54ACT11533, 74ACT11533

OCTAL D-TYPE TRANSPARENT LATCHES

WITH 3-STATE OUTPUTS

SCAS017A - D2957, JULY 1987 - REVISED APRIL 1993

Copyright © 1992, Texas Instruments Incorporated

features

• Eight Latches in a Single Package
• 3-State Bus-Driving Inverting Outputs
• Full Parallel Access for Loading
• Buffered Control Inputs
• Inputs Are TTL-Voltage Compatible
• Flow-Through Architecture Optimizes
  PCB Layout
• Center-Pin V_CC and GND Configurations Minimize High-Speed Switching Noise
• EPIC^TM (Enhanced-Performance Implanted CMOS) 1-m Process
• 500-mA Typical Latch-Up Immunity at 125°C
• Package Options Include Plastic Small- Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs

  EPIC is a trademark of Texas Instruments Incorporated.

description

These eight latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight latches of the ´ACT11533 are transparent D-type latches. While the enable (C) is high, the Q\ outputs will follow the complements of the (D) inputs. When the output control is taken low, the Q\ outputs will be latched. The ´ACT11533 is functionally equivalent to the ´ACT11373 except for having inverted outputs.

A buffered output-control input can be used to place the eight outputs in either a normal
logic state (high or low logic levels) or a high-
impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance third state and increased drive provide the capability to drive the bus lines in a bus-organized system without need for interface or pullup components.

The output control does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are off.

The 54ACT11533 is characterized for operation over the full military temperature range of -55°C to 125°C. The 74ACT11533 is characterized for operation from - 40°C to 85°C.