Specification	SN74ALS990DW

Circuit [custom]	8
Circuit [custom]	8
Current - Output High, Low [custom]	400 µA
Current - Output High, Low [custom]	8 mA
Delay Time - Propagation	6 ns
Independent Circuits	1
Logic Type	D-Type Transparent Latch
Mounting Type	Surface Mount
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output Type	Tri-State
Package / Case	20-SOIC
Package / Case [y]	0.295 in
Package / Case [y]	7.5 mm
Supplier Device Package	20-SOIC
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	4.5 V

SN74ALS990 Series

Octal D-Type Transparent Read-Back Latches

Part	Supplier Device Package	Delay Time - Propagation	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Voltage - Supply [Min]	Voltage - Supply [Max]	Independent Circuits	Mounting Type	Operating Temperature [Max]	Package / Case	Package / Case [y]	Package / Case [y]	Logic Type	Circuit [custom]	Circuit [custom]	Output Type	Package / Case	Package / Case
Texas Instruments SN74ALS990DW	20-SOIC	6 ns	400 µA	8 mA	4.5 V	5.5 V	1	Surface Mount	70 °C	20-SOIC	0.295 in	7.5 mm	D-Type Transparent Latch	8	8	Tri-State
Texas Instruments SN74ALS990N	20-PDIP	6 ns	400 µA	8 mA	4.5 V	5.5 V	1	Through Hole	70 °C	20-DIP			D-Type Transparent Latch	8	8	Tri-State	7.62 mm	0.3 in
Texas Instruments SN74ALS990DWR	20-SOIC	6 ns	400 µA	8 mA	4.5 V	5.5 V	1	Surface Mount	70 °C	20-SOIC	0.295 in	7.5 mm	D-Type Transparent Latch	8	8	Tri-State
Texas Instruments SN74ALS990NG4	20-PDIP	6 ns	400 µA	8 mA	4.5 V	5.5 V	1	Through Hole	70 °C	20-DIP			D-Type Transparent Latch	8	8	Tri-State	7.62 mm	0.3 in

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Texas Instruments	TUBE	1	$ 8.89
		100	$ 7.77
		250	$ 5.99
		1000	$ 5.36

Description

General part information

SN74ALS990 Series

This 8-bit latch is designed specifically for storing the contents of the input data bus and providing the capability of reading back the stored data onto the input data bus.

The eight latches are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs.

Read back is provided through the output-enable () input. Whenis taken low, the data present at the output of the data latches is allowed to pass back onto the input data bus. Whenis taken high, the output of the data latches is isolated from the D inputs.does not affect the internal operation of the latches; however, precautions should be taken not to create a bus conflict.

Documents

Technical documentation and resources

8-Bit D-Type Transparent Read-Back Latch datasheet (Rev. B)

Data sheet

Digital Logic Data Book

Logic Guide

Datasheet