HD74BC373A

HD74BC373A Octal D Type Transparent Latches With 3 State Outputs ADE-205-009A(Z) Rev. 1 March 1993 Description The HD74BC373A provides high drivability and operation equal to or better than high speed bipolar standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC, when the frequency is 10 MHz. The device has eight D type latches with three state outputs in a 20 pin package. When the latch enable input is high, the Q outputs will follow the D inputs. When the latch enable goes low, data at the D inputs will be retained at the outputs until latch enable returns high again. When a high logic level is applied to the output control input, all outputs go to a high impedance state, regardless of what signals are present at the other inputs and the state of the storage elements. Features Input/Output are at high impedance state when power supply is off. Built in input pull up circuit can make input pins be open, when not used. TTL level input Wide operating temperature range input pins Ta = –40 to + 85°C Function Table Inputs G H L L L H L X Z : : : : High level Low level Immaterial High impedance LE X H H L D X L H X Output Q Z L H No change HD74BC373A Pin Arrangement G 1Q 1D 2D 2Q 3Q 3D 4D 4Q GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC 8Q 8D 7D 7Q 6Q 6D 5D 5Q LE (Top view) Absolute Maximum Ratings Item Supply voltage Input diode current Input voltage Output voltage Off s...