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MC1455BDR2G

555 timer, bipolar, 500kHz, SOIC-8

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جزء الشركة المصنعة ： جزء الشركة المصنعة

MC1455BDR2G

الحزمة ： الحزمة

SOIC-8

الوصف

نظرة عامة على المنتج

The MC1455BDR2G from onsemi is a bipolar 555 timer capable of operating up to 500kHz in astable and monostable modes, in an SOIC-8 package for timing and oscillator applications.

المواصفات الرئيسية

الحزمة

SOIC-8

الميزات

See datasheet for complete specifications
Industry-standard package

التطبيقات

Industrial control
Consumer electronics
Communication equipment
Automotive electronics

مقدمة المنتج:MC1455BDR2G مقدمة المنتج

The MC1455BDR2G from onsemi is a bipolar 555 timer capable of operating up to 500kHz in astable and monostable modes, in an SOIC-8 package for timing and oscillator applications.

مبدأ العمل:MC1455BDR2G مبدأ العمل

The MC1455BDR2G is a bipolar 555 timer IC from onsemi in SOIC-8, capable of operating in both monostable (one-shot) and astable (free-running) modes at frequencies up to 500kHz. The internal architecture consists of: (1) Three 5k-ohm resistors forming a voltage divider that sets VCC/3 and 2VCC/3 reference levels; (2) Two comparators (upper and lower) that compare the threshold and trigger inputs against these references; (3) An SR flip-flop that stores the output state; (4) A discharge transistor (open-collector on pin 7) that controls the timing capacitor. In monostable mode: A falling edge on TRIGGER (below VCC/3) sets the flip-flop, output goes HIGH, and the discharge transistor turns OFF, allowing the external timing capacitor (CT) to charge through the timing resistor (RT). When the capacitor voltage reaches 2VCC/3, the upper comparator resets the flip-flop, output goes LOW, and the discharge transistor turns ON, rapidly discharging CT. The pulse width = 1.1 x RT x CT. In astable mode: The capacitor charges through R1+R2 and discharges through R2 only, creating a free-running oscillator. The frequency = 1.44 / ((R1 + 2R2) x CT), with duty cycle = (R1+R2)/(R1+2R2). The bipolar output can sink and source 200mA directly, driving relays, LEDs, and small motors. The CONTROL VOLTAGE pin allows external modulation of the timing reference, enabling pulse-width modulation. The -BDR2G suffix specifies SOIC-8, lead-free, tape-and-reel.

وصف الدبوس:MC1455BDR2G تعريف الدبوس ووظائفه

دبوس	الاسم	النوع	الوظيفة
1	GND	الطاقة	Ground (connect to circuit common)
2	TRIGGER	المدخلات	Trigger input (LOW < VCC/3 starts timing cycle, output goes HIGH)
3	OUTPUT	المخرجات	Timer output (HIGH during timing cycle, sinks/sources 200mA)
4	إعادة الضبط	المدخلات	Active LOW reset (overrides trigger, forces output LOW)
5	CONTROL VOLTAGE	المدخلات	Control voltage (bypass with 0.01uF for noise immunity)
6	THRESHOLD	المدخلات	Threshold input (HIGH > 2VCC/3 ends timing cycle, output goes LOW)
7	DISCHARGE	المخرجات	Open-collector discharge (discharges timing capacitor between cycles)
8	VCC	الطاقة	Supply (4.5-16V, typical 5-12V)

Application Scenarios:In which products and applications isMC1455BDR2G مستعمل

Industrial control

Consumer electronics

Communication equipment

Automotive electronics

Alternative Models:What chips are recommended as replacements for MC1455BDR2G

الشركة المصنعة	رقم الجزء	الحزمة	الملاحظات
أونسمي	MC1455BDR2G	SOIC-8	Same device, onsemi brand
تكساس إنسترومنتس	NE555DR	SOIC-8	Original 555 timer, TI brand
أونسمي	LMC555CM	SOIC-8	CMOS 555, 1.5MHz, 100uA supply, lower power
تكساس إنسترومنتس	TLC555CDR	SOIC-8	CMOS 555, 2.1MHz, 170uA supply
شركة ديودز	SA555DR2G	SOIC-8	555 timer, Diodes Inc brand, lower cost