Overview
The SN74VMEH22501ZQLR, 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 combines D-type latches and D-type flip-flops, allowing operation in transparent, latched, or flip-flop modes. The device is particularly suited for interfacing between cards operating at LVTTL logic levels and VME64, VME64x, or VME320 backplane topologies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Free-Air Temperature | 0 to 85 | °C |
| Supply Voltage (VCC) | 3.3 | V |
| High-Level Input Voltage (VIH) | 0.5 VCC + 50 mV | V |
| Low-Level Input Voltage (VIL) | 0.5 VCC - 50 mV | V |
| High-Level Output Current (IOH) | -48 (B port), -12 (3A port and Y output) | mA |
| Low-Level Output Current (IOL) | 64 (B port), 12 (3A port and Y output) | mA |
| Input Transition Rise or Fall Rate | 10 | ns/V |
| Power-Up Ramp Rate | 20 | ms/V |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
Key Features
- Member of the Texas Instruments Widebus™ family
- ESD protection exceeds JESD 22 standards
- UBT™ transceiver combines D-type latches and D-type flip-flops for transparent, latched, or flip-flop modes of operation
- 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 SN74VMEH22501ZQLR 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:
- VME (VersaModule Eurocard) systems
- High-speed data transmission and reception
- Industrial control systems requiring robust and reliable data transfer
- Embedded systems needing live insertion capabilities
Q & A
- What is the primary function of the SN74VMEH22501ZQLR?
The SN74VMEH22501ZQLR is an 8-bit universal bus transceiver with two integral 1-bit three-wire bus transceivers, designed for high-speed data transfer in various modes (transparent, latched, or flip-flop).
- What are the operating voltage and temperature ranges for this device?
The device operates at a supply voltage (VCC) of 3.3 V and has an operating free-air temperature range of 0 to 85°C.
- What protocols is the SN74VMEH22501ZQLR compliant with?
The device is compliant with VME64, 2eVME, and 2eSST protocols.
- Does the SN74VMEH22501ZQLR support live insertion?
Yes, it supports live insertion with features like Ioff, power-up 3-state, and BIAS VCC.
- What is the significance of the feedback path provided by the split LVTTL port?
The feedback path provided by the split LVTTL port is used for control and diagnostics monitoring.
- How does the device protect against electromagnetic interference (EMI)?
The device includes OEC™ circuitry that improves signal integrity and reduces electromagnetic interference (EMI).
- What are the output current capabilities of the SN74VMEH22501ZQLR?
The device can drive up to -48 mA (low) and 64 mA (high) on the B port, and up to -12 mA (low) and 12 mA (high) on the 3A port and Y outputs.
- What is the purpose of the distributed VCC and GND pins?
The distributed VCC and GND pins help minimize high-speed switching noise.
- Does the SN74VMEH22501ZQLR have any special ESD protection features?
Yes, it has ESD protection that exceeds JESD 22 standards, including 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What types of packages are available for the SN74VMEH22501ZQLR?
The device is available in BGA MicroStar™, TSSOP, TVSOP, and VFBGA packages.
- Can the SN74VMEH22501ZQLR replace other transceiver functions?
Yes, it can replace functions of various other transceivers, buffers, latches, and flip-flops, such as '245, '623, '645, etc.
