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C)	PDF \| HTML	Jan 6, 2021

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Interface adapter

LEADED-ADAPTER1 — Surface mount to DIP header adapter for quick testing of TI's 5, 8, 10, 16 & 24-pin leaded packages

The EVM-LEADED1 board allows for quick testing and bread boarding of TI's common leaded packages. The board has footprints to convert TI's D, DBQ, DCT,DCU, DDF, DGS, DGV, and PW surface mount packages to 100mil DIP headers.

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