MICROCHIP COM8116T-016P

The Standard Microsystem's COM 8116/COM8136 is an enhanced version of the COM5016/COM5036 Dual Baud Rate Generator. It is fabricated using SMC's patented COPLAMOS and CLASP technologies and employs depletion mode loads, allowing operation from a single +5V supply. The standard COM8116/COM8136 is specifically dedicated to generating the full spectrum of 16 asynchronous/ synchronous data communication frequencies for 16x UART/USRT devices. A large number of the frequencies available are also useful for 1X and 32X ASTRO/USYNRT devices. The COM8116/COM8136 features an internal crystal oscillator which may be used to provide the master reference frequency. Alternatively, an external reference may be supplied by applying complementary TTL level signals to pins 1 and 18. Parts suitable for use only with an external TTL reference are marked COM 8116T/COM 8136T. TTL outputs used to drive the COM8116/COM8136 or COM8116T/ COM 8136T XTAL/EXT inputs should not be used to drive other TTL inputs, as noise immunity may be compromised due to excessive loading. The output of the oscillator/buffer is applied to the dividers for generation of the output frequencies fT, fs. The dividers are capable of dividing by any integer from 6 to 2^+ + |, inclusive. If the divisor is even, the output will be square; otherwise the output will be high longer than it is low by one fx clock period. The reference frequency (fx) is used to provide a high frequency output at fx/4 on the COM 8136/T. Each of the two divisor ROMs contains 16 divisors, each 19 bits wide, and is fabricated using SMC's unique CLASP technology allowing up to 32 different divisors on custom parts. This process permits reduction of turn-around time for RoM patterns. Each group of four divisor select bits is held in an externally strobed data latch. The strobe input is level sensitive: while the strobe is high, data is passed directly through to the ROM. Initiation of a new frequency is effected within 3.5μs of a change in any of the four divisor select bits (strobe activity is not required). The divisor select inputs have pull-up resistors; the strobe inputs do not.

• Onchip crystal oscillator or external frequency input
• Single +5V power supply
• Choice of 2 × 16 output frequencies
• 16 asynchronous/synchronous baud rates
• Direct UART/USRT/ASTRO/USYNRT compatibility
• Full duplex communication capability
• High frequency reference output
• Re-programmable ROM via CLASP technology allows generation of other frequencies
• TTL, MOS compatibility
• Compatible with COM5016/COM5036