Overview
The SN74LV245ANSR, produced by Texas Instruments, is an octal bus transceiver with 3-state outputs designed for asynchronous communication between data buses. This device operates within a voltage range of 2 V to 5.5 V, making it versatile for various applications. It features a direction-control input (DIR) that determines the direction of data transmission between the A and B buses, and an output-enable input (OE) that can isolate the buses when necessary. The device is built using CMOS technology, which provides low power consumption and high performance.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 5.5 | |
| VIH (High-Level Input Voltage) | V | 1.5 (VCC = 2 V) | VCC × 0.7 (VCC = 2.3 V to 5.5 V) | |
| VIL (Low-Level Input Voltage) | V | 0.5 (VCC = 2 V) | VCC × 0.3 (VCC = 2.3 V to 5.5 V) | |
| tpd (Propagation Delay) | ns | 6.5 (at 5 V, CL = 15 pF) | 13 (at 5 V, CL = 15 pF) | |
| IOZ (High-Impedance State Current) | µA | ±5 | ||
| ICC (Quiescent Current) | µA | 20 (at 5 V) | ||
| Ioff (Partial-Power-Down Current) | µA | 5 |
Key Features
- Operates over a voltage range of 2 V to 5.5 V, allowing for mixed-mode voltage operation on all ports.
- Maximum propagation delay of 6.5 ns at 5 V with a load capacitance of 15 pF.
- Supports partial-power-down mode operation with Ioff circuitry to prevent damaging current backflow.
- ESD protection exceeds JESD 22 standards: 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Latch-up performance exceeds 250 mA per JESD 17.
- Slow edge rates minimize output ringing and overshoot/undershoot.
- Allows down voltage translation from 5 V to 3.3 V, with inputs accepting voltage levels up to 5.5 V).
Applications
- Servers
- LED displays
- Network switches
- Telecom infrastructure
- Motor drivers
- I/O expanders
Q & A
- What is the operating voltage range of the SN74LV245ANSR? The device operates within a voltage range of 2 V to 5.5 V.
- What is the maximum propagation delay at 5 V? The maximum propagation delay at 5 V with a load capacitance of 15 pF is 6.5 ns.
- Does the SN74LV245ANSR support partial-power-down mode? Yes, it supports partial-power-down mode operation with Ioff circuitry.
- What kind of ESD protection does the SN74LV245ANSR have? The device has ESD protection exceeding JESD 22 standards: 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- How does the SN74LV245ANSR handle latch-up performance? The latch-up performance exceeds 250 mA per JESD 17.
- What is the purpose of the DIR and OE inputs? The DIR input determines the direction of data transmission between the A and B buses, and the OE input can isolate the buses when necessary.
- Can the SN74LV245ANSR handle voltage translation? Yes, it allows down voltage translation from 5 V to 3.3 V, with inputs accepting voltage levels up to 5.5 V.
- What are some common applications for the SN74LV245ANSR? Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- How does the SN74LV245ANSR minimize output ringing? The device uses slow edge rates to minimize output ringing and overshoot/undershoot.
- What is the package type for the SN74LV245ANSR? The device is available in various packages including SOIC, SSOP, TSSOP, TVSOP, and VQFN.
