TC7211AM

1 TC7211AM BUS COMPATIBLE 4-DIGIT CMOS DECODER/DRIVER FEATURES s s s s s 4-Digit Non-Multiplexed 7-Segment LCD Outputs With Backplane Driver Input and Digit Select Data Latches RC Oscillator On-Chip Generates Backplane Drive Signal Eliminates DC Bias Which Degrades LCD Life Backplane Input/Output Pin Permits Synchronization of Cascaded Slave Device to a Master Backplane Signal Binary and BCD Inputs Decoded to Code B (0 to 9, —, E, H, L, P, Blank) Pin Compatible and Functionally Equivalent to ICM7211AM 2 3 4 5 6 7 GENERAL DESCRIPTION The TC7211AM (LCD Decoder/driver) is a CMOS direct drive, 4-digit, 7-segment display decoder and driver. The TC7211AM drives conventional LCDs. An RC oscillator, divider chain, backplane driver, and 28-segment outputs are provided on a single CMOS chip. The segment drivers supply square waves of the same frequency as the backplane, but in-phase for an OFF segment and out-ofphase for an ON segment. The net DC voltage applied between driver segment and backplane is near zero maximizing display lifetime. The four bit binary input is decoded into the seven segment alphanumeric code known as "Code B". The "Code B" output format results in a 0 to 9,—, E, H, L, P or blank display. True BCD or binary inputs will be correctly decoded to the seven segment display format. s s PIN CONFIGURATIONS ORDERING INFORMATION V+ E1 G1 F1 BP A2 B2 C2 D2 1 2 3 4 5 6 7 8 9 40 D1 39 C1 Part No. TC7211AMIPL Driver Type LCD Input Package Code 40-Pin Code B Plastic DI...