Data interface codec - Allicdata Electronics

Related Categories

< 58 59 60 61 62 >

Allicdata Part#	Mft.Part#	Company	Spec.	QTY.	Pricing(USD)
HIN208EIA-T-ND	HIN208EIA-T	Intersil	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 4/4 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 230kbps Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 24-SSOP (0.209", 5.30mm Width) Supplier Device Package: 24-SSOP Base Part Number: HIN208E	1000 Order	1+: $0
HIN237CB-T-ND	HIN237CB-T	Intersil	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 5/3 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 120Kbps Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 24-SOIC (0.295", 7.50mm Width) Supplier Device Package: 24-SOIC Base Part Number: HIN237	1000 Order	--
ICL3222IV-T-ND	ICL3222IV-T	Intersil	View more Packaging: Tape & Reel (TR) Part Status: Obsolete Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 2/2 Duplex: Full Receiver Hysteresis: 300mV Data Rate: 250kbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 20-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 20-TSSOP Base Part Number: ICL3222	1000 Order	1+: $0
SN65MLVD082DGGR G4-ND	SN65MLVD082DGGR G4	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: LVDS, Multipoint Number of Drivers/Receivers: 8/8 Duplex: Half Receiver Hysteresis: 25mV Data Rate: 250Mbps Voltage - Supply: 3 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 64-TFSOP (0.240", 6.10mm Width) Supplier Device Package: 64-TSSOP Base Part Number: SN65MLVD082	1000 Order	2000+: $2.1622
296-27779-2-ND	SN65LBC176DR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 50mV Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: SN65LBC176	2500 Order	--
ADM3202ARUZ-REE L7TR-ND	ADM3202ARUZ-REE L7	Analog Devices Inc.	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 2/2 Duplex: Full Receiver Hysteresis: 400mV Data Rate: 460Kbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: ADM3202	5000 Order	--
MAX3232CSE+TTR- ND	MAX3232CSE+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 2/2 Duplex: Full Receiver Hysteresis: 300mV Data Rate: 235Kbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 16-SOIC (0.154", 3.90mm Width) Supplier Device Package: 16-SO Base Part Number: MAX3232	5000 Order	2500+: $1.9049
296-41267-2-ND	ISO1050DWR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: CANbus Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 150mV Data Rate: 1Mbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: -55C ~ 105C Mounting Type: Surface Mount Package / Case: 16-SOIC (0.295", 7.50mm Width) Supplier Device Package: 16-SOIC Base Part Number: ISO1050	2141 Order	--
296-20723-2-ND	SN65HVD230MDREP	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: CANbus Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 100mV Data Rate: 1Mbps Voltage - Supply: 3 V ~ 3.6 V Operating Temperature: -55C ~ 125C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: SN65HVD230	5000 Order	2500+: $1.9171
DP83849IVS/NOPB -ND	DP83849IVS/NOPB	Texas Instruments	View more Packaging: Tray Part Status: Active Type: Transceiver Protocol: Ethernet Number of Drivers/Receivers: 2/2 Voltage - Supply: 3 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 80-TQFP Supplier Device Package: 80-TQFP (12x12) Base Part Number: DP83849	595 Order	--
568-8673-2-ND	PCA82C251T/YM,1 18	NXP USA Inc	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: CANbus Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 150mV Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: -40C ~ 125C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SO Base Part Number: PCA82C251	47500 Order	2500+: $0.5082 5000+: $0.5006
296-22607-2-ND	TRS3243EIPWR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 3/5 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 500kbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 28-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 28-TSSOP Base Part Number: TRS3243E	4000 Order	--
MAX488CSA+TTR-N D	MAX488CSA+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 70mV Data Rate: 250kbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: MAX488	2500 Order	2500+: $1.0433
MAX13052ESA+TTR -ND	MAX13052ESA+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: CANbus Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 70mV Data Rate: 1Mbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: MAX13052	2500 Order	2500+: $1.3674
296-33386-5-ND	MAX3232ECPW	Texas Instruments	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 2/2 Duplex: Full Receiver Hysteresis: 300mV Data Rate: 250kbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP Base Part Number: MAX3232E	4841 Order	--
