SN74ABT162841 - 20-Bit Bus-Interface D-Type Latch | TI
Артикул: SN74ABT162841 ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $2.5 | $2,50 |
| 10 | $2.2 | $22,00 |
| 100 | $1.8 | $180,00 |
| 500 | $1.5 | $750,00 |
| 1.000 | $1.2 | $1.200,00 |
SN74ABT162841 Обзор
A bus-interface D-type latch is a digital logic component that captures data on its D inputs when the latch enable (LE) signal is asserted, holding the data on its Q outputs until the next enable pulse. It is a fundamental building block in digital systems for temporary data storage, bus isolation, and signal synchronization. In the hierarchy of digital logic, it belongs to the category of latches, which are level-sensitive storage elements, as opposed to edge-triggered flip-flops. Latches are essential in microprocessor systems, memory interfaces, and data acquisition circuits where multiple data lines must be captured simultaneously.
Key features of the SN74ABT162841 include 3-state outputs that allow connection to a shared bus without contention, a flow-through architecture that simplifies PCB layout, and distributed VCC and GND pins that minimize high-speed switching noise. The device also supports hot insertion with Ioff and power-up 3-state, and its latch-up performance exceeds 500 mA per JEDEC standards. The EPIC-B BiCMOS design significantly reduces power dissipation compared to bipolar logic, making it suitable for high-density systems.
Technically, the SN74ABT162841 uses a BiCMOS process that combines the speed of bipolar transistors with the low power of CMOS. The outputs have equivalent 25-ohm series resistors, eliminating the need for external resistors in many applications. The device is characterized for operation from -40°C to 85°C, and it is RoHS compliant. The 3-state outputs are controlled by an output enable (OE) input, which places the outputs in a high-impedance state when asserted high, allowing multiple devices to share a bus.
Typical applications include memory address latching, data bus buffering in microprocessor systems, and interface circuits for industrial control and telecommunications equipment. The wide operating voltage range and high drive capability make it ideal for 5V systems that require robust signal integrity. The flow-through pinout aligns inputs and outputs on opposite sides, simplifying board routing and reducing crosstalk.
When designing with this device, ensure that the OE and LE inputs are properly driven to avoid bus contention. The 3-state outputs allow multiple latches to share a bus, but only one should be enabled at a time. Consider the propagation delay and setup/hold times when designing timing margins for high-speed applications.
Аналоги без доработки для SN74ABT162841 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
SN74ABT162841DLR
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SN74ABT162841DGVR
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SN74ABT162841DL
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74ABT162841DL
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SN74ABT162841DGGR
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SN74ABT162841 Максимальные параметры и электрические характеристики
| Number of Channels | 2 |
| Number of Bits per Channel | 10 |
| Logic Family | ABT |
| Тип выхода | 3-State |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Propagation Delay Time | 4.6 ns (typical) |
| Диапазон рабочих температур | -40°C to 85°C |
| Package Type | 56-SSOP (DL), 56-TSSOP (DLR) |
| Тип монтажа | Surface Mount |
| Latch Type | D-Type Transparent |
| Input Type | Noninverting |
| Output Ground Bounce | <0.8 V at VCC = 5 V, TA = 25°C |
| Latch-Up Performance | Exceeds 500 mA per JEDEC |
| Статус RoHS | Compliant |
Конфигурация выводов SN74ABT162841
| Контакт 1 | 1D1 — Data input 1 for channel 1 |
| Контакт 2 | 1D2 — Data input 2 for channel 1 |
| Контакт 3 | 1D3 — Data input 3 for channel 1 |
| Контакт 4 | 1D4 — Data input 4 for channel 1 |
| Контакт 5 | 1D5 — Data input 5 for channel 1 |
| Контакт 6 | 1D6 — Data input 6 for channel 1 |
| Контакт 7 | 1D7 — Data input 7 for channel 1 |
| Контакт 8 | 1D8 — Data input 8 for channel 1 |
| Контакт 9 | 1D9 — Data input 9 for channel 1 |
| Контакт 10 | 1D10 — Data input 10 for channel 1 |
| Контакт 11 | GND — Ground |
| Контакт 12 | 1LE — Latch enable for channel 1 |
| Контакт 13 | 1OE — Output enable for channel 1 (active low) |
| Контакт 14 | 1Q1 — Output 1 for channel 1 |
| Контакт 15 | 1Q2 — Output 2 for channel 1 |
| Контакт 16 | 1Q3 — Output 3 for channel 1 |
| Контакт 17 | 1Q4 — Output 4 for channel 1 |
| Контакт 18 | 1Q5 — Output 5 for channel 1 |
| Контакт 19 | 1Q6 — Output 6 for channel 1 |
| Контакт 20 | 1Q7 — Output 7 for channel 1 |
| Контакт 21 | 1Q8 — Output 8 for channel 1 |
| Контакт 22 | 1Q9 — Output 9 for channel 1 |
| Контакт 23 | 1Q10 — Output 10 for channel 1 |
| Контакт 24 | GND — Ground |
| Контакт 25 | 2D1 — Data input 1 for channel 2 |
| Контакт 26 | 2D2 — Data input 2 for channel 2 |
| Контакт 27 | 2D3 — Data input 3 for channel 2 |
| Контакт 28 | 2D4 — Data input 4 for channel 2 |
| Контакт 29 | 2D5 — Data input 5 for channel 2 |
| Контакт 30 | 2D6 — Data input 6 for channel 2 |
| Контакт 31 | 2D7 — Data input 7 for channel 2 |
| Контакт 32 | 2D8 — Data input 8 for channel 2 |
| Контакт 33 | 2D9 — Data input 9 for channel 2 |
| Контакт 34 | 2D10 — Data input 10 for channel 2 |
| Контакт 35 | GND — Ground |
| Контакт 36 | 2LE — Latch enable for channel 2 |
| Контакт 37 | 2OE — Output enable for channel 2 (active low) |
| Контакт 38 | 2Q1 — Output 1 for channel 2 |
| Контакт 39 | 2Q2 — Output 2 for channel 2 |
| Контакт 40 | 2Q3 — Output 3 for channel 2 |
| Контакт 41 | 2Q4 — Output 4 for channel 2 |
| Контакт 42 | 2Q5 — Output 5 for channel 2 |
| Контакт 43 | 2Q6 — Output 6 for channel 2 |
| Контакт 44 | 2Q7 — Output 7 for channel 2 |
| Контакт 45 | 2Q8 — Output 8 for channel 2 |
| Контакт 46 | 2Q9 — Output 9 for channel 2 |
| Контакт 47 | 2Q10 — Output 10 for channel 2 |
| Контакт 48 | GND — Ground |
| Контакт 49 | VCC — Power supply (5V) |
| Контакт 50 | VCC — Power supply (5V) |
| Контакт 51 | VCC — Power supply (5V) |
| Контакт 52 | VCC — Power supply (5V) |
| Контакт 53 | GND — Ground |
| Контакт 54 | GND — Ground |
| Контакт 55 | GND — Ground |
| Контакт 56 | GND — Ground |
Типичное применение
SN74ABT162841 подходит для 6 применениеs: Memory Address Latching, Data Bus Buffering, Industrial Control Interfaces, Telecommunications Equipment, Test and Measurement Equipment, Automotive Electronics.
Memory Address Latching
The SN74ABT162841 is used to latch address lines in microprocessor and memory systems. Its 20-bit width and 3-state outputs allow it to capture a full address bus and hold it stable during memory access cycles. The fast propagation delay of 4.6 ns ensures minimal timing skew, and the high drive capability handles the capacitive load of multiple memory devices. The flow-through architecture simplifies PCB routing, reducing signal crosstalk and improving signal integrity in high-speed designs.
Рекомендуется
Data Bus Buffering
In microprocessor systems, the SN74ABT162841 can buffer data buses, providing isolation and driving capability. Its 3-state outputs allow multiple devices to share the bus without contention, and the Ioff feature supports hot insertion. The device's low ground bounce (<0.8V) minimizes noise on the bus, ensuring reliable data transfer. With a 5V supply, it is compatible with legacy TTL logic levels, making it ideal for mixed-voltage systems.
Рекомендуется
Industrial Control Interfaces
The SN74ABT162841 is used in industrial control systems to interface between a controller and field devices. Its wide operating temperature range (-40°C to 85°C) and robust latch-up performance (>500 mA) make it suitable for harsh environments. The 3-state outputs allow multiple control modules to share a common bus, and the high drive capability ensures signals reach remote sensors and actuators without degradation. The device's flow-through pinout simplifies wiring in backplane designs.
Рекомендуется
Telecommunications Equipment
In telecommunications, the SN74ABT162841 is used for data latching in switching and routing equipment. Its high-speed operation (4.6 ns propagation delay) supports high-throughput data paths, and the 3-state outputs enable bus sharing in multi-line systems. The device's low power dissipation, thanks to BiCMOS technology, is critical in densely populated equipment racks. The hot insertion capability allows line cards to be replaced without powering down the system, improving serviceability.
Рекомендуется
Test and Measurement Equipment
The SN74ABT162841 is used in test and measurement instruments to capture digital signals for analysis. Its 20-bit width allows simultaneous sampling of multiple channels, and the 3-state outputs enable connection to a shared data acquisition bus. The device's high drive capability ensures signals are transmitted accurately over long cables, and the low ground bounce preserves signal integrity. The flow-through architecture simplifies PCB design in compact instruments.
Рекомендуется
Automotive Electronics
The SN74ABT162841 is used in automotive electronics for body control modules and infotainment systems. Its wide temperature range and robust latch-up performance meet automotive requirements. The 3-state outputs allow multiple ECUs to share a bus, and the low power dissipation reduces heat in the cabin. The device's hot insertion capability is useful for diagnostic and programming interfaces. However, for AEC-Q100 qualified parts, consider the SN74ABT162841-Q1 variant if available.
Рекомендуется
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Справочные инженерные данные для SN74ABT162841 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | SN74ABT162841DLR | SN74ABT162841DGVR | 74ABT162841DL |
|---|---|---|---|---|
| Package | 56-SSOP (DL) | 56-TSSOP (DLR) | 56-TVSOP (DGV) | 56-SSOP (DL) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Number of Bits | 20 | 20 | 20 | 20 |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Output Type | 3-State | 3-State | 3-State | 3-State |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C |
| RoHS | Compliant | Compliant | Compliant | Compliant |
Ключевые отличия
- 20-bit width in a single package (против SN74ABT162245 (16-bit transceiver))
- Flow-through architecture (против SN74ABT162841DLR (TSSOP))
- Hot insertion support (против 74ABT162841DL (NXP))
Заметки по проектированию
The SN74ABT162841 has a flow-through architecture with inputs on one side and outputs on the other, which simplifies PCB layout. Use a 0.1uF decoupling capacitor near each VCC pin (pins 49-52) and connect all GND pins (11, 24, 35, 48, 53-56) to a solid ground plane. Keep traces short to minimize inductance and reduce ground bounce.
The outputs have equivalent 25-ohm series resistors, which help match impedance and reduce ringing. For long traces or high capacitive loads, consider adding external series resistors if needed. The device's low ground bounce (<0.8V) helps maintain signal integrity, but proper termination is still recommended for high-speed signals.
Ensure that the OE (output enable) inputs are not left floating; tie them to GND to enable outputs or to VCC to disable. The LE (latch enable) inputs should be driven with clean signals to avoid unintended latching. Also, do not exceed the absolute maximum ratings, and ensure the supply voltage is within 4.5V to 5.5V to avoid damage.
Информация о соответствии
RoHS compliant per TI product page. Not AEC-Q100 qualified; for automotive, consider SN74ABT162841-Q1 if available.
