SN74BCT298468-BIT BUS-INTERFACE D-TYPE LATCHWITH3-STATE OUTPUTS
SCBS023C - MARCH 1989 - REVISED APRIL 1994
features
- BiCMOS Process With CMOS Inputs and TTL Outputs Substantially Reduces Standby Current
- Input Has 50-
Pullup Resister - Bus-Structured Pinout
- Functionally Equivalent to SN74ALS29846 and AMD Am29846
- Provides Extra Data Width Necessary For Wider Address/Data Paths or Buses With Parity
- Power-Up High-Impedance State
- Buffered Control Inputs to Reduce DC Loading Effects
- Packaged in Standard Plastic 300-mil DIP (NT)
description
The SN74BCT29846 features 3-state outputs designed specificallyfor driving highly capacitive or relatively low-impedance loads. Itis particularly suitable for implementing buffer registers, I/Oports, bidirectional bus drivers, and working registers.
The eight latches of the SN74BCT29846 are transparent D-typelatches. The SN74BCT29846 has inverting data (D\) inputs. Since clear(
) and preset(
) areindependent of the clock, taking the input low will cause the eight Q outputs to go low.Taking the input low willcause the eight Q outputs to go high. When both and are taken low, the outputs willfollow the preset condition.
The buffered output-enable (
, 
, and ) inputs can be used to place theeight outputs in either a normal logic state (high or low levels) ora high-impedance state. The outputs are also in the high-impedancestate during power-up and power-down conditions. The outputs remainin the high-impedance state while the device is powered-down. In thehigh-impedance state, the outputs neither load nor drive the buslines significantly. The high-impedance state and increased driveprovide the capability to drive the bus lines in a bus-organizedsystem without need for interface or pull-up components. The outputenables do not affect the internal operation of the latches. Old datacan be retained or new data can be entered while the outputs are inthe high-impedance state.
The SN74BCT29846 is characterized for operation from 0°C to70°C.
Title: 8-BIT BUS-INTERFACE D-TYPE LATCH WITH 3-STATE OUTPUTS
Product Family: D-TYPE (3-STATE) LATCHES
Device Functionality: OCTAL BUS INTERFACE D-TYPE LATCHES
Orderable Devices: SN74BCT29846NT
View the complete PDF datasheet: scbs023c.pdf (79 K Bytes) (Requires Acrobat Reader 3.x)View more information about generic part numbers:SN74BCT29846
Go to the Engineering Design Center to locate information on other TI Semiconductor devices.
(c) Copyright 1998 Texas Instruments Incorporated. All rights reserved.
Trademarks, Important Notice!