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SN74LVC4245APWR

Octal 3.3V-5V bidirectional level shifter, TSSOP-24

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Manufacturer Part：

SN74LVC4245APWR

Package：

TSSOP-24 (7.8 x 4.4 x 1.1 mm)

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Description

Product Overview

The SN74LVC4245APWR from Texas Instruments is an octal bidirectional level-shifting bus transceiver in a 24-pin TSSOP package. It translates between 3.3V (B port) and 5V (A port) logic levels with 3-state outputs, direction control, and output enable, designed for asynchronous communication between mixed-voltage data buses.

Key Specifications

Function Octal bus transceiver and level shifter
Channels 8 (bidirectional)
VCCA (A Port) 4.5V to 5.5V
VCCB (B Port) 2.7V to 3.6V
Translation 3.3V to 5V and 5V to 3.3V
Direction Control DIR pin (A-to-B or B-to-A)
Output Enable OE pin (active low, 3-state)
Control Voltage Ref VCCA (DIR and OE referenced to A-side)
Output Type 3-state
Propagation Delay ~4ns typ
Latch-Up >250mA per JESD 17
ESD 2000V HBM, 200V MM, 1000V CDM
Operating Temperature -40 to +85 C
Package TSSOP-24 (7.8 x 4.4 mm)
Status Active

Features

  • Octal bidirectional level-shifting transceiver
  • 3.3V to 5V / 5V to 3.3V voltage translation
  • Direction control via DIR pin
  • 3-state output enable via OE pin
  • Pin-compatible with standard 245 transceiver layout
  • Control inputs referenced to VCCA
  • >250mA latch-up immunity
  • High ESD protection (2kV HBM)

Applications

  • 5V to 3.3V logic level translation
  • Microcontroller to 5V peripheral interface
  • Mixed-voltage bus communication
  • PCI/ISA bus bridging

The SN74LVC4245APWR from Texas Instruments is an octal bidirectional level-shifting bus transceiver in a 24-pin TSSOP package. The PW denotes TSSOP-24, R denotes tape and reel (2000 pcs/reel). The device provides 8-bit bidirectional voltage translation between a 5V A port (VCCA = 4.5-5.5V) and a 3.3V B port (VCCB = 2.7-3.6V). The DIR pin selects the data direction: high for A-to-B, low for B-to-A. The active-low OE pin disables both ports to a high-impedance 3-state, effectively isolating the buses. Control inputs (DIR, OE) are referenced to VCCA, so they are 5V logic level. The pinout is designed to align with standard 245-type transceiver layouts (pins 2-11 and 14-23 carry data), allowing a designer to switch between an all-3.3V or all-5V standard 245 device and the SN74LVC4245A without board re-layout. The dual-supply architecture enables true level translation: the A port outputs swing to VCCA (5V) and the B port outputs swing to VCCB (3.3V).

The SN74LVC4245APWR operates through three subsystems: (1) Dual-Supply Architecture: The A port I/O buffers are powered by VCCA (4.5-5.5V), and the B port I/O buffers are powered by VCCB (2.7-3.6V). This ensures that output voltages on each side are appropriate for the connected logic domain. When an A-port output drives high, it drives to VCCA (5V); when a B-port output drives high, it drives to VCCB (3.3V). (2) Direction Control: The DIR pin (referenced to VCCA) determines data flow direction. When DIR is high, data flows from A1-A8 to B1-B8 (5V to 3.3V translation). When DIR is low, data flows from B1-B8 to A1-A8 (3.3V to 5V translation). The direction applies to all 8 channels simultaneously. (3) Output Enable: The active-low OE pin (referenced to VCCA) controls the 3-state outputs. When OE is high, both A and B port outputs are in high-impedance state, isolating the two buses. When OE is low, the selected direction is active. Both ports can never drive simultaneously in opposite directions, preventing bus contention.

Pin Name Type Description
1 DIR Input Direction control (H=A-to-B, L=B-to-A)
2-9 A1-A8 I/O A port data (5V domain)
10 GND Power Ground
11 OE Input Output enable (active low)
12-19 B1-B8 I/O B port data (3.3V domain)
20 GND Power Ground
21 VCCB Power B port supply (2.7-3.6V)
22-24 NC – No connect
– VCCA Power A port supply (4.5-5.5V), pin 23 or power pin
  • 5V microcontroller to 3.3V peripheral bus level translation with DIR controlled by MCU GPIO for bidirectional data transfer
  • 3.3V FPGA communicating with 5V legacy ISA/PCI bus using 8-bit bidirectional level shifting with OE for bus isolation
  • Mixed-voltage data acquisition system with 5V ADC and 3.3V processor sharing an 8-bit parallel bus through the transceiver
  • Industrial control module bridging 3.3V logic to 5V industrial I/O with latch-up immunity above 250mA
Model Manufacturer Translation Package Notes
SN74LVC4245ADWR TI 3.3V/5V SOIC-24 Wider SOIC package
SN74LVC16245ADGVR TI 3.3V/5V TSSOP-48 16-bit version
74LVC4245PW NXP 3.3V/5V TSSOP-24 Pin-compatible
FXMA108BQX onsemi/Fairchild Adjustable QFN-20 Auto-direction sensing
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