SN74LV595APWR - 8-Bit Shift Register w/ 3-State Outputs | TI
Référence : SN74LV595APWR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.66 | $0,66 |
| 10 | $0.55 | $5,50 |
| 100 | $0.42 | $42,00 |
| 500 | $0.36 | $180,00 |
| 1 000 | $0.3 | $300,00 |
| 3 000 | $0.25 | $750,00 |
SN74LV595APWR Présentation
An 8-bit shift register is a sequential logic block that converts a serial bit stream into a parallel byte, freeing microcontroller GPIO when driving multi-line peripherals such as LED matrices, 7-segment displays, or relay banks. The SN74LV595A extends the basic shift-register concept by adding a transparent latch and high-current 3-state outputs, allowing a single SCK/RCK pair to update one or more cascaded banks with deterministic timing and bus-isolation.
Key features include separate shift-clock (SRCLK) and storage-clock (RCLK) inputs for glitch-free parallel updates, a direct overriding SRCLR\ that clears the shift register independent of the latch, cascadable serial data output (Q7') for daisy-chaining without external glue logic, and ESD protection that exceeds the JESD22-A114 Human-Body Model and the JESD22-A115 Machine Model thresholds. The wide 2 V to 5.5 V supply range makes it interchangeable between 3.3 V and 5 V logic domains without level shifters.
The architecture combines a Serial-In Parallel-Out (SIPO) shift register, a parallel D-type storage register, and eight 3-state output buffers in one die. The two-stage pipeline lets the application software load a full byte at SCK speed and then commit all bits to the outputs in a single RCLK edge, eliminating visible intermediate states on the LEDs or relays during refresh cycles.
Typical applications include LED matrix and 7-segment display drivers, multi-channel relay or solenoid control, I/O expansion for low-pin-count microcontrollers, and serial-to-parallel fan-out for CPLD/FPGA designs. The cascadable Q7' output simplifies designs that need more than 8 outputs without consuming additional GPIO pins.
When designing with this part, place a 0.1 uF decoupling capacitor within 5 mm of the VCC pin and verify that the SCK/RCK traces are short to avoid ground-bounce triggering the SRCLR\ input. The 3-state OE\ pin must be driven HIGH for normal operation and can be tied to GND permanently if bus isolation is not required.
Alternatives de remplacement direct pour SN74LV595APWR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
SN74LV595APWT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN74LV595AQPWRQ1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SN74LV595APWRG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
74LV595PW,118
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC74LV595ADTR2G
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SN74LV595APWR Valeurs maximales et caractéristiques électriques
| Fonction | 8-bit serial-in/parallel-out shift register with 3-state output register |
| Logic Family | LV-A (Low-Voltage CMOS, A revision) |
| Number of Bits | 8 |
| Number of Elements | 1 |
| Type de sortie | 3-State |
| Supply Voltage (VCC) | 2 V to 5.5 V |
| Plage de tension d'entrée | 0 V to 5.5 V |
| Propagation Delay (tpd) | 6 ns typical at 5 V, 8 ns at 3.3 V |
| Output Current (IOH/IOL) | ±16 mA |
| Température de fonctionnement | -40C to +125C |
| Storage Register | Yes, separate RCLK clocked |
| Cascadable Serial Output (Q7') | Yes |
| Asynchronous Clear (SRCLR) | Yes, active-low, direct override |
| Output Enable (OE) | Yes, active-low |
| Boîtier | TSSOP-16 (PW) |
| Type de montage | Surface Mount |
| Niveau MSL | 1 (unlimited) |
| ESD Protection | Exceeds JESD22-A114 HBM / JESD22-A115 MM (per TI datasheet) |
| Latch-Up Performance | Exceeds 250 mA per JESD17 |
| Lead-Free / RoHS | Yes, RoHS compliant |
Configuration des broches de SN74LV595APWR
| Broche 1 | Qa — Parallel output A (3-state) |
| Broche 2 | Qb — Parallel output B (3-state) |
| Broche 3 | Qc — Parallel output C (3-state) |
| Broche 4 | Qd — Parallel output D (3-state) |
| Broche 5 | Qe — Parallel output E (3-state) |
| Broche 6 | Qf — Parallel output F (3-state) |
| Broche 7 | Qg — Parallel output G (3-state) |
| Broche 8 | GND — Ground |
| Broche 9 | Q7' — Serial data output (cascade to next SR's SER) |
| Broche 10 | SRCLR\ — Shift register clear (active-low, asynchronous) |
| Broche 11 | SRCLK — Shift register clock (rising edge clocks SER into Qa) |
| Broche 12 | RCLK — Storage register clock (rising edge transfers shift reg to storage reg) |
| Broche 13 | OE\ — Output enable (active-low, HIGH = outputs high-Z) |
| Broche 14 | SER — Serial data input |
| Broche 15 | Qh — Parallel output H (3-state) |
| Broche 16 | VCC — Supply voltage (2 V to 5.5 V) |
Applications typiques
SN74LV595APWR convient pour 7 applications: LED Matrix Display Driver, Microcontroller I/O Expansion, Relay and Solenoid Driver Array, FPGA / CPLD Fan-Out Buffer, Audio Front-Panel Indicator Driver, Industrial Sensor Multiplexer, SPI-to-Parallel LCD Interface.
