Features
• QML Qualified Per MIL-PRF-38535 Requirements
• 1.25Micron Radiation Hardened SOS CMOS
• Radiation Environment
- Latch-up Free Under any Conditions
- Total Dose . . . . . . . . . . . . . . . . . . . . . 3 x 105 RAD(Si)
- SEU Immunity . . . . . . . . . . .<1 x 10-10 Errors/Bit/Day
- SEU LET Threshold. . . . . . . . . . . >100MeV/(mg/cm2)
• Input Logic Levels . . . VIL = (0.3V)(VCC), VIH = (0.7V)(VCC)
• Output Current 12mA
• Quiescent Supply Current . . . . . . . . . . . . . . . . . . . 20A
• Propagation Delay . . . . . . . . . . . . . . . . . . . . . . . . . .15ns

Description
The Radiation Hardened ACS138MS is an Inverting 3-to-8
Line Decoder/Demultiplexer with three binary select inputs
(A0, A1 and A2). If the device is enabled, these inputs determine which one of the eight normally high outputs will go
low.
Two active low and one active high enable inputs (E1, E2
and E3) are provided to make cascaded decoder designs
easier to implement.
The ACS138MS is fabricated on a CMOS Silicon on Sapphire (SOS) process, which provides an immunity to Single
Event Latch-up and the capability of highly reliable performance in any radiation environment. These devices offer
significant power reduction and faster performance when
compared to ALSTTL types.
Specifications for Rad Hard QML devices are controlled
by the Defense Supply Center in Columbus (DSCC). The
SMD numbers listed below must be used when ordering.
Detailed Electrical Specifications for the ACS138 are
contained in SMD 5962-98534.