OM5234/FBB/536

Product Summary

The OM5234/FBB/536 is a CMOS single-chip 8-bit microcontroller. It is manufactured in an advanced CMOS process and is a derivative of the 80C51 microcontroller family. The OM5234/FBB/536 is pre-programmed devices for specific applications. Unless specifically stated otherwise, all references to OM5234 apply equally to OM5284. The OM5234/FBB/536 contains a non-volatile 16k×8 read-only program memory, a volatile 256×8 read/write data memory, four 8-bit I/O ports, two 16-bit timer/event counters (identical to the timers of the 80C51), a multi-source, two-priority-level, nested interrupt structure, UART and on-chip oscillator and timing circuits.

Parametrics

OM5234/FBB/536 absolute maximum ratings: (1)VIL Input low voltage, except EA, P1.6, P1.7: –0.5 to 0.2VDD–0.1V; (2)VIL1 Input low voltage to EA: –0.5 to 0.2VDD–0.3 V; (3)VIL2 Input low voltage to P1.6, P1.7: –0.5 to 0.3VDD V; (4)VIH Input high voltage, except XTAL1, RST, P1.6, P1.7: 0.2VDD+0.9 to VDD+0.5 V; (5)VIH1 Input high voltage, XTAL1, RST: 0.7VDD to VDD+0.5 V; (6)VOL Output low voltage, ports 1, 2, 3, except P1.6, P1.7 IOL = 1.6mA: 0.45V; (7)VOL1 Output low voltage, port 0, ALE, PSEN IOL = 3.2mA: 0.45V; (8)VOL2 Output low voltage, P1.6, P1.7 IOL = 3.0mA: 0.4 V; (9)VOH Output high voltage, ports 1, 2, 3, ALE, PSEN8 IOH =–25μA: 0.75VDD V; (10)IIL Logical 0 input current, ports 1, 2, 3, except P1.6, P1.7 VIN = 0.45V:–50μA; (11)ITL Logical 1-to-0 transition current, ports 1, 2, 3, except P1.6, P1.7:–650μA; (12)IL1 Input leakage current, port 0, EA, P1.6, P1.7 0.45V＜VI ＜4.7V: ±10μA; (13)IDD Power supply current:; (14)Active mode @ 16MHz1, 9 VDD=5.5V: 32.0mA; (15)Idle mode @ 16MHz2, 9: 6mA; (16)Power down mode3, 4: 50mA; (17)RRST Internal reset pull-down resistor 40: 225kΩ; (18)CIO Pin capacitance: 15pF.

Features

OM5234/FBB/536 features: (1)80C51 central processing unit; (2)6k×8 ROM; (3)256×8 RAM; (4)Two standard 16-bit timer/counters; (5)Four 8-bit I/O ports; (6)Full-duplex UART facilities; (7)Power control modes; (8)Idle mode; (9)Power-down mode; (10)ROM code protection.

Diagrams