MAX487ESA+-ND	MAX487ESA+	Maxim Integrated	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 70mV Data Rate: 250kbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: MAX487	453 Order	--
DS91C176TMA/NOP B-ND	DS91C176TMA/NOP B	Texas Instruments	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: LVDS Number of Drivers/Receivers: 1/1 Duplex: Half Data Rate: 200Mbps Voltage - Supply: 3 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: DS91C176	876 Order	--
TLE62582GXUMA1T R-ND	TLE62582GXUMA1	Infineon Technologies	View more Packaging: Tape & Reel (TR) Part Status: Not For New Designs Type: Transceiver Protocol: LINbus Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 600mV Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: -40C ~ 150C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: PG-DSO-8 Base Part Number: TLE6258	5000 Order	2500+: $0.3552 5000+: $0.3382
MLX80031KLW-CAA -000-RE-TR-ND	MLX80031KLW-CAA -000-RE	Melexis Technologies NV	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: LINbus Voltage - Supply: 5 V ~ 27 V Operating Temperature: -40C ~ 125C Mounting Type: Surface Mount Package / Case: 20-VQFN Exposed Pad Supplier Device Package: 20-QFN (5x5)	10000 Order	5000+: $0.4851
ISL81387IBZ-TTR -ND	ISL81387IBZ-T	Intersil	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232, RS422, RS485 Number of Drivers/Receivers: 2/2 Duplex: Half Receiver Hysteresis: 35mV Data Rate: 20Mbps Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 20-SOIC (0.295", 7.50mm Width) Supplier Device Package: 20-SOIC Base Part Number: ISL81387	1000 Order	1000+: $2.2453 2000+: $2.1622
1016-1135-5-ND	SP334CT-L	MaxLinear, Inc.	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: RS232, RS485 Number of Drivers/Receivers: 3/5 Duplex: Full Data Rate: 235Kbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 28-SOIC (0.295", 7.50mm Width) Supplier Device Package: 28-SOIC	140 Order	--
MAX3083EESD+TR- ND	MAX3083EESD+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 100mV Data Rate: 500kbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 14-SOIC (0.154", 3.90mm Width) Supplier Device Package: 14-SO Base Part Number: MAX3083	2500 Order	2500+: $1.5176
LTC2856CDD-1#PB F-ND	LTC2856CDD-1#PB F	Linear Technology/Analog Devices	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 25mV Data Rate: 20Mbps Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 8-WFDFN Exposed Pad Supplier Device Package: 8-DFN (3x3) Base Part Number: LTC2856	194 Order	1+: $1.8711 25+: $1.3303 100+: $1.0989
USB3326C-GL-TR- ND	USB3326C-GL-TR	Microchip Technology	View more Series: flexPWR Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: USB Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 150mV Voltage - Supply: 1.6 V ~ 2 V, 3 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 25-WLCSP Supplier Device Package: 25-WLCSP (1.97x1.97) Base Part Number: USB3326	1000 Order	3000+: $0.8544
296-22601-2-ND	TRS3238ECPWR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 5/3 Duplex: Full Receiver Hysteresis: 300mV Data Rate: 400kbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 28-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 28-TSSOP Base Part Number: TRS3238E	1000 Order	--
296-25080-2-ND	TRSF3223ECDBR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 2/2 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 1Mbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 20-SSOP (0.209", 5.30mm Width) Supplier Device Package: 20-SSOP Base Part Number: TRSF3223E	1000 Order	--
296-25033-2-ND	TRS3227EIDBR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 1Mbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 16-SSOP (0.209", 5.30mm Width) Supplier Device Package: 16-SSOP Base Part Number: TRS3227E	1000 Order	--
MAX3061EEKA#TG1 6TR-ND	MAX3061EEKA#TG1 6	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Last Time Buy Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 100mV Data Rate: 500kbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: SOT-23-8 Supplier Device Package: SOT-23-8 Base Part Number: MAX3061	1000 Order	1+: $0
296-37893-2-ND	SN75HVD08DR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 35mV Data Rate: 10Mbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: 75HVD08	1000 Order	2500+: $1.22 5000+: $1.1741
ISL32495EIBZ-T7 ATR-ND	ISL32495EIBZ-T7 A	Intersil	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 25mV Data Rate: 1Mbps Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: 8-SOIC Base Part Number: ISL32495E	1000 Order	250+: $1.8299 500+: $1.6419 1250+: $1.3847 2500+: $1.3155
