IS82C54Z96 - 8MHz CMOS Programmable Interval Timer | Renesas
MPN: IS82C54Z96 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.05 | $4,050.00 |
IS82C54Z96 Overview
A programmable interval timer (PIT) is a counter IC that generates precise time delays, event counting, and frequency-division functions under software control. As a category, the 82C54 sits within the broader timer/counter IC family, which in turn belongs to clock and timing semiconductors, bridging discrete counters, real-time clocks, and microcontroller peripherals. The IS82C54Z96 is the industrial temperature range variant, distinguished by the Z96 suffix indicating 28-PLCC packaging on tape-and-reel.
Key features of the IS82C54Z96 include six programmable counter modes (Mode 0 interrupt on terminal count, Mode 1 hardware retriggerable one-shot, Mode 2 rate generator, Mode 3 square wave generator, Mode 4 software-triggered strobe, and Mode 5 hardware-triggered strobe), three independent 16-bit down counters, read-back command for inspecting counter latches and status, and CMOS low-power operation. The 82C54 is the CMOS successor to the original Intel 8254/8253 NMOS parts, maintaining full software compatibility while delivering lower power consumption.
Typical applications include industrial control event counting, motor speed measurement via frequency division, baud-rate generation for legacy serial ports, programmable pulse generation for stepper motor drive signals, and embedded system timing in PC/104, VME, and CompactPCI single-board computers that still integrate the classic x86 peripheral set. The wide industrial operating temperature range of -40 C to +85 C and the robust CMOS process make it well suited for factory floor installations.
When designing with this part, ensure the read and write strobes (RD, WR) and the chip-select logic follow the standard 82C54/8254 control-word protocol. Each counter must be initialized with a control word before being loaded with a count, and back-to-back LSB/MSB reads of a 16-bit count are required to guarantee coherent data. The -Z96 suffix on the Renesas ordering code designates the industrial temperature grade and the tape-and-reel packaging option.
Drop-in alternatives for IS82C54Z96 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with IS82C54Z96 (same form factor and footprint) — differing in Counter Resolution, Operating Temperature Range, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
IS82C54Z
✅ Drop-In📋 Reference alternative (not in catalog)
IS82C54-10Z96
✅ Drop-In📋 Reference alternative (not in catalog)
IS82C54-12Z96
✅ Drop-In📋 Reference alternative (not in catalog)
CP82C54Z
✅ Drop-In📋 Reference alternative (not in catalog)
CS82C54Z96
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →IS82C54Z96 Specifications
| Product Type | Programmable Interval Timer |
| Number of Counters | 3 |
| Counter Resolution | 16-bit |
| Maximum Clock Frequency | 8 MHz |
| Supply Voltage | 4.5 V to 5.5 V |
| Counting Modes | 6 (Mode 0-5) |
| Count Format | Binary or BCD |
| Package | 28-pin PLCC (11.51 x 11.51 mm) |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Process Technology | 2 micron CMOS |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS Compliant |
| Lead Free Status | Lead Free |
| Pin Count | 28 |
IS82C54Z96 Pin Configuration
| Pin 1 | D7 — Data bus bit 7 |
| Pin 2 | D6 — Data bus bit 6 |
| Pin 3 | D5 — Data bus bit 5 |
| Pin 4 | D4 — Data bus bit 4 |
| Pin 5 | D3 — Data bus bit 3 |
| Pin 6 | D2 — Data bus bit 2 |
| Pin 7 | D1 — Data bus bit 1 |
| Pin 8 | D0 — Data bus bit 0 |
| Pin 9 | CLK2 — Counter 2 clock input |
| Pin 10 | OUT2 — Counter 2 output |
| Pin 11 | GATE2 — Counter 2 gate input |
| Pin 12 | VCC — Power supply, 5 V |
| Pin 13 | WR — Write strobe (active low) |
| Pin 14 | A1 — Address input bit 1 |
| Pin 15 | |
| Pin 15 | A0 — Address input bit 0 |
| Pin 16 | CS — Chip select (active low) |
| Pin 17 | RD — Read strobe (active low) |
| Pin 18 | GND — Ground |
| Pin 19 | OUT0 — Counter 0 output |
| Pin 20 | GATE0 — Counter 0 gate input |
| Pin 21 | CLK0 — Counter 0 clock input |
| Pin 22 | OUT1 — Counter 1 output |
| Pin 23 | GATE1 — Counter 1 gate input |
| Pin 24 | CLK1 — Counter 1 clock input |
| Pin 25 | GATE3 — Reserved / No Connect on 82C54 |
| Pin 26 | OUT3 — Reserved / No Connect on 82C54 |
| Pin 27 | CLK3 — Reserved / No Connect on 82C54 |
| Pin 28 | NC — Not connected (per datasheet) |
Typical Applications
IS82C54Z96 is suitable for 6 applications: Industrial Event Counting and Rate Measurement, Legacy PC/104 and VME Single-Board Computers, Baud-Rate Generation for Serial Communications, Programmable Pulse and PWM Generation, Embedded System Watchdog and Heartbeat, Test and Measurement Instrumentation.
Industrial Event Counting and Rate Measurement
The IS82C54Z96's three independent 16-bit counters and 8 MHz clock input make it ideal for industrial event counting and rate measurement on the factory floor. Each counter can be configured in Mode 2 rate-generator or Mode 3 square-wave-generator mode to count encoder pulses, measure conveyor-belt speed, or tally parts passing a photo-eye sensor without burdening the host PLC. According to the Renesas 82C54 datasheet, the read-back command allows the host to inspect counter latches and status, while the -40 C to +85 C industrial temperature range ensures operation in unheated enclosures. Compared to a microcontroller timer, the IS82C54Z96 offloads counting entirely from the CPU, freeing it for the SCADA communications loop.
Recommended
Legacy PC/104 and VME Single-Board Computers
The IS82C54Z96 is the canonical replacement for the original Intel 8254 timer on legacy PC/104, VME, and CompactPCI single-board computers that still integrate the classic x86 peripheral set. Its pin-for-pin compatibility with the NMOS 8254 means existing BIOS code, INT 08h ISR, and dynamic-RAM refresh logic continue to operate unchanged. The CMOS 2-micron implementation reduces the part's power consumption by roughly 80 percent compared to the original, which is critical for fanless industrial PCs. Designers migrating a long-lifecycle SBC design to a modern power budget can drop the IS82C54Z96 into the existing 28-pin PLCC footprint with no firmware changes.
Recommended
Baud-Rate Generation for Serial Communications
The IS82C54Z96 generates accurate baud-rate clocks for legacy UARTs, RS-232, RS-422, and RS-485 serial ports when a baud rate not directly available from the system clock is required. One counter can be programmed in Mode 3 to divide a 1.8432 MHz crystal down to any standard baud rate from 50 bps to 115200 bps, while the remaining two counters handle modem-control timing or flow-control watchdogs. The 8 MHz maximum clock input and 16-bit resolution support divider ratios up to 65536, covering every standard baud rate. According to the Renesas 82C54 datasheet, the CMOS design avoids the jitter and supply-noise coupling that plagued the original NMOS 8254.
Recommended
Programmable Pulse and PWM Generation
The IS82C54Z96 generates programmable pulses, one-shot delays, and variable-duty-cycle square waves for stepper motor drives, solenoid actuation, and process-control timing. Mode 1 hardware-retriggerable one-shot produces a single pulse of precise duration on a gate-signal trigger, while Mode 2 rate-generator produces a periodic pulse train for repetitive actuation. Three independent counters allow simultaneous control of a three-axis stepper system or coordinated timing of multiple solenoid valves. The IS82C54Z96's 8 MHz clock resolution gives a minimum pulse step of 125 ns, well below the millisecond-range response times typical of industrial actuators.
Recommended
Embedded System Watchdog and Heartbeat
The IS82C54Z96 implements a hardware watchdog timer independent of the host microcontroller, providing a last-resort reset signal if the firmware stops servicing the timer. One counter runs in Mode 0 interrupt-on-terminal-count, and the host must periodically reload it to prevent a system reset pulse on OUT0. Compared to a built-in MCU watchdog, the IS82C54Z96's independent clock domain protects against oscillator failure on the host and provides a tamper-resistant reset path for safety-critical applications. The industrial temperature range and CMOS low-power operation suit battery-backed or remote installations.
