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 level |
74HC (U) | High speed - CMOS (Unbuffered output) |
74HCS (U) | High speed - CMOS (SOS CMOS, Radiation hardened) |
74HCT | High speed - CMOS - TTL inputs |
74AHC | Advanced - High speed - CMOS |
74AHCT | Advanced - High speed - CMOS - TTL inputs |
74FCT (-A,T,AT) | Fast - CMOS - TTL inputs (speed variations) |
74AC | Advanced - CMOS |
74ACS (U) | High speed - CMOS (SOS CMOS, Radiation hardened) |
74ACT | Advanced - CMOS - TTL inputs |
74ACTS (U) | High speed - CMOS - TTL inputs (SOS CMOS, Radiation hardened) |
74FACT | AC, ACT (Q) series |
74ACQ | Advanced - CMOS - Quiet outputs |
74ACTQ | Advanced - CMOS - TTL inputs - Quiet outputs |
74AVC | Advanced very low voltage CMOS |
74AUC | Advanced ultra-low voltage CMOS |
74AUP | Advanced ultra-low power |
74UHS | Ultra High Speed |
74ULP | Ultra Low Power |
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 (BiCMOS) |
74CBT | Cross Bar Technology |
74CBTLV | CBT Low Voltage |
74CBTK | CBT - Active Clamp |
74FB | Futurebus+ [limited usage, see the Futurebus Interface page |
74GTL | Gunning - Transceiver - Logic [200MHz, Point-to-Point] |
74GTLP | GTL - Plus [120MHz, Multi-Point, Backplane] |
74SSTV | Series Stub Terminated Logic |
74TVC | Translation voltage clamp |
Low Voltage Families | |
74ALB | Advanced - Low Voltage - BiCMOS |
74LV (U) | Low - Voltage (Unbuffered output) (CMOS) |
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) (BiCMOS) |
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 and 5v supplies) |
74VCX | LV - CMOS (operates with 1.8v and 3.6v supplies |
74CBTLV | CBT - Low Voltage |
4000 | True CMOS (non-TTL levels, may use different Vcc) |
ECL Device Families: | |
MECL I | 8nS* [in production between 1962 to 1977] |
MECL II | 2nS* [in production between 1966 to 1979] |
MECL III | (16XX) 1nS* .......* = Rise & Fall Time [introduced in 1968] |
101xx | 100 series 10K ECL, 3.5nS* [introduced in 1971] |
102xx | 200 series 10K ECL, 2.5nS* |
108xx | 800 series 10K ECL, voltage compensated, 3.5nS* |
10Hxxx | 10K - High speed, voltage compensated, 1.8nS* [introduced in 1981] |
10Exxx | 10K - ECLinPS, voltage compensated, 800pS* |
10EPxxx | 10K - ECLinPS Plus, voltage compensated, 160pS* |
10ELxxx | 10K - ECLinPS Lite, Single gate, voltage compensated, 275pS* |
100xxx | 100K, temperature compensated |
100Hxxx | 100K - High speed, temperature compensated |
100Exxx | 100K - ECLinPS, temp, voltage comp., 800pS* |
High Speed Differential Signaling Families: | |
ECL | See above Emitter Coupled Logic |
PECL | Positive ECL, uses +5volts as Vcc; See above |
LVPECL | Low Voltage PECL, uses +3.3 volts as Vcc; See above |
LVDS | Low Voltage Differential Signaling, 400mV differential signal swing |
CML | Common Mode Logic, 800mV differential signal swing |
PCML | Pseudo Common Mode Logic, 200mV differential signal swing |
There are additional signaling types; however, many do not exist as a logic family.
FPGA's, Memory devices or other high-end logic devices may use different signaling levels.
The IC bus page list the addition digital interface levels.
This is a listing of TTL, ECL and CMOS Glue Logic Families, with a short description of how they differ from one another. The 74xx families are shown above, but the 54xx families also applies. The 74 designates commercial temperature ranges and the 54 designates operation at Military temperature ranges. Component manufacturers may be found by clicking the Components icons at the bottom of the page. In general, none of the logic families listed above will operate with any other logic family, the voltage thresholds are different for each logic family.
Refer to the Logic Family Voltage Translation page for interfacing techniques between logic families. Back to the Logic Design Page
The CMOS [74C] families listed under the 'true' TTL header are CMOS devices, but not 'true' CMOS devices. They're more CMOS than TTL but don't switch at CMOS levels, designed to work with TTL devices. To be considered a CMOS [54C] logic device the entire internal structure needs to be CMOS, otherwise the component would draw current like a TTL IC.
Many of the earlier logic families are obsolete or at least in decline. Some families are still only in production to support legacy programs.
The oldest of the logic families include the 'L', S, LS, C, and HC glue logic families.
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