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接口电路门限电平Interface Threshold Voltage Levels |
| 作者：iC921 栏目：模拟技术 |
Interface Threshold Voltage Levels  Comparison of Input and OUTPUT [I/O] LOGIC SWITCHing levels for the CMOS [5V], PECL [5V], rs422/485page Terms - VCC: The voltage applied to the POWER pin(s). In most cases the voltage the DEVICE needs to operate at. VIH: [Voltage Input High] The MINIMUM positive voltage applied to the input which will be accepted by the DEVICE as a LOGIC high. VIL: [Voltage Input Low] The maximum positive voltage applied to the input which will be accepted by the DEVICE as a LOGIC low. VOL: [Voltage OUTPUT Low] The maximum positive voltage from an OUTPUT which the DEVICE considers will be accepted as the maximum positive low level. VOH: [Voltage OUTPUT High] The maximum positive voltage from an OUTPUT which the DEVICE considers will be accepted as the MINIMUM positive high level. VT: [Threshold Voltage] The voltage applied to a DEVICE which is "transition-Operated", which cause the DEVICE to SWITCH. May also be listed as a '+' or '-' VALUE. DESCRIPTION of TTL, ECL and CMOS Glue LOGIC Families DEVICE Families: TTL (74xx) True TTL 74L Low POWER 74S Schottky 74H High speed 74LS Low POWER - Schottky 74AS ADVANCED - Schottky 74ALS ADVANCED - Low POWER - Schottky 74F(AST) FAST - (ADVANCED - Schottky) 74C CMOS...................check Vcc levels 74HC (U) High speed - CMOS (Unbuffered OUTPUT) 74HCT High speed - CMOS - TTL inputs 74AHC ADVANCED - High speed - CMOS 74AHCT ADVANCED - High speed - CMOS - TTL inputs 74FCT (-A) FAST - CMOS - TTL inputs (speed variations) 74FCT (-T, -AT) FAST - CMOS - TTL inputs (speed variations) 74AC ADVANCED - CMOS 74ACT ADVANCED - CMOS - TTL inputs 74FACT AC, ACT (Q) series 74ACQ ADVANCED - CMOS - Quiet OUTPUTs 74ACTQ ADVANCED - CMOS - TTL inputs - Quiet OUTPUTs Bus Driver Families 74ABT ADVANCED - BiCMOS - TECHNOLOGY 74ABTE ABT - Enhanced Transceiver LOGIC 74ABTH ADVANCED - BiCMOS - TECHNOLOGY - bus Hold 74BCT BiCMOS - TTL inputs 74BTL Backplane - Transceiver - LOGIC 74GTL Gunning - Transceiver - LOGIC 74GTLP GTL Plus Low Voltage Families 74ALB ADVANCED - Low Voltage - BiCMOS 74LV (U) Low - Voltage (Unbuffered OUTPUT) 74LVC (R) (U) LV - CMOS (damping RESISTOR)(Unbuffered OUTPUT) 74LVCH Low - Voltage - CMOS - bus Hold 74ALVC ADVANCED - Low - Voltage - CMOS 74LVT (R) (U) LV - TTL (damping RESISTOR(Unbuffered OUTPUT) 74LVTZ Low - Voltage - TTL - High Impedance POWER-up 74ALVC (R) ALV - CMOS (bus Hold) (damping RESISTOR) 74ALVCH ADVANCED - Low - Voltage - CMOS - bus Hold 74LCX LV - CMOS (operates with 3v & 5v supplies) 74VCX LV - CMOS (operates with 1.8v & 3.6V supplies 4000 True CMOS (non-TTL levels) ECL DEVICE Families: MEC I 8nS* MEC II 2nS* MEC III &nbs |
| 2楼： | >>参与讨论 |
| 作者： iC921 于 2006/1/31 0:35:00 发布：
图中RS-422和RS-485的部分对吗？ |
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