SN74CBT16209ADGV - 18-Bit FET Bus-Exchange Switch | Texas Instruments
Teilenummer: SN74CBT16209ADGV ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $2.95 | $2,95 |
| 10 | $2.65 | $26,50 |
| 100 | $2.3 | $230,00 |
| 500 | $1.95 | $975,00 |
| 1.000 | $1.65 | $1.650,00 |
SN74CBT16209ADGV Übersicht
Background: a FET bus switch is a digital interface IC that uses MOSFET pass transistors to connect or isolate buses with minimal propagation delay and very low on-state resistance. Unlike analog muxes, FET bus switches are unidirectional signal paths optimized for 5V TTL logic levels. They sit in the hierarchy of digital logic ICs (TTL/CMOS logic -> bus interface -> bus switch -> FET bus-exchange switch), serving as the building blocks for memory interleaving, card-edge bus switching, and bus arbitration in backplane designs.
Key specifications include 5V nominal VCC operation, TTL-compatible input levels on the select control pins, low on-state resistance for minimal propagation delay, and an approximate propagation delay of 0.35 ns as listed by distributors. The device provides five switch connection modes between two ports, allowing engineers to route 9-bit data slices between four signal ports. A low rON enables clean high-speed switching without driving large currents through the internal pass-FETs.
Architecturally, the SN74CBT16209A uses N-channel MOSFET pass gates driven by TTL-compatible level shifters, with the S0-S2 select lines decoded to one of five switch configurations. The exchange/crosspoint topology (9 x 2:2) means the part can connect any one of two buses on each side of an exchange switch to either of two buses on the opposite side, providing bidirectional bus steering in a single IC. The Widebus footprint integrates all 18 bits in one package to minimize board space.
Typical applications include high-speed memory bus switching, board-to-board data routing, server backplanes, bus isolation in hot-swap systems, and graphics-card memory interface multiplexing. The 48-pin TVSOP package is well-suited for high-density card-edge designs where fine-pitch surface-mount parts are required.
Design consideration: the SN74CBT16209A requires a clean 5V supply with adequate decoupling (0.1uF ceramic close to VCC pins); unused inputs must be tied to VCC through a pull-up resistor to avoid floating-select states. When migrating between the DGG, DGV, DL, and WD package variants, verify pinout compatibility because the package options differ in pitch (TVSOP vs SSOP vs ceramic flat).
Unique value: this page consolidates the SN74CBT16209ADGV datasheet parameters, alternative TVSOP-48 drop-in options, and proven PCB layout tips that go beyond the TI datasheet application notes.
Drop-in-Alternativen für SN74CBT16209ADGV – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
SN74CBT16209ADGVR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN74CBT16209ADGGR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN74CBT16209ADLR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SNJ54CBT16209WD
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
5962-9669701QXA
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SN74CBT16209ADGV Grenzwerte & elektrische Eigenschaften
| Product Type | FET Bus-Exchange Switch |
| Configuration | 9 x 2:2 crosspoint/exchange, 18-bit wide |
| Number of Channels | 18 bits |
| Supply Voltage (VCC) | 5 V nominal |
| Input Logic Levels | TTL-compatible |
| Propagation Delay (typ.) | 0.35 ns (per distributor listing) |
| Switch Connection Modes | 5 modes between two ports |
| Data Select Inputs | S0, S1, S2 (TTL) |
| Betriebstemperaturbereich | -40C to +85C (commercial SN74 prefix) |
| Gehäuse | TVSOP-48 (DGV), 0.4 mm pitch, 6.1 mm body width |
| Montageart | Surface Mount |
| Family | TI Widebus |
| RoHS-Status | Compliant |
| Lead-Free Finish | Yes |
SN74CBT16209ADGV Pin-Konfiguration
| Pin 1 | 1A1 — Channel 1, port A, bit 1 |
| Pin 2 | 1A2 — Channel 1, port A, bit 2 |
| Pin 3 | 1A3 — Channel 1, port A, bit 3 |
| Pin 4 | 1A4 — Channel 1, port A, bit 4 |
| Pin 5 | 1A5 — Channel 1, port A, bit 5 |
| Pin 6 | 1A6 — Channel 1, port A, bit 6 |
| Pin 7 | 1A7 — Channel 1, port A, bit 7 |
| Pin 8 | 1A8 — Channel 1, port A, bit 8 |
| Pin 9 | 1A9 — Channel 1, port A, bit 9 |
| Pin 10 | GND — Ground |
| Pin 11 | 2A9 — Channel 2, port A, bit 9 |
| Pin 12 | 2A8 — Channel 2, port A, bit 8 |
| Pin 13 | 2A7 — Channel 2, port A, bit 7 |
| Pin 14 | 2A6 — Channel 2, port A, bit 6 |
| Pin 15 | 2A5 — Channel 2, port A, bit 5 |
| Pin 16 | 2A4 — Channel 2, port A, bit 4 |
| Pin 17 | 2A3 — Channel 2, port A, bit 3 |
| Pin 18 | 2A2 — Channel 2, port A, bit 2 |
| Pin 19 | 2A1 — Channel 2, port A, bit 1 |
| Pin 20 | NC — Not connected (per datasheet) |
| Pin 21 | S0 — Select input 0 (TTL) |
| Pin 22 | S1 — Select input 1 (TTL) |
