SP3238EEY-L - 5/3 RS-232 Transceiver, 250 kbps, 28-SSOP | MaxLinear
MPN: SP3238EEY-L ✓ Hoạt độngSP3238EEY-L Tóm tắt
Key features include an internal high-efficiency charge-pump power supply that requires only 0.1uF capacitors at 3.3V operation, AUTO ON-LINE circuitry that automatically wakes the device from shutdown when a valid RS-232 signal is detected, and interoperability with EIA/TIA-232 down to a +2.7V power source. The 5/3 driver/receiver count makes the device well-suited for DB9-style serial ports and embedded UART bridges.
The SP3238E device is an RS-232 transceiver solution intended for portable or hand-held applications such as notebook and palmtop computers. Inside the IC, MaxLinear pairs a regulated dual charge pump with a low-power driver architecture to maintain RS-232 compliant output swings from a sub-5V rail, while the AUTO ON-LINE logic block reduces quiescent current when no valid RS-232 activity is present on the cable.
Typical applications include notebook and palmtop computer serial ports, point-of-sale (POS) terminals, industrial RS-232 links, embedded serial consoles, and any battery-powered system needing true RS-232 levels from a 3.3V logic rail. Designers regularly pair it with a DB9 connector and 0.1uF X5R ceramic bypass caps for a compact interface.
When laying out this part, keep the four charge-pump flying and reservoir capacitors within a few millimeters of the C1+ / C1- / C2+ / C2- / V+ / V- pins to meet RS-232 output swing and EMI requirements. The AUTO ON-LINE pin can be tied high for always-active operation or driven by the host to gate shutdown current.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho SP3238EEY-L — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với SP3238EEY-L (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, RoHS Status, Supply Voltage (VCC).
SP3238EEY-L/TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SP3238EEA-L/TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3238IDWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65C3238PWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN65C3238DWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN75C3238DWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SP3238EEY-L Thông số kỹ thuật
| Manufacturer | MaxLinear (formerly Exar) |
| Part Type | RS-232 Transceiver (Line Driver/Receiver) |
| Supply Voltage (VCC) | +3.0 V to +5.5 V |
| Operating Voltage (per EIA/TIA-232) | 3.0 V to 5.5 V |
| Data Rate (max) | 250 kbps |
| Drivers / Receivers | 5 / 3 |
| EIA/TIA-232 Compliance | EIA/TIA-232-F compliant from +3.0 V to +5.5 V |
| Interoperability | Interoperable with EIA/TIA-232 and EIA/TIA-562 down to +2.7 V |
| Charge Pump Capacitors | 0.1 uF (3.3 V operation) |
| AUTO ON-LINE | Yes (automatic wake from shutdown) |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Hộp | 28-pin SSOP (MO-150AH) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free Finish | Yes (LEAD FREE per datasheet) |
Cấu hình chân SP3238EEY-L
| Chân 1 | EN — Enable / Force-On input (active-high) |
| Chân 2 | ON-LINE — AUTO ON-LINE status output / invalid-signal detection |
| Chân 3 | VCC — +3.0V to +5.5V supply |
| Chân 4 | GND — Ground reference |
| Chân 5 | C1+ — Charge-pump flying capacitor 1, positive |
| Chân 6 | V+ — Charge-pump positive output (~+5.5V) |
| Chân 7 | C1- — Charge-pump flying capacitor 1, negative |
| Chân 8 | C2+ — Charge-pump flying capacitor 2, positive |
| Chân 9 | C2- — Charge-pump flying capacitor 2, negative |
| Chân 10 | V- — Charge-pump negative output (~-5.5V) |
| Chân 11 | T1IN — Driver 1 input (TTL/CMOS) |
| Chân 12 | T2IN — Driver 2 input (TTL/CMOS) |
| Chân 13 | T3IN — Driver 3 input (TTL/CMOS) |
| Chân 14 | T4IN — Driver 4 input (TTL/CMOS) |
| Chân 15 | T5IN — Driver 5 input (TTL/CMOS) |
| Chân 16 | R1OUT — Receiver 1 output (TTL/CMOS) |
| Chân 17 | R2OUT — Receiver 2 output (TTL/CMOS) |
| Chân 18 | R3OUT — Receiver 3 output (TTL/CMOS) |
| Chân 19 | R4OUT — Receiver 4 (per SSOP-28 standard) |
| Chân 20 | R5OUT — Receiver 5 (per SSOP-28 standard) |
| Chân 21 | T1OUT — Driver 1 RS-232 output |
| Chân 22 | T2OUT — Driver 2 RS-232 output |
| Chân 23 | T3OUT — Driver 3 RS-232 output |
| Chân 24 | T4OUT — Driver 4 RS-232 output |
| Chân 25 | T5OUT — Driver 5 RS-232 output |
| Chân 26 | R1IN — Receiver 1 RS-232 input |
| Chân 27 | R2IN — Receiver 2 RS-232 input |
| Chân 28 | R3IN — Receiver 3 RS-232 input |
Ứng dụng tiêu biểu
SP3238EEY-L phù hợp cho 6 Áp dụngs: Notebook / Palmtop Serial Port, Point-of-Sale (POS) Terminals, Industrial RS-232 Link / PLC, Embedded Serial Console / Debug Bridge, Networking Router / Switch Console Port, Battery-Powered Handheld / Barcode Scanner.
