RC73687

The RC73687 is a very high speed dual comparator with latched input option and ECL compatible outputs capable of driving 509 terminated lines. The RC73687 is configured as two independent comparators and is pin-for-pin compatible with the industry standard 9687 comparators. The RC73687 low propagation delay (2.2 ns maximum), vvide input common range (-4V to +8V) and lovv bias current uA maximum) makes it ideal for monitoring outputs from TTL, CMOS, ECL and even GaAs devices in ATE applications. The propagation delay dispersion is only ±80 ps (typical). The RC73687 features a high impedance input mode (ID) that reduces the bias current to ±50 pA (typical), effectively removing the DC electrical load of the comparator inputs. The RC73687 also has a latch function to sample the input waveforms. Latches A and are controlled by differential latch enable (LEA and LEB) ECL signals. The RC73687 is designed to operate With VCC supply voltages of +5.0V to +10V. Operation at +10V Will provide a wider input common mode voltage range, (-4V to +8V) versus (-4V to It also provides a lower input capacitance (1.0 pF) versus (1.5 pF) The RC73687 is fabricated using Fairchild's high performance complementary bipolar process.

The features of RC73687 can be summarized as (1)12 max differential input voltage(for VCC = +10V, VEE = -5.2V); (2)low propagation delays: -1.8 ns typical; (3)low delay dispersion (±65 ps typical) and drift (4 ps/°C typical); (4)±5 mV maximum input offset and 10 V/°C max. drift; (5)±3A typical bias current; 50 pA typ. in disable mode common mode rejection 70 dB; (6)input disable mode (transparent to user); (7)latch function; (8)RC73687 is pin-for-pin compatible with 9687 comparators; (9)available in 16-pin SOIC, 20-pin PLCC or 16-pin PDIP.

The absolute maximum ratings of RC73687 are (1)positive power supply, Vcc: +11V; (2)negative power supply, VEE :-6.3V; (3)difterence between Vcc and VEE: 16.6V; (4)input voltage at VIA+, VIB+: VCC+0.7V; (5)input voltage at VlA-, VlB-: VEE -(6)differential input voltage |VlA+ - VlA-, | VlB+ - VIB-|, 12V; (7)input voltage at LEA, LEB: VCC; (8)lnput voltage at, LEA, LEB: VEE; (9)operating temperature range: -40°C to +85°C; (10)storage temperature range:-65 °C to +125°C; (11)lead temperature range (solder 10 sec): 260°C.