Advanced, single-chip architecture provides
high performance, long battery life.
The heart of the TI-68 is a single,
advanced calculator integrated circuit.
Fabricated in a high-performance
silicon-gate CMOS technology that
dissipates very little power, this four-bit
microcomputer is designed specifically
for calculator applications. The highly
integrated chip contains the TI-68's
CPU and memory as well as its 540-
pixel display-driver and keyboard-
To prolong battery life without com-
promising high-performance operation,
the TI-68 chip operates in multiple
modes. In its high-speed calculating
mode the chip consumes 220
microamps; in its power-saving idle
mode the chip drives the display and
reads the keyboard for inputs but con-
sumes just 23 microamps. The calcula-
tor maintains the high contrast and
wide viewing angle of its liquid crystal
display over the life of the battery.
Texas Instruments manufactures the
TI-68 under rigid quality standards. We
test the calculator and its components
to assure reliable service that extends
far beyond the calculator's one-year
In rigorous qualification and produc-
tion tests the TI-68 has survived condi-
tions that simulate reasonably expected
use and reasonably expected abuse:
Extended-storage temperatures that
range from -40 to 70 degrees Celsius
(-40 to 158 degrees Fahrenheit).
Operating temperatures that range
from zero to 40 degrees Celsius (32 to
104 degrees Fahrenheit).
Steam-bath conditions (a tempera-
ture of 50 degrees Celsius - 122
degrees Fahrenheit - with 95 percent
Drop tests conducted from desktop
height to cause an impact on each sur-
face of the calculator.
Keystroke actuation tests (500,000
actuations per key) and more.