Methods and means of dynamic control of energy supply systems for implantable medical devices

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Key Points

Characterize the electrical limits, switching speeds, and operating performance of hex inverters used in dynamic power control circuitry for implantable medical systems.
Characterized SN54AHC04 and SN74AHC04 hex inverters across supply voltages from 2 V to 5.5 V and operating temperatures from -55°C to 125°C.
Evaluated propagation delays (tPLH and tPHL) under load capacitances of 15 pF and 50 pF at nominal supply voltages of 3.3 V ± 0.3 V and 5 V ± 0.5 V.
Devices supported an operating supply voltage range of 2 V to 5.5 V with latch-up performance exceeding 250 mA per JESD 17 and electrostatic discharge protection exceeding 2000-V Human-Body Model.
Propagation delay at VCC = 5 V ± 0.5 V and CL = 15 pF at 25°C reached a typical value of 3.8 ns and a maximum of 5.5 ns for both tPLH and tPHL.
Under high capacitive load (CL = 50 pF) at VCC = 3.3 V ± 0.3 V across -40°C to 125°C, maximum propagation delay was 13 ns.

No clinical data provided; leaves open any translation of electrical specs to cardiovascular device applications.

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Selyutina et al. (2026) studied this question.

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