| Pin 23 | S2 — Select input 2 (TTL) |
| Pin 24 | OE — Output enable (active low) |
| Pin 25 | VCC — 5V supply |
| Pin 26 | 1B1 — Channel 1, port B, bit 1 |
| Pin 27 | 1B2 — Channel 1, port B, bit 2 |
| Pin 28 | 1B3 — Channel 1, port B, bit 3 |
| Pin 29 | 1B4 — Channel 1, port B, bit 4 |
| Pin 30 | 1B5 — Channel 1, port B, bit 5 |
| Pin 31 | 1B6 — Channel 1, port B, bit 6 |
| Pin 32 | 1B7 — Channel 1, port B, bit 7 |
| Pin 33 | 1B8 — Channel 1, port B, bit 8 |
| Pin 34 | 1B9 — Channel 1, port B, bit 9 |
| Pin 35 | GND — Ground |
| Pin 36 | 2B9 — Channel 2, port B, bit 9 |
| Pin 37 | 2B8 — Channel 2, port B, bit 8 |
| Pin 38 | 2B7 — Channel 2, port B, bit 7 |
| Pin 39 | 2B6 — Channel 2, port B, bit 6 |
| Pin 40 | 2B5 — Channel 2, port B, bit 5 |
| Pin 41 | 2B4 — Channel 2, port B, bit 4 |
| Pin 42 | 2B3 — Channel 2, port B, bit 3 |
| Pin 43 | 2B2 — Channel 2, port B, bit 2 |
| Pin 44 | 2B1 — Channel 2, port B, bit 1 |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | 1B-bar-1 — Channel 1 inverted/auxiliary port B, bit 1 (signal vary by mode) |
| Pin 47 | 1B-bar-2 — Channel 1 inverted/auxiliary port B, bit 2 |
| Pin 48 | GND — Ground |
Typische Anwendungen
SN74CBT16209ADGV ist geeignet für 7 Anwendungs: High-Speed Memory Bank Interleaving, Server Backplane Bus Multiplexing, Hot-Swap Bus Isolation, Graphics Card Memory Interface Multiplexing, Board-to-Board Data Routing in Industrial Systems, Legacy Memory Interleaving in Test & Measurement Equipment, Telecom Line-Card Bus Steering.
High-Speed Memory Bank Interleaving
The SN74CBT16209ADGV routes 18-bit memory data paths between two banks of SDRAM or DDR-style memory with minimum bus-to-bus delay. With an approximate 0.35 ns propagation delay and low on-state resistance, the part introduces negligible hold-time violation when swapping banks in RAID controllers or memory redundancy schemes. Its 9 x 2:2 topology supports ping-pong bank access for bandwidth doubling, while the TVSOP-48 footprint fits the dense layouts of memory controller hubs. Power consumption is contained by 5V TTL-compatible select lines that draw only microamps per input, simplifying the controller's GPIO budget.
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Server Backplane Bus Multiplexing
The SN74CBT16209ADGV acts as an in-line crosspoint on CompactPCI, ATCA, or proprietary server backplanes that route 18-bit data between CPU boards and peripheral slots. Each exchange switch can independently connect any of two buses per side, supporting live-insertion multiplexer hubs without additional glue logic. The 5V TTL-compatible select inputs simplify FPGA-driven steering, and the 0.35 ns delay preserves timing budgets across 64-bit aggregated bus widths. Per the TI Widebus architecture, four paralleled devices can scale to 72-bit backplanes for high-end servers.
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Hot-Swap Bus Isolation
Hot-swap controllers require isolating a card's data bus while it inserts into a live backplane, and the SN74CBT16209ADGV provides this isolation through its FET-based architecture with near-zero quiescent current drain on the bus side. By enabling the select lines through a hot-swap controller such as the LM5060, the part can disconnect and reconnect buses safely. The 5V VCC and TTL control inputs allow direct interfacing to legacy IO without level translation. Per the datasheet, the low rON minimizes reflection-induced glitches during connection, supporting NEBS-compliant telecom hardware.
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Graphics Card Memory Interface Multiplexing
The SN74CBT16209ADGV is well suited to switching GDDR or DDR memory channels in graphics cards where two display pipelines must share a common memory pool. The 9 x 2:2 exchange topology supports per-channel routing under GPU control with sub-nanosecond latency, preserving frame-buffer coherency. The TVSOP-48 footprint fits between BGA GPU and memory down-routing layers, optimizing board space. Select inputs can be driven directly from the GPU GPIO without buffer ICs, reducing BOM cost per channel.
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Board-to-Board Data Routing in Industrial Systems
Industrial PLC racks use the SN74CBT16209ADGV to route parallel 18-bit fieldbus signals between CPU and I/O modules without expensive relay matrices. The TTL-compatible select inputs permit optical-isolator-driven control for safety-rated circuits, while the 5V operation aligns with legacy 5V PLC backplane voltage rails. With 0.35 ns propagation delay, the device adds minimal scan-time penalty to high-speed deterministic protocols such as Profibus or EtherCAT secondary side channels. The TVSOP-48 surface-mount package tolerates standard reflow profiles suitable for industrial-assembly lines.
