4MHz; V(cc): -0.5 to +7V; programmable interval times The UPD8253C-5 is a programmable interval timer (PIT) manufactured by NEC. Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Manufacturer:** NEC (Nippon Electric Company)
- **Part Number:** UPD8253C-5
- **Type:** Programmable Interval Timer (PIT)
- **Technology:** CMOS
- **Operating Voltage:** 5V
- **Speed Grade:** -5 (5 MHz operation)
- **Number of Channels:** 3 independent 16-bit counters
- **Interface:** Parallel, 8-bit data bus
- **Package:** DIP (Dual In-line Package), likely 24-pin
- **Operating Temperature Range:** Commercial (0°C to +70°C) or Industrial (-40°C to +85°C), depending on variant
### **Descriptions:**
- The UPD8253C-5 is a CMOS version of the industry-standard 8253/8254 programmable interval timer.
- It is designed for timing and event-counting applications in microprocessor-based systems.
- Each of the three counters can operate independently in different modes.
### **Features:**
- **Three Independent 16-Bit Counters:** Each counter can be programmed for different timing or counting functions.
- **Six Programmable Modes:**
- Mode 0: Interrupt on Terminal Count
- Mode 1: Programmable One-Shot
- Mode 2: Rate Generator
- Mode 3: Square Wave Generator
- Mode 4: Software-Triggered Strobe
- Mode 5: Hardware-Triggered Strobe
- **Binary or BCD Counting:** Supports both binary (0-FFFFh) and BCD (0-9999) counting modes.
- **Low Power Consumption:** Due to CMOS technology.
- **Compatibility:** Functionally similar to Intel’s 8253/8254 but with improved power efficiency.
This information is based on NEC’s official documentation and industry-standard specifications for the 8253/8254 PIT family.
