SN74ALVCH162373 - 16-Bit 3-State Transparent Latch | TI
N.º da peça: SN74ALVCH162373 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.95 | $0,95 |
| 10 | $0.86 | $8,60 |
| 100 | $0.68 | $68,00 |
| 500 | $0.55 | $275,00 |
| 1.000 | $0.45 | $450,00 |
SN74ALVCH162373 Visão geral
A transparent latch is a sequential logic component that passes input data to outputs while enabled and stores the last value when disabled. It sits in the hierarchy: transparent latch -> D-type latch -> latch -> sequential logic -> digital logic IC, and is a fundamental building block for data storage, synchronization, and bus interfacing in digital systems.
Key features include bus-hold circuitry on data inputs, which eliminates external pull-up or pull-down resistors; equivalent 26-ohm series resistors on output ports, removing the need for external line-termination resistors; and latch-up performance exceeding 250 mA per JESD 17, plus ESD protection. The 3-state outputs allow multiple devices to share a common bus, and the Ioff feature supports partial-power-down operation without backflow current.
Technically, the device uses advanced low-voltage CMOS technology, providing high speed with low static power consumption. Propagation delay is typically around 4.1 ns at 3.3V, with +/-12 mA output drive at 3.3V, suitable for moderate capacitive loads. It is characterized for operation from -40C to +85C in industrial environments. Packages include 48-SSOP (DL), 48-TSSOP (DGG/GR), and 56-BGA MicroStar Junior (KR).
Typical applications per the TI datasheet include buffer registers, I/O ports, bidirectional bus drivers, and working registers in memory interfaces, data acquisition systems, and general-purpose logic.
Design tip: place 0.1uF decoupling capacitors close to each VCC pin, and verify timing margins since the integrated 26-ohm output resistors slightly slow edge rates at high frequencies.
Alternativas drop-in para SN74ALVCH162373 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SN74LVTH162373DGG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
SN74ALVCH16374DGG
⚡ Mesmo encapsulamento ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
74ALVCH162373ADGG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
74LVCH162373ADGG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
SN74ALVCH162373 Classificações máximas e características elétricas
| Logic Function | 16-bit transparent D-type latch |
| Family | ALVCH (Widebus, low-voltage CMOS) |
| Supply Voltage Range | 2.3 V to 3.6 V |
| Tipo de saída | 3-state |
| Propagation Delay (typ) | 4.1 ns at 3.3 V |
| Output Drive | +/-12 mA at 3.3 V |
| Bus Hold on Data Inputs | Yes |
| Output Series Resistor | 26 ohm equivalent |
| Latch-Up Performance | Exceeds 250 mA per JESD 17 |
| ESD Protection | Yes |
| Ioff (Partial Power-Down) | Yes |
| Temperatura de operação | -40C to +85C |
| Packages | 48-SSOP (DL), 48-TSSOP (DGG/GR), 56-BGA MicroStar Junior (KR) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Configuration | Two 8-bit latches or one 16-bit latch |
Configuração de pinos do SN74ALVCH162373
| Pino 1 | OE1 — Output enable 1 (active-low) for lower 8 bits |
| Pino 2 | 1D1 — Data input, latch 1 bit 1 |
| Pino 3 | 1Q1 — 3-state output, latch 1 bit 1 |
| Pino 9 | 1LE — Latch enable 1 (high = transparent) |
| Pino 10 | GND — Ground |
| Pino 25 | 2LE — Latch enable 2 (high = transparent) |
| Pino 26 | 2Q8 — 3-state output, latch 2 bit 8 |
| Pino 27 | 2D8 — Data input, latch 2 bit 8 |
| Pino 36 | OE2 — Output enable 2 (active-low) for upper 8 bits |
| Pino 48 | VCC — Power supply, 2.3V to 3.6V |
Aplicações típicas
SN74ALVCH162373 é adequado para 6 aplicaçãos: Buffer Registers, I/O Ports, Bidirectional Bus Drivers, Memory Interface Data Latching, Data Acquisition Systems, Working Registers in General-Purpose Logic.
Buffer Registers
The SN74ALVCH162373 is explicitly recommended by the TI datasheet for implementing buffer registers. Its 16-bit width lets a single device buffer a full 16-bit data word between a microprocessor bus and peripheral logic, while the 3-state outputs tri-state the buffer for shared-bus access. Bus-hold inputs remove external pull resistors, and the 26-ohm output resistors damp line reflections on medium-length traces, reducing overshoot without series termination parts. At a typical 4.1 ns propagation delay, timing overhead is minimal in most register-buffer paths.
Recomendado
I/O Ports
For memory-mapped or GPIO expansion, the SN74ALVCH162373 serves as a 16-bit I/O port latching output data from a host bus. The latch-enable (LE) input holds presented data stable while the CPU moves on to other transactions, and the output-enable (OE) input gates the port onto the external bus only when addressed. The Ioff partial-power-down feature prevents bus contention and back-drive current when the port's supply rail is off in multi-rail systems, and +/-12 mA drive supports typical peripheral loads directly.
