Overview
The SN74GTL2003, produced by Texas Instruments, is an 8-bit bidirectional low-voltage translator. This device is designed to provide seamless voltage level translation between different voltage domains, ranging from 0.95 V to 5 V, without the need for a direction control pin. It features eight NMOS pass transistors with a common gate (GREF) and a reference transistor (SREF and DREF), enabling bidirectional data flow with minimal propagation delay. The SN74GTL2003 is particularly useful in mixed-voltage systems, ensuring compatibility and efficient communication between components operating at different voltage levels.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range | 0.95 V | - | 5 V | V |
| ON-State Resistance | - | 50-70 Ω | - | Ω |
| Propagation Delay (Sn to Dn, Dn to Sn) | 0.5 ns | 1.5 ns | 5.5 ns | ns |
| ESD Protection | - | - | Integrated ESD circuitry | - |
| Package Options | - | - | TSSOP (20-pin), VQFN (20-pin) | - |
| Operating Temperature Range | -40°C | - | 85°C | °C |
Key Features
- Bidirectional Voltage Translation: Allows voltage level translation from 0.95 V to 5 V without a direction control pin.
- Low ON-State Resistance: Minimal propagation delay due to low ON-state resistance of the switch.
- Integrated ESD Protection: Provides excellent ESD protection with integrated ESD circuitry.
- Flow Through Pinout: Allocated pins for input and output reduce the need for multi-layer board layout or long traces.
- Matching Transistors: All transistors have the same electrical characteristics, ensuring superior matching and minimal deviation in voltage or propagation delay.
Applications
- Mixed-Voltage Systems: Ideal for systems requiring communication between components operating at different voltage levels.
- I2C or SMBus Applications: Suitable for bidirectional translation to multiple higher voltage levels.
- Unidirectional Down Translation: Protects low-voltage processor pins by translating higher voltage levels down to lower voltage levels.
- Unidirectional Up Translation: Translates lower voltage levels up to higher voltage levels for compatibility with higher-voltage chipsets.
Q & A
- What is the operating voltage range of the SN74GTL2003?
The SN74GTL2003 operates within a voltage range of 0.95 V to 5 V.
- Does the SN74GTL2003 require a direction control pin for voltage translation?
No, the SN74GTL2003 does not require a direction control pin for bidirectional voltage translation.
- What is the typical ON-state resistance of the SN74GTL2003?
The typical ON-state resistance is around 50-70 Ω.
- What are the package options available for the SN74GTL2003?
The SN74GTL2003 is available in TSSOP (20-pin) and VQFN (20-pin) packages.
- What is the operating temperature range of the SN74GTL2003?
The operating temperature range is from -40°C to 85°C.
- Does the SN74GTL2003 have built-in ESD protection?
- How does the flow through pinout of the SN74GTL2003 benefit board design?
The flow through pinout reduces the need for multi-layer board layout or long traces through the system.
- What are some common applications of the SN74GTL2003?
Common applications include mixed-voltage systems, I2C or SMBus applications, unidirectional down translation, and unidirectional up translation.
- How do you ensure proper current limiting through the pass transistors?
Proper current limiting is achieved by sizing pullup resistors to limit the current through the pass transistor to about 15 mA.
- What are the recommended design requirements for using the SN74GTL2003?
Recommended design requirements include using industry standard GTL and LVTTL/TTL voltage levels, placing pullup resistors of around 200 kΩ, and using 0.1-μF bypass capacitors close to the power supply pins.
