D8254C-2 Memory 5V 10mA IC PDIP-24
The D8254C-2 or 82C54 is a high-performance CMOS Programmable Interval Timer containing three independent 16-bit counters. It is designed to provide accurate timing and counting functions under software control, offloading timing tasks from the main microprocessor. Each counter can be programmed to operate in one of six different modes, making it suitable for a wide range of applications including real-time clocks, digital one-shots, frequency generators, and event counters. The device is functionally compatible with the industry-standard NMOS 8254 and is optimized for low-power operation with a single 5V supply, making it ideal for embedded systems and computer peripherals.
Features:
- Three completely independent 16-bit counters.
- Six programmable operating modes for versatile timing functions.
- Compatible with a wide range of microprocessors.
- Status Read-Back command allows reading count, mode, and output state.
- Operates in either binary or BCD counting modes.
- Low power consumption typical of CMOS technology.
- Single 5V power supply operation.
Specifications:
| Parameter | Specification |
|---|---|
| Clock Input Frequency: | Up to 8MHz (82C54), 10MHz (82C54-10), 12MHz (82C54-12) |
| Supply Voltage (Vcc): | 5V ±10% (4.5V to 5.5V) |
| Operating Current (Iccop): | 10 mA (max) at 8MHz |
| Standby Current (Iccsb): | 10 µA (max) |
| Operating Temperature: | 0°C to +70°C (Commercial), -40°C to +85°C (Industrial), -55°C to +125°C (Military) |
| Logic Compatibility: | TTL |
| Package Types: | 24-Pin PDIP |
Pinout:
| Pin | Symbol | Type | Description |
|---|---|---|---|
| 1 | D7 | I/O | Data Bus Bit 7 |
| 2 | D6 | I/O | Data Bus Bit 6 |
| 3 | D5 | I/O | Data Bus Bit 5 |
| 4 | D4 | I/O | Data Bus Bit 4 |
| 5 | D3 | I/O | Data Bus Bit 3 |
| 6 | D2 | I/O | Data Bus Bit 2 |
| 7 | D1 | I/O | Data Bus Bit 1 |
| 8 | D0 | I/O | Data Bus Bit 0 |
| 9 | CLK 0 | I | Clock Input for Counter 0 |
| 10 | OUT 0 | O | Output of Counter 0 |
| 11 | GATE 0 | I | Gate Control Input for Counter 0 |
| 12 | GND | PWR | Ground |
| 13 | OUT 1 | O | Output of Counter 1 |
| 14 | GATE 1 | I | Gate Control Input for Counter 1 |
| 15 | CLK 1 | I | Clock Input for Counter 1 |
| 16 | GATE 2 | I | Gate Control Input for Counter 2 |
| 17 | OUT 2 | O | Output of Counter 2 |
| 18 | CLK 2 | I | Clock Input for Counter 2 |
| 19 | A0 | I | Address Input 0 (Selects Counter/Register) |
| 20 | A1 | I | Address Input 1 (Selects Counter/Register) |
| 21 | CS | I | Chip Select (Active Low) |
| 22 | RD | I | Read Input (Active Low) |
| 23 | WR | I | Write Input (Active Low) |
| 24 | Vcc | PWR | +5V Supply |
Applications:
- Real-time clock generation.
- Event counting and frequency measurement.
- Programmable rate and waveform generation (square waves, pulses).
- Complex motor control timing.
- Hardware timing for data acquisition systems.
- Replacement for NMOS 8253/8254 timers in upgraded designs.
Packages:
- 1x D8254C-2 Memory 5V 10mA IC PDIP-24.
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