TLV3502 - 4.5ns Dual Rail-to-Rail Comparator | Texas Instruments
MPN： TLV3502 ✓ 啟用中TLV3502 概覽
A comparator is an analog IC that compares two input voltages and outputs a digital signal indicating which is higher. Within the signal chain, comparators bridge analog sensing and digital processing, converting analog thresholds into logic levels. The TLV3502 belongs to the high-speed comparator family, a subset of linear comparators in the broader analog-to-digital interface IC hierarchy.
Key features include the 4.5ns propagation delay, 6mV internal hysteresis for noise immunity, and an input common-mode range extending 0.2V beyond the supply rails. The push-pull CMOS output stage directly drives CMOS or TTL logic without an external pull-up resistor. CMOS inputs provide picoampere-level input bias current, ideal for high-impedance sources. Note that the dual TLV3502 has no shutdown function; shutdown is available only on the single-channel TLV3501.
Architecturally, the CMOS process delivers low power and high input impedance. The rail-to-rail input stage senses signals near either supply rail, critical in low-voltage designs, while the output sources and sinks current to drive capacitive loads. The device is specified from -40C to +125C.
Typical applications include zero-crossing detectors, window comparators, level shifters, high-speed signal conditioning in test and measurement equipment, PWM circuits, and high-frequency oscillators. The 3.2mA supply current also benefits battery-powered portable instruments.
For reliable design, bypass the supply with a 0.1uF capacitor close to the VCC pin and respect the input common-mode range to avoid output errors.
直接替換替代品，適用於 TLV3502 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
TLV3502AIDR
✅ 直接替換📋 參考替代品（不在目錄中）
TLV3502AIDCNT
✅ 直接替換📋 參考替代品（不在目錄中）
TLV3502AIDCNR
✅ 直接替換📋 參考替代品（不在目錄中）
TLV3502-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TLV3502 最大額定值與電氣特性
| 通道數 | 2 (dual) |
| Propagation Delay | 4.5 ns |
| Supply Voltage Range | 2.7 V to 5.5 V |
| 供應電流 | 3.2 mA |
| Input Hysteresis | 6 mV (internal) |
| Input Common-Mode Range | Extends 0.2 V beyond rails |
| 輸出類型 | CMOS, Push-Pull, Rail-to-Rail (CMOS/TTL compatible) |
| Input Bias Current | picoampere-level (CMOS input) |
| 工作溫度 | -40C to +125C |
| Packages | 8-SOIC (D), 8-SOT-23 (DCN) |
| 安裝類型 | Surface Mount |
| Logic Compatibility | CMOS, TTL |
| Shutdown Function | No (TLV3501 only) |
| RoHS 狀態 | Compliant |
| Family | TLV350x high-speed comparator |
TLV3502 腳位配置
| 腳位 1 | OUT A — Channel A output (push-pull CMOS) |
| 腳位 2 | IN A- — Channel A inverting input |
| 腳位 3 | IN A+ — Channel A non-inverting input |
| 腳位 4 | V- (GND) — Negative supply / ground |
| 腳位 5 | IN B- — Channel B inverting input |
| 腳位 6 | IN B+ — Channel B non-inverting input |
| 腳位 7 | OUT B — Channel B output (push-pull CMOS) |
| 腳位 8 | VCC — Positive supply, 2.7 V to 5.5 V |
典型應用
TLV3502 適用於 6 應用s: Zero-Crossing Detection, High-Speed Signal Conditioning - Test & Measurement, Window Comparators, Level Shifting and Logic Translation, PWM and Oscillator Circuits, Portable and Battery-Powered Instruments.
Zero-Crossing Detection
The TLV3502's 4.5ns propagation delay and rail-to-rail input make it ideal for AC line and signal zero-crossing detection where timing accuracy matters. The 6mV internal hysteresis suppresses chatter from noise near the crossing point, and the input common-mode range extending 0.2V beyond the rails allows sensing small signals near ground. In a typical circuit, one input is grounded and the AC signal drives the other; the push-pull CMOS output directly clocks a microcontroller timer without an external pull-up, yielding sub-10ns timing uncertainty at 3.3V or 5V logic.
推薦
High-Speed Signal Conditioning - Test & Measurement
In oscilloscope front ends, frequency counters, and pulse analyzers, the TLV3502 converts fast analog waveforms to logic levels with only 4.5ns delay and low channel-to-channel skew. The dual channels enable differential or window comparisons in one 8-pin package, reducing BOM and board area. Supply current is 3.2mA per channel, modest for the speed class, easing portable instrument power budgets. The rail-to-rail output cleanly drives CMOS/TTL logic at up to 5.5V, and the CMOS picoampere input bias preserves accuracy with high-impedance probes or dividers.