Recommended
Test and Measurement Instrumentation
The IS82C54Z96 is used in test and measurement instruments for precise timing of stimulus pulses, sample-and-hold gating, and frequency-division references. Its 16-bit resolution and 8 MHz maximum clock frequency produce timing references accurate to within 125 ns, suitable for bench-top instrumentation, data-acquisition systems, and laboratory counters. Three counters allow simultaneous timing of multiple test channels without CPU intervention, while the read-back command lets the host inspect count progress without disturbing the running measurement. The 28-PLCC package provides robust mechanical stability for repeated insertion and removal in test fixtures.
Recommended
Recommended Products Summary
Engineering reference data for IS82C54Z96 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IS82C54Z | IS82C54-10Z96 | IS82C54-12Z96 | CP82C54Z | 82C54Z96 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 28-PLCC (11.51x11.51) | 28-PLCC - same | 28-PLCC - same | 28-PLCC - same | 28-PLCC - same | 28-PLCC - same |
| Maximum Clock Frequency | 8 MHz | 8 MHz | 10 MHz | 12 MHz | 8 MHz | 8 MHz |
| Operating Temperature Range | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) |
| Packaging Form | Tape & Reel | Tray | Tape & Reel | Tape & Reel | Tray / Tube | Tape & Reel |
| Number of Counters | 3 | 3 | 3 | 3 | 3 | 3 |
| Counter Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
Key Differentiators
- Industrial temperature range with tape-and-reel packaging (vs CP82C54Z)
- Higher maximum clock frequency for faster counting (vs IS82C54-10Z96)
- Modern CMOS process versus legacy NMOS 8254 (vs Original Intel 8254 (NMOS))
Design Notes
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VCC pin (pin 12) of the IS82C54Z96, with a short, wide trace to the GND pin (pin 18). The CMOS counter draws sharp current pulses on internal state transitions that can corrupt the supply rail if not bypassed locally. For designs with multiple 82C54 parts or with shared 5 V rails powering digital and analog sections, add a 10 uF tantalum or aluminum polymer bulk capacitor near the IC to absorb low-frequency droop.
The IS82C54Z96 clock inputs (CLK0, CLK1, CLK2) require clean edges with rise and fall times under 30 ns for reliable counting at 8 MHz. Series-terminate long clock traces with 33 ohm resistors to dampen ringing, and avoid routing clock traces parallel to noisy data-bus lines. When using the device in Mode 2 or Mode 3 to generate baud-rate clocks, ensure the source crystal oscillator or clock generator has a jitter below 0.1% of the bit interval to meet RS-232/RS-485 timing margins.
A common design mistake is forgetting to issue a control-word write before loading a count into a counter; the IS82C54Z96 requires the control word (mode, BCD/binary, read/load LSB-MSB) to be programmed first or the count value is ignored. Another pitfall is reading a 16-bit counter as a single byte read; the LSB and MSB must be read with two successive bus cycles and the read-back command is needed if the counter is still running. Finally, do not leave GATE inputs floating - tie unused gate pins to VCC through a 10 kohm resistor to prevent spurious triggering.
The IS82C54Z96 in the 28-pin PLCC package has a junction-to-ambient thermal resistance of approximately 70 C/W, and CMOS power dissipation at 8 MHz is around 25 mW worst case. In a sealed enclosure without airflow, the junction temperature rises only 1.75 C above ambient, so thermal management is rarely an issue. However, in hot industrial cabinets exceeding +70 C ambient, ensure the IC remains below its +125 C absolute maximum junction temperature by adding airflow or derating clock frequency.
Compliance Information
RoHS compliant and Lead Free per DigiKey and Mouser product listings. Not AEC-Q100 qualified (this is a non-automotive legacy peripheral); industrial temperature grade only. Halogen-free status not explicitly stated in available data.
