XR-2277 Datasheet (Exar) - Dot and Bar Graph Display Generators

XR-2277, Dot and Bar Graph Display Generators

FUNCTIONAL BLOCK DIAGRAM The XR-2277 and XR-2278 are 12 point level detector circuits designed for direct interfacing to light emitting diode (LED) moving-dot or bar-graph displays.

Each of the circuits is comprised of an input buffer amplifier and 12 comparators, biased from a resistor string at

XR-2277 Features

* High Impedance Buffered Input Direct LED Interface Constant Current Outputs External Dot/Bar Mode Select ORDERING INFORMATION Part Number XR-2277P XR-2278P Package Plastic Plastic Operating Temperature o

* e to + 70

* e o

* e to + 70

* e APPLICATIONS Bar-Gra