LED Matrix Display Driver
The SN74LV595APWR drives LED matrices and 7-segment displays efficiently because of its ±16 mA source/sink current, cascadable Q7' output, and 8-bit parallel output register that commits all bits in a single RCLK edge - eliminating visible intermediate states during multiplexed refresh. In a typical 8x8 LED matrix, two SN74LV595APWRs cascade to control row data while the host drives row select via discrete transistors, freeing the MCU GPIO. The 2 V to 5.5 V VCC range matches both 3.3 V and 5 V LED panels. According to TI datasheet, the LV-A family's low static current makes it suitable for always-on scoreboard and signage designs where hundreds of cascaded shift registers share a single SCK/RCLK pair.
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Microcontroller I/O Expansion
The SN74LV595APWR expands 3 MCU GPIO pins into 8 outputs, making it ideal for low-pin-count microcontrollers that need to drive relays, sensors, or LCD backlights. According to TI datasheet, the separate SRCLK and RCLK clocks allow software to assemble a full byte off-line and present it to the outputs atomically, avoiding partial-update glitches on critical control signals. The 3-state OE\ pin doubles as a hardware enable for fail-safe output disable during MCU reset, critical for industrial safety applications. Operating from 2 V to 5.5 V lets the same board design work with both 3.3 V and 5 V MCU families without rework.
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Relay and Solenoid Driver Array
The SN74LV595APWR drives multiple low-power relays and solenoids directly from its ±16 mA outputs when paired with MOSFET drivers or ULN2803 sink arrays. The 3-state outputs allow parallel connection to a shared bus for multiplexed driver topologies. According to TI datasheet, the -40C to +125C operating range and JESD17 latch-up rating make it suitable for industrial relay racks and HVAC controls. The direct-overriding SRCLR\ input lets the system force all outputs to a safe state without clocking in data, an important feature for emergency-shutdown and motor-control circuits.
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FPGA / CPLD Fan-Out Buffer
The SN74LV595APWR serves as a serial-to-parallel fan-out buffer for FPGAs and CPLDs that have insufficient dedicated output pins. According to TI datasheet, the cascadable Q7' output lets one SCK line drive arbitrarily many SN74LV595APWRs in a chain, freeing the FPGA for higher-speed logic. The 6 ns tpd at 5 V typical is fast enough for SPI-driven displays running at 100 MHz SCK in burst mode. LV-A logic is widely used in FPGA development boards and instrumentation daughter cards where 3.3 V is the dominant supply.
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Audio Front-Panel Indicator Driver
The SN74LV595APWR drives audio front-panel VU meters, peak-LED ladders, and status indicators in mixing consoles and amplifiers. According to TI datasheet, the LV-A logic family's low noise floor (no internal oscillator, no switching artifacts on VCC) prevents audible interference with adjacent analog audio circuits. The 3-state outputs allow multi-source LED sharing via a common indicator bus, and the 2 V to 5.5 V VCC range supports both 3.3 V DSP-front and 5 V legacy analog-front indicator chains in the same product family.