推薦
Window Comparators
The dual channels of the TLV3502 naturally implement window comparators for over/under-voltage monitoring of supply rails, sensor outputs, or battery packs. One channel flags undervoltage while the other flags overvoltage; OR-ing the outputs yields a single fault signal. The 2.7V to 5.5V supply range covers 3.3V and 5V monitoring systems, and the 6mV hysteresis provides clean switching near thresholds. The push-pull output eliminates pull-up resistors required by open-collector comparators like the LM393, saving components and improving rise-time consistency in digital monitoring buses.
推薦
Level Shifting and Logic Translation
Because the TLV3502 input common-mode range extends 0.2V beyond the supply rails and its push-pull output swings fully rail-to-rail, it performs clean analog level translation between signal domains. A small signal referenced to a lower domain can be compared against a threshold in a 3.3V or 5V system, producing a valid CMOS/TTL logic level at up to 5.5V. The 4.5ns delay adds negligible latency compared with dedicated level-shifter ICs, and CMOS picoampere input bias keeps source loading minimal for high-impedance analog sources.
推薦
PWM and Oscillator Circuits
The TLV3502 builds high-frequency relaxation oscillators and PWM comparators where propagation delay sets the achievable frequency. With 4.5ns delay, oscillator frequencies in the tens of MHz are practical, far beyond the reach of general-purpose comparators like the LM393. The dual channels support an oscillator plus a duty-cycle comparator on one die, improving timing correlation between sections. The push-pull output drives logic directly, and the 6mV hysteresis stabilizes oscillation amplitude against supply noise in 3.3V and 5V systems.
推薦
Portable and Battery-Powered Instruments
At 3.2mA per channel from a 2.7V to 5.5V supply, the TLV3502 suits battery-powered handheld instruments, sensors, and data loggers that still need fast threshold decisions. The 8-SOT-23 microsize package minimizes board area in space-constrained wearables and portable meters. Rail-to-rail inputs sense battery-derived signals near ground or the positive rail as the pack discharges, maintaining accuracy across the full battery voltage range. While the dual TLV3502 lacks shutdown, per-channel current remains low enough for duty-cycled designs.
推薦
推薦產品摘要
工程參考資料，適用於 TLV3502 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TLV3502AIDR | TLV3502AIDCNT | TLV3502-Q1 | LM393DR |
|---|---|---|---|---|---|
| Package | 8-SOIC (D) / 8-SOT-23 (DCN) | 8-SOIC (D) - same footprint | SOT-23-8 (DCN) - same footprint | 8-SOIC (D) - same footprint | 8-SOIC (D) - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Propagation Delay | 4.5 ns | 4.5 ns | 4.5 ns | 4.5 ns | ~1.3 us |
| Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2 V to 36 V |
| Output Stage | Push-pull CMOS, rail-to-rail | Push-pull CMOS | Push-pull CMOS | Push-pull CMOS | Open-collector |
| Hysteresis | 6 mV internal | 6 mV internal | 6 mV internal | 6 mV internal | None (external only) |
| Shutdown | No | No | No | No | No |
主要差異化特點
- Ultra-fast 4.5ns propagation delay (對比LM393DR)
- Push-pull CMOS output - no pull-up resistor (對比LM393DR)
- Built-in 6mV hysteresis and over-rail common-mode range (對比LM393DR)
設計說明
Bypass VCC with a 0.1uF ceramic capacitor placed within a few millimeters of pin 8, plus a 1uF bulk capacitor nearby. The TLV3502 switches in 4.5ns, generating fast supply transients; inadequate decoupling causes ground bounce and false triggering. Route V- return with a low-inductance ground plane rather than a thin trace.
Avoid driving inputs outside the input common-mode range; although it extends 0.2V beyond the rails, signals significantly below V- or above VCC+0.2V can cause output phase reversal or damage. Tie unused channel inputs to a defined potential (e.g., both to ground via the inputs) per TI E2E guidance - never leave them floating, as CMOS inputs pick up noise and the unused output may oscillate.
Keep the input traces short and, for differential signals, route them as a matched pair to preserve the 4.5ns delay advantage. The 6mV internal hysteresis helps with moderate noise, but for sources with high slew or reflection, add a small external positive-feedback resistor network for additional hysteresis. Minimize stub length on outputs driving long logic traces.
The 8-SOT-23 (DCN) package exposes no thermal pad, but thermal performance is adequate at 3.2mA/channel. For the 8-SOIC, keep high-speed output traces away from the inputs to prevent crosstalk-induced retriggering in window-comparator layouts.
合規資訊
RoHS compliant per TI product documentation. AEC-Q100 qualification applies to TLV3502-Q1 variant, not standard grade.
