Anterwell Technology Ltd.
Anterwell Technology Ltd. Large Original stock of IC Electronics Components, Transistors, Diodes etc. High Quality, Reasonable Price, Fast Delivery.
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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; Tamb = 25 °C; tr = tf = 6 ns
| Symbol | Parameter | Conditions | Min | Typ | Max | Unit |
| Type 74HC245 | ||||||
| tPHL, tPLH | propagation delay An to Bn or Bn to An | CL = 15 pF; VCC =5V | - | 7 | - | ns |
| CI | input capacitance | - | 3.5 | - | pF | |
| CI/O | input/output capacitance | - | 10 | - | pF | |
| CPD | power dissipation capacitance per transceiver | VI = GND to VCC | [1] - | 30 | - | pF |
| Type 74HC245 | ||||||
| tPHL, tPLH | propagation delay An to Bn or Bn to An | CL = 15 pF; VCC =5V | - | 10 | - | ns |
| CI | input capacitance | - | 3.5 | - | pF | |
| CI/O | input/output capacitance | - | 10 | - | pF | |
| CPD | power dissipation capacitance per transceiver | VI = GND to VCC − 1.5 V | [1] - | 30 | - | pF |
[1] CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi × N + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑ (CL × VCC2 × fo) = sum of outputs.
4. Functional diagram