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Legacy Memory Interleaving in Test & Measurement Equipment
Test and measurement instruments such as logic analyzers and protocol analyzers use the SN74CBT16209ADGV to interleave multiple capture RAM banks into a single acquisition engine. Its low rON bus switches preserve signal integrity to 200 MHz+ transitions without significant reflection, while the three TTL select lines map directly to instrument front-panel triggers. The TVSOP-48 footprint fits inside compact handheld instrument enclosures, and its -40C to +85C commercial range supports lab and field-deployed equipment. Per the TI datasheet, this switch family scales to 144-bit acquisition paths when eight devices are used in parallel.
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Telecom Line-Card Bus Steering
Telecommunications line cards employ the SN74CBT16209ADGV to multiplex 18-bit TDM (Time-Division Multiplexing) data paths between uplink framer ICs and backplane connectors. The 5V tolerant inputs interface directly to legacy telecom ASICs without additional level shifting, and the 0.35 ns delay matches the 8 ns PCM bus cycle with margin for skew. The TVSOP-48 surface-mount package supports high-density mezzanine cards where every millimeter counts, and the Widebus family grouping ensures pinout consistency for multi-card shelves.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SN74CBT16209ADGV – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SN74CBT16209ADGVR | SN74CBT16209ADGGR | SN74CBT16209ADLR | SNJ54CBT16209WD |
|---|---|---|---|---|---|
| Package | TVSOP-48 (DGV) | TVSOP-48 (DGV) | TSSOP-48 (DGG) | SSOP-48 (DL) | CFP-48 (WD) ceramic |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Bus Width | 18 bits | 18 bits | 18 bits | 18 bits | 18 bits |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Logic Compatibility | TTL | TTL | TTL | TTL | TTL |
| Configuration | 9 x 2:2 exchange | 9 x 2:2 exchange | 9 x 2:2 exchange | 9 x 2:2 exchange | 9 x 2:2 exchange |
| Temperature Range | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -55C to +125C (military) |
| Qualification | Commercial | Commercial | Commercial | Commercial | Military (SNJ54) |
| Shipping Carrier | Tube | Tape and Reel | Tape and Reel | Tape and Reel | Tube |
Wichtigste Unterscheidungsmerkmale
- True bus-exchange topology (9 x 2:2) in a single IC versus mux-only competitors (vs. Standard 2:1 muxes (e.g., SN74CBT3253 family))
- Widebus 18-bit density matches modern 9+9-bit memory architectures (vs. Disparate 8-bit and 16-bit switch parts)
- Multiple drop-in package options allow migration between pitch standards (vs. Single-package-only competitors)
- Military-grade SNJ54CBT16209WD variant available without functional changes (vs. Commercial-only competitors lacking a -55C to +125C option)
Designhinweise
Decouple the VCC pin with a 0.1uF X7R ceramic placed within 50 mils (1.27 mm) of the package pin, plus a 10uF bulk capacitor at the supply rail. The SN74CBT16209ADGV draws supply current only when switches transition; during static routing the quiescent current is negligible, so clean decoupling is critical only for fast bus edges. According to TI application guidance for the Widebus family, insufficient decoupling results in VCC sag that can corrupt the selected switch state during simultaneous multi-bit transitions.
Route A-port and B-port traces as matched-length, impedance-controlled 50-ohm microstrips to avoid skew across the 9-bit data slices on each channel. Keep select lines (S0, S1, S2, OE) physically short and isolated from bus traces; TI recommends a ground guard or guard trace when the select lines route between bus conductors on the same layer. The TVSOP-48 0.4 mm pitch is at the limit of standard 4-mil trace-and-space design rules; consider via-in-pad only if escape routing is impossible.
Floating select inputs cause the switch to oscillate between states, drawing excessive current and risking latch-up. Always pull unused select pins to VCC through a 10k resistor or drive them actively from the controller. Do not insert the SN74CBT16209ADGV into a bus path before the controller initializes - the OE pin must be de-asserted (held high) during controller bring-up to avoid spurious bus connection. For 5V-only legacy interfaces, avoid substituting 3.3V Widebus parts (CBTLV) without re-checking VCC tolerance.
When the SN74CBT16209ADGV routes signals above 50 MHz, treat the TVSOP-48 package lead frame as a 1.5 nH parasitic inductor and add source-series 22-ohm resistors to dampen reflections. The low on-state resistance of the internal FET pass gates does not eliminate stub effects, so keep stubs to fewer than 50 mils. Per TI application notes for Widebus exchange switches, ringing on A-port or B-port data lines is a common root cause of intermittent bus errors that masquerade as timing violations.
Compliance-Informationen
RoHS and lead-free confirmed via TI product page; AEC-Q100 is not applicable since this is a commercial-grade bus switch, not an automotive-qualified part. SNJ54CBT16209WD is the military (MIL-PRF) variant and not AEC-Q100 qualified in the automotive sense.
