TIBPAL22V10C, TIBPAL22V10AC, TIBPAL22V10AM

HIGH-PERFORMANCE IMPACT

™ PROGRAMMABLE ARRAY LOGIC CIRCUITS

SRPS024 – D2943, OCTOBER 1986 – REVISED MARCH 1992

POST OFFICE BOX 655303

2

description (continued)

Further advantages can be seen in the introduction of variable product term distribution. This technique

allocates from 8 to 16 logical product terms to each output for an average of 12 product terms per output. This

variable allocation of terms allows far more complex functions to be implemented than in previously available

devices.

Circuit design is enhanced by the addition of a synchronous set and an asynchronous reset product term. These

functions are common to all registers. When the synchronous set product term is a logic 1, the output registers

are loaded with a logic 1 on the next low-to-high clock transition. When the asynchronous reset product term

is a logic 1, the output registers are loaded with a logic 0. The output logic level after set or reset depends on

the polarity selected during programming. Output registers can be preloaded to any desired state during testing.

Preloading permits full logical verification during product testing.

With features such as programmable output logic macrocells and variable product term distribution, the

TIBPAL22V10 and TIBPAL22V10A offer quick design and development of custom LSI functions with

complexities of 500 to 800 equivalent gates. Since each of the ten output pins may be individually configured

as inputs on either a temporary or permanent basis, functions requiring up to 21 inputs and a single output or

down to 12 inputs and 10 outputs are possible.

A power-up clear function is supplied that forces all registered outputs to a predetermined state after power is

applied to the device. Registered outputs selected as active-low power up with their outputs high. Registered

outputs selected as active-high power up with their outputs low.

A single security fuse is provided on each device to discourage unauthorized copying of fuse patterns. Once

blown, the verification circuitry is disabled and all other fuses will appear to be open.

The TIBPAL22V10C and TIBPAL22V10AC are characterized for operation from 0

°C to 75°C. The

TIBPAL22V10AM is characterized for operation over the full military temperature range of –55

°C to125°C.