Technical specifications for Epson SG-636 and SG-645 crystal oscillators, including frequency range, supply voltage, temperature limits and pinout.
The Epson SG-636 and SG-645 series are crystal oscillators designed for a wide range of electronic applications. They offer output frequencies from 2.21675 MHz up to 135 MHz and support multiple supply voltages (2.5 V, 3.3 V, 5.0 V) with various load conditions.
The datasheet provides detailed electrical characteristics, mechanical dimensions, pin assignments, and environmental compliance information. It also includes notes on recommended bypass capacitors and the function of OE and ST pins for enabling or disabling the output.
| Output frequency range | 2.21675 MHz to 135 MHz |
|---|---|
| Supply voltage | 2.5 V, 3.3 V, 5.0 V |
| Storage temperature | -55 °C to +100 °C (SG‑636), -55 °C to +125 °C (SG‑645) |
| Operating temperature | -20 °C to +70 °C |
| Frequency tolerance | ±100 ppm (C) / ±50 ppm (B) |
| Current consumption (max) | 45 mA (SG‑645 PTW/ STW) |
| Output voltage (VOH) low level | VCC‑0.4 V min |
| Input voltage high (VIH) | 2.0 V min |
| Rise/Fall time | ≤7 ns (TTL), ≤5 ns (CMOS) |
| Start‑up time | 4 ms (SG‑636), 10‑12 ms (SG‑645) |
| Frequency aging | ±5 ppm/year |
The SG‑636 and SG‑645 series cover frequencies from 2.21675 MHz up to 135 MHz.
The SG‑645 series can operate from 2.5 V, 3.3 V, or 5.0 V supply voltages.
The SG‑636 package measures 7.1 mm × 5.1 mm × 1.5 mm (L × W × H).
Place a 0.01 µF to 0.1 µF bypass capacitor as close as possible to the VCC‑GND pins of the crystal product.