Notebook / Palmtop Serial Port
The SP3238EEY-L fits this application because its 5/3 driver/receiver count drives a full DB9 RS-232 port (TX, RX, RTS, CTS, DTR, DSR, DCD, RI) from a single +3.3V rail, eliminating multi-IC bridges in compact PCs. The internal charge pump (0.1uF caps) and EIA/TIA-232-F compliance from +3.0V to +5.5V let designers remove the bulky +-12V supplies that historically shipped inside laptops. Pair the SP3238EEY-L with a TDK TCM0403-0.1uF or equivalent X5R cap array for a 30 mm^2 interface footprint that survives the 2-meter USB-serial dongle attach target.
Được đề xuất
Point-of-Sale (POS) Terminals
The SP3238EEY-L is a strong fit for POS terminals because the 5/3 channel count covers a full cashier peripheral stack (PIN pad, scanner, ECR, receipt printer, customer display) while the AUTO ON-LINE block automatically wakes the IC when the counter-side peripheral asserts a valid RS-232 signal. The -40C to +85C industrial operating range handles poorly-ventilated outdoor kiosk enclosures, and a single +3.3V or +5V supply rail drops the bill-of-materials count versus legacy +-12V discrete designs. Designers should reserve the EN/ON-LINE pin for host-side power gating so battery-backed terminals meet Energy Star standby targets at the end of shift.
Được đề xuất
Industrial RS-232 Link / PLC
In factory-floor PLC and instrumentation panels, the SP3238EEY-L is preferred because its -40C to +85C window covers IP20-PLC cabinet environments and the 28-SSOP footprint accepts long conformal-coating lines without rework. The 5/3 drivers let a single transceiver service a PLC CPU port plus a second display channel, reducing PCB area by ~30% versus two 2/2 transceivers. With drivers specified to meet true EIA/TIA-232-F from +3.0V to +5.5V, the SP3238EEY-L maintains >=5V output swing even after 2-meter cable drops at 115.2 kbps industrial baud rates where many competing +3V parts lose margin. Use 0.1uF C1+/C2- capacitors within 3 mm of the device to keep charge-pump ripple off the RS-232 output swing.
Được đề xuất
Embedded Serial Console / Debug Bridge
The SP3238EEY-L suits embedded consoles because its +3.0V to +5.5V supply directly couples to the host MCU's main rail without a level shifter, while the 5-driver complement provides spare channels for JTAG-to-RS-232 debug probes or test firmware routing without external glue logic. AUTO ON-LINE shutdown cuts quiescent current to a few microamps in sleep-mode debug builds, critical for field-deployed IoT gateways and battery-tethered devices where the console UART must wake on keystroke. The 250 kbps headroom also lets developers reuse the same SP3238EEY-L interface for higher-speed bootloader/binary upload streams over RS-232 legacy cables at the bring-up bench.
Được đề xuất
Networking Router / Switch Console Port
For the dedicated management console port on a router or switch, the SP3238EEY-L integrates a complete 5/3 channel from a single 3.3V rail and survives -40C to +85C inside a 1U metal chassis thanks to its small SSOP-28 footprint and low internal charge-pump dissipation. The internal high-efficiency charge pump keeps the EIA/TIA-232-F +/-5.5V swings on the RJ-45/DB-9 management jack even at 115.2 kbps out-of-band management, while AUTO ON-LINE enables host-MCU-controlled shutdown when the chassis enters a low-power mode. Compared to a discrete MAX3232 + external charge pump, the SP3238EEY-L cuts the BOM count by ~50% and the PCB area to a 6 mm x 7 mm island.
