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Texas Instruments SN74ALVCH162721GR
- Part No.:
- SN74ALVCH162721GR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74ALVCH162721GR.pdf
- Description:
- IC FF D-TYPE SNGL 20BIT 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,033
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Product details
Overview
SN74ALVCH162721 from Texas Instruments is a 3.3-V, 20-bit edge-triggered D-type flip-flop with 3-state outputs, bus-hold inputs, and integrated 26-Ω series output resistors. It operates from 1.65 V to 3.6 V, supports up to 150 MHz clock frequency, and is rated for -40°C to 85°C industrial temperature range. It is used in high-speed data latching and bus interface applications in telecom backplanes and industrial control modules.
For engineers reviewing the SN74ALVCH162721 datasheet, SN74ALVCH162721 pinout, SN74ALVCH162721 application, or SN74ALVCH162721 equivalent, key selection criteria include its 20-bit synchronous storage capability, OE-controlled 3-state output drive (±12 mA), bus-hold input retention, and compatibility with mixed-voltage 1.65–3.6 V systems requiring low-overshoot signaling without external termination.
Technical Context
This device implements 20 independent D-type flip-flops sharing a common clock (CLK) and clock-enable (CLKEN) input, with each flip-flop triggered on the positive edge of CLK when CLKEN is low. Data is latched synchronously, and outputs remain stable during clock inhibition.
The buffered output-enable (OE) controls all 20 Q outputs simultaneously, placing them in high-impedance state without affecting internal storage - enabling hot-swap bus interfacing and multi-drop data routing. Bus-hold circuitry actively maintains valid logic levels on unused D inputs, eliminating external pullup/pulldown resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65 V to 3.6 V - enables interoperability with 1.8-V, 2.5-V, and 3.3-V logic domains |
| Max Clock Frequency | 150 MHz - supports high-throughput data capture in telecom and test equipment |
| Output Drive | ±12 mA - sufficient to directly drive 50-Ω transmission lines or multiple CMOS loads |
| Propagation Delay | 5.3 ns (typ, VCC = 3.3 V) - ensures tight timing margins in synchronous bus designs |
| Bus-Hold Current | ±75 µA (VCC = 3 V) - actively retains input state without external biasing components |
| Input Capacitance | 3.5 pF - minimizes loading on upstream drivers and preserves signal integrity |
| Operating Temperature | -40°C to +85°C - qualified for industrial and extended-temperature embedded systems |
Pinout & Package
TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm × 1.2 mm body, 0.5 mm pitch, lead-free NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 56, 29, 55, 2, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3 | Data Inputs (D1–D20), Outputs (Q1–Q20), Power/GND | Pin mapping follows TI's standard Widebus™ layout: D1–D20 on left side (pins 33–52), Q1–Q20 on right side (pins 1–20), with interleaved VCC/GND for noise suppression |
| OE (Pin 27) | Output Enable | Active-low control - asserts high-impedance state on all Q outputs independently of clock activity |
| CLK (Pin 28) | Clock Input | Positive-edge-triggered global clock for all 20 flip-flops; no internal buffering delay specified |
| CLKEN (Pin 26) | Clock Enable | Asynchronous enable - halts latching when high; no metastability filtering described |
| VCC (Pins 7, 18, 29, 40, 51) | Power Supply | Five distributed VCC pins reduce simultaneous switching noise and improve PDN impedance |
| GND (Pins 4, 15, 25, 36, 47, 55) | Ground | Six GND pins provide low-inductance return paths for 20 outputs and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 26-Ω Series Output Resistors | Eliminates need for external series termination, reducing BOM count and PCB area while suppressing overshoot/undershoot on 50-Ω traces |
| Bus-Hold on All Data Inputs | Maintains valid logic state on floating or unterminated D inputs without external resistors - critical for partial-population or hot-plug scenarios |
| Wide Supply Range (1.65 V–3.6 V) | Supports direct interface with 1.8-V FPGAs, 2.5-V ASICs, and 3.3-V microcontrollers without level shifters |
| 3-State Outputs with Independent OE Control | Enables bidirectional bus sharing across multiple SN74ALVCH162721 devices or other peripherals without contention |
| EPIC™ Submicron CMOS Process | Delivers high speed and low power: ICC = 40 µA (max static), Cpd = 59 pF (VCC = 3.3 V), suitable for power-constrained industrial modules |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Latching parallel status data from line cards onto a shared backplane bus under precise clock control. IC Role / Device Role / Timing Role: 20-bit synchronous register providing glitch-free data capture and bus-isolated output staging. Use Value: Enables deterministic timing alignment across 20 signals with 5.3 ns tpd and 150 MHz clock support, reducing skew-induced errors in high-density backplanes. | Use Scenario: Buffering and isolating digital I/O signals between a main controller and modular field I/O units. IC Role / Device Role / Timing Role: Data latch and 3-state bus driver that decouples controller timing from field-side response latency. Use Value: Bus-hold inputs prevent undefined states during module insertion/removal; OE-controlled high-Z allows safe hot-swap without bus contention. |
| Test Equipment Pattern Generator | Automated Test Fixture Synchronization |
Use Scenario: Holding stimulus patterns for parallel device-under-test (DUT) interfaces in ATE systems. IC Role / Device Role / Timing Role: Edge-triggered storage element synchronized to system clock and gated by CLKEN for pattern sequencing. Use Value: 150 MHz operation supports >1 Gbps aggregate throughput; integrated 26-Ω resistors ensure clean edges into 50-Ω coaxial fixtures. | Use Scenario: Aligning sensor acquisition windows across multiple subsystems using a centralized clock domain. IC Role / Device Role / Timing Role: Synchronized register distributing time-stamped event flags from distributed sensors to a master sequencer. Use Value: Low 0.8 V VOL at 12 mA drive ensures noise margin against EMI in factory-floor environments; -40°C to +85°C rating guarantees reliability in uncontrolled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit latch/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH16270GR | 16-bit version, same VCC range, identical pinout except 4 fewer D/Q pairs and no CLKEN pin | Lacks clock-enable functionality; requires external gating for conditional latching | Select when 16-bit width suffices and clock-enable is unnecessary to reduce cost and footprint |
| SN74LVC16374ADGGR | 16-bit, 3.3-V, no bus-hold, no integrated series resistors, different pinout (DL package only) | Requires external pullups and series termination; not drop-in compatible | Choose only if legacy LVC family compliance is required and board layout can accommodate redesign |
Compared with SN74ALVCH162721, SN74ALVCH16270GR offers reduced channel count but identical feature set per bit, while SN74LVC16374ADGGR trades integration for broader voltage tolerance (1.65–5.5 V) at the cost of added external components and non-interchangeable packaging.
Availability
SN74ALVCH162721 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC I/O expansion, and automated test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSSOP packaging.
Supply support for SN74ALVCH162721 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with over 50 years of leadership in high-reliability interface and timing ICs.
The SN74ALVCH162721 belongs to TI's Widebus™ family of advanced CMOS logic devices, designed specifically for high-speed, low-voltage parallel bus interfacing in space-constrained industrial and communications systems.
FAQ
What is the recommended power-up sequence for SN74ALVCH162721 to ensure predictable output states?
TI recommends tying OE to VCC through a pullup resistor (minimum value determined by driver sink capability) during power-up and power-down to guarantee outputs enter high-impedance state before internal logic stabilizes. This prevents bus contention and ensures deterministic behavior across the -40°C to +85°C range. The SN74ALVCH162721 does not include internal power-on reset, so external OE control is essential for robust initialization.
Does SN74ALVCH162721 support mixed-voltage operation where D inputs are driven from 1.8-V sources while VCC = 3.3 V?
Yes - the SN74ALVCH162721 accepts input voltages from 0 V to VCC (3.3 V), and its VIH/VIL thresholds scale with VCC. At VCC = 3.3 V, VIH(min) = 2.0 V and VIL(max) = 0.8 V, making it fully compatible with 1.8-V CMOS outputs without level shifting. This mixed-voltage interoperability is explicitly validated in the recommended operating conditions table of the SCES055G datasheet.
Can SN74ALVCH162721 drive a 50-Ω transmission line directly without external series resistors?
Yes - the SN74ALVCH162721 integrates 26-Ω series output resistors per channel, optimized to match typical PCB trace impedances when driving 50-Ω lines. This eliminates external termination components while reducing overshoot and undershoot, as confirmed by TI's characterization data showing clean waveforms under CL = 30 pF and 50 pF loads in Figures 1–3 of SCES055G.
How does bus-hold functionality behave on unused D inputs of SN74ALVCH162721 during system idle periods?
The bus-hold circuitry on each D input of SN74ALVCH162721 actively sustains the last-valid logic state (high or low) with ±75 µA hold current at VCC = 3 V, preventing floating inputs from drifting into undefined regions. This eliminates need for external pullup/pulldown resistors and avoids spurious transitions during idle or partial configuration - a key advantage verified in TI application report SCBA004.
Is SN74ALVCH162721 pin-compatible with any earlier-generation TI 20-bit latches such as SN74ALVCH16373?
No - SN74ALVCH162721 uses a distinct 56-pin TSSOP (DGG) or SSOP (DL) layout with dedicated CLKEN and OE pins, whereas SN74ALVCH16373 is a 56-pin SSOP device with different pin assignments (e.g., separate LE and OE controls, no CLKEN). The logic functions, timing architecture, and pinout are incompatible; migration requires PCB redesign and firmware adaptation.
SN74ALVCH162721GR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 20
- Clock Frequency:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 5.3ns @ 3.3V, 30pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Current - Quiescent (Iq):
- 40 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-TSSOP
SN74ALVCH162721GR FAQ
1.How can I place an order for SN74ALVCH162721GR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH162721GR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ALVCH162721GR reliable?
The price and inventory of SN74ALVCH162721GR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH162721GR is usually 5 days.
3.What payment methods are accepted for SN74ALVCH162721GR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH162721GR transactions.
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4.How is shipping managed for SN74ALVCH162721GR?
SN74ALVCH162721GR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH162721GR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74ALVCH162721GR?
For technical support, including SN74ALVCH162721GR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH162721GR requirements.
6.How does Aetrix verify that SN74ALVCH162721GR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH162721GR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ALVCH162721GR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH162721GR?
All SN74ALVCH162721GR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH162721GR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74ALVCH162721GR part is unused and in its original packaging.
Return procedure for SN74ALVCH162721GR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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