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CBM485AMS8

Corebai Microelectronics · RS-485 / RS-422 ICs · MSOP-8

CBM485AMS8 from Corebai Microelectronics, in a MSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	RO	output	Receiver output: RO is high when A > B by more than 200mV and low when A < B by more than 200mV.
2	RE	input	Receiver output enable: RO is active when RE is low and is in high-impedance state when RE is high.
3	DE	input	Driver output enable: driver outputs Y and Z are active when DE is high and high-impedance when DE is low.
4	DI	input	Driver input: a low on DI forces Y low and Z high, and a high on DI forces Y high and Z low.
5	GND	power_in	Ground reference for the device.
6	A	bidirectional	Receiver non-inverting input and driver non-inverting output.
7	B	bidirectional	Receiver inverting input and driver inverting output.
8	VCC	power_in	Positive supply: 4.75V ≤ VCC ≤ 5.25V.

Key specifications

Parameter	Value
Manufacturer	Corebai Microelectronics
Package	MSOP-8
Category	Interface
Pins	8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply voltage	VCC	4.75		5.25	V		3
Operating temperature range	TA	-40		125	°C		4
Supply voltage (VCC)	VCC			12	V		4
Control input voltage (DE, DI, RE)		-0.5			V	Upper limit printed as VCC+0.5V (not numeric)	4
Driver input voltage (DI)		-0.5			V	Upper limit printed as VCC+0.5V (not numeric)	4
Driver output voltage (A, B)		-8		12.5	V		4
Receiver output voltage (A, B)		-8		12.5	V		4
Storage temperature range		-65		160	°C		4
Differential driver output (no load)	VOD1			5	V		5
Differential driver output (loaded)	VOD2	2			V	R = 50Ω (RS-422)	5
Differential driver output (loaded)	VOD2	1.5			V	R=274Ω (RS-485), Figure 0	5
Change in magnitude of driver differential output voltage	ΔVOD			0.2	V	R = 27Ω or 50Ω, Figure 0	5
Driver common-mode output voltage	VOC			3	V	R = 27Ω or 100Ω, Figure 0	5
Change in magnitude of driver common-mode output voltage	ΔVOC			0.2	V	R = 27Ω or 100Ω, Figure 0	5
High-level input voltage	VIH	2			V	DE, DI, RE	5
Low-level input voltage	VIL			0.8	V	DE, DI, RE	5
Input current	IIN1	-2		2	μA	DE, DI, RE	5
Input current (A, B)	IIN2			1	mA	DE = 0V ; VCC=0V or 5.25V; VIN=12V	5
Input current (A, B)	IIN2	-0.8			mA	VIN=-7V	5
Receiver differential threshold voltage	VTH	-0.2		0.2	V	-7V ≤ VCM ≤12V	5
Receiver input hysteresis voltage	ΔVTH		70		mV	VCM = 0V	5
Receiver high-level output voltage	VOH	3.5			V	IO = -4mA, VID = 200mV	5
Receiver low-level output voltage	VOL			0.4	V	IO = 4mA, VID = -200mV	5
Receiver three-state (high-impedance) output current	IOZR	-1		1	µA	0.4V ≤ VO ≤ 2.4V	5
Receiver input resistance	RIN	12			kΩ	-7V ≤ VCM ≤ 12V	5
No-load supply current	ICC		500	900	μA	DE = VCC	6
No-load supply current	ICC		300	500	μA	RE = 0V or VCC	6
Driver short-circuit current	IOSD1		35	250	mA	-7V≤VO≤12V (Note 4)	6
Driver short-circuit current, VO = high	IOSD2		35	250	mA	-7V≤VO≤12V (Note 4)	6
Driver short-circuit current, VO = low	IOSR		7	95	mA	0V ≤ VO ≤ VCC	6
Electrostatic protection (HBM)		15			kV	针脚A, B, Y和Z，测试时使用人体测试模式（HBM）	6
Driver input to output propagation delay (tPLH)	tPLH	10	55	60	ns	RDIFF = 54, CL1 = CL2 = 100pF	7
Driver input to output propagation delay (tPHL)	tPHL	10	55	60	ns	RDIFF = 54, CL1 = CL2 = 100pF	7
Driver output skew	tSKEW		5	10	ns	RDIFF = 54, CL1=CL2= 100pF	7
Driver enable to loaded high output	tZH		40	70	ns	CL= 100pF, S2 closed	7
Driver enable to loaded low output	tZL		40	70	ns	CL = 100pF, S1 closed	7
Driver disable from no-load low output	tLZ		40	70	ns	CL = 15pF, S1 closed	7
Driver disable from no-load high output	tHZ		40	70	ns	CL = 15pF, S2 closed	7
Receiver input to output propagation delay (tPLH)	tPLH	20	60	100	ns	RDIFF = 54 CL1 = CL2 = 100pF	7
Receiver input to output propagation delay (tPHL)	tPHL	20	60	100	ns	RDIFF = 54 CL1 = CL2 = 100pF	7
Receiver loaded high-level output time	tLZ		30	50	ns	CRL = 15pF, S1 closed	7
Receiver low-level disable time	tHZ		30	50	ns	CRL = 15pF, S2 closed	7
Maximum data rate	fMAX		30	50	Mbps		7

CAD (KiCad official)

Symbol: CBM485AMS8
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)
3D model files: cbm485ams8-etched.step / cbm485ams8-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cbm485ams8.step / cbm485ams8.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Corebai Microelectronics datasheet (15 pp, sha256 cd607a9155fd0b38, retrieved 2026-10-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF