74F544 Octal Registered Transceiver IC With Inverting Tri-State Outputs

Contents hide

1 What is a Bus Transceiver Circuit?

2 74F544 Key Features & Specifications

3 74F544 Pinout

4 Applications

5 74F544 Datasheet

The 74F544 Octal Registered Transceiver features two sets of D-Type latches for the temporary storage of data flowing in either direction. Separate Latch Enable (LEAB’, LEBA’) and Enable (OEAB’, OEBA’) inputs are provided for each register to permit independent control of inputting and outputting in either direction of data flow. The MC74F544 has an inverting data path, unlike the 74F543, which features a non-inverting data output path. The 74F544 IC has a vast array of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL, which allows it to be used in high speed, low noise applications.

What is a Bus Transceiver Circuit?

Bus transceiver circuits are simple electronic tri-state, bi-directional devices that allow the flow of data between two points, making them compatible with bus-oriented systems or the bi-directional (input or output) control of any interface circuitry. A Bus transceiver can be inverting or non-inverting, common examples are 74LS243 & LS242 IC series. They are designed for asynchronous two-way communication between two data buses or input/output devices. The transceiver allows for the transmission of data from the terminal A to terminal B and vice versa depending on the logic level at the direction-control input.

74F544 Key Features & Specifications

Technology Family: F
VCC (Min) (V): 4.5
VCC (Max) (V): 5.5
Bits (#): 8
Voltage (Nom) (V): 5
Frequency at normal voltage (Max) (MHz): 70
ICC at normal voltage (Max) (mA): 0.125
Propagation delay (Max) (ns): 8.5
IOL (Max) (mA): 64
IOH (Max) (mA): -15
Operating temperature range (C): 0 to 70
Combines 74F245 and 74F373 Type Functions in One Chip
8-Bit Octal Transceiver
Inverting Output
Back to Back Registers for Storage
Separate Controls for Data Flow in Each Direction
Glitchless Outputs During 3-State Power Up or Power Down Operation
High Impedance Outputs in Power Off State
A Outputs Sink 24 mA and Source 3.0 mA
B Outputs Sink 64 mA and Source 15 mA
ESD Protection > 4000 Volts

74F544 Pinout

Pin No.	Pin Name	Description
1	LEBA’	Active Low B to A Latch Enable Input
2	OEBA’	Active Low B to A Output Enable input
3	A0′	Active Low Data Input 0, Port A
4	A1′	Active Low Data Input 1, Port A
5	A2′	Active Low Data Input 2, Port A
6	A3′	Active Low Data Input 3, Port A
7	A4′	Active Low Data Input 4, Port A
8	A5′	Active Low Data Input 5, Port A
9	A6′	Active Low Data Input 6, Port A
10	A7′	Active Low Data Input 7, Port A
11	EAB’	Active Low A to B Enable Input
12	GND	Ground Pin
13	OEAB’	Active Low A to B Output Enable input
14	LEAB’	Active Low B to A Latch Enable Input
15	B7′	Active Low Data Input 7, Port B
16	B6′	Active Low Data Input 6, Port B
17	B5′	Active Low Data Input 5, Port B
18	B4′	Active Low Data Input 4, Port B
19	B3′	Active Low Data Input 3, Port B
20	B2′	Active Low Data Input 2, Port B
21	B1′	Active Low Data Input 1, Port B
22	B0′	Active Low Data Input 0, Port B
23	EBA’	Active Low B to A Enable Input
24	Vcc	Chip Supply Voltage

Applications

The 74F544 IC has number of different applications, a few of them are listed below:

An integral part of wireless network equipment such as RF devices & network testing kits
Also used in communication devices such as walkie-talkies & CB radios.