1. General description

The 74HC245; 74HCT245 is a high-speed Si-gate CMOS device and is pin compatible with Low-Power Schottky TTL (LSTTL).

The 74HC245; 74HCT245 is an octal transceiver featuring non-inverting 3-state bus compatible outputs in both send and receive directions. The 74HC245; 74HCT245 features an output enable input (OE) for easy cascading and a send/receive input (DIR) for direction control. OE controls the outputs so that the buses are effectively isolated.

The 74HC245; 74HCT245 is similar to the 74HC640; 74HCT640 but has true (non-inverting) outputs.

2. Features

■ Octal bidirectional bus interface

■ Non-inverting 3-state outputs

■ Multiple package options

■ Complies with JEDEC standard no. 7A

■ ESD protection:

   ◆ HBM EIA/JESD22-A114-B exceeds 2000 V

   ◆ MM EIA/JESD22-A115-A exceeds 200 V

■ Specified from −40 °C to +85 °C and from −40 °C to +125 °C

3. Quick reference data

GND = 0 V; T_amb = 25 °C; t_r = t_f = 6 ns

[1] C_PD is used to determine the dynamic power dissipation (P_D in µW):

P_D = C_PD × V_CC² × f_i × N + ∑ (CL × V_CC² × fo) where:

f_i = input frequency in MHz;

f_o = output frequency in MHz;

C_L = output load capacitance in pF;

V_CC = supply voltage in V;

N = number of inputs switching;

∑ (C_L × V_CC² × f_o) = sum of outputs.

4. Functional diagram