74LS85 4-Bit Magnitude Comparator IC (7485 IC) DIP-16 Package

The 74HC163; 74HCT163 is a synchronous presettable binary counter with an internal look-head carry. Synchronous operation is provided by having all flip-flops clocked simultaneously on the positive-going edge of the clock (CP). The outputs (Q0 to Q3) of the counters may be preset to a HIGH or LOW. A LOW at the parallel enable input (PE) disables the counting action. It causes the data at the data inputs (D0 to D3) to be loaded into the counter on the positive-going edge of the clock. Preset takes place regardless of the levels at count enable inputs (CEP and CET). A LOW at the master reset input (MR) sets Q0 to Q3 LOW after the next positive-going transition on the clock input (CP). This action occurs regardless of the levels at input pins PE, CET and CEP. This synchronous reset feature enables the designer to modify the maximum count with only one external NAND gate. The look-ahead carry simplifies serial cascading of the counters. Both CEP and CET must be HIGH to count. The CET input is fed forward to enable the terminal count output (TC). The TC output thus enabled will produce a HIGH output pulse of a duration approximately equal to a HIGH output of Q0. This pulse can be used to enable the next cascaded stage. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC

Features :-

• Complies with JEDEC standard no. 7A
• Input levels:

For 74HC163: CMOS level For 74HCT163: TTL level

• Synchronous counting and loading
• 2 count enable inputs for n-bit cascading
• Synchronous reset
• Positive-edge triggered clock
• ESD protection:

HBM JESD22-A114F exceeds 2 000 V MM JESD22-A115-A exceeds 200 V

• Multiple package options
• Specified from -40 °C to +85 °C and -40 °C to +125 °C

The 74F240 are octal buffers and line drivers designed to be employed as memory and address drivers, clock drivers and bus-oriented transmitters/receivers which provide improved PC and board density.

Features:-

• 3-STATE outputs drive bus lines or buffer memory address registers
• Outputs sink 64mA (48mA mil)
• 12mA source current
• Input clamp diodes limit high-speed termination effects

The 74F533 consists of eight latches with 3-STATE outputs for   bus   organized   system   applications.   The   flip-flops appear transparent to the data when Latch Enable (LE) is HIGH.  When  LE  is  LOW,  the  data  that  meets  the  setup times is latched. Data appears on the bus when the Output Enable (OE) is LOW. When OE is HIGH the bus output is in the high impedance state.

Features :-

• Eight latches in a single package
• 3-STATE outputs for bus interfacing

This device contains gates configured to perform a 4-2-3-2input AND-OR-INVERT function.