DM74ALS652NT

Number of Channels per Chip : 8
Output Type : 3-State
Maximum Operating Temperature : + 70 C
Packaging : Tube
Supply Voltage - Max : 5.5 V
Low Level Output Current : 24 mA
Supply Voltage - Min : 4.5 V
Logic Type : Bipolar
Logic Family : 74ALS
Input Level : TTL
Output Level : TTL
High Level Output Current : - 15 mA
Package / Case : PDIP-24
Propagation Delay Time : 30 ns


Features:

· Switching specifications at 50 pF
· Switching specifications guaranteed over full temperature and VCC range
· Advanced oxide-isolated, ion-implanted Schottky TTL process
· 3-STATE buffer-type outputs drive bus lines directly
· Independent registers and enables for A and B buses
· Multiplexed real-time and stored data


Pinout

Specifications

Supply Voltage.......................................................... 7V
Input Voltage
Control Inputs ...........................................................7V
I/O Ports .................................................................5.5V
Operating Free-Air Temperature Range ....0°C to +70°C
Storage Temperature Range ..............−65°C to +150°C
Typical JA
N Package ......................................................44.5°C/W
M Package ......................................................80.5°C/W
Note 3: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define the conditions
for actual device operation.


Description

This DM74ALS652NT device incorporates an octal transceiver and an octal D-type register configured to enable transmission of data from bus to bus or internal register to bus.

This DM74ALS652NT bus transceiver features totem-pole 3-STATE outputs designed specifically for driving highly-capacitive or relativelylow-impedance loads. The high-impedance state and increased high level logic drive provide this DM74ALS652NT device with the capability of being connected directly to and driving the bus lines in a bus organized system without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The registers in the DM74ALS652 are edge-triggered D-type flip-flops. On the positive transition of the clock (CAB or CBA), the input data is stored into the appropriate register. The CAB input controls the transfer of data into the A register and the CBA input controls the B register.

The SAB and SBA control pins are provided to selectwhether real-time data or stored data is transferred. A LOW input level selects real-time data and a HIGH level selects stored data. The select controls have a "make before break" configuration to eliminate a glitch which would normally occur in a typical multiplexer during the transition between stored and real-time data.

The enable (GAB and GBA) control pinsof DM74ALS652NT  provide four modes of operation: real-time data transfer from bus A to B, real-time data transfer from bus B to A, real-time bus A and/or B data transfer to internal storage, or internal stored data transfer to bus A and/or B.

Parameters:

Technical/Catalog Information	DM74ALS652NT
Vendor	Fairchild Semiconductor
Category	Integrated Circuits (ICs)
Number of Drivers/Receivers	8/8
Type	Transceiver
Voltage - Supply	3.3V
Package / Case	24-DIP
Packaging	Tube
Protocol	-
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	DM74ALS652NT DM74ALS652NT