Overview
The SN74VMEH22501DGGR, produced by Texas Instruments, is an 8-bit universal bus transceiver with two integral 1-bit three-wire bus transceivers. This device is designed for 3.3-V VCC operation and features 5-V tolerant inputs, making it versatile for various high-speed applications. It is part of the Texas Instruments Widebus™ family and is compliant with VME64, 2eVME, and 2eSST protocols. The transceiver supports transparent, latched, and flip-flop modes of data transfer, enhancing its functionality in different operational scenarios.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | -0.5 | 4.6 | V | |
| Input Voltage Range (VI) | -0.5 | 7 | V | |
| Output Current in Low State (IOL) | -50 | -64 | mA (B port) | |
| Output Current in High State (IOH) | 12 | -48 | mA (B port) | |
| Operating Free-Air Temperature (TA) | 0 | 85 | °C | |
| Transition Time, B Port (10%–90%) | 4.3 | ns | ||
| Power-Up Ramp Rate (Δt/ΔVCC) | 20 | ms/V |
Key Features
- Member of the Texas Instruments Widebus™ family
- ESD protection exceeds JESD 22 standards (2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model)
- UBT™ transceiver combines D-type latches and D-type flip-flops for operation in transparent, latched, or clocked modes
- OEC™ circuitry improves signal integrity and reduces electromagnetic interference (EMI)
- Compliant with VME64, 2eVME, and 2eSST protocols
- Bus transceiver split LVTTL port provides a feedback path for control and diagnostics monitoring
- I/O interfaces are 5-V tolerant
- Live-insertion capability with Ioff, power-up 3-state, and BIAS VCC support
- Bus hold on 3A-port data inputs and 26-Ω equivalent series resistor on 3A ports and Y outputs
- Flow-through architecture facilitates printed circuit board layout
- Distributed VCC and GND pins minimize high-speed switching noise
- Latch-up performance exceeds 100 mA per JESD 78, Class II
Applications
The SN74VMEH22501DGGR is designed for high-speed interface applications between cards operating at LVTTL logic levels and VME64, VME64x, or VME320 backplane topologies. It is particularly useful in systems requiring robust data transfer, such as:
- VME (VersaModule Eurocard) systems
- High-speed data acquisition and processing systems
- Industrial control and automation systems
- Telecommunication equipment
- Embedded systems requiring reliable and high-speed data transfer
Q & A
- What is the operating voltage range of the SN74VMEH22501DGGR?
The operating voltage range is from 0 to 4.6 V.
- What are the key protocols this device is compliant with?
The device is compliant with VME64, 2eVME, and 2eSST protocols.
- What types of ESD protection does the SN74VMEH22501DGGR offer?
The device offers ESD protection exceeding JESD 22 standards, including 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What are the different modes of operation for the UBT transceiver?
The UBT transceiver can operate in transparent, latched, or clocked modes.
- Does the SN74VMEH22501DGGR support live-insertion applications?
Yes, it supports live-insertion applications with Ioff, power-up 3-state, and BIAS VCC features.
- What is the significance of the OEC™ circuitry in this device?
The OEC™ circuitry improves signal integrity and reduces electromagnetic interference (EMI).
- What is the maximum output current in the low state for the B port?
The maximum output current in the low state for the B port is -64 mA.
- What is the transition time for the B port?
The transition time for the B port is approximately 4.3 ns.
- What is the operating temperature range for this device?
The operating temperature range is from 0°C to 85°C.
- What types of packages are available for the SN74VMEH22501?
The device is available in DGG, DGV, and GQL packages.
- How does the bus hold feature work on the 3A-port data inputs?
The bus hold feature on the 3A-port data inputs helps maintain the data state even when the input is not driven, preventing data loss.
