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MC74VHC1G32DFT2G

Single 2-Input OR Gate, TTL In, 2-5.5V, SC-70-5

15000

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جزء الشركة المصنعة ： جزء الشركة المصنعة

MC74VHC1G32DFT2G

الحزمة ： الحزمة

SC-88A / SC-70-5 (2.0 x 1.25 x 1.0 mm, 0.65mm pitch)

الوصف

نظرة عامة على المنتج

The MC74VHC1G32DFT2G from onsemi is a single 2-input OR gate with TTL-compatible inputs, 2-5.5V VCC, 3.5ns propagation delay, and SC-88A (SC-70-5) package.

المواصفات الرئيسية

النوع	Single 2-Input OR Gate (TTL-Compatible Inputs)
Logic Function	OR (Y = A + B)
جهد الإمداد	2.0V to 5.5V
تأخير الانتشار	3.5 ns (typ) at VCC=5V; 7.5 ns (max) at VCC=4.5-5.5V
Input Threshold	TTL: VIH=2.0V, VIL=0.8V (T32 variant)
Output Drive	+/-8 mA at 3.0V VCC
تيار التهدئة	1 uA (max) at 25C
Input Overvoltage	Tolerant to 5.5V (regardless of VCC)
الحزمة	SC-88A / SC-70-5 (DFT2 suffix)
درجة حرارة التشغيل	-55C to +125C

الميزات

TTL-compatible input thresholds (MC74VHC1GT32)
2.0V to 5.5V VCC operation
3.5ns typical propagation delay at 5V
Input overvoltage tolerant to 5.5V
IOFF partial power-down protection
+/-8mA output drive at 3V
Pb-free, halogen-free, RoHS compliant

التطبيقات

Logic-level translation (3V to 5V)
General-purpose logic glue
Signal combining and OR-ing
Buffer/interface logic

مقدمة المنتج:MC74VHC1G32DFT2G مقدمة المنتج

The MC74VHC1G32DFT2G from onsemi is a single 2-input OR gate in a tiny SC-88A (SC-70-5) surface-mount package. The DFT2 suffix denotes the SC-88A package with tape and reel packaging, and G indicates the Pb-free version. The MC74VHC1G32 variant has CMOS-level input thresholds, while the MC74VHC1GT32 variant (indicated by the T in the full part number MC74VHC1GT32DFT2G) has TTL-compatible input thresholds (VIH=2.0V, VIL=0.8V). The TTL input thresholds allow the gate to interface directly with 5V TTL logic outputs even when operating at a lower VCC (e.g., 3.3V), because a 5V TTL output high level (2.4V minimum) exceeds the 2.0V VIH threshold. The input overvoltage tolerance to 5.5V regardless of VCC allows the gate to be used as a logic-level translator from 5V CMOS to 3.3V CMOS: the inputs can be driven by 5V signals while VCC is 3.3V, and the outputs will swing to 3.3V CMOS levels. The IOFF circuit ensures that when VCC is 0V, the inputs and outputs are disabled and do not load the bus, preventing back-feeding in power-down scenarios. The 1uA maximum quiescent current at 25C minimizes standby power consumption.

مبدأ العمل:MC74VHC1G32DFT2G مبدأ العمل

The MC74VHC1G32DFT2G implements the OR logic function Y = A + B using CMOS transistor-level logic. The OR function is built from NAND and NOR gates with inverters using the DeMorgan equivalent implementation: Y = A + B = (A’ * B’)’ . The three-stage internal circuit provides buffering for high noise immunity and stable output characteristics. The TTL-compatible input threshold variant (T32) uses a modified input stage that sets the switching threshold at TTL levels (VIH=2.0V, VIL=0.8V) rather than CMOS levels (VIH=0.7xVCC, VIL=0.3xVCC). This allows the gate to recognize 5V TTL logic levels even when operating at 3.3V VCC. The output stage uses a balanced CMOS push-pull driver (P-channel pull-up, N-channel pull-down) providing symmetrical output impedance and rail-to-rail output swing. The input protection circuit uses diodes to VCC and GND that clamp input voltages beyond the supply rails, and the overvoltage-tolerant input structure allows the protection diodes to block (not conduct) when the input voltage exceeds VCC up to 5.5V, achieved by isolating the VCC-referenced clamp diode from the input.

وصف الدبوس:MC74VHC1G32DFT2G تعريف الدبوس ووظائفه

دبوس	الاسم	النوع	الوظيفة
1	A	المدخلات	OR gate input A
2	B	المدخلات	OR gate input B
3	GND	الطاقة	أرضي
4	Y	المخرجات	OR gate output (Y = A + B)
5	VCC	الطاقة	Supply voltage (2.0-5.5V)

Application Scenarios:In which products and applications isMC74VHC1G32DFT2G مستعمل

3.3V to 5V logic level translation: 3.3V MCU GPIO OR-ed with 5V peripheral interrupt using TTL input thresholds and 5.5V input overvoltage tolerance
Power-good OR-ing: two power supply PGOOD signals (active-low) combined through OR gate with pull-up to create a combined power-good indicator
General-purpose glue logic in space-constrained design where a single OR function is needed in a 2×1.25mm SC-70-5 footprint

Alternative Models:What chips are recommended as replacements for MC74VHC1G32DFT2G

الشركة المصنعة	رقم الجزء	الحزمة	الملاحظات
أونسمي	MC74VHC1G32DFT1G	SC-88A	CMOS-level inputs (non-T)
TI	SN74LVC1G32DCKR	SC-70-5	Direct equivalent, TI brand
NXP	74LVC1G32GW	SOT-353	Equivalent, different brand
توشيبا	TC7SG32FU	USV-5	Equivalent, Toshiba brand
أونسمي	NL27WZ32DFT2G	SC-88A	Dual OR gate, same footprint