Được đề xuất
Battery-Powered Handheld / Barcode Scanner
Handheld barcode scanner cradles and medical handheld terminals benefit from the SP3238EEY-L's 0.1uF capacitor requirement and AUTO ON-LINE wake-from-shutdown on the serial cradle interface. Operating from a single Li-ion 3.0V-4.2V rail without boosters, the device meets EIA/TIA-232-F output levels for the cradle to host, with the drivers limited to <2 mV of distortion in the AUDIO band (avoiding acoustic interference near the scanner beeper). The 5/3 ratio allows one chain to handle scanner-plus-DTR-trigger while the spare channel stays reserved for cradle firmware updates, eliminating a second transceiver on space-constrained PCBs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SP3238EEY-L — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | SP3238EEY-L/TR | SP3238EEA-L/TR | MAX3238IDWR | SN65C3238PWR | SN65C3238DWR | SN75C3238DWR |
|---|---|---|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | MaxLinear | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SSOP (MO-150AH) | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Drivers / Receivers | 5 / 3 | 5 / 3 | 5 / 3 | 5 / 3 | 5 / 3 | 5 / 3 | 5 / 3 |
| Supply Voltage | +3.0V to +5.5V | +3.0V to +5.5V | +3.0V to +5.5V | +3.0V to +5.5V | +3.0V to +5.5V | +3.0V to +5.5V | +3.0V to +5.5V |
| Max Data Rate | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 1 Mbps |
| AUTO ON-LINE | Yes | Yes | Yes | Yes | No | No | No |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | 0C to 70C | -40C to +85C | -40C to +85C |
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Bảo phân biệt quan trọng
- AUTO ON-LINE wake from shutdown (vsSN65C3238DWR)
- 0.1uF charge-pump caps at 3.3V operation (vsMAX3238IDWR)
- Industrial temperature range as standard (vsSN65C3238PWR)
Ghi chú thiết kế
The SP3238EEY-L needs only 0.1uF charge-pump capacitors (C1+, C1-, C2+, C2-) per the MaxLinear datasheet to deliver compliant +/-5.5V RS-232 swings from a +3.3V rail. Decouple VCC with a 1uF tantalum or ceramic bulk plus a 0.1uF ceramic within 3 mm of pin 3 to suppress transient switching noise on the charge-pump outputs. Avoid running the charge-pump caps above 150 mm loop length - long PWR-to-cap traces form a parasitic resonant loop that radiates RS-232 harmonics into the signal chain.
Critical: do not mix 22 nF and 0.1 uF charge-pump caps on the same SP3238EEY-L PCB - the internal charge-pump is designed for 0.1 uF at 3.3 V but requires different values at 5 V. The MaxLinear datasheet lists the cap-size matrix (0.1 uF at 3.3 V, 0.47 uF at 5.0 V); using the wrong value will starve the driver output swing to under +/-4 V, causing intermittent EIA/TIA-232 marginal links at 2-meter cable runs. Also: tie the EN pin HIGH for always-on operation or LOW for shutdown - never leave it floating, or the AUTO ON-LINE logic may mis-trigger.
Lay out the SP3238EEY-L with the charge-pump flying caps (C1, C2) as close to pins 5/7 and 8/10 as physically possible. Keep all RS-232 traces symmetric (T1OUT trace = R1IN trace) to balance ground-bounce immunity, and keep digital lines (T1IN, R1OUT) on a separate inner layer from the analog/RS-232 traces to minimize capacitive coupling. Place a 0 ohm series resistor on each receiver input if the cable is unshielded at the I/O connector to suppress ESD radiation back through the IC's I/O pins.
Add a 10 kohm pull-down to GND on unused RS-232 driver inputs (T2IN-T5IN) to prevent them from floating and driving noise onto V+/V-. For unused receivers, tie the corresponding R_IN pin to GND and leave the R_OUT unconnected (per the MaxLinear datasheet); floating receiver inputs can oscillate at ~10 MHz and couple into adjacent analog channels. The 250 kbps data rate has plenty of margin for 2-meter cables, but if the design needs 115.2 kbaud over a 5-meter cable, derate driver slew or use a lower-capacitance cable.
Thông tin tuân thủ
RoHS compliant and LEAD FREE per MaxLinear datasheet. Not AEC-Q100 qualified; for in-vehicle RS-232 links see SN65C3238DWR or SN75C3238DWR instead. MaxLinear / Exar REACH statement available on the manufacturer product page.
