What the 40 µA supply means on a battery-powered display
The MM145453V/NOPB: The 40 µA typical supply current is the whole-chip draw driving a static or slowly-updated LCD — think a handheld meter or a panel gauge that runs months on a coin cell.
4.5-digit resolution and display configuration
4.5 digits means the driver handles a full 19999 count plus a half-digit for polarity or overrange — standard for a 3¾-digit or 4½-digit DPM. The configuration supports 7-segment numeric, alphanumeric, and bar-graph segments, so the same part drives a multi-character readout or a simple bargraph panel.
44-PLCC package — rework and board-fit
The 44-lead PLCC with J-leads (44-LCC J-Lead) is a surface-mount package that hand-solders well with a fine-tip iron — the J-lead wicks solder under the body.
Serial interface and temperature grade
The serial interface is a simple shift-register load — no I²C or SPI protocol overhead, just data, clock, and latch lines that any GPIO bank can bit-bang.