296-40508-2-ND	SN65HVD1476DGSR	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 70mV Data Rate: 50Mbps Voltage - Supply: 3 V ~ 3.6 V Operating Temperature: -40C ~ 125C Mounting Type: Surface Mount Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Supplier Device Package: 10-VSSOP Base Part Number: 65HVD1476	0 RFQ	2500+: $1.4471
MAX3172EAI+-ND	MAX3172EAI+	Maxim Integrated	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 240kbps Voltage - Supply: 3 V ~ 3.6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: MAX3172	250 Order	1+: $9.8406 10+: $9.2856 25+: $7.4285 50+: $7.057 100+: $6.4999 250+: $6.1657
ISL32613EFHZ-T7 ATR-ND	ISL32613EFHZ-T7 A	Intersil	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Driver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/0 Data Rate: 128Kbps Voltage - Supply: 1.8 V ~ 3.6 V Operating Temperature: -40C ~ 125C Mounting Type: Surface Mount Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6 Base Part Number: ISL32613E	250 Order	250+: $1.1214 500+: $0.9812 1250+: $0.813 2500+: $0.7569 6250+: $0.7289
TLE72593GEXUMA3 TR-ND	TLE72593GEXUMA3	Infineon Technologies	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: LINbus Number of Drivers/Receivers: 1/1 Receiver Hysteresis: 120mV Data Rate: 20kbps Voltage - Supply: 5.5 V ~ 27 V Operating Temperature: -40C ~ 150C Mounting Type: Surface Mount Package / Case: 8-SOIC (0.154", 3.90mm Width) Supplier Device Package: PG-DSO-8-16	1000 Order	2500+: $0.268 5000+: $0.2546 12500+: $0.245 25000+: $0.2373
LTC1543IG#PBF-N D	LTC1543IG#PBF	Linear Technology/Analog Devices	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: Multiprotocol Number of Drivers/Receivers: 3/3 Duplex: Full Receiver Hysteresis: 15mV Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: 28-SSOP (0.209", 5.30mm Width) Supplier Device Package: 28-SSOP Base Part Number: LTC1543	22 Order	--
MAX203ECPP+G36- ND	MAX203ECPP+G36	Maxim Integrated	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 2/2 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 120Kbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: 0C ~ 70C Mounting Type: Through Hole Package / Case: 20-DIP (0.300", 7.62mm) Supplier Device Package: 20-PDIP Base Part Number: MAX203	1000 Order	1+: $4.9833 10+: $4.7345 25+: $4.4163 50+: $4.3417
LTC1483IN8#PBF- ND	LTC1483IN8#PBF	Linear Technology/Analog Devices	View more Packaging: Tube Part Status: Active Type: Transceiver Protocol: RS422, RS485 Number of Drivers/Receivers: 1/1 Duplex: Half Receiver Hysteresis: 45mV Data Rate: 250kbps Voltage - Supply: 4.75 V ~ 5.25 V Operating Temperature: -40C ~ 85C Mounting Type: Through Hole Package / Case: 8-DIP (0.300", 7.62mm) Supplier Device Package: 8-PDIP Base Part Number: LTC1483	1000 Order	1+: $2.3436 25+: $1.5546 100+: $1.2852
MAX202CDRE4-ND	MAX202CDRE4	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 2/2 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 120Kbps Voltage - Supply: 4.5 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 16-SOIC (0.154", 3.90mm Width) Supplier Device Package: 16-SOIC Base Part Number: MAX202	1000 Order	2500+: $0.2743
MAX3190EEUT+T-N D	MAX3190EEUT+T	Maxim Integrated	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Driver Protocol: RS232 Number of Drivers/Receivers: 1/0 Duplex: Full Receiver Hysteresis: 100mV Data Rate: 460Kbps Voltage - Supply: 4.5 V ~ 6 V Operating Temperature: -40C ~ 85C Mounting Type: Surface Mount Package / Case: SOT-23-6 Supplier Device Package: SOT-23-6 Base Part Number: MAX3190	1000 Order	2500+: $0.4821
TRS3221ECPWR-LI -ND	TRS3221ECPWR-LI	Texas Instruments	View more Packaging: Tape & Reel (TR) Part Status: Active Type: Transceiver Protocol: RS232 Number of Drivers/Receivers: 1/1 Duplex: Full Receiver Hysteresis: 500mV Data Rate: 250kbps Voltage - Supply: 3 V ~ 5.5 V Operating Temperature: 0C ~ 70C Mounting Type: Surface Mount Package / Case: 16-TSSOP (0.173", 4.40mm Width) Supplier Device Package: 16-TSSOP	1000 Order	2000+: $0.4839

< 58 59 60 61 62 >

Hot Searches: data interface codec data codec ic adafruit interface codec advanced interface codec weapon interface codec analog interface codec akm interface codec glitch interface codec cirrus interface codec cml interface codec dialogue interface codec freescale interface codec harris interface codec infineon interface codec intel interface codec landik interface codec lucent interface codec maxim interface codec motorola interface codec national interface codec

Search Result:data interface codec

Related Categories