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Industrial Sensor Multiplexer
The SN74LV595APWR enables multi-channel sensor multiplexing in industrial PLC and SCADA applications by providing 8 individually controlled 3-state outputs that route sensor power, chip-select, or enable signals. According to TI datasheet, the OE\ pin's fast enable time (typ. 5 ns at 5 V) is fast enough for sub-microsecond channel switching in time-multiplexed measurement loops. The -40C to +125C industrial temperature rating and JESD17 latch-up performance exceed 250 mA, ensuring reliable operation near noisy motor drives and relay coils.
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SPI-to-Parallel LCD Interface
The SN74LV595APWR converts SPI serial data from a small MCU into parallel data/control signals for character LCDs or graphical OLEDs without burning 11 MCU pins. According to TI datasheet, the cascadable Q7' output allows a single SPI port to drive both LCD data lines and a backlight controller on a second shift register. The 3-state outputs isolate the LCD bus when not actively writing, allowing other devices to share the same parallel bus. The LV-A logic operates down to 2 V, supporting low-voltage portable LCDs without separate level shifting.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SN74LV595APWR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SN74LV595APWT | SN74LV595AQPWRQ1 | SN74LV595APWRG4 | 74LV595PW,118 | MC74LV595ADTR2G |
|---|---|---|---|---|---|---|
| Package | TSSOP-16 (PW) | TSSOP-16 (PW) - same | TSSOP-16 (PW) - same | TSSOP-16 (PW) - same | TSSOP-16 (PW) - same | TSSOP-16 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Nexperia | onsemi |
| Bits / Outputs | 8-bit / 8 outputs | 8-bit / 8 outputs | 8-bit / 8 outputs | 8-bit / 8 outputs | 8-bit / 8 outputs | 8-bit / 8 outputs |
| VCC Range | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V | 2 V to 5.5 V |
| AEC-Q100 Qualified | No | No | Yes (Grade 1) | No | No | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Principaux différenciateurs
- Wide 2 V to 5.5 V VCC range (vs SN74HC595N (2 V to 6 V HC family))
- Cascadable Q7' output for multi-bank chains (vs SN74AHC595PW (same TSSOP-16 footprint))
- Automotive-grade variant available in same footprint (vs SN74LV595APWR vs SN74LV595AQPWRQ1)
Notes de conception
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of the VCC pin (pin 16), with a 1 uF bulk capacitor nearby for high-current transients. According to TI SN74LV595A datasheet, the LV-A family draws up to ~50 mA dynamic current during clock transitions; insufficient decoupling can cause VCC droop that shifts the SRCLK threshold and corrupts incoming serial data. Use X7R or X5R ceramic dielectrics and keep the return path directly to GND (pin 8) without sharing vias with signal traces.
Keep SRCLK, RCLK, SER, SRCLR\ and OE\ traces short and routed away from high-frequency switching signals. According to TI datasheet, the LV-A family has TTL-compatible LVCMOS thresholds (VIH = 2.0 V min at 5.5 V VCC) but rise/fall times below 5 ns can produce ground bounce near pin 8. Series-termination resistors (33-47 ohm) on SRCLK and RCLK dampen reflections in cascaded chains longer than 50 mm. Always clock OE\ HIGH during MCU reset to tri-state the outputs and prevent bus contention.
Do not leave OE\ floating - it must be tied LOW for normal output drive or HIGH for high-Z. According to TI datasheet, the SRCLR\ pin is asynchronous and direct-overriding; a momentary noise pulse during power-up can clear the shift register unexpectedly if SRCLR\ is not pulled HIGH through a 10 kohm resistor. When cascading multiple SN74LV595APWRs, ensure that the Q7' serial output of stage N connects to the SER input of stage N+1 with no stubs, and that all stages share a common RCLK edge to avoid skew between cascaded banks.
Place the SN74LV595APWR close to the MCU's SPI pins to minimize the SCK trace length. According to TI datasheet, the TSSOP-16 (PW) package has a small thermal pad-less footprint that simplifies PCB layout but requires a copper pour under and around the IC to spread heat when driving 16 mA on all 8 outputs simultaneously (~128 mA total). Provide at least 1 square inch of copper pour for thermal relief, and consider spreading the ground return around the package perimeter to keep the GND pin return impedance low.
Informations de conformité
RoHS/REACH compliant per TI product page; standard variant is not AEC-Q100 qualified - choose SN74LV595AQPWRQ1 for automotive. JESD22-A114 HBM and JESD22-A115 MM ESD ratings exceed industry thresholds per TI datasheet.
