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AM26C31MJR

Quad RS-422 diff line driver, 10Mbps, 7ns prop delay, BiCMOS, 3-state, mil-temp -55~125°C, 16-CDIP

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AM26C31MJR

الحزمة ： الحزمة

16-pin CDIP (21.3 x 6.9mm, ceramic)

الوصف

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The AM26C31MJR is a quadruple differential line driver from Texas Instruments that meets or exceeds TIA/EIA-422-B and ITU V.11 standards. Using BiCMOS technology, it achieves 7ns propagation delay with only 100µA typical supply current. The military-grade MJR suffix specifies operation from -55°C to +125°C in a 16-pin CDIP package, with ±2000V HBM ESD protection and high-impedance outputs when powered down.

المواصفات الرئيسية

Drivers	4 (differential, complementary outputs)
Standard	TIA/EIA-422-B, ITU V.11
جهد الإمداد	5V (single supply)
Signaling Rate	Up to 10 Mbps
تأخير الانتشار	7 ns typical (tPLH = tPHL)
Pulse Skew	0.5 ns typical
Supply Current	100 µA typical (no load)
Differential Output Voltage	2V minimum (RL = 100Ω)
Common-Mode Range	-7V to +7V
Outputs	3-state, high impedance when disabled or powered down
Enable	Active-high (G) and active-low (Ḡ) enable inputs
Fault Protection	-14V to +14V
ESD Protection	±2000V HBM, ±1000V CDM
الحزمة	16-pin CDIP (ceramic)
درجة حرارة التشغيل	-55°C to +125°C (military)

الميزات

Meets TIA/EIA-422-B and ITU V.11 requirements
BiCMOS technology: high speed with low power
7ns propagation delay and 0.5ns pulse skew
3-state outputs with high-impedance on power-down
Dual enable inputs (active-high and active-low)
Complementary differential outputs
Direct replacement for AM26LS31 with improved specs
MIL-PRF-38535 qualified (M suffix)
±2000V HBM ESD protection

التطبيقات

Military and aerospace communication systems
Industrial RS-422 bus transmitters
Motor encoder interfaces
Field transmitters (pressure, temperature sensors)
Modbus communication links
Long-distance balanced data transmission

مقدمة المنتج:AM26C31MJR مقدمة المنتج

The AM26C31MJR is a military-grade quadruple differential line driver from Texas Instruments, designed to meet or exceed TIA/EIA-422-B and ITU V.11 interface standards. Built with BiCMOS technology, it achieves 7ns propagation delay and 0.5ns pulse skew while drawing only 100µA typical supply current — dramatically lower than the bipolar AM26LS31 it replaces. The device features four independent differential drivers with complementary outputs, dual enable inputs (active-high G and active-low Ḡ), and 3-state outputs that go high-impedance when disabled or powered down. The MJR suffix denotes the ceramic CDIP package with full military temperature range (-55°C to +125°C) and MIL-PRF-38535 qualification.

مبدأ العمل:AM26C31MJR مبدأ العمل

Each of the four AM26C31 drivers takes a single-ended TTL/CMOS input (A) and generates a complementary differential output pair (Y and Z). When the input is high, Y is high and Z is low; when input is low, Y is low and Z is high. The differential output swings approximately 2V across a 100Ω load, meeting the EIA-422 minimum requirement. The BiCMOS output stage combines bipolar transistors for high drive current with CMOS logic for low standby power. The enable function gates all four drivers simultaneously: when G is high AND Ḡ is low, all outputs are active; any other enable combination forces all outputs to high-impedance. When the device is powered down (VCC = 0V), the outputs also go high-impedance, preventing loading of the bus — critical in multi-transmitter RS-422 systems where only one driver should be active at a time.

وصف الدبوس:AM26C31MJR تعريف الدبوس ووظائفه

دبوس	الاسم	الوصف
1	1A	Driver 1 input
2	1Y	Driver 1 non-inverting output
3	1Z	Driver 1 inverting output
4	G	Active-high enable (common to all 4 drivers)
5	2Z	Driver 2 inverting output
6	2Y	Driver 2 non-inverting output
7	2A	Driver 2 input
8	GND	أرضي
9	3A	Driver 3 input
10	3Y	Driver 3 non-inverting output
11	3Z	Driver 3 inverting output
12	Ḡ	Active-low enable (common to all 4 drivers)
13	4Z	Driver 4 inverting output
14	4Y	Driver 4 non-inverting output
15	4A	Driver 4 input
16	VCC	+5V supply

Application Scenarios:In which products and applications isAM26C31MJR مستعمل

Military Data Link: Transmit digital data over 1000+ meters of twisted-pair cable in military vehicles and shelters. The -55°C to +125°C temperature range handles unheated vehicle compartments and desert environments. The ceramic CDIP package withstands mechanical shock and vibration. Pair with the AM26C32MJR receiver for a complete military-spec RS-422 link.
Motor Encoder Interface: Drive quadrature encoder signals from a motor controller to a drive unit over 50-100m cables. The 10Mbps data rate supports high-resolution encoders at high RPM. The complementary outputs reject common-mode noise picked up on the cable. The 0.5ns pulse skew preserves encoder signal integrity.
Industrial Modbus Network: Use as the transmitter in an RS-422 Modbus RTU network. The 3-state outputs allow multiple drivers to share the bus using the enable pins for direction control. The high-impedance power-down state ensures that a failed transmitter does not block bus communication.

Alternative Models:What chips are recommended as replacements for AM26C31MJR

الطراز	Temp Range	الحزمة	الفرق الرئيسي
AM26C31IDR	-40~85°C	SOIC-16	Industrial grade, surface mount
AM26LS31MJ	-55~125°C	CDIP-16	Bipolar predecessor, higher power
DS26C31TM	-55~125°C	SOIC-16	NatSemi/TI alternative, military
MC3487	0~70°C	DIP-16	NXP/ON Semi, commercial grade