SN74VMEH22501_TI 具有三态输出的 8 位通用总线收发器和两个 1 位总线收发器

制造厂商：TI
产品类别：逻辑和电压转换
技术类目：缓冲器、驱动器和收发器 - 通用收发器
功能描述：具有三态输出的 8 位通用总线收发器和两个 1 位总线收发器
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SN74VMEH22501的产品详情：

The SN74VMEH22501 8-bit universal bus transceiver has two integral 1-bit three-wire bus transceivers and is designed for 3.3-V V_CCoperation with 5-V tolerant inputs. The UBT™ transceiver allows transparent, latched, and flip-flop modes of data transfer, and the separate LVTTL input and outputs on the bus transceivers provide a feedback path for control and diagnostics monitoring. This device provides a high-speed interface between cards operating at LVTTL logic levels and VME64, VME64x, or VME320⁽¹⁾ backplane topologies.

High-speed backplane operation is a direct result of the improved OEC™ circuitry and high drive that has been designed and tested into the VME64x backplane model. The B-port I/Os are optimized for driving large capacitive loads and include pseudo-ETL input thresholds (½ V_CC ± 50 mV) for increased noise immunity. These specifications support the 2eVME protocols in VME64x (ANSI/VITA 1.1) and 2eSST protocols in VITA 1.5. With proper design of a 21-slot VME system, a designer can achieve 320-Mbyte transfer rates on linear backplanes and, possibly, 1-Gbyte transfer rates on the VME320 backplane.

All inputs and outputs are 5-V tolerant and are compatible with TTL and 5-V CMOS inputs.

Active bus-hold circuitry holds unused or undriven 3A-port inputs at a valid logic state. Bus-hold circuitry is not provided on 1A or 2A inputs, any B-port input, or any control input. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

This device is fully specified for live-insertion applications using I_off, power-up 3-state, and BIAS V_CC. The I_off circuitry prevents damaging current to backflow through the device when it is powered off/on. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict. The BIAS V_CC circuitry precharges and preconditions the B-port input/output connections, preventing disturbance of active data on the backplane during card insertion or removal, and permits true live-insertion capability.

When V_CC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, output-enable (OE and OEBY) inputs should be tied to V_CC through a pullup resistor and output-enable (OEAB) inputs should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the drive capability of the device connected to this input.

SN74VMEH22501的优势和特性：

Member of the Texas Instruments Widebus? Family
UBT? Transceiver Combines D-Type Latches and D-Type Flip-Flops for Operation in Transparent, Latched, or ClockedModes
OEC? Circuitry Improves Signal Integrity and Reduces Electromagnetic Interference (EMI)
Compliant With VME64, 2eVME, and 2eSST Protocol
Bus Transceiver Split LVTTL Port Provides a Feedback Path for Control and Diagnostics Monitoring
I/O Interfaces Are 5-VTolerant
B-Port Outputs (–48mA/64mA)
Y and A-Port Outputs (–12mA/12mA)
Ioff, Power-Up 3-State, and BIAS VCC Support LiveInsertion
Bus Hold on 3A-Port Data Inputs
26- Equivalent Series Resistor on 3APorts and YOutputs
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, ClassII
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

MicroStar is a trademark of Texas Instruments. (1) VME320 is a patented backplane construction by Arizona Digital, Inc.

SN74VMEH22501的参数（英文）：

IOL (Max) (mA)
12
IOH (Max) (mA)
-24
Technology Family
VME
Rating
Catalog
Operating temperature range (C)
0 to 85

SN74VMEH22501具体的完整产品型号参数及价格（美元）：

SN74VMEH22501的完整型号有：SN74VMEH22501DGG、SN74VMEH22501DGGR、SN74VMEH22501DGVR，以下是这些产品的关键参数及官网采购报价：

SN74VMEH22501DGG，工作温度：0 to 85，封装：TSSOP (DGG)-48，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74VMEH22501DGG的批量USD价格：USD（1000+）

SN74VMEH22501DGGR，工作温度：0 to 85，封装：TSSOP (DGG)-48，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74VMEH22501DGGR的批量USD价格：2.391（1000+）

SN74VMEH22501DGVR，工作温度：0 to 85，封装：TVSOP (DGV)-48，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74VMEH22501DGVR的批量USD价格：2.391（1000+）

SN74VMEH22501的评估套件：

SN74VMEH22501的电路图解：

SN74VMEH22501的评估套件：