Features: Low propagation delay - 1.7ns ML65245
2.0ns ML65L245
Fast 8-bit TTL level transceiver with three-statecapability on the output
TTL compatible input and output levels
Schottky diode clamps on all inputs to handleundershoot and overshoot
Onboard schottky diodes minimize noise
Reduced output swing of 0 4.1 volts
Ground bounce controlled outputs, typically lessthan 400mV
Industry standard FCT245 type pinout
Applications include high speed cache memory, mainmemory, processor bus buffering, and graphics cards
ApplicationThere are a wide variety of needs for extremely fast buffersin high speed processor system designs like Pentium,PowerPC, Mips, Sparc, Alpha and other RISC processors.These applications are either in the cache memory area orthe main memory (DRAM) area. In addition, fast buffersfind applications in high speed graphics and multimedia applications. The high capacitive loading due tomultiplexed address lines on the system bus demandexternal buffers to take up the excess drive current. Theneeded current to skew the transitions between rise andfall times must be done without adding excessivepropagation delay. The ML65244 and ML65L244 areequipped with Schottky diodes to clean up ringing fromovershoot and undershoot caused by reflections inunterminated board traces.
Pinout
SpecificationsVCC ............................................................... 0.3V to 7V
DC Input voltage ............................. 0.3V to VCC + 0.3V
AC Input voltage (< 20ns) ...................................... 3.0V
DC Output voltage ........................ .. 0.3V to VCC + 0.3V
Output sink current (per pin) .................................. 120mA
Storage temperature ................................ 65 to 150
Junction temperature ............................................... 150
Thermal Impedance (qJA)
SOIC ............................................................... 96/W
QSOP ............................................................ 100/WDescriptionThe ML65245 and ML65L245 are non-inverting octaltransceivers. The high operating frequency (50MHzdriving a 50pF load) and low propagation delay(ML65245 1.7ns, ML65L245 2ns) make them ideal forvery high speed applications such as processor busbuffering and cache and main memory control.
These transceivers ML65245 use a unique analog implementation toeliminate the delays inherent in traditional digital designs.
Schottky clamps reduce under and overshoot, and specialoutput driver circuits limit ground bounce. The ML65245and ML65L245 conform to the pinout and functionality ofthe industry standard FCT245 and are intended forapplications where propagation delay is critical to thesystem design.
Note: This part was previously numbered ML6580.
ML65245 Data Sheet
