# SY89311UMG-TR

**Microchip Tech** · Buffers / Drivers · MLF-8

SY89311UMG-TR from Microchip Tech, in a MLF-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Q0 | output | Differential 100K PECL/ECL output that defaults LOW if the IN inputs are left open; see the Output Interface Applications section for termination recommendations. |
| 2 | /Q0 | output | Complementary differential 100K PECL/ECL output that defaults LOW if the IN inputs are left open; unused output pairs may be left floating without impact on skew or jitter. |
| 3 | Q1 | output | Differential 100K PECL/ECL output that defaults LOW if the IN inputs are left open; unused output pairs may be left floating without impact on skew or jitter. |
| 4 | /Q1 | output | Complementary differential 100K PECL/ECL output that defaults LOW if the IN inputs are left open; unused output pairs may be left floating without impact on skew or jitter. |
| 5 | VEE | power_in | Negative power supply, and the exposed pad must be tied to the most negative supply; for PECL/LVPECL operation connect to ground. |
| 6 | /IN | input | Complementary differential PECL/ECL input with internal 75kΩ pull-up and pull-down resistors that defaults to VCC/2 if left floating and may be left open when not used. |
| 7 | IN | input | Differential PECL/ECL input with internal 75kΩ pull-down resistor that defaults LOW (forcing Q LOW) if left open and accepts differential 10K and 100K ECL/PECL. |
| 8 | VCC | power_in | Positive power supply that should be bypassed with 0.1µF//0.01µF low ESR capacitors. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | MLF-8 |
| Category | Logic ICs |
| Pins | 9 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage /VCC-VEE/ (2.5V) | /VCC-VEE/ | 2.375 |  | 2.625 | V |  | 3 |
| Supply Voltage /VCC-VEE/ (3.3V) | /VCC-VEE/ | 3 |  | 3.6 | V |  | 3 |
| Supply Voltage /VCC-VEE/ (5V) | /VCC-VEE/ | 4.5 |  | 5.5 | V |  | 3 |
| Ambient Temperature | TA | -40 |  | 85 | °C |  | 3 |
| Supply Voltage (VCC) absolute maximum | VCC | -0.5 |  | 6 | V |  | 3 |
| Input Voltage | VIN | -0.5 |  |  | V |  | 3 |
| LVPECL Output Current Continuous | IOUT |  |  | 50 | mA | Continuous | 3 |
| LVPECL Output Current Surge | IOUT |  |  | 100 | mA | Surge | 3 |
| Input Current source or sink on IN, /IN |  | -50 |  | 50 | mA |  | 3 |
| Lead Temperature |  |  |  | 260 | °C | soldering, 20 sec. | 3 |
| Storage Temperature | TS | -65 |  | 150 | °C |  | 3 |
| Power Supply Voltage LVPECL (2.5V) | VCC | 2.375 | 2.5 | 2.625 | V |  | 3 |
| Power Supply Voltage LVPECL (3.3V) | VCC | 3 | 3.3 | 3.6 | V |  | 3 |
| Power Supply Voltage PECL (5V) | VCC | 4.5 | 5 | 5.5 | V |  | 3 |
| Power Supply Voltage ECL | VCC | -5.5 | -5 | -4.5 | V |  | 3 |
| Power Supply Voltage LVECL (-3.3V) | VCC | -3.6 | -3.3 | -3 | V |  | 3 |
| Power Supply Voltage LVECL (-2.5V) | VCC | -2.625 | -2.5 | -2.375 | V |  | 3 |
| Power Supply Current | IEE |  | 30 | 44 | mA | Max. VCC, no load | 3 |
| Input HIGH Current | IIH |  |  | 150 | µA | VIN = VIH | 3 |
| Input LOW Current (IN) | IIL |  |  | 0.5 | µA | VIN = VIL | 3 |
| Input LOW Current (/IN) | IIL |  |  | -150 | µA | VIN = VIL | 3 |
| Input Capacitance | CIN |  | 1 |  | pF |  | 3 |
| Maximum Toggle Frequency | fMAX | 3 |  |  | GHz |  | 4 |
| Propagation Delay (Differential) IN to Q, /Q | tpd | 140 | 170 | 220 | ps | VCC = 3.3V/5V | 4 |
| Propagation Delay (Differential) IN to Q, /Q | tpd | 240 | 300 | 360 | ps | VCC = 2.5V | 4 |
| Within-Device Skew Q, /Q | tSKEW |  | 5 | 20 | ps | Note 8 | 4 |
| Part-to-Part Skew |  |  |  | 150 | ps | VCC = 3.3V/5V, Note 8 | 4 |
| Part-to-Part Skew |  |  |  | 120 | ps | VCC = 2.5V, Note 8 | 4 |
| Cycle-to-Cycle Jitter (rms) | tJITTER |  |  | 1 | ps(rms) |  | 4 |
| Input Swing | VDIFF | 150 | 800 | 1200 | mV | Note 9 | 4 |
| Output Rise/Fall Time (20% to 80%) | tr, tf | 70 | 120 | 200 | ps | 20% to 80% | 4 |
| Differential Output Swing | VDIFF_OUT | 400 |  |  | mV | Measured with 750mV input signal, 50% duty cycle (Note 7) | 4 |
| Additive Phase Jitter |  |  | 51 |  | fs(rms) | 622MHz over 12kHz-20MHz | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | Part Number Package Type Operating Range Package Marking Lead Finish SY89311UMITR MLF-8 Industrial 311 Sn-Pb | 2 |

## CAD (KiCad official)

- Symbol: `SY89311UMG-TR`
- Footprint: `Package_DFN_QFN:MLF-8-1EP_3x3mm_P0.65mm_EP1.55x2.3mm`
- 3D model: MLF-8 (KiCad packages3D, STEP)
- 3D model files: `sy89311umg-tr-etched.step` / `sy89311umg-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sy89311umg-tr.step` / `sy89311umg-tr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Microchip Tech datasheet](docs/sy89311umg-tr-datasheet.pdf) (10 pp, sha256 `bfd6eed520b603ab`, retrieved 2026-10-30, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/sy89311umg-tr-datasheet.pdf)