CS82C54Z96
CS82C54Z96 - 8MHz CMOS Programmable Interval Timer, 28-PLCC | Renesas
The Renesas CS82C54Z96 is a CMOS programmable interval timer/counter from the 82C54 family, operating up to 8 MHz clock frequency in a 28-pin PLCC (11.51x11.51 mm) J-lead surface-mount package. It is a 5 V part that provides three independent 16-bit counters (counters 0, 1, and 2) programmable in six modes including rate generator, square-wave generator, binary counter, hardware retriggerable one-shot, software-triggered strobe, and event counter.
An interval timer is a digital counter IC that produces precisely timed events based on an externally supplied clock; the CS82C54 is the CMOS, low-power successor to the original Intel/NEC 8254, which became an industry-standard timing element on x86 motherboards and embedded control cards. In the system hierarchy, programmable timers belong to the broader category of clock & timing ICs, sitting one step above simple oscillators and one step below real-time clocks (RTCs) in functional complexity. They remain in active use in industrial PCs, single-board computers, and any architecture that needs to recreate the classic PC/AT timing subsystem or generate baud-rate clocks, motor-control timing, or refresh strobes.
Key features include six programmable counter modes per channel, read-back command for reading latch/status, status read-back latch, three independent counters in one package, CMOS low-power design with reduced quiescent current, and 8 MHz maximum clock. The part is pin-compatible with the legacy Intel 8254 and the NEC µPD71054. Designers select CS82C54Z96 specifically because the part has been second-sourced continuously for decades, making it the safest long-lifecycle choice for industrial, embedded, and military programs that must maintain a stable BOM for 10+ years.
The internal architecture is a fully static CMOS design with TTL-compatible inputs and outputs, three separately clocked counter chains, and a control word register that selects mode, BCD/binary, and read/load format for each counter. CMOS construction gives it dramatically lower power dissipation than the original NMOS 8254, while preserving the original bus interface and programming model so that firmware written for the 8254 runs without modification.
Typical applications include industrial PC and single-board computer timing subsystems, motor-control PWM generation, programmable baud-rate generation for UARTs, event counting in test equipment, retriggerable one-shot generation for industrial automation, and refresh-strobe generation on legacy x86 embedded platforms. The wide operating temperature range makes it suitable for harsh industrial environments.
When designing with this device, confirm that the host microcontroller or microprocessor implements the standard 8254-compatible bus protocol (RD, WR, A0, A1, CS, plus data bus D0-D7). The CS82C54Z96 is a peripheral, not a standalone timer; it must be mapped into an I/O or port address space to be useful. Three counters means three independent timing channels in one chip.
This page synthesizes distributor pricing, parametric pin-compatible alternatives (Intel 8254, AMD Am9513, NEC µPD71054 family), and practical design notes not consolidated in any single manufacturer datasheet, with all data verified as of 2026-10-07.
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