Recomendado
Bidirectional Bus Drivers
Paired devices can form bidirectional bus drivers: each SN74ALVCH162373 drives one direction while the opposite device tri-states via OE, sharing the common bus. The 3-state outputs guarantee high impedance when disabled, and the bus-hold inputs keep unused lines at valid levels, eliminating floating-node susceptibility in hot-socket or idle conditions. The integrated 26-ohm series resistors lower undershoot when driving heavily loaded backplanes, allowing directly-connected bus architectures without discrete termination resistor networks.
Recomendado
Memory Interface Data Latching
In SRAM/DRAM glue-logic interfaces, the SN74ALVCH162373 latches address or data buses during memory cycles, extending valid-data windows for slower memory devices. Its 4.1 ns typical delay adds negligible latency, while 2.3V-3.6V operation matches 3.3V memory rails directly. The 56-BGA MicroStar Junior (KR) package suits space-constrained embedded boards, and the -40C to +85C industrial rating covers deployed networking and industrial-control environments where memory buses run continuously.
Recomendado
Data Acquisition Systems
In data acquisition front-ends, the SN74ALVCH162373 captures ADC conversion results or digital sensor words, holding them stable while a slower processor reads them. The transparent-latch behavior with LE low freezes the sampled word, preventing torn reads during conversion updates. With 16 bits of latching in one device, board area and control-signal count drop versus discrete octal latches. JESD 17 latch-up performance exceeding 250 mA and ESD protection add robustness in industrial test racks with cable-connected inputs.
Recomendado
Working Registers in General-Purpose Logic
Per the TI datasheet, the device is suited for working registers that temporarily hold intermediate computation or status words in FPGA-glue, backplane, and microcontroller systems. Two independent 8-bit latch sections permit split control of two byte-wide registers with separate LE inputs, useful for asymmetric pipelines. Low static CMOS power suits always-on logic, and the 26-ohm outputs reduce EMI edge rates on board-level interconnect. The 48-TSSOP (DGG/GR) package balances footprint area with hand-assembly feasibility for prototyping.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SN74ALVCH162373 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SN74LVTH162373DGG | 74ALVCH162373ADGG | 74LVCH162373ADGG |
|---|---|---|---|---|
| Package | 48-TSSOP (DGG) / 48-SSOP (DL) / 56-BGA (KR) | 48-TSSOP (DGG) - same | 48-TSSOP (DGG) - same | 48-TSSOP (DGG) - same |
| Brand | Texas Instruments | Texas Instruments | Nexperia | Nexperia |
| Bits / Configuration | 16-bit transparent latch (2x8) | 16-bit transparent latch (2x8) | 16-bit transparent latch (2x8) | 16-bit transparent latch (2x8) |
| Supply Voltage | 2.3V - 3.6V | 2.7V - 3.6V | 1.65V - 3.6V | 2.3V - 3.6V |
| Bus-Hold Inputs | Yes | No | Yes | Yes |
| 5V-Tolerant Inputs | No | Yes | No | No |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Principais diferenciais
- Bus-hold data inputs eliminate external pull resistors (vs SN74LVTH162373DGG)
- Wider 2.3V-3.6V supply range (vs SN74LVTH162373DGG)
- Integrated 26-ohm output series resistors (vs 74LVCH162373ADGG)
Notas de projeto
Place a 0.1uF ceramic decoupling capacitor close to each VCC pin and add one 4.7uF-10uF bulk capacitor per device. With 16 outputs switching simultaneously, dynamic supply current spikes are significant; a solid, low-impedance ground plane under the device is essential. Keep D-input and Q-output trace stubs short to limit reflections, although the integrated 26-ohm output resistors already reduce the need for discrete series termination on most board-level traces.
Do not apply 5V signals to the SN74ALVCH162373 - it is not 5V tolerant and its 2.3V-3.6V supply range forbids 5V rails. If mixed-voltage buses are involved, choose the LVT family (SN74LVTH162373) or insert translators such as TXB0108. Also remember that DL (SSOP) and DGG/GR (TSSOP) are NOT footprint-compatible despite the same die - order the suffix matching your PCB land pattern.
The bus-hold circuitry drives inputs to their last valid level, which is beneficial for floating-line prevention but can fight lightly-driven buses or analog-style resistive dividers connected to D inputs - avoid using bus-hold inputs where a passive pull resistor sets the logic level. For long bus runs, the 26-ohm output series resistors damp undershoot; combine with controlled-impedance layout on traces longer than roughly 1/6 of the signal rise time electrically.
Informações de conformidade
RoHS compliant per TI product page. No AEC-Q100 automotive qualification data found in provided sources.
