54AC11533, 74AC11533

OCTAL D-TYPE TRANSPARENT LATCHES

WITH 3-STATE OUTPUTS

SCAS004 - D2957, JULY 1987 - REVISED APRIL 1993

features

8-Latches in a Single Package
3-State Bus-Driving Inverting Outputs
Full Parallel Access for Loading
Buffered Control Inputs
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 8-bit 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 ´AC11533 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 ´AC11533 is functionally equivalent to the ´AC11373 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 pull-up 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 54AC11533 is characterized for operation over the full military temperature range of -55°C to 125°C. The 74AC11533 is characterized for operation from - 40°C to 85°C.