Rad-Hard 16-bit transceiver, 3.3 to 5 V bidirectional level shifter transceiver

The 54AC164245 is a rad-hard advanced high-speed CMOS, Schmitt trigger, 16-bit, bidirectional, multi-purpose transceiver with 3-state outputs and cold sparing.

Designed for use as an interface between a 5 V bus and a 3.3 V bus in mixed 5 V/3.3 V supply systems, it achieves high-speed operation while maintaining the CMOS low-power dissipation.

All pins have cold spare buffers to change them to high impedance when VDD is tied to ground.

This IC is intended for two-way asynchronous communication between the data buses. The direction of the data transmission is determined by the nDIR inputs.

The A port interfaces with the 3.3 V bus but can also operate at 2.3 V. The B port operates with the 5 V bus.

Key Features

  • Fully compatible with 54ACS164245
  • Dual supply bidirectional level shifter
  • Extended voltage range from 2.3 V to 5.5 V
  • Separated enable pin for 3-state output
  • Schmidt-triggered I/Os: 100 mV hysteresis
  • Internal 26 Ω limiting resistor on each I/O
  • High speed: Tpd = 8 ns maximum
  • Fail safe
  • Cold spare
  • Hermetic package
  • 100 krad (Si) at any Mil1019 dose rate
  • SEL immune to 110 MeV.cm2 /mg LET ions
  • RHA QML-V qualified



Description Version Size
DS6995 DS6995: Rad-hard 16-bit transceiver 3.3 V to 5 V bidirectional level shifter 8.0 589 KB
DB0998 DB0998: Rad-hard advanced high-speed 5 V CMOS logic series 6.0 897 KB
Technical Notes & Articles
Description Version Size
TN0999 TN0999: 54AC164245 radiation report 2.2 1 MB
TN1190 TN1190: Additional 100 krad specification for M54HCxx and M54HCTxx series products 2.3 182 KB
TN1181 TN1181: Engineering Model quality level 2.1 371 KB

HW Model, CAD Libraries & SVD

HW Model, CAD Libraries & SVD
Description Version Size
54AC164245 beginning of life IBIS model (.ibs) 2.0 107 KB


Description Version Size
Aerospace and Hi-rel - ESCC, JANS & QML products 1.0 2 MB


型号 Marketing Status SMD PIN/Detailed Spec Quality Level EPPL Other (comments) Hi-Rel Package Lead Finish Packing Type Package: Product Marking Mass (gr) ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
RHRAC164245K01V Active 5962R9858008VYC QML-V Flight - 100 krad Flat-48 Gold Carrier Tape 5962R9858008VYC 1.5 NEC EAR99 FRANCE MORE INFO No availability reported, please contact our Sales office
RHFAC164245K1 NRND - Engineering Model - - Flat-48 Gold Carrier Tape RHFAC164245K1 1.5 NEC EAR99 - MORE INFO DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors


型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
RHRAC164245K1 ActiveFLAT CER MILIndustrialN/A
RHRAC164245K01V ActiveFLAT48 FPIndustrialN/A
RHFAC164245K1 NRNDFLAT48 EMIndustrialN/A

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.