TK87C749 Microcontroller
General Description
Based on the TK80C51, the TK87C749 is economically priced and comes in a small package size. Tekmos uses high-density CMOS technology to construct the TK87C749 Microcontroller, decreasing CMOS latch-up sensitivity through epitaxial substrate.
The TK87C749 contains a 64k x 8 Flash, a 256 x 8 RAM, 21 I/O lines, a 16-bit auto-reload counter/timer, a fixed-priority level interrupt structure, an on-chip oscillator, a five channel multiplexed 8-bit A/D converter, and an 8-bit PWM output. Additionally, the device comes with two power-reduction modes: idle and power down.
The TK87C749 is a derivative of the 8051 microcontroller architecture. With 64Kx8 of Flash ROM, and 128x8 of scratchpad RAM, this part is a pin-for-pin replacement of the NXP 87C749 microcontroller.
The TK87C749 is intended to provide the 80C51 architecture in a small package and with both an 8-bit ADC and an 8-bit PWM capability.
To achieve this, port P2, and 3 bits of port P0 were removed, along with the external bus control pins. This allows the TK87C751 to fit within either a 28 pin, 300 mil PDIP package, or a 28 pin PLCC package.
The ability of the design to access external program and data memory was also removed, along with the PSEN, ALE, and EA pins.
Because the TK87C749 utilizes a Flash ROM, it may be re-programmed if required. The original part was a One-Time-Programmable (OTP) part.
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Minimum Order Quantity
We will continue to sell the TK87C749 parts with a MOQ of 100 units as long as we have inventory in stock. Once that inventory is gone, then minimum order quantities will increase to 5000 parts per order.
Documentation
Product Change Notice Form: PCN 18007
Product Change Notice Form: PCN 18008
Package Outline Drawing: LGA 28pin Package Outline Drawing
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Main Office
Tekmos, Inc.
14121 Highway 290 West
Building #15
Austin, TX 78737
Phone: (